Answer:
A pair of scissors used to cut a piece of cloth has blades longer than the handles so that the blades move longer on the cloth than the movement at the handles.
While shears used for cutting metals have short blades and long handles because as it enables us to overcome large resistive force by a small effort.
What can affect the properties of a substance?
A. Only the arrangement of atoms
B. Only the types of atoms
C. Neither the arrangement nor the types of atoms
D. The arrangement and types of atoms
An object traveling at a constant velocity of 15 m/s is experiencing no net
force.
True or
False
A physics student swings a tennis ball connected to a rope in a vertical circle with a constant speed of 6.29 m/s. The ball has a period of 0.5 seconds. Determine the length of the rope (the radius of the circle.
Answer:
r = 0.5 m
Explanation:
First we find the angular speed of the ball by using its period:
ω = θ/t
For the time period:
ω = angular speed = ?
θ = angular displacement = 2π rad
t = time period = 0.5 s
Therefore,
ω = 2π rad/0.5 s
ω = 12.56 rad/s
Now, for the radius:
v = rω
r = v/ω
where,
v = linear speed = 6.29 m/s
r = radius = ?
r = (6.29 m/s)/(12.56 rad/s)
r = 0.5 m
The total weight of a car with passengers is 30,000N. The area of contact of each of the four tyres with the ground is 0.025m2. Determine the minimum car tyre pressure
Answer:
The minimum pressure car tire pressure is 300,000 Pa
Explanation:
Pressure
It's a measure of the force exerted by an object per unit surface:
[tex]\displaystyle P=\frac{F}{A}[/tex]
Where F is the force applied on a surface area A.
We are given the total weight of a car with passengers as Ft=30,000 N and we also know the area of contact of each tire with the ground as [tex]A=0.025 m^2[/tex].
The minimum pressure each tire can have is when the total weight is evenly distributed in all four tires, thus F=Ft/4=7,500 N.
Calculating the pressure:
[tex]\displaystyle P=\frac{7,500}{0.025}[/tex]
P=300,000 Pa
The minimum pressure car tire pressure is 300,000 Pa
An 856 kg drag race car accelerates from rest to 105 km/h in .934s. What change in momentum does the force produce? Answer in units of kg • m/s
Part 2: what average force is exerted on the car? Answer in N
Hello!
Topic: Dinamic
Value to calculate: Force
First, we have to calculate the aceleration, for that, lets aplicate the formula:
[tex]\boxed{a=\frac{V-Vi}{t} }[/tex]
How the final velocity is in km/h, we have to convert it on m/s, so:
m/s = km/h / 3,6
m/s = 105 / 3,6
m/s = 29,16
Then, lets replace formula according problem information:
[tex]a = \dfrac{29,16m/s-0m/s}{0,934s}[/tex]
[tex]a =31,22\ m/s^{2}[/tex]
Now, how we have the aceleration, lets applicate second law of newton for calculate the force produced:
[tex]\boxed{F=ma}[/tex]
Replace and resolve it:
F = 856 kg * 31,22 m/s^2
F = 26724,32 kg * m/s^2
Then the force is of 26724,32 kg * m/s^2
But how we know an 1 kg * m/s^2 = 1 N
Then the average of the force is of 26724,32 N
(1) The change in momentum of race car is 89880 kg-km/h.
(2) The average force exerted on the car is of 96231.26 N.
Given data:
The mass of race car is, m = 856 kg.
The initial speed of car is, u = 0 km/h.
The final speed of car is, v = 105 km/h.
The time interval is, t = 0.934 s.
1)
The change in the impact due to average force is known as momentum change. The expression for the change in momentum is given as follows,
[tex]\Delta P = m(v-u)[/tex]
Solving as,
[tex]\Delta P = 856 \times (105-0)\\\\\Delta P = 89880 \;\rm kg.km/h[/tex]
Thus, we can conclude that the change in momentum of race car is 89880 kg-km/h.
