Question 1

A sports car has an average acceleration of 13.1   .How long does it take for the car to reach 60.0 mi/h,if it starts from rest?

Accepted Answer

A) 4.6 s 
B) 5.5 s 
C) 3.1 s 
D) 8.8 s 
A) 4.6 s 
B) 5.5 s 
C) 3.1 s 
D) 8.8 s

Question 2

It is possible to have a negative average velocity,depending on the choice of coordinate system.Is it possible for an object to have a negative average speed?

Accepted Answer

No.An object's average speed m

Question 3

What quantity is measured by your speedometer (be as specific as possible)?

Accepted Answer

Your speedometer tel

Question 4

The plot below shows the position of an object as a function of time.The letters H-L represent particular moments of time.At which moment in time is the speed of the object equal to zero?

Accepted Answer

A) I 
B) H 
C) J 
D) K 
E) L 
A) I 
B) H 
C) J 
D) K 
E) L

Question 5

A train starts from rest and accelerates uniformly,until it has traveled 2.1 km and acquired a velocity of 24 m/s.The train then moves at a constant velocity of 24 m/s for 400 s.The train then slows down uniformly at 0.065 m/s2,until it is brought to a halt.The distance traveled by the train while slowing down,in km,is closest to:

Accepted Answer

A) 4.4 
B) 4.2 
C) 4.0 
D) 3.8 
E) 3.6 
A) 4.4 
B) 4.2 
C) 4.0 
D) 3.8 
E) 3.6

Question 6

The average velocity of a car over a certain time interval is 37 mi/h.If the velocity of the car was 65 mi/h at the end of this interval,what was its initial velocity? Assume that acceleration was constant.

Accepted Answer

A) 9 mi/h 
B) 13 mi/h 
C) 4.0 mi/h 
D) 57 mi/h 
A) 9 mi/h 
B) 13 mi/h 
C) 4.0 mi/h 
D) 57 mi/h

Question 7

Acceleration is sometimes expressed in multiples of g,where g = 9.8 m/s2 is the acceleration due to the earth's gravity.In a car crash,the car's velocity may go from 26 m/s to 0 m/s in 0.15 s.How many g's are experienced,on average,by the driver?

Accepted Answer

A) 18 g 
B) 13 g 
C) 22 g 
D) 23 g 
A) 18 g 
B) 13 g 
C) 22 g 
D) 23 g

Question 8

A car travels 95 km to the north at 70.0 km/h,then turns around and travels 21.9 km at 80.0 km/h.What is the difference between the average speed and the average velocity on this trip?

Accepted Answer

A) 27 km/h 
B) 19 km/h 
C) 32 km/h 
D) 24 km/h 
A) 27 km/h 
B) 19 km/h 
C) 32 km/h 
D) 24 km/h

Question 9

Negative acceleration is called deceleration because an object is slowing down.

Accepted Answer

A) True 
 B)False

Question 10

A toy rocket is launched vertically from ground level (y = 0 m),at time t = 0.0 s.The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 49 m and acquired a velocity of 60 m/s.The rocket continues to rise in unpowered flight,reaches maximum height,and falls back to the ground.The maximum height reached by the rocket is closest to:

Accepted Answer

A) 233 m 
B) 221 m 
C) 209 m 
D) 244 m 
E) 256 m 
A) 233 m 
B) 221 m 
C) 209 m 
D) 244 m 
E) 256 m

Question 11

Human reaction times are worsened by alcohol.How much farther would a drunk driver's car travel before he hits the brakes than a sober driver's car? Assume both cars are initially traveling at 49.0 mi/h,the sober driver takes .33 s,and the drunk driver takes 1.0 s to hit the brakes in a crisis.

Accepted Answer

A) 48 ft 
B) 34 ft 
C) 53 ft 
D) 58 ft 
A) 48 ft 
B) 34 ft 
C) 53 ft 
D) 58 ft

Question 12

The acceleration is always the slope of the "velocity versus time" graph and the velocity is always the slope of the "position versus time" graph.

Accepted Answer

A) True 
 B)False

Question 13

At the same moment,one rock is dropped and one is thrown downward with an initial velocity of 10 m/s from the top of a 300 m building.How much earlier does the thrown rock strike the ground? (Disregard air resistance. )

Accepted Answer

A) 0.95 s 
B) 0.66 s 
C) 0.85 s 
D) They land at exactly the same time. 
A) 0.95 s 
B) 0.66 s 
C) 0.85 s 
D) They land at exactly the same time.

Question 14

A racing car accelerates uniformly from rest along a straight track.This track has markers spaced at equal distances along it from the start,as shown below.The car reaches a speed of 140 km/h as it passes marker 2.   Whereabouts on the track was the car when it was travelling at half this speed,i.e.at 70 km/h?

Accepted Answer

A) before marker 1 
B) at marker 1 
C) between marker 1 and marker 2 
A) before marker 1 
B) at marker 1 
C) between marker 1 and marker 2

Question 15

A racquetball strikes a wall with a speed of 30 m/s and rebounds with a speed of 26 m/s.The collision takes 20 ms.What is the average acceleration of the ball during the collision?

