Question 1

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about

Accepted Answer

A)   2 seconds.
B)   10 seconds.
C)   20 seconds.
D)   1 second.
E)   not enough information to estimateF) B) and D)
G) A) and B)

Question 2

If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance)  will be

Accepted Answer

A)   greater than 9.8 meters per second per second.
B)   less than 9.8 meters per second per second.
C)   9.8 meters per second per second.D) None of the above
E) All of the above C

Question 3

When a rock thrown straight upwards gets to the exact top of its path, its

Accepted Answer

A)   velocity is about 10 m/s and its acceleration is about 10 meters per second per second.
B)   velocity is about 10 m/s and its acceleration is zero.
C)   velocity is zero and its acceleration is about 10 meters per second per second.
D)   velocity is zero and its acceleration is zero.
E)   none of theseF) B) and E)
G) A) and B)

Question 4

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of

Accepted Answer

A)   (100 - 4.9)  m.
B)   100 m.
C)   (100 + 4.9)  m.
D)   4.9 m.
E)   none of theseF) B) and E)
G) All of the above A

Question 5

An object, at rest near the surface of a distant planet, starts to fall freely . If the acceleration there is twice that of the earth, its speed one second later would be

Accepted Answer

A)   40 m/s.
B)   10 m/s.
C)   20 m/s.
D)   30 m/s.E) B) and C)
F) A) and B)

Question 6

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about

Accepted Answer

A)   four times as much.
B)   half as much.
C)   twice as much.
D)   the same.E) None of the above
F) A) and D)

Question 7

Starting from rest, the distance a freely-falling object will fall in 0.5 second is about

Accepted Answer

A)   1 m.
B)   1.00 m.
C)   10 m.
D)   none of the aboveE) All of the above
F) B) and C)

Question 8

A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is

Accepted Answer

A)   about 120 m/s.
B)   about 30 m/s.
C)   about 60 m/s.
D)   more than 120 m/s.E) A) and D)
F) A) and C)

Question 9

An airplane flies at 100 km/h in still air.. If it flies into a 10 km/h headwind, its groundspeed is

Accepted Answer

A)   90 km/h.
B)   120 km/h.
C)   110 km/h.
D)   100 km/h.E) B) and D)
F) A) and C)

Question 10

If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about

Accepted Answer

A)   2 seconds.
B)   10 seconds.
C)   1 second.
D)   not enough information to estimateE) A) and C)
F) All of the above

Question 11

While an object near the earth's surface is in free fall , its

Accepted Answer

A)   velocity increases.
B)   acceleration increases.
C)   mass increases.
D)   mass decreases.E) B) and C)
F) A) and C)

Question 12

Which of the following is not a vector quantity?

Accepted Answer

A)   speed
B)   velocity
C)   acceleration
D)   All are vector quantities.E) C) and D)
F) B) and C)

Question 13

Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the
Greater speed will be

Accepted Answer

A)   the one thrown downward.
B)   the one thrown upward.
C)   neither - they will both hit with the same speed.D) All of the above
E) B) and C)

Question 14

A ball is thrown 125 meters upward and then falls the same distance back to Earth. Neglecting air resistance, its total time in the air is

Accepted Answer

A)   about 5 seconds.
B)   about 15 seconds.
C)   about 10 seconds.
D)   more than 20 seconds.E) All of the above
F) B) and C)

Question 15

Galileo's use of inclined planes allowed him to effectively

Accepted Answer

A)   eliminate the acceleration of free fall.
B)   increase the acceleration beyond that of free fall.
C)   slow down the acceleration of free fall.
D)   eliminate friction.E) A) and B)
F) All of the above

Question 16

In each second of fall, the distance a freely falling object will fall is

Accepted Answer

A)   about 5 m.
B)   the same, but not 5 m or 10 m.
C)   about 10 m.
D)   increasing.
E)   none of these.F) A) and C)
G) A) and D) D

Question 17

While a car travels around a circular track at a constant speed its

Accepted Answer

A)   acceleration is zero.
B)   inertia is zero.
C)   velocity is zero.
D)   none of the aboveE) B) and C)
F) C) and D)

Question 18

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second per second

Accepted Answer

A)   is less than 9.8.
B)   is more than 9.8.
C)   is 9.8.
D)   depends on the height of the cliff.E) A) and B)
F) None of the above

Question 19

Consider drops of water that leak at a steady rate from a dripping faucet. As the drops fall they

Accepted Answer

A)   get closer together.
B)   remain at a relatively fixed distance from one another.
C)   get farther apart.D) All of the above
E) B) and C)

Question 20

A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, two seconds later the rock's speed is

Accepted Answer

A)   zero.
B)   9.8 m/s.
C)   4.9 m/s.
D)   14.7 m/s.
E)   none of the above.F) A) and C)
G) A) and B)

Exam 3: Equilibrium and Linear Motion

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about

Correct AnswerverifiedShow Answer

If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be

Correct AnswerverifiedC

When a rock thrown straight upwards gets to the exact top of its path, its

Correct AnswerverifiedShow Answer

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of

Correct AnswerverifiedA

An object, at rest near the surface of a distant planet, starts to fall freely . If the acceleration there is twice that of the earth, its speed one second later would be

Correct AnswerverifiedShow Answer

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about

Correct AnswerverifiedShow Answer

Starting from rest, the distance a freely-falling object will fall in 0.5 second is about

Correct AnswerverifiedShow Answer

A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is

Correct AnswerverifiedShow Answer

An airplane flies at 100 km/h in still air.. If it flies into a 10 km/h headwind, its groundspeed is

Correct AnswerverifiedShow Answer

If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about

Correct AnswerverifiedShow Answer

While an object near the earth's surface is in free fall , its

Correct AnswerverifiedShow Answer

Which of the following is not a vector quantity?

Correct AnswerverifiedShow Answer

Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the Greater speed will be

Correct AnswerverifiedShow Answer

A ball is thrown 125 meters upward and then falls the same distance back to Earth. Neglecting air resistance, its total time in the air is

Correct AnswerverifiedShow Answer

Galileo's use of inclined planes allowed him to effectively

Correct AnswerverifiedShow Answer

In each second of fall, the distance a freely falling object will fall is

Correct AnswerverifiedD

While a car travels around a circular track at a constant speed its

Correct AnswerverifiedShow Answer

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second per second

Correct AnswerverifiedShow Answer

Consider drops of water that leak at a steady rate from a dripping faucet. As the drops fall they

Correct AnswerverifiedShow Answer

A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, two seconds later the rock's speed is

Correct AnswerverifiedShow Answer

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