The mechanical energy can be calculated by the sum of the kinetic energy and the potential energies, θ = 9.8º
here, the case that there is no friction, this energy is constant
The kinetic energy is: K = ½ m v²
The potential energy is: U = m g (y-y₀)
The mechanical energy is Em = K + U
Where we know,
m is mass
v is linear velocity
g is the acceleration of gravity
y height.
The formula for simple harmonics motion for small angles -
θ = θ₀ cos (wt + Ф)
here,
θ is the angle of motion
w is the angular velocity
t time
Ф a phase constant
This indicate the system that has a length of
l = 1.0 m
which is released at the angle of θ₀ = 20º (π rad / 180º) = 0.349 rad
Velocity is defined by the change in position or angles with respect to time.
w = -θ₀ w sin (wt + Ф)
we know, initial movement for
time t = 0 the velocity = 0
0 = - θ₀ w sin Ф
The angular velocity is given as
w² = g / l ( g = 9.8)
w = 3.13 rad/sec
Expression for the energies
K = ½ m v²
Linear and angular variables are related.
v = w l
calculations,
K = ½ m l² w²
the expression for the angular velocity.
K = ½ m l² ( -θ₀ w sin wt) ²
for the potential energy, where we make the initial height = 0
U = m g θ₀ cos wt
kinetic energy = potential energy
K = U
½ m l² θ₀² w² sin² wt = m g θ₀ cos wt
when we solve this, we get
θ = wt
when we calculate,
sin² θ = 29.8/ 1^20.3493.13^2
sin² θ = 5.73 cos θ
The solution of
θ' = 1.4 + 2π n n= 0, 1, 2, ...
First occurs for n = 0
θ = 1.40 rad = 80.2º
angle measured from vertical components-
θ = 90- 8.02
θ = 9.8º
we can say, by taking in account of definition of energy and simple harmonics motion, we can find the results for point at which KE and PE is equal.
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HElPEpkapek he i jhofhe
50pts!
The average density of an object is 0.46 kg/m3. Which of these images is correct after the object is placed in olive oil with a density of 0.92 kg/m3?
Will the cube sink?
Will the cube float?
Will the cube be suspended?
I have no clue, but maybe you do
Answer:
Yes, No, No
Explanation:
Which skill involves the ability to change and control the direction or position of the body while keeping the motion quick and constant?
Question 1 options:
agility
balance
speed
power
Question 2 (1 point)
Li Qiu wants to trace the path of adrenaline as it sends a message that causes the heart to beat faster, beginning with the first step in the process and ending with the last. Where should Li Qiu start and where should he end?
Question 2 options:
heart beats faster; gland produces adrenaline
adrenaline carries message; heart beats faster
gland produces adrenaline; adrenaline carries message
gland produces adrenaline; heart beats faster
Question 3 (1 point)
Saved
Which type of contraction involves muscles lengthening as they strengthen?
Question 3 options:
concentric
eccentric
isometric
shortening
Question 4 (1 point)
Which action helps you warm up before you begin exercising?
Question 4 options:
Walk around at a normal pace.
Kick your legs back and forth.
Swing your arms gently back and forth.
Open your chest by reaching your arms behind you.
Question 5 (1 point)
Eva takes a bite of a taco, chews, and then swallows. As the food travels down her esophagus, what muscles are working?
Question 5 options:
agile
skeletal
smooth
secondary
Question 6 (1 point)
What word describes the muscles that support your hollow organs?
Question 6 options:
active
thick
smooth
rough
Question 7 (1 point)
Muscle physiology is a field of study. If someone is studying muscle physiology, what are they MOST interested in learning?
Question 7 options:
the composition of cells
how muscles work
the position of tissues
how the body uses fat
Question 8 (1 point)
Lisa is getting older and wants to always have a good memory. Lisa exercises on a regular basis as she knows that this increases the body's oxygen, energy, and waste removal. What is the BEST benefit of staying fit in terms of Lisa's memory?
Question 8 options:
Staying fit removes old brain cells.
Staying fit creates new brain cells.
Staying fit returns brain cells to the blood.
Staying fit releases brain cells into pathways.
Question 9 (1 point)
When you walk, pick something up, or sit down, which muscles do you use?