Accepted Answer

A) zero 
B) 200 m/s2 
C) 2800 m/s2 
D) 1500 m/s2 
E) 1300 m/s2 
A) zero 
B) 200 m/s2 
C) 2800 m/s2 
D) 1500 m/s2 
E) 1300 m/s2

Question 16

A train starts from rest and accelerates uniformly,until it has traveled 5.6 km and acquired a velocity of 42 m/s.The train then moves at a constant velocity of 42 m/s for 420 s.The train then slows down uniformly at 0.065 m/s2,until it is brought to a halt.The acceleration during the first 5.6 km of travel is closest to:

Accepted Answer

A) 0.16 m/s2 
B) 0.14 m/s2 
C) 0.17 m/s2 
D) 0.19 m/s2 
E) 0.20 m/s2 
A) 0.16 m/s2 
B) 0.14 m/s2 
C) 0.17 m/s2 
D) 0.19 m/s2 
E) 0.20 m/s2

Question 17

Is there any situation in which the average velocity of an object can be greater than the object's average speed? Support your answer.

Accepted Answer

The average velocity can never

Question 18

A skier begins skiing straight down a hill having a constant slope,starting from rest.If friction is negligible,as the skier goes down the hill,his/her

Accepted Answer

A) acceleration is constant,with a value less than 10 m/s/s. 
B) acceleration is constant,with a value of roughly 10 m/s/s. 
C) acceleration increases with time. 
D) acceleration is zero. 
A) acceleration is constant,with a value less than 10 m/s/s. 
B) acceleration is constant,with a value of roughly 10 m/s/s. 
C) acceleration increases with time. 
D) acceleration is zero.

Question 19

Assuming equal rates of acceleration in both cases,how much further would you travel if braking from 56 mi/h to rest than from 28 mi/h?

Accepted Answer

A) 4 times farther 
B) 3.2 times farther 
C) 4.8 times farther 
D) 5.2 times farther 
A) 4 times farther 
B) 3.2 times farther 
C) 4.8 times farther 
D) 5.2 times farther

Question 20

A ball is thrown vertically upward and then comes back down.During the ball's flight up and down,its velocity and acceleration vectors are

Accepted Answer

A) always in opposite directions. 
B) always in the same direction. 
C) first in opposite directions and then in the same direction. 
D) first in the same direction and then in opposite directions. 
A) always in opposite directions. 
B) always in the same direction. 
C) first in opposite directions and then in the same direction. 
D) first in the same direction and then in opposite directions.

Exam 2: Motion in One Dimension

A sports car has an average acceleration of 13.1 .How long does it take for the car to reach 60.0 mi/h,if it starts from rest?

It is possible to have a negative average velocity,depending on the choice of coordinate system.Is it possible for an object to have a negative average speed?

What quantity is measured by your speedometer (be as specific as possible)?

The plot below shows the position of an object as a function of time.The letters H-L represent particular moments of time.At which moment in time is the speed of the object equal to zero?

The average velocity of a car over a certain time interval is 37 mi/h.If the velocity of the car was 65 mi/h at the end of this interval,what was its initial velocity? Assume that acceleration was constant.

Acceleration is sometimes expressed in multiples of g,where g = 9.8 m/s2 is the acceleration due to the earth's gravity.In a car crash,the car's velocity may go from 26 m/s to 0 m/s in 0.15 s.How many g's are experienced,on average,by the driver?

A car travels 95 km to the north at 70.0 km/h,then turns around and travels 21.9 km at 80.0 km/h.What is the difference between the average speed and the average velocity on this trip?

Negative acceleration is called deceleration because an object is slowing down.

Human reaction times are worsened by alcohol.How much farther would a drunk driver's car travel before he hits the brakes than a sober driver's car? Assume both cars are initially traveling at 49.0 mi/h,the sober driver takes .33 s,and the drunk driver takes 1.0 s to hit the brakes in a crisis.

The acceleration is always the slope of the "velocity versus time" graph and the velocity is always the slope of the "position versus time" graph.

At the same moment,one rock is dropped and one is thrown downward with an initial velocity of 10 m/s from the top of a 300 m building.How much earlier does the thrown rock strike the ground? (Disregard air resistance. )

A racquetball strikes a wall with a speed of 30 m/s and rebounds with a speed of 26 m/s.The collision takes 20 ms.What is the average acceleration of the ball during the collision?

Is there any situation in which the average velocity of an object can be greater than the object's average speed? Support your answer.

A skier begins skiing straight down a hill having a constant slope,starting from rest.If friction is negligible,as the skier goes down the hill,his/her

Assuming equal rates of acceleration in both cases,how much further would you travel if braking from 56 mi/h to rest than from 28 mi/h?

A ball is thrown vertically upward and then comes back down.During the ball's flight up and down,its velocity and acceleration vectors are

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Acceleration is sometimes expressed in multiples of g,where g = 9.8 m/s² is the acceleration due to the earth's gravity.In a car crash,the car's velocity may go from 26 m/s to 0 m/s in 0.15 s.How many g's are experienced,on average,by the driver?