2)
Now, use the concept of impulse-momentum which says that the impulse is equal to change in momentum. Which means,
[tex]I = \Delta P[/tex]
And impulse is,
[tex]F \times t = \Delta P\\\\F = \dfrac{\Delta P}{t}[/tex]
Solving as,
[tex]F = \dfrac{89880}{0.934}\\\\F = 96231.26 \;\rm N[/tex]
Thus, we can conclude that the average force exerted on the car is of 96231.26 N.
Learn more about the impulse-momentum theorem here:
https://brainly.com/question/14121529
After 20 seconds, a 200-kg object increases its velocity from 15 m/s to 40 m/s. Determine the impulse applied to the object. (Also show your work so I can understand it better and ty)
Answer:
Imp_{1-2}=5000[kg*m/s]
Explanation:
In order to solve this problem, we must use the principle of conservation of momentum, which is defined as the product of mass by Velocity.
It must be defined that the impulse after the force is applied is equal to the momentum before the impulse applied on the body.
ΣPbefore = ΣPafter
P = momentum = m*v [kg*m/s]
In this way, we will construct the following equation.
[tex](m_{1}*v_{1})+ Imp_{1-2}=(m_{1}*v_{2})[/tex]
where:
m₁ = mass of the object = 200 [kg]
v₁ = velocity of the object before the impulse = 15 [m/s]
v₂ = velocity of the object after the impulse = 40 [m/s]
Now replacing:
[tex](200*15) + Imp_{1-2} = (200*40)\\Imp_{1-2}=5000[kg*m/s][/tex]
Who is son of nation
Explanation:
well the father of nation is Mahtma Gandhi.
What would take more work: a 10 kg bowling ball lifted 1 meter off the ground, or a 1 kg laptop lifted 10 meter off the ground? Explain how you arrived at your answer. PLEASE HELP!!!!!!!!!! 50 POINTSSSSS
Answer:
10kg ball
Explanation:
a laptop is a lot less in weight so you have to use less force to lift it
Answer:
10 kg bowling ball
Explanation:
A h e m.
It would be easy to lift 1kg laptop 20 meters without breaking a sweat and would be less than your body weight. But a 10kg bowling ball is that x10 so its heavier
b.A certain piece of copper wire is determined to have a mass of 2.00 g per meter.
How many centimeters of the wire would be needed to provide 0.28 g of
copper?
Help please!!
Answer:
14cm
Explanation:
Mass per gram of the piece of wire;
2g of the wire is found in 1m
Since
100cm = 1m;
So;
100cm of the wire contains 2g of the wire
To provide 0.28g
Since;
2g of wire is made up of 100cm
0.28g of wire will be contained in [tex]\frac{100 x 0.28}{2}[/tex] = 14cm
14cm of the wire will contain 0.28g
which list places different units of matter in the correct sequence from largest to smallest
Answer:
B: Human body, organs, molecules, atoms neutrons. please correct me if im wrong
Explanation:
A P ex
The list that places different units of matter in the correct sequence from largest to smallest is as follows:
The human body, organs, molecules, atoms neutrons.What is the matter?Matter may be defined as a type of substance that possesses a specific mass and occupies space by having a specific volume. So, it certainly has both mass and volume. In nature, each and every object is made up of matter.
With respect to the question, the human body is the largest unit that consists of matter. The body of a human generally consists of numerous organ systems which are built through the collection of other different organs.
The organ is further made up of the collection of tissues that are formed by the collection of cells. Cells possess numerous molecules which are made of atoms. Atoms have three types of subatomic particles, i.e. electrons, protons, and neutrons.
Therefore, the list that places different units of matter in the correct sequence from largest to smallest is well mentioned above.
To learn more about Matter, refer to the link:
https://brainly.com/question/16982523
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Your question seems incomplete. The most probable complete question is as follows;
Which list places different units of matter in the correct sequence from largest to smallest?