Question 9 options:
skeletal
cardiac
smooth
supportive
Question 10 (1 point)
Hiro used to have to think about every movement when he was first learning to dance. Now all the movements come naturally to him, and he doesn't need to think about them. What has learning to dance built up in Hiro's body?
Question 10 options:
metabolic connections
hormones
neuron pathways
glands
Question 11 (1 point)
What is the act of muscles tightening and shrinking?
Question 11 options:
eccentric
isometric
contraction
elongation
Question 12 (1 point)
Christine's grandfather has a heart attack that damages the muscle in the walls of his heart. What muscles did the heart attack harm?
Question 12 options:
skeletal
concentric
cardiac
smooth
Question 13 (1 point)
Pedro's cousin has a disorder that causes his body to grow too fast. This is MOST likely which type of disorder?
Question 13 options:
endocrine
cardiac
eccentric
nervous
Question 14 (1 point)
When you tighten your fist, what does it do?
Question 14 options:
loosen
extend
contract
release
Question 15 (1 point)
Faith has begun exercising and eating light and brain-healthy foods. Lately, she has been feeling better rested, and it seems as though she can think about and work through problems better than before. What MOST likely explains these changes?
Question 15 options:
Faith's nervous system has eliminated pathways of neurons.
Faith's new habits have lowered her reliance on hormones.
Faith's brain has been released from managing basic physical functions.
Faith's metabolism is working at a higher level.
The answers include the following:
The skill which involves the ability to change and control the direction or position of the body while keeping the motion quick and constant is agility and is denoted as option A.The place where Li Qiu should start and where he should end is gland produces adrenaline; heart beats faster.The type of contraction which involves muscles lengthening as they strengthen is eccentric.The action which helps you warm up before you begin exercising is walking around at a normal pace.As the food travels down her esophagus, smooth muscles are working.The word which describes the muscles that support your hollow organs is smooth.Muscle physiology is a field of study which involves learning how muscles workThe best benefit of staying fit in terms of Lisa's memory is that staying fit creates new brain cells.When you walk, pick something up, or sit down, the skeletal muscles are used. Learning to dance has built up metabolic connections in Hiro's body. The act of muscles tightening and shrinking is contraction.The cardiac muscles is where the heart attack harmed.A growth disorder is most likely as a result of endocrine disorder.When you tighten your fist, it extends.Faith's metabolism is working at a higher level which is why there are changes such as feeling better rested.What is Cardiac muscle?This is referred to as the muscle of the heart and it is involved in pumping of blood to different parts of the body.
In the case of a heart attack, this type of muscle is affected which leads to reduction in the distribution of blood.
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Answer:
Explanation:The answers include the following:
The skill which involves the ability to change and control the direction or position of the body while keeping the motion quick and constant is agility and is denoted as option A.
The place where Li Qiu should start and where he should end is gland produces adrenaline; heart beats faster.
The type of contraction which involves muscles lengthening as they strengthen is eccentric.
The action which helps you warm up before you begin exercising is walking around at a normal pace.
As the food travels down her esophagus, smooth muscles are working.
The word which describes the muscles that support your hollow organs is smooth.
Muscle physiology is a field of study which involves learning how muscles work
The best benefit of staying fit in terms of Lisa's memory is that staying fit creates new brain cells.
When you walk, pick something up, or sit down, the skeletal muscles are used.
Learning to dance has built up metabolic connections in Hiro's body.
The act of muscles tightening and shrinking is contraction.
The cardiac muscles is where the heart attack harmed.
A growth disorder is most likely as a result of endocrine disorder.
When you tighten your fist, it extends.
Faith's metabolism is working at a higher level which is why there are changes such as feeling better rested.
What is Cardiac muscle?
This is referred to as the muscle of the heart and it is involved in pumping of blood to different parts of the body.
In the case of a heart attack, this type of muscle is affected which leads to reduction in the distribution of blood.
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a swimmer swims three laps across a 50m swimming pool. Two of the laps are in one direction and the other is in the opposite direction. What is the swimmers total displacement
Answer:
150m = total displacement
Explanation:
50*3=150m
how many turns of wire would be required to make a 120 mhmh inductance out of a 33.0 cmcm -long air-filled coil with a diameter of 4.1 cmcm ? express your answer using two significant figures.
No. of turns of wire would be required to make a 120 mh inductance out of a 33.0 cm -long air-filled coil with a diameter of 4.1 cm is μ*2740.68 as μ is variable for different types of material.
