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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What exerts a force that causes other electric charges to move.
causes other electric charges in the electric field to move. When a charge is placed in an electric field, the field will either pull or push the charge.
What propels the charges forward?A charge moves, transferring energy that can be put to use for work. The force of attraction or repulsion between charged particles is what moves a charge because it is the same force that builds up a charge in the first place.
The electric charge is pushed by what?An electric field pushes the charges forward. We require an electric potential (voltage) source to force electrons from a point of low potential energy to one of higher potential energy.
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w1, w2 and w3 are the weights of three objects suspended by pulleys as shown. assuming the pulleys in this system are frictionless and weightless and that w3
The values of W1 and W2 if W1, W2 and W3 are the weights of three objects suspended by pulleys as shown are 8 N and 11.4 N respectively
∑ Fx = 0
T2x - T1x = 0
T1 cos 24° = T2 cos 50°
T1 = 0.7036 T2
To remain at rest,
T1 = W1
T2 = W2
∑ Fy = 0
T1y + T2y - W3 + T1 - W1 + T2 - W2 = 0
T1 sin 24° + T2 sin 50° - 12 = 0
( 0.7036 T2 ) sin 24° + T2 sin 50° = 12
0.286 T2 + 0.766 T2 = 12
T2 = 11.4 N
W2 = 11.4 N
T1 = 0.7036 * 11.4
T1 = W1 = 8 N
Therefore, the values of W1 and W2 are 8 N and 11.4 N respectively
The given question is incomplete. The complete question is:
W1, W2 and W3 are the weights of three objects suspended by pulleys as shown. W3 = 12 N and assume that the pulleys in this system are frictionless and weightless. Determine the values of W1 and W2. The free body diagram is shown in the image attached.
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as light hits the retina, the first structure the light encounters is a rod or a cone. as light hits the retina, the first structure the light encounters is a rod or a cone. true false
As light hits the retina, the first structure the light encounters is a rod or a cone is a false statement.
What is Retina?The layers of light-sensitive nerve tissue at the back of the eye that take in images and transmit them as electric signals to the brain via the optic nerve is termed as retina.
What is light?Electromagnetic radiation that can be seen by the human eye is known as light or visible light. Typically, visible light is characterized as having wavelengths between 400 and 700 nanometers, or 750 and 420 terahertz, or frequencies between the infrared and the ultraviolet.
Contrary to what might make sense, light has to pass through the ganglion cells first, through the bipolar cells, and finally strikes the rods and the cones.
Hence, as light hits the retina, the first structure the light encounters is a rod or a cone is a false statement.
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a projectile is launched horizontally from a height of 65 meters with an initial horizontal speed of 35 meters pre second. what is the projectile's horizontal speed after it has fallen 25 meters? 22 m/s 35 m/s
Answer: 35m/s
Explanation: answer from castle learning
A projectile is launched horizontally from a height of 65 meters with an initial horizontal speed of 35 meters pre second. projectile's horizontal speed after it has fallen 25 meters is 35 m/s.
what is speed ?Speed is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only direction and no magnitude.
The formula of speed is represented as s=d/t, Where, s is the speed in m.s-1, d is the distance traveled in m, t is the time taken in s
There are four types of speed such as Uniform speed, Variable speed, Average speed, Instantaneous speed
Uniform speed is an uniform speed when the object covers equal distance at equal time intervals, variable speed is defined as when the object covers a different distance at equal intervals of times.
Average speed is defined as the uniform speed the ratio of total distance travelled by an object to the total time taken by the object.
Instantaneous speed is defined as an object is moving with variable speed, then the speed at any instant of time is known as instantaneous speed.
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suppose the potential energy of the block at the table is given by mgh/3 . this implies that the chosen zero level of potential energy is __________.
suppose the potential energy of the block at the table is given by mgh/3. this implies that the chosen zero level of potential energy is a distance of 2h/3 above the floor.
