# A car is travelling at a constant speed on a flat road TRUE OR FALSE -the car is in equilibrium (T/F) -the car is accelerating (T/F) -there is a net force on the car (T/F) -there is work being done on the car (T/F)

2 months ago

## Solution 1

Guest #6877329
2 months ago

The car is in equilibrium, false. Because the net movement of a body in equilibrium is zero. Since the car is moving it is not in equilibrium

The car is accelerating, false. Because the car is travelling at constant speed, the change of speed of the car per unit time is zero.

There is a net force on the car, true

There is work being done on the car, true

## đź“š Related Questions

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Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and average velocity?
Solution 1
Total distance = 4 km + 3 km + 5 km = 12km

total time = 1.5 hours

velocity = distance/time
v = 12/1.5
v = 8 km/h

speed = distance/time
s = 12/1.5
s = 8

hope this helps :)

Question
Matthew is a soil scientist. He has been hired to determine why there is a soil drainage problem near a neighbor's home. What steps would he need to complete to determine the types of soils present near his neighbor's home if he finds the soil is mostly clay? Prepare a recommendation plan to improve the soil drainage for his neighbor based on the results.
Solution 1
Step 1. he would need to know how much soil was being drained, step 2 he would need to measure whatever was draining the soil so he could stop it, and finally he would need to know how big the object would need to be.
Solution 2
Obviously clay is a material that won't let water drain through it, so the plan would be to substitute it with another material or to reduce the quantity of clay.
Question
A railroad car of 2000 kg coasting at 3.0 m/s overtakes and locks with an identical car coasting on the same track in the same direction at 2.0 m/s. What is the speed of the cars after they lock together?
Solution 1
The key is in "they lock together". This tells you this is a complete inelastic collision and therefore you can use the formula:
m1*v1+m2*v2=v(m1+m2)
Plug in numbers:
2000*3+2000*2=v(2000+2000)
so v=2 m/s, obviously in the same direction of motion in which they were both moving.
Question
Why do astronomers find it difficult to detect individual exoplanets?
Solution 1
Astronomers find it difficult to detect individual exoplanets because these planets are not bright enough compared to the stars they orbit.Â
Solution 2
Light from the stars, because the orbits make it difficult to see them.Â
Question
Suppose you were asked to demonstrate electromagnetic induction. Which of the following situations will result in an electric current? A. A magnet is moving toward a wire loop. B. A wire loop is moving away from a magnet. C. A wire loop is rotated near a magnet. D. All of the above
Solution 1
D. All of the above. When a wire loop is moved or rotated in a magnetic field, there is a change in magnetic flux which produces emf in wire loop and hence electric current is produced.Â
Solution 2
The answer is D. It is obvious since it is a one-choice question and both A and B state the exact same thing. Therefore the answer has to be D and so C has to be correct as well. Exam techniques! :D
Question
In which of the following sentences is work used in the scientific sense of the word? A scientist works on an experiment in the laboratory.* B Sam and Rachel pushed, but they could do no work on the car. ????
Solution 1
B) obviously. Work in a scientific sense is the ability to make a displacement on an object in this case.

In A) the scientist can work on an experiment as your uncle can work on the field planting tomatos.
Question
According the kinetic theory of matter, which of the following statements is true about matter
Solution 1
Hi

a. the atoms and molecules of a substance are always in motion
b. the higher the temperature of a substance, the faster its particles move
c. more massive particles move more slowly than less massive particles.

these are the main points of kinetic theory of matter.

Kinetic Theory of Matter
The kinetic theory of matter states that all matter is made of small particles that are in random motion and that have space between them. This means that no matter what phase matter is in, it is made of separate, moving particles.
This theory sounds pretty simple, but it actually explains a lot about the physical properties of matter and how it behaves. You might be surprised to learn that the particles of a solid are actually moving, just not enough for you to see. This type of vibrational movement is why a solid won't change shape no matter what kind of container you put it in.
Remember how liquid particles have more energy than solids? The extra energy in this state allows the particles to move around more freely, and they spread out more than those of a solid, putting more space between those particles. This is why a liquid will take the shape of its container up to its surface.
And since gases have even more energy than liquids, their particles are moving around a lot more, too. This is why a gas will expand to fill its entire container, not just to its surface like a liquid. Not only do the particles of a solid not move very much, but they're also held very close to each other by strong attractive forces. These forces are what hold the particles in place and are what give a solid its fixed size and shape.
On the other hand, the particles of a gas are so far apart that the attractive forces between them are assumed to be negligible. The particles of a gas are viewed as independent from each other, meaning that the gas is the opposite of a solid and has neither a fixed size nor shape.
Since the movement of liquid particles is in between a solid and a gas, the attractive forces between its particles are also in a middle range of the other two phases. Liquid particles have more freedom than solid particles, which is why a liquid can flow freely. This means that like a gas, a liquid has no fixed shape. But because the particles aren't quite as free as those of a gas, a liquid does have a fixed volume.

Question
Ball A has mass 5.0 kg and is moving at -3.2 m/s when it strikes stationary ball B, which has mass 3.9 kg, in a head-on collision. If the collision is completely inelastic, what is the common velocity of balls A and B?
Solution 1
Momentum conservation in a completely inelastic collision works like this:
mA*vA+mB*vB=v(mA+mB)

Since B was initially stationary pB=0.
Plugging in numbers gives:
5*(-3.2)=v(5+3.9)
v= -1.79 m/s to the left.

Solution 2

A.) Â -0.40 m/s

B.) -3.60 m/s

C.) -1.80 m/s

Explanation:

By the law of momentum conservation:-

=>m1u1 + m2u2 = m1v1 + m2v2 Â

=>5 x (-3.2) + 0 = 5v1 + 3.9v2

=>1.28v1 + v2 = -4.10 ---------------(i) Â

for elastic collision:-

=>v1 - v2 = u2 - u1 Â

=>v1 - v2 = 0 - (-3.2)

=>v1 - v2 = 3.2 ------------------(ii) Â

by (i) + (ii) :-

=>2.28v1 = -0.90

=>v1 = -0.40 m/s

=>v2 = -3.60 m/s

(c) By the law of momentum conservaation:-

=>m1u1+m2u2 = (m1+m2)v

=>5 x (-3.2) + 0 = (5 + 3.9) x v

=>v = -1.80 m/s

Question
The root word terra means â€ślandâ€ť or â€śterritory.â€ť Terrestrial planets are the planets closest to the Sun. Why are they are called terrestrial planets?
Solution 1
A Terrestrial plant, Tell-uric planet, or rock planet is a planet that is composed primarily of silicate rocks or metals.
Solution 2

They are made of rock and metal.

Explanation:

The planets closest to the Sun are called terrestrial planets because they are made of rock and metal. Plato

Question
How did scientists discover the Earth had a liquid outer core and solid inner core?
Solution 1
Dr. Inge discovered the make up of the earths inner core by studying how an earthquakes waves bounced off the core. And Inge Lehmann was studying the waves of a 1929 earthquake when she found them acting inconsistently with solid mantle crustÂ
hope it helps you

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