What is Inductance?An electrical conductor's propensity to resist a change in the flow of current through it is known as inductance. A magnetic field is produced around a conductor by an electric current flowing through it. The magnitude of the current determines the field strength, which follows any changes in current.
The formula of Inductance is L = μN2A/l where L = Inductance (H), μ = Permeability (Wb/Am),N = The coil's number of turns, A = The coil's cross sectional area = π*d²/4, l = Length of coil (m)
Now acc. to the given data
L=120mh
I=33.0cm =0.33m
Diameter=4.1cm
A= π*d²/4 = 3.14*4.12/4
A=13.19cm2or 0.001319m2
Now rearranging the formula for no. of turns we get
N=√LI/μA
So, N=√ 120*0.33/μ*0.001319
N=μ*2740.68
Hence, no. of turns of wire would be required to make a 120 mh inductance out of a 33.0 cm -long air-filled coil with a diameter of 4.1 cm is μ*2740.68 as μ is variable for different types of material.
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For 20 minutes, Elena drove her tractor at a constant velocity across a field. In one-quarter of this time, her tractor traveled 280 meters. What was the tractor's velocity?
The relative ability of a bonded atom to attract shared electron pairs is called its _____. This ability _____ as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
The relative ability of a bonded atom to attract shared electron pairs is called its electronegativity. This ability increases as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
The electronegativity of an atom is a measure of how strongly it attracts electrons to itself. The higher the electronegativity of an atom, the more it will pull electrons away from other atoms.The electronegativity of an atom increases as the size of the atom decreases. This is because the electrons are closer to the nucleus in a smaller atom, and the nucleus has a greater pull on the electrons.
The electronegativity of an atom also depends on the number of protons in the nucleus. The more protons an atom has, the greater the electronegativity. Electronegativity is an important property in determining the chemical properties of atoms and molecules. Atoms with high electronegativities will tend to form bonds with other atoms that have low electronegativities. This is because the high electronegativity atom will pull the electrons away from the other atom, making the bond between the two atoms stronger.
The electronegativity of an atom is determined by the ability of the atom to attract electrons to itself. The higher the electronegativity of an atom, the more it will pull electrons away from other atoms.The size of an atom plays a role in its electronegativity. Smaller atoms have a higher electronegativity than larger atoms because the electrons are closer to the nucleus. This means that the smaller atom can more easily pull electrons away from the larger atom.
The trend in electronegativity is that it increases as you go from left to right across the periodic table. This is because the atoms get smaller as you go from left to right. The smaller atoms have a higher electronegativity than the larger atoms.The trend in electronegativity is also that it increases as you go from bottom to top of the periodic table. This is because the atoms get closer to the nucleus as you go from bottom to top.
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Example2: A stone is pushed from the roof of a 60-m tall tower. Its
initial velocity towards the ground was 5m. What is the
S
stone's position from the ground after:
a) .5 seconds
b) 1.0 seconds
c) 1.5 seconds
d) 2.0 seconds?
stone's position from the ground after:
a) .5 seconds is 56.275 m.
b) 1.0 seconds is 50.1 m.
c) 1.5 seconds is 45.475 m.
d) 2.0 seconds is 30.4 m.
Given parameters:
Height of the tower; h₀ = 60 m.
Initial velocity, u = 5 m/s.
We know that,
acceleration due to gravity, g = 9.8 m/s².
applied formula is :
h = h₀ - ( ut + 1/2gt²)
a)So, stone's position from the ground after:
.5 seconds:
h = h₀ - ( ut + 1/2gt²)
= 60m - ( 5*0.5 + 1/2*9.8*0.5²) m
= 56.275 m.
b)So, stone's position from the ground after:
1.0 seconds:
h = h₀ - ( ut + 1/2gt²)
= 60m - ( 5*1.0 + 1/2*9.8*1.0²) m
= 50.1 m.
c)So, stone's position from the ground after:
1.5 seconds:
h = h₀ - ( ut + 1/2gt²)
= 60m - ( 5*1.5 + 1/2*9.8*1.5²) m
= 45.475 m.
d)So, stone's position from the ground after:
2.0 seconds:
h = h₀ - ( ut + 1/2gt²)
= 60m - ( 5*2.0 + 1/2*9.8*2.0²) m
= 30.4 m.