In physics, potential power is the electricity held by way of an item due to its position relative to other items, stresses inside itself, its electric fee, or other factors. The term potential strength became brought by way of the 19th-century Scottish engineer and physicist William Rankine
Not unusual kinds of capacity strength consist of the gravitational capacity power of an object, the elastic ability strength of a prolonged spring, and the electric capability energy of an electric fee in an electric field. The unit for electricity in the worldwide gadget of units (SI) is the joule, which has the symbol J.
Because the paintings of capacity forces appearing on a body that actions from a beginner to a cease position are determined simplest with the aid of these positions and do no longer depend upon the trajectory of the body, there is a characteristic called capacity that can be evaluated at the two positions to determine these paintings.
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at what altitude should a satellite be placed into circular orbit so that its orbital period is 48 hours?
In order for the satellite to have an orbit with a 48-hour period, its orbit must be positioned in a circular orbit at an altitude of 60.689*106m. At this time, altitude is calculated from Earth's surface.
Therefore, the radius of the Earth is subtracted from the total radial distance to get the altitude of the satellite's orbit. orbit of a satellite Satellite orbits are divided into high and low orbits, polar orbits (when the earth's spin axis is included within the orbit plane), equatorial orbits (when the earth's equatorial plane coincides with the orbit plane), and pro-grade and retrograde or bits (the direction of satellite motion is either eastward or westward).
R = 67.067*10^6 m
As a result, height (h) is equal to total radial distance (r) minus earth's radius (R). For example, h=(60.067 - 6.378)*106m; h= 60.689*106m.
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when water is cooled and circulated throughout the building to air-heat exchange coils, the water is referred to as a(n
Water is referred to as a secondary refrigerant when it is cooled and circulated all through the building to higher ventilation coils.
How do secondary refrigerants work?With the help of secondary refrigerants, the quantity of primary refrigerants that are bad for the environment can be kept to a minimum and contained. In contrast to conventional refrigerants like HCFCs, secondary refrigerants, such as water, air, hydrocarbons, ammonia, and carbon dioxide, are less harmful to the environment.
Why are secondary refrigerants advantageous?The benefits of using refrigerants for industrial cooling include having a low primary refrigerant charge, preserve and enhance by limiting the use of the primary refrigerant to the engine compartment, a secondary pipe system that may occasionally be smaller, and the ability to use alternative insulations.
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I need to know the why for the two questions.
4. If the moon falls, it does not get closer to earth due to the effect of gravity.
5. On increasing the mass of the sun then the earth's tangential velocity also increases.
4)Similar to how the earth orbits the moon, but because of the speed at which it caught up to the earth, the moon is prevented from colliding with the planet by the force of gravity.
Because of this, even though the moon is edging a tiny bit farther from our planet, it is kept in a pretentious orbit around it.
5) the earth tangential velocity increases if the mass of the sun increased.
Tangential velocity :It is the linear component of any object's speed that is travelling in a circle.
To keep an object moving uniformly in a circle, a stronger centripetal force is needed.4. If the moon falls, it does not get closer to earth due to the effect of gravity.
5. On increasing the mass of the sun then the earth's tangential velocity also increases.
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the resistance of a drill is ___ ohms where the nameplate supplies the following information: 5.4 amps 120 volts
Answer: 648 Ohms
Explanation:
RA = VI
Resistance = voltage x current
R = 120V x 5.4 = 648 Ohms
Gold has a density of 19,300 kg/m³. Calculate the mass of 0.02 m³ of gold in kilograms.
which of the following safety harnesses is the safest and most recommended when hunting from a treestand?
The best tree stand safety harness is the Hunter Safety System Hybrid Flex Safety Harness, with its awesome ElimiShield Scent Control Technology.
Moreover, These stands are designed to be attached directly to the tree. Hunters using a fixed or suspended stand must choose a method of climbing up and down from the platform. The safest and most used method is sectional ladders.
