Question 1

Figure 6-1, an Olympic diver dives off the high-diving platform. 
 
-See Figure 6-1. After leaving the platform, the diver's momentum will be least at which point?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D

Question 2

Two cars collide head-on on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

Accepted Answer

A)  It was never zero. 
B)  It was not initially zero, but ended up zero. 
C)  It was always zero.

Question 3

A golf ball traveling 3 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

Accepted Answer

A)  slightly greater than 3 m/s. 
B)  much less than 3 m/s. 
C)  equal to 3 m/s. 
D)  slightly less than 3 m/s.

Question 4

From the graph, determine the change in momentum after 10 seconds of a 100. kg object.

Accepted Answer

A)  -100. N-s 
B)  75.N-s 
C)  -25.N-s 
D)  25.N-s 
E)  -75.N-s

Question 5

A crane lifts up a 100. kg box, from rest, with a force that varies with time, as shown on the graph.

What is the instantaneous velocity of the box at t = 10. s?

Accepted Answer

A)  +0.25 m/s 
B)  +0.75 m/s 
C)  -0.25 m/s 
D)  zero 
E)  -0.75 m/s

Question 6

A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. Neglecting the effects due to digging in of cleats

Accepted Answer

A)  the linebacker will drive the halfback backward. 
B)  the halfback will drive the linebacker backward. 
C)  neither player will drive the other backward. 
D)  this is a simple example of an elastic collision.

Question 7

Consider the Sun and its largest planet Jupiter. Where on the line joining them is their center mass? Is it within or outside the Sun? (Sun-Jupiter avg distance 778.million km; Solar mass/Jupiter mass = 1.0 × 10³; Solar diameter 1.4 million km)

Accepted Answer

The answer of Consider the Sun and its largest planet...

Question 8

A 30. kg child stands at one end of a floating 20. kg canoe that is 10. ft long. The child walks to the other end of the canoe. How far does the canoe move in the water assuming water friction is negligible?

Accepted Answer

A)  4.0 ft 
B)  2.0 ft 
C)  8.0 ft 
D)  10. ft 
E)  6.0 ft

Question 9

A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000. N. If the hose delivers 40. liters per second, what is the maximum velocity of the stream needed, assuming the water doesn't bounce back?

Accepted Answer

A)  50. m/s 
B)  25 m/s 
C)  15. m/s 
D)  40. m/s 
E)  30. m/s

Question 10

Figure 6-1, an Olympic diver dives off the high-diving platform. 
 
-See Figure 6-1. The magnitude of his momentum will be a maximum at which point (A, B, C or D)?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D

Question 11

Some automobiles have air bags installed on their dashboards as a safety measure. The impact of a collision causes the bag to inflate, and it then cushions a passenger's head when he is thrown forward in the car. Suppose that such a bag could lengthen the collision time between one's head and the dashboard by a factor of 10. What effect would this have on the force exerted on the head?

Accepted Answer

A)  The force would be reduced by a factor of about 100. 
B)  The force would be reduced by a factor of about 1000. 
C)  The force would be reduced by a factor of about 10. 
D)  The force would be reduced by a factor of about 3. 
E)  The force would not be reduced, but the energy transferred to the head would be, thereby minimizing the damage done.

Exam 6: Linear Momentum and Collisions

Figure 6-1, an Olympic diver dives off the high-diving platform. -See Figure 6-1. After leaving the platform, the diver's momentum will be least at which point?

Two cars collide head-on on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

A golf ball traveling 3 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

From the graph, determine the change in momentum after 10 seconds of a 100. kg object.

A crane lifts up a 100. kg box, from rest, with a force that varies with time, as shown on the graph. What is the instantaneous velocity of the box at t = 10. s?

A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