Hence, different position of the stone in different time is calculated.
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A string is used to pull a wooden block across the floor without accelerating the block. The string makes an angle to the horizontal as shown below
Does the force applied via the string do work on the block?
Answer: Yes
Explanation: The block moves a distance d under the influence of the force, so work is done by the force. Note that since the object is not accelerating, there is another force present, most likely friction.
b.
a carnot heat engine operates between a source at 1000 k and a sink at 300 k. if the heat engine is supplied with heat at a rate of 800 kj/min, determine (a) the thermal efficiency and (b) the power output of this heat engine. answers: (a) 70 percent, (b) 9.33 kw
The heat engine thermal efficiency is 70%, at which the engine has 9.33 kW of Power output.
What is heat engine?A heat engine refers to a device that converts heat into work. It absorbs heat from a tank, performs tasks such as moving a piston or lifting a weight, and finally releases thermal energy into a sink. So a heat engine can be defined as: A machine that converts the chemical energy of fuel into thermal energy used for useful work. Heat engines are classified into two types: Internal combustion engine and internal combustion engine. A heat engine can be defined as a device that converts heat energy into work.Thermal energy comes from the temperature difference provided by hot and cold reservoirs. Heat engines exploit this difference in their thermodynamic cycles.To learn more about heat engine from the given link :
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An immersion heater is placed into 1 kg of water which is at a temperature of 25 °C. the temperature of the water rise to 100 °C in 315 s and the water starts to boil.
a) find the power of the heater,
b) how long will it take to boil all the water?
[Specific heat capacity of water = 4.2 x 103 Jkg-¹ C-¹/ specific latent heat of vaporization of water = 2.26 x 106 Jkg ¹]
10^3 watt is the power of the heater,
power=work done/time
work done= mcΔt
m=1 kg
c=4.2 x 103 Jkg-¹ C-¹
Δt=75°C
work done= mcΔt
work done=1 x 4.2 x 10^3x 75
work done=3.15x10^5 joule
power=work done/time
power=3.15x10^5 joule/315 s
power= 10^3 watt
power is produced when a force causes a displacement. There is no connection between power and the amount of time this force takes to cause a displacement. The process's speed might range from being finished quickly to taking some time. For example, it takes an abnormally long time for a rock climber to elevate her body a few meters over the cliff's edge. A trail hiker, on the other hand, may swiftly lift her body a few meters if she selects the faster path up the mountain. Even though the two people put in the same amount of power , the hiker finishes the assignment far faster than the rock climber.
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you are sitting (mass 70 kg) on a sled at the top of a hill 2 m high. assume the snow is frictionless, but someone has plowed the flat bit yielding a coefficient of kinetic friction of 0.2. how fast do you need to go to just crest the next 10 m high hill?
The velocity should be 12.6 m/s to just crest the next hill.
What is law of conservation of energy?The law of conservation of energy states that energy is neither created nor destroyed, and can only be converted from one form of energy to another. This is the principle that states that certain physical properties (that is, measurable quantities) do not change over time within an isolated physical system.
By law of conservation of energy:
¹/₂ mv₁² = mgh₂ + μmg - mgh₁
¹/₂ mv₁² = mg(h₂ - h₁ + μ)
v₁² = 2g(h₂ - h₁ + μ)
v₁² = 2×9.8 (10 - 2 + 0.1)
v₁² = 158.76 m/s
v₁ = 12.6 m/s
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A student is subjected to a reaction force of 10 n northward from a 5 kg block while pushing the block over a smooth, level surface. Ignoring friction, what is the acceleration of the block?.
Ignoring the Friction, the Acceleration of the block would be 2 [tex]ms^{-2}[/tex].
The relation of force with mass and acceleration is given by :
Force = Mass * Acceleration
Here the Force is 10N and the mass of the block is 5 Kg so substituting the values in the formula we get
Acceleration = [tex]\frac{Force}{Mass}[/tex] = [tex]\frac{10}{5}[/tex] = 2 [tex]ms^{-2}[/tex] .
What is force-
According to physics. A force can cause an object with mass to accelerate when it changes its velocity, for as when it moves away from rest. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction. It is calculated using the newton SI unit (N). Force is denoted by the letter F. (formerly P).