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water is moving at a velocity of 2.00 m/s through a hose with an internal diameter of 1.90 cm. what is the flow rate in liters per second? (you do not need to enter any units.)
A hose's internal diameter is 1.90 cm, and the water is flowing through it at a speed of 2.00 m/s. 4021 liters per second (L/s) is the flow rate.
Describe some instances of velocity.The speed at which an object is moving in a certain direction is known as its velocity, to put it simply. Using a car traveling north on a highway as just an example, or a rocket once it has taken off as a speed example. According to the definition of a scalar, the absolute magnitude of the velocity vector is always equal to the speed of the motion.
In physics, what does the term "velocity" mean?A body's or an object's velocity determines which way it moves. Speed is often a scalar variable. Velocities are vector quantities in their most basic form. It gauges how quickly an area changes in distance. The displacement's pace of change is what matters. 1.90 cm, ter. In liters per second
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5. A car travels at a steady speed of 80kmh-1. How far will it travel in 900 seconds?
Answer:
below
Explanation:
3600 seconds in an hour
900 sec / 3600 sec/hr = .25 hr
80 km /hr * .25 hr = 20 km
Which statement best describes a weak base?(1 point)
a.) It donates protons and only partially dissociates in water.
b.) It accepts protons and only partially dissociates in water.
c.) it donates protons and completely dissociates in water.
d.) It accepts protons and completely dissociates in water.
Answer:
It accepts protons and only partially dissociates in water.
good luck bro <3!
1) a solid sphere has a radius of 5 cm and a mass of 350 grams. what is its average density? a hollow sphere has the same radius and mass. what is its average density?
To calculate the average density of the hollow sphere learn the radius and density.
What is radius?
Simply halving the circle's diameter yields the radius formula. The radius of the ring is the line segment formed when we join a point on a circle's circumference to the exact center. The radius of a circle is the distance separating its center from its perimeter.
What is density?
When a material is packed tightly, it is said to have a high density. Its definition is the ratio of mass to volume. Density begins with the letter D. density formula is given as = m/V for objects with masses m and volumes V.
Volume of solid sphere = 4 pi r^3 / 3
= 4 x pi x 5^3 / 3
= 523.6 cm^3
mass = 350 g
average density = mass / volume
= 0.668 g/cm^3 Or 668 kg / m^3
If Sphere is hollow, then also it will acquire same volume in the space.
hence average velocity will not change.
Therefore, its average density is 0.668 g/cm^3 Or 668 kg / m^3
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Mort and Velma are twins, born at the same time on Earth. Velma is taken on a long trip into outer space, at a speed close to light speed, and returns to Earth. When she returns,
a. Mort and Velma both observe that Velma is older than Mort.
b. Mort and Velma both observe that Mort is older than Velma.
c. Mort observes that he is older than Velma, and Velma observes that she is older than Mort.
d. Mort observes that he is younger than Velma, but Velma will observe that she is younger than Mort.
e. Mort and Velma observe that they have aged equally
Using the concepts of light, we got that option b)Mort and Velma both observe that Mort is older than Velma is observed by Velma who is taken on a long trip into outer space, at a speed close to light speed.
Light or visible light is the electromagnetic radiation that can be perceived by human eye. Visible light is usually defined as having wavelengths in range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz, between infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).
In physics, the term "light" may actually refer more broadly to electromagnetic radiation of any wavelength, whether the visible or not.[4][5] In this sense, gamma rays, X-rays, microwaves and the radio waves are also light. The primary properties of light are the intensity, propagation direction, frequency or the wavelength spectrum and polarization.
Hence, Mort and Velma are twins, born at the same time on Earth, when Velma is taken on a long trip into outer space, at a speed close to light speed, and returns to Earth, and when she returns, Mort and Velma both observe that Mort is older than Velma.
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an object is at rest on the ground. the object experiences a downward gravitational force from earth. which of the following predictions is correct about why the object does not accelerate downward? select two answers. justify your selections.