The human body, organs, molecules, atoms, and neutrons.Neutrons, atoms, molecules, organs, and the human body.Molecules, atoms, neutrons, human body, and organs.Pls help, I have a test on this, with explanation.
Answer:
the answer is B
Explanation:
we assume that all of these springs have tha same k , the spring constant
elastic energy for the initial system = Ep1= [tex]\frac{kd^{2} }{2}[/tex]
for the new changed system , the spring constant = k1+k2 = k+k = 2k , but the displacement is also reduced to 0.5 d
so Ep2 = [tex]\frac{2k(0.5d)^{2} }{2} = \frac{kd^2}{4}[/tex]
so the new total Ep stored in the new system is 1/2Ep
hope it helps
slope or velocit ime graph represent
2. What is instantaneous acceleration?
3. What is unit vector?
Answer:
Please check the explanation.
Explanation:
The slope of the velocity-time graph illustrates the change in velocity with respect to change in time.
In other words, the acceleration of the object is defined by the slope of a velocity graph. The acceleration can be obtained by finding the slope at a particular time.
Hence, the slope of the velocity time graph represent represents acceleration.
2. Also the acceleration of any object, like a car or bike, at some discrete instant in time 't' is termed as instantaneous acceleration which can be determined if we may take the derivate of the given velocity function.
3. A vector that has a direction and magnitude of 1 is termed as a unit vector, often called a direction vector.
Having good etiquette and sports ethics will make you a more respected player.
Answer:
this is true
Explanation:
just did the it on edg 2020
Answer:
True
Explanation:
A shopper walks westward 2.8 meters in the first 5 minutes and then eastward 9.2 meters in the next 10 minutes. What is the shopper's total travel distance?
Answer:
12m
Explanation:
Given parameters:
Distance walked westward = 2.8m
Time of travel = 5min
Distance walked eastward = 9.2m
Time of travel = 10min
Unknown:
The total shopper's travel distance = ?
Solution:
Total distance traveled is the sum of the length of path covered by a body. It is a scalar quantity.
Total distance = distance walked westward + distance walked eastward
Total distance = 2.8m + 9.2m = 12m
What is shown by the pattern of iron filings around these two magnets?
A. Opposite poles repel because no magnetic field forms between them.
B. Like poles attract because the magnetic field lines extend between them.
C. Like poles repel because the magnetic lined bend away from each other.
D. Opposite poles attract because the magnetic field lines cross each other.
The pattern of iron fillings around the magnet depicts that like poles repel because the magnetic lined bend away from each other. Thus, option C is correct.
What are magnetic field lines?The North Magnetic Pole would move via magnetic field lines, which are hypothetical lines. The magnet's oppositely polarized poles attract and repel one another.
Since the magnetic field lines inside the magnet run from the south pole to the north pole, Never do magnetic field lines cross one another. A closed loop is formed by magnetic field lines.
Because magnetic force lines are bending in the direction of the south pole in the illustration, like poles repel one another. If the magnetic lines are bent away from one another, like poles repel one another.
Thus, image given has the presence of lines bending away from each other, thereby are like poles repel. Hence, option C is correct.
Learn more about magnetic filed lines here:
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A map of earthquakes and volcanoes on Earth shows that they do not occur in evenly distributed areas, but they also do not occur randomly over Earth's surface. Describe what GPS measurements show about the distribution of locations where earthquakes and volcanoes occur.
Which statement best describes scientific laws? (2 points)
O Scientific laws are scientists' opinions of why events occur.
Scientific laws are facts that describe observed reoccurring natural events.
Scientific laws explain why natural events occur.
Scientific laws were theories that have been proven to be true.
Answer:
Scientific laws are facts that describe observed reoccurring natural events.
Explanation:
Scientific laws are explanations for the behavior of the natural world. Scientific theories are explanations for scientific laws.