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if the mass of the person's head is 4.8 kg , what is the magnitude of the force? express your answer using appropriate units.
The calculated magnitude of force is 47.04 N. Second Law of Motion by Newton (Force) An object's acceleration is determined by its mass and the force being applied.
All objects on Earth experience weight, or a gravitational pull that is proportionate to their mass and is imposed by the planet's mass. The acceleration that gravity gives to objects falling freely serves as a gauge of its strength. The acceleration of gravity at Earth's surface is approximately 9.8 meters (32 feet) per second every second. The magnitudes of the object's weight and the normal force are equal when the object is resting on a horizontal surface and there are no other vertically acting forces; that is, Therefore, the normal force in this case is 26 N, which is much greater than the box's weight.
F=ma
F= 4.8 * 9.8
=47.04 N
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A student claims that the data show that the magnitude of the force of air resistance is proportional to the speed of the object, within experimental uncertainty. Use physics principles to explain whether the claim is correct.
The student's claim that the magnitude of the force of air resistance is proportional to the speed of the object is true because an increase in downward force results in an equal and opposite increase in upward force or air resistance.
What is the force of resistance acting on an object?The force of air resistance acting on a moving object is known as friction.
An increase in the velocity of an object with time is known as acceleration.
The force on a body is directly proportional to the acceleration of the body. This means that force increases with an increase in acceleration.
According to Newton's third law of motion, force and reaction are equal and opposite.
Hence an increase in the downward force of a falling body results in an increase in air resistance.
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a ladder leans against a frictionless wall. the coefficient of static friction between the ladder and the ground is 0.3. to avoid slipping of the ladder, find the maximum angle in degrees between the ladder and the wall.
The maximum angle in degrees between the ladder and the frictionless wall if the coefficient of static friction between the ladder and the ground is 0.3 is 59.1°
Forces in vertical direction,
Fy = m g
Forces in horizontal direction,
Fx = μ m g
Moment at bottom of the ladder,
Fx L sin θ - Fy L cos θ / 2 = 0
μ m g L sin θ - m g L cos θ / 2 = 0
tan θ = 1 / 2 μ
tan θ = 1 / ( 2 * 0.3 )
tan θ = 1 / 0.6
tan θ = 1.67
θ = 59.1°
Static friction is the frictional force of an object at rest. Once the object exceeds this force the object starts to move. The object will then have kinetic friction which resists its motion.
Therefore, the maximum angle between the ladder and the wall is 59.1°
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consider what happens to the two spoons. choose the terms that correctly complete the sentences. the metal in the spoon is an excellent conductor , which means that it choose... heat well. on the other hand, wood is an excellent choose... , which means that it easily choose... heat.
The metal in the spoon is an excellent conductor is correct sentences.
Conductors are the elements or materials that allow electricity to pass through them. They conduct electricity because they allow for simple electron passage between atoms inside of them. Conductors also allow heat or light to be transferred between sources. People, the earth, metals, and living things are all examples of conductors. We occasionally get electric shocks as a result. Additionally an excellent conductor of electricity is the human body. Therefore, it provides an unimpeded conduit for the electricity to travel from wire to body.
Conductors are made easy for current to pass through by the presence of free electrons on their surface. The capacity of conductors to carry electricity is based on this.
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a beam of electrons is sent horizontally down the axis of a tube to strike a fluorescent screen at the end of the tube. on the way, the electrons encounter a magnetic field directed vertically downward. the spot on the screen will therefore be deflected:
As a result, when seen from the electron source, the spot on the screen will be deflected to the right.
What does the electron source in the electron microscope mean?The scanning electron microscope ( sem (TEM), the first type of electron microscope, produces images of the specimen by illuminating it with a high voltage electron beam. An electron gun is used to create the electron beam; typically, the electron source is a tungsten filament cathode.
On what basis do you produce electrons?Both high-energy collisions, such as those that occur when cosmic rays penetrate the atmosphere, and the beta decay or radioactive isotopes can produce electrons. The name "positron" refers to the electron's antiparticle, which is essentially the same as the electron with the exception that it has electrical charge that is in the opposite direction.
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You have two windla named X and Y. Windla X drum diameter i 50cm and windla Y drum diameter i 75cm. Both are hoiting a 50kg weght
X will lift faster and easier than Y because of X lift with maximum speed with minimum energy consumption.