Predictions about why the object does not accelerate downward are (1) the bonded molecules of the object are repelled upward by the bonded molecules of the ground with the same magnitude as the gravitational force downward on the object, and (2) the normal force is exerted upward on the object from the ground with the same magnitude as the gravitational force downward on the object.
What is the normal force?The normal force is simply the force that two surfaces in contact exert to each other to prevent themselves from passing through each other. Since the normal force is a contact force, two surfaces that aren't in contact can't exert a normal force on each other. The normal force will be as large as necessary to make net force equal zero.
The normal force is generated by the electromagnetic force: the electrons in an object are pushing against the electrons in another object.
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a tow truck exerts a force of 450 lb on a car, causing it to accelerate at 10ft/s^2 . what is the mass of the car? group of answer choices 45 slugs 45 kg none of the above 45 lbm
Angle 32rad turn during that time if the angular acceleration is constant.
What is acceleration?
acceleration, rate at which the velocity changes with time, in terms of both speed and the direction. A point or else it's an object moving in a straighten line is accelerated if it is speeds up or slows down. Motion on a circle is the accelerated even if the speed is constant, because of the direction is continually changing.
Sol- In an uniformly accelerated circular motion, the angle traveled by the object is given by- ∆=wf+wo/2×t
Here wf is the final angular speed.
It is the initial angular speed and t is the time of the motion. Replacing the given values-
∆= 12 rad/s + 4 rad/s /2 (4s)
∆= 32rad .
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Ebo throws a ball into the air its velocity at the start is 18m/s at an angle of 37° to the ground. What is the range of the ball
The range of the ball, given that it was thrown with a velocity of 18 m/s at an angle of 37 ° is 31.78 m
How to determine the range of the ball?The range of the ball can be obtained by using the following formula:
R = u²Sine(2θ) / g
Where
R is the rangeu is the initial velocity θ is the angle of projectiong is acceleration due to gravityFrom the question given above, the following data were obtained:
Initial velocity (u) = 18 m/sAngle of projection (θ) = 37 ° Acceleration due to gravity (g) = 9.8 m/s²Range (R) =?The range of the ball can be obtained as follow:
R = u²Sine(2θ) / g
R = 18² × Sine (2×37) / 9.8
R = 31.78 m
Thus, the range of the ball is 31.78 m
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nichrome wire 85 cm long and 0.25 mm in diameter is connected to a 1.6 volt flashlight battery. what is the electric field inside the wire?1.88 correct: your answer is correct. v/m
The electric field will be 1.9 V /m
The length of the wire is l = 85.
The diameter of the wire is d = 0.25mm
.The voltage of the battery is V = 1.6 V.
(a) The expression for the electric field inside the wire is,
E=( V / L )
Substituting the given values in the above expression, we will get
E = 1.6V / 85cm ( 1m /100cm)
= 1.6V / 0.85 m
= 1.88 V / m
= 1.9 V / m
Hence, the electric field will be 1.9 V /m.
What do you mean by Electric Field ?
Electric field can be defined as an electric property which is associated with each point in the space where a charge is present in any form. An electric field is also described as the electric force per unit charge.
The formula of electric field is given as;
E = F /Q
Where,
E is the electric field.
F is a force.
Q is the charge.
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.
What type of magnetism is present in a paper clip when it is attracted to a nearby bar magnet?.
Answer:magnetically polarized
Explanation:A steel paper clip near a magnet will be magnetically polarized by the magnet so that it is at least temporarily a magnet. If we use the magnetic pole model of magnets, the side of the clip near a North pole of a magnet will become a South pole, and the other side will become a North pole.
a grinding wheel is rotating with an angular velocity of 251 radians per second, find the period of one revolution.
Using the concepts of angular velocity, we got that 0.025sec is the period of one revolution for a grinding wheel which is rotating with an angular velocity of 251 radians per second.