Please help ACTUALLY ANSWER i dont understand CER writing?
this is an example:
Claim: cookies are good because they are good
evidence : ¨cookies have 1 billion protien¨- the new york times
reasoning: (what would i put here???)
PLEASE HELP AND ACTUALLUY ANSWER
a flywheel turns at 600 rpm compute the angular speed at any point on the wheel and the tangential speed 0.5 m from the centre
Answer:
30m÷hour
Explanation:
600÷0.5=30m÷hour
a 110 volt wall outlet supplies power to a stereo with a resistance of 10 ohms. how much current is flowing through the stereo?
Answer:
look in internet u can find online converter and there u will get a rel answer
Explanation:
what is the process of subduction
Answer:
Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to high gravitational potential energy into the mantle. Regions where this process occurs are known as subduction zones.
What part of the plant takes in carbon dioxide?
1.Roots
2.Stomata
3.Minerals
4.Soil
The answer is number 2 stomata.
Determine the momentum of a 25kg freshman football player moving southward at 2m/s.
Answer:
50 kg*m/s southward
Explanation:
p=mv
=25kg(2m/s)
=50 kg*m/s
Write a letter to a Friend congratulating her / him for her excellent result in annual examination. class 5 the
Answer:
ok will do that
Explanation:
What does Newton's first law describe?
A. The tendency of moving objects to stay in motion
OB. The attractive force between two objects due to their masses
O C. How forces balance out to zero net force
D. The change in an object's position over time
Answer:
A. the tendency of moving objects to stay in motion
Explanation:
just did it on ap3x
Define Continental Drift
Answer:
the gradual movement of the continents across the earth's surface through geological time.
Answer:
Continental drift is the hypothesis that the Earth's continents have moved over geologic time relatives to each other.
How much net force is required to accelerate a 6 kg toy car initially at rest to a velocity of 2m/s in 4s?
Answer:
3N
Explanation:
Given parameters:
Mass of toy car = 6kg
Initial velocity = 0m/s
Final velocity = 2m/s
Time = 4s
Unknown:
Net force = ?
Solution:
The net force is given by;
Force = mass x acceleration;
Force = mass x [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Now insert the parameters and solve;
Force = 6 x [tex]\frac{2 - 0}{4}[/tex] = 3N
a car is moving 18m/s to the east. if it takes the car 5 seconds to reach a velocity of 19 m/s to the east, what is its acceleration?
Kinematics
First Velocity (Vf) = 18 m/s
Last Velocity (Vl) = 19 m/s
time (t) = 5 seconds
acceleration = ______?
Answer :
Vl = Vf + a × t
19 = 18 + a × 5
19 - 18 = 5a
1 = 5a
1 / 5 = a
0,2 m/s² = a ✅
Answer: 0.2 m/s^2 east
Explanation:
A PE X
4. A car, initially traveling east with a speed of
5.0 m/s, is accelerated uniformly at 2.0 m/s2 east for
10 s along a straight line. During this 10 s
interval the car travels a total distance of
A. 50 m
B. 60 m
C. 100 m
✓ D. 150 m
Answer:
150 m
Explanation:
Given,
u=5m/s
a=2m/s2
t=10s
v=?
s=?
Now,
v=u+at
=5+2×10
=5+20
=25m/s
So,
s=u+v/2×t
=5+25/2×10
=30/2×10
=15×10
=150m
A 0.15 kg project hits the ground with a speed of 11 m/s. The project comes to rest in 0.015 seconds. What is the net force?
Answer:
Explanation:
ACCORDING TO NEWTONS SECOND LAW;
F = mass * acceleration
F = m(v-u/t)
m is the mass = 0.15kg
v is the final velocity = 11m/s
u is the initial velocity = 0m/s
t is the time = 0.015
Substitute;
F = 0.15(11-0)/0.015
F = 0.15(11)/0.015
F = 1.65/0.015
F = 110N
Hence the net force is 110N