First we have to find from that we get to know that which windlass will lift faster,
For windlass X,
Torque(X)=weight x radius of drum
=50x9.81x0.25=122.625 Nm
Torque (Y)=weight x radius of drum
=50x9.81x0.375=183.93 Nm
As we know that,
Equation of Power= Torque x Angular velocity
And Angular velocity (w)= 2 x pi x N/60
Therefore Torque is inversely proportional to speed. Thus, when speed of the car is increasing , decreaseing of torque will start.According to above sentence ,windlass X have maximum speed of lift and windlass Y have comparatively low speed.Also power is directly proportional to Torque, so maximum torque used maximum energy and vice versa.
Therefore X lift with maximum speed with minimum energy consumption.
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compare the conditions that led to the formation of the inner planets with those that led to the formation of the outer planets.
The process of formation of the inner planets, namely from a collection of solid objects, gas, and dust that are joined in a heavy mass. During the initial process of forming a gas disc, a number of dust, gas, and other surrounding material fly in the same mass line and surround the sun like a belt.
The process of forming the outer planets is from the cooling process of several clumps that also orbit, continue to spin, and pull the sky material around them in the form of gas, dust and solid objects with their own gravity then solidify and become planets.
The Solar System is a collection of celestial bodies consisting of a star called the Sun and all objects bound by its gravitational force. The Sun is the center of the solar system. The sun is a star that is closest to the earth. Like other stars, the Sun is a hot object composed of various high-pressure gases. The sun is gigantic when compared to even the largest planet.
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a disk is free to rotate about a fixed axis. a tangential force applied a distance d from the axis causes an angular acceleration at. what angular acceleration is produced if the same force is applied a distance 2d from the axis?
The calculated answer is 2α. You must (a) increase the angular acceleration in order to increase the moment of inertia of a body about an axis.
The rotational rate of the body, measured in radians per second, is used to define the angular velocity of a rotating body about a fixed axis as (rad/s). In linear kinematics, force is what drives an object's acceleration. Similar to this, an angular acceleration is brought on by torque. As a result, torque can be thought of as the rotational counterpart to force. The force that can cause an object to rotate along an axis is measured as torque. Similar to how force accelerates an object in linear kinematics, torque accelerates an object in an angular direction. A vector quantity is a torque.
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Blocks with masses of 2. 0 kg, 3. 0 kg, and 4. 0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 14 n force applied to the 2. 0 kg block.
Force exerted on 4kg block = 6.2 N
Force exerted on 2kg block = 4.51 N
What is force?Forces are influences that can change the movement of an object. A force may change the velocity of an object of mass (m), i.e. accelerate it. Forces can also be referred by pushing or pulling. A force has both magnitude and direction and thus it is a vector quantity.
For the acceleration of all the boxes:
Fₙ = ma
a = Fₙ/m
a = 14/(2+3+4)
a = 1.55 m/s²
For 2 kg block:
Fₙ - F₁ = m₁ × a
14 - F₁ = 2 × 1.55
F₁ = 4.51 N
For 4 kg block:
F₂ = m₃ × a
F₂ = 4 × 1.55
F₂ = 6.2 N
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Complete question is as follows:
Blocks with masses of 2. 0 kg, 3. 0 kg, and 4. 0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 14 n force applied to the 2. 0 kg block.
How much force does the 3kg block exerted on 4 kg block?
How much force does the 3 kg block exerted on 2 kg block?
Pamela rode her bike at a constant rate of 0. 1 kilometer per minute. Which table represents y , the number of kilometers pamela rode her bike in x minutes?.
Table G is a representation of y, or the distance Pamela rode riding bike in x minutes. Pamela's average speed is the rate at which she moves consistently. Average speed is calculated as total distance minus total
The usual speed is what?The total distance traveled must be divided by the total amount of time it took to complete that distance in order to determine average speed. Speed refers to a thing's rate of movement at a particular moment. The term Average speed describes the speed that a journey will typically go at.
What drives us to determine average speed?Understanding average speed will help you better comprehend the pace of a travel. On a travel, the speed could occasionally change. Finding the average speed then becomes crucial to getting an idea of how quickly the route will be finished.