We know that angular velocity is defined as the change of angular displacement with respect to time.
or ,ω=θ/t
Here, grinding wheel is circular in shape means total angular displacement is 360 degree or 2[tex]\pi[/tex]
So according to the formula,
=>251=2π/t
=>t=2π/251
=>t=(2×3.14)/251
=>t=6.28/251
=>t=0.025sec
Hence, if a grinding wheel is rotating with an angular velocity of 251 radians per second, the period of one revolution is 0.025sec.
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what is the maximum value the string tension can have before the can slips? the coefficient of static friction between the can and the ground is 0.60.
It will take 3.07 m long to reach at its maximum value
The volleyball will reach at the maximum height at 0.673 s after it is served.The Calculating for the height the volleyball will reach before going to downwards. Therefore the volleyball will do have a maximum value of 3.07 m with respect to the ground.
3.78 m Ignoring resistance, the ball will travel upwards until it's velocity is 0 m/s. So we'll first calculate how many seconds that takes.
7.2 m/s / 9.81 m/s^2 = 0.77945s
The distance traveled is given by the formula d = 1/2 AT^2, so substitute the known value for A and T, giving
d = 1/2 A T^2 d = 1/2 9.81 m/s^2 (0.77945 s)^2 d = 4.905 m/s^2 0.607542 s^2 d = 2.979995
m So the volleyball will travel 2.979995 meters straight up from the point upon which it was launched. So we need to add the 0.80 meters initial height.
d = 2.979995 m + 0.8 m = 3.779995
m Rounding to 2 decimal places gives us 3.78 m.
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The reason that most seti programs choose to listen at microwave radio frequencies is that.
Microwaves are most energy efficient way to send information.
What are SETI programs?Electromagnetic waves are a general term for familiar light and radio waves, but they also include gamma rays, X-rays, ultraviolet rays, and infrared rays. All of these forms of electromagnetic radiation or waves travel at the speed of light, the highest possible speed. The only difference between these types of electromagnetic waves is their length, or wave, or "wavelength." Another way to characterize waves is the number of waves received per second, since they all travel at the speed of light. This is the wave frequency. A specific range of radio frequencies from 1 GHz to 10 GHz, "microwaves", is particularly well suited for interstellar communications. At lower frequencies, our galaxy emits enormous amounts of radio waves, creating a large amount of background noise. At higher frequencies, the Earth's atmosphere, and possibly other Earth-like planets, absorb and emit a wide range of radio frequencies. The result is a quiet "microwave window" that enables efficient wireless communication.
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below are six different sequences of snapshots taken as the two pulses meet in the middle of the string. time increases from top to bottom in each sequence. which sequence correctly represents the displacement of the string as the pulses interfere?
Option C is the sequence which correctly represents the displacement of the string as the pulses interfere. When a wave pulse encounters a free end then it reflects the same way as incident path which is depicted in option C.
Longitudinal waves are waves in which the medium is moved in the same direction as the wave's propagation. The wavelength determines the separation between the centres of two adjacent compression or rarefaction areas.
An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an aeroplane or a lecturer moves to the right in relation to a whiteboard. Displacement describes this shift in location.
The amount of medication needed to replace 1 gramme of suppository base is known as the displacement value. Coca Butter or Theobroma oil is the most used foundation for suppository preparation. Suppositories are traditionally made in suppositories moulds, which typically accommodate 1 or 2 grammes of base.
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two ropes support a load of 663 kg. the two ropes are perpendicular to each other, and the tension in the first rope is 1.94 times that of the second rope. find the tension in the second rope. the acceleration of gravity is 9.8 m/s 2 . answer in units of n.
