Q: An object moving in the $$+x$$ direction experiences an acceleration of $$+2.0\ \text{m/s}^2. $$This means the object:

Is increasing its velocity by $$2.0\ \text{m/s}$$ every second.

Q: A light-year is the distance that light travels in one year. The speed of light is $$3.00 \times 10^8$\ \text{m/s}. $$How many miles are there in one light-year? ($$1\ \text{mi} = 1.609\ \text{km}$$, $$1\ \text{yr} = 365\ \text{d})$$

$$5.88 \times 10$$^{12}$$\ \text{mi}$$

Question 1

A ball is thrown straight up with no air resistance. What is the acceleration at its highest point?

Accepted Answer

It is downward.

Question 2

If the velocity versus time graph of an object is a straight line making an angle of $$-30^\	ext{o} ($$counterclockwise) with the time axis, the object is:

Accepted Answer

Moving with constant non-zero acceleration.

Question 3

The slope of a velocity versus time graph gives:

Accepted Answer

Acceleration.

Question 4

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time $$T to $$reach the ground, what time will it take the 10-kg rock to reach the ground?

Accepted Answer

$$T$$

Question 5

Consider a deer that runs from point A to point B. The distance the deer runs can be greater than the magnitude of its displacement, but the magnitude of the displacement can never be greater than the distance it runs.

Accepted Answer

True

Question 6

When is the average velocity of an object equal to the instantaneous velocity?

Accepted Answer

When the velocity is constant

Question 7

Suppose a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?

Accepted Answer

The acceleration is toward the east.

Question 8

Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point?

Accepted Answer

Exactly $$g$$

Question 9

If the acceleration of an object is zero, then that object cannot be moving.

Accepted Answer

False

Question 10

Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their acceleration is correct?

Accepted Answer

The two bricks have exactly the same acceleration.

Question 11

A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start. The car reaches a speed of $$140\ 	ext{km/h} as it $$passes marker 2. Where on the track was the car when it was traveling at half this speed, that is at $$70\ 	ext{km/h}$$?

Accepted Answer

Between marker 1 and marker 2

Question 12

An object moving in the $$+x$$ direction experiences an acceleration of $$+2.0\ 	ext{m/s}^2. $$This means the object:

Accepted Answer

Is increasing its velocity by $$2.0\ 	ext{m/s}$$ every second.

Question 13

A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct?

Accepted Answer

Its acceleration is constant.

Question 14

An object is moving with constant non-zero acceleration in the $$+x$$ direction. The position versus time graph of this object is:

Accepted Answer

A parabolic curve.

Question 15

If the velocity of an object is zero at one instant, what is true about the acceleration of that object?

Accepted Answer

The acceleration could be negative.

Question 16

Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object.

Accepted Answer

The displacement is either less than or equal to the distance traveled.

Question 17

A car is traveling with a constant speed of $$30.0\ 	ext{m/s}$$ when the driver suddenly applies the brakes, causing the car to slow down with a constant acceleration. The car comes to a stop in a distance of $$120\ 	ext{m}. $$What was the acceleration of the car as it slowed down?

Accepted Answer

$$-7.5\ 	ext{m/s}^2$$

Question 18

A light-year is the distance that light travels in one year. The speed of light is $$3.00 	imes 10^8$\ 	ext{m/s}. $$How many miles are there in one light-year? ($$1\ 	ext{mi} = 1.609\ 	ext{km}$$, $$1\ 	ext{yr} = 365\ 	ext{d})$$

Accepted Answer

$$5.88 	imes 10$$^{12}$$\ 	ext{mi}$$

Question 19

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is $$41\ 	ext{m}$$, how long will it take for the stone to hit the water? Neglect air resistance.

Accepted Answer

$$2.9\ 	ext{s}$$

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