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A dropped rock takes 5.2 sec to fall from a cliff. How tall is the cliff? (use kinematics,
assume no air resistance)
Answer:
below
Explanation:
d = 1/2 a t^2
= 1/2 (9.81)(5.2)^2 = 132.6 m =~ 133 m
Robert pushes the box to the left at constant speed. In doing so, robert does ______ work on the box.
Robert pushes the box to the left at a constant speed. In doing so, Robert does zero work on the box.
While the speed of an item stays equal - it does not increase or lower - we say it's far shifting at a constant speed.
Regular movement is a sort of motion that takes place when both the gap traveled by means of the item is equal for every 2d or the rate of the item changes by way of the same amount every 2d. A car retains a pace of 20 meters according to second because it acts in a straight line for five seconds and is in consistent motion.
An object has a consistent speed while both the value and direction of the charge at which such an object is changing its role continue to be steady. In different words, for an object to have consistent speed, its movement has to no longer alternate guidelines through the years and the object should have steady speed as properly.
Calculation:-
we know that work done = force × displacement
and force = mass ×acceleration
here acceleration is always zero at a constant speed
So, force is also zero hence the work done is ultimately zero.
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(a) an electron and a 0.0460 kg bullet each have a velocity of magnitude 510 m/s, accurate to within 0.0100%. within what lower limit could we determine the position of each object along the direction of the velocity? (give the lower limit for the electron in mm and that for the bullet in m.) for the electron mm for the bullet m (b) what if? within what lower limit could we determine the position of each object along the direction of the velocity if the electron and the bullet were both relativistic, traveling at 0.300c measured with the same accuracy? (give the lower limit for the electron in nm and that for the bullet in m.) for the electron nm for the bullet m
Accuracy of bullet in momentum is 13.8758 * 10^-28 %
What is momentum ?
Momentum is defined as the product of a particle's mass and its velocity. Momentum is a vector quantity. It has both magnitude and direction. Isaac Newton's second law of motion states that the rate of change of momentum over time is equal to the force acting on a particle. See Newton's Laws of Motion. From Newton's second law, if a particle is subject to a constant force over a period of time, the product of that force and the time interval (momentum) equals the change in momentum. The momentum of a collection of particles is equal to the vector sum of their individual momentums.
According to Heisenberg uncertainty principle ..
( accuracy in momentum ) * ( accuracy in position ) = h / 4pi
momentum = mass * velocity
so accuracy in momentum = accuracy in velocity * mass
for electron ,..
mass = 9.1 * 10^-31 kg ...
so accuracy in momentum = 9.1 * 10^-31 * accuracy in velocity = 9.1 * 10^-31 * 0.01 / 100
so ... 9.1 * 10^-31 * 0.01 / 100 * ( accuracy in position ) = 6.626 *10^-34 / 4pi
so accuracy in position = 0.579428930
accuracy = 57.942893 %
for bullet ...
accuracy in momentum = 0.0460 * accuracy in velocity = 0.0460 * 0.01/100
so .. 0.048 * 0.01/100 * accuracy in position = 8.36 *10^-34 / 4pi
so accuracy in position = 13.8758 * 10^-30 = 13.8758 * 10^-28 %
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3. A 0.30 kg object is attached to a spring which is compressed 0.80 m by a force of 80.0 N. It hits a 0.20 kg object in a perfectly inelastic collision causing the objects to fly off of the 10.5 m high platform. a)Find the k value of the spring. b)Find the elastic potential energy in the spring. c)Calculate the final speed of the objects
Answer:24
Explanation:u just get good sum idek
A 40 kg ball is on a 15 m ledge. If it is pushed off
the ledge.
How much kinetic energy will it have just before
hitting the ground?
The final kinetic energy will it have just before hitting the ground is 5.8755 KJ.
Mass of the ball, M = 40 kg
Height of the ledge, S = 15 m
Initial velocity, u = 0 m/s (at rest)
Using equation of motion we get,
V² = u² + 2aS
V² = 0 + 2 × 9.8 × 15
V² = 294
v = 17.14m/s
kinetic enrgy is calculated as :
E = 1/2 × mass × v²
for initial velocity (u =0) kinetic energy is
E = 1/2 × 40 × 0²
E = 0J
for final velocity (v) kinetic energy is :
E = 1/2 × 40 × (17.14)²
E = 5,875.5 J
E = 5.8755 KJ
The final kinetic energy will it have just before hitting the ground is 5.8755 KJ.