Formulas for the balancing of forces
Examine the force diagram in the graph that is attached:
∑Fx=0
T1sen - T2cos = 0 Equation
∑Fy=0
T1cos ∝ + T2sin ∝ - W = 0. Equation(2)
forces in the x and y directions,
Horizontal movement
T1*CosA=T2*Cos(90-A)
Vertical Movement
m*g = T1*SinA + T2*Sin(90-A) (2)
We also know that T1=1.91 and T2 (3)
Thus, the final equations are
T1*CosA=T2*Cos(90-A)
A=62.365235 degrees using (2) and substituting a value for (3)
460*9.8 = 1.91*T2 *Sin(62.365235) + T2 *Cos(62.365235)
T2 = 4508 / (2.1559) = 2090.96 N
T1 = 1.91*T2 = 3993.737 N
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Explain how the model shows selective permeability of the membrane to specific ions.
The model depicts two types of distinct, water-soluble ions—solid and spotted—but only the solidly coloured ions traverse the membrane channel into the cell, demonstrating the selective permeability of the membrane to particular ions. Since the membrane is only selectively permeable to the solid coloured ions in this instance, the dotted ions cannot pass through it.
Define selective permeability?
Selective permeability describes the plasma membrane's capacity to let some chemicals pass through while preventing others.Through the plasma membrane's selective permeability, the cell may control the admission of chemicals.Passive or energetic passage of substances across the membrane are both possible.
Similar conditions must be met for substances to flow through the plasma membrane; for example, glucose must be carried into the gate while tiny, non-polar molecules like oxygen and carbon dioxide can pass through with ease.
Because of its composition and structure, the plasma membrane exhibits selective permeability. A phospholipid bilayer makes up its structure.
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2. electrical appliances are usually grounded in order to (a) maintain a balanced charge distribution (b) prevent the buildup of heat on them (c) run properly using household electricity (d) prevent the buildup of static charges on their surfaces
Electrical appliances are usually grounded in order to-
(a) maintain a balanced charge distribution.
What is meant by Grounding?
By transferring electrons between one thing and a larger object, a process known as grounding allows one to reduce an object's excess charge.When an object is grounded, the excess charge is reduced due to the transfer of electrons from the grounded object to the ground.
A ground is essentially an object that acts as an apparently endless source of electrons. It has the ability to send electrons to or absorb electrons from charged objects in order to neutralize such objects.
Hence, the correct option is-
(a) maintain a balanced charge distribution.
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what is the net torque about the axle? express your answer in newton-meters to two significant figures.
The net torque in the above case would be 0.2 N m
T = r x F net
T = 0.02 x (30-20)
T = 0.2 N m
What is net torque in physics?
Net Torque can be defined as one force acting on an object to cause torque. It is the sum of the individual torques. The standard unit is Newton meters, or Nm. It can be either static or dynamic. The daily examples of torques include opening a bottle cap or turning a steering wheel.
Applications of torques include
Seesaws and WrenchesGyroscopesA pendulum or a parachute is applying torque when swingingA person riding a bicycleFlag flying on a mastThis is how net torque is used in the above case.
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a garden hose attached with a nozzle is used to fill a 20-gallon bucket. the inner diameter of the hose is 1 inch and it reduced to 0.5 inches at the nozzle exit. if the average velocity in the hose is 8 ft/s, determine:
In order to calculate average velocity, divide the change in position or displacement (x) by the time intervals (t) during which the displacement takes place. Depending on the displacement's sign, the average velocity can either be positive or negative. metres per second is the average velocity SI unit.
acceleration: the rate at which the speed and direction of a moving object vary over time. When anything moves faster or slower, it is said to be accelerating or decelerating in a straight line. Since the trajectory is always changing, travel on a circle accelerates even while the speed is constant.
A1=(1/2)ˆ2 x 22/7
A1= 0.785
A2= 0.0625 x22/7
A2=0.196
V=(A1-A2)xv
V=0.589x8
V=4.72
= 8.33 / 4.72 mass flow rate
1.76 gal/s of mass flow
Duration: 20/1.76
duration: 11.36 seconds
A1v1=A2v2
A1v1/A2=v2
v2=8x0.785/0.196
v2=32.0 ft/s
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