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Suppose you have to move a heavy crate of weight 875 n by sliding it along a horizontal concrete floor. You push the crate to the right with a horizontal force of magnitude 300 n , but friction prevents the crate from sliding.
The static frictional force will be 490 N
What do you mean by Static frictional force?
Static friction is an external force that keeps at rest. It can be written as : The friction experienced when individuals or any objects try to move a stationary object on a surface, without actually triggering any relative motion between the body and the surface on which it is on.
Weight of the crate is, mg = 875 N
Magnitude of applied force is, F = 300 N
Coefficient of static friction is, s = 0.56
Coefficient of kinetic friction is, k = 0.47
Let the minimum force required to move the crate be Fp
The static frictional force is,
fs = s mg
= (0.56 ) (875 N)
= 490 N
For the crate to slide, we need to apply atleast Fp= 490 N
Hence in the above case the frictional force will be 490N
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An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to
the right. The friction force on this object is 30 N to the left. What is the acceleration of the
object?
Using the Newton Laws, the acceleration of the object is 2.67m/s²
Based on the problem, we can draw the diagram as below to help our understanding.
From the information provided we know that:
F = 50 N (horizontal pull)
W = 75 N
f = 30 N (friction force)
From the picture, we could focus first on the X-axis, where the horizontal force and the friction force work on the object. We would apply the second law of Newton for this axis since there is movement happening within this axis.
∑Fx = m.a
F - f = m.a
50 - 30 = m.a
m.a = 20N ... (i)
Next, we will focus on the Y-axis. In this axis neutral force and weight are working but not resulting to any movement within the axis. ence, we will be applying the first law of Newton:
∑F = 0
N - W = 0
N = W
N = 75N ... (ii)
Since we know that weight is the result of multiply between mass and gravity, we could find the mass of the object by assuming the gravity is 10m/s²
W = m.g
75 = m (10)
m = 7.5kg ... (iii)
We could subtitute the equation (iii) into equation (i) to find the acceleration of the object:
m.a = 20N
(7.5) a = 20N
a = 2.67m/s²
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a packing crate is at rest on a horizontal surface. it is acted on by three horizontal forces: 600 n to the left, 200 n to the right, and friction. the weight of the crate is 400 n. if the 600-n force is removed, the net force acting on the block is:
The force will be zero.
What is Newton's second law?
One of the most significant laws is the Newton's second law. F = ma, where F (force) and a (acceleration) are both vector values, can be used to represent a body whose mass m is constant.
The crate is not permitted that is relative to the surface before to the 600-N force being released.
It would move at no speed. Its acceleration would be 0 because its velocity isn't changing.
By combining, the 600-N force to the left and the 200-N force to the right, the combined force on the craft is equivalent to 400-N.
The resulting force acting on the crate would be zero according to Newton's Second Law. Friction, the only other horizontal force acting on the crate, ought to counteract the 400-N force.
In this instance, 400 N of friction should exert its force in the opposite direction.
Only the 200-N force to the right and friction would remain on the crate when the 600-N force is gone.
If there is to be any friction at all, it must be at least 200 N in order for there to be no net force. The static friction coefficient in this situation is unknown.
The precise value of the maximum friction on the crate cannot be determined as a result.
But keep in mind that there was 400 N of friction on the crate prior to the removal of the 600 N force. The box was nevertheless subject to the usual vertical diection force.
One can therefore be confident that the maximum force would be at least 400N to the right. That will balance the 200 N force adequately.
Therefore, the force on the crate could be zero, and the crate won't move.
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The answer of the question of force newton's second law will be zero.
What is Newton's second law?
One of the most significant laws is the Newton's second law. F = ma, where F (force) and a (acceleration) are both vector values, can be used to represent a body whose mass m is constant. The crate is not permitted that is relative to the surface before to the 600-N force being released. It would move at no speed. Its acceleration would be 0 because its velocity isn't changing.
The static friction coefficient in this situation is unknown. But keep in mind that there was 400 N of friction on the crate prior to the removal of the 600 N force. The box was nevertheless subject to the usual vertical diection force. One can therefore be confident that the maximum force would be at least 400N to the right. That will balance the 200 N force adequately.
Therefore, the force on the crate could be zero, and the crate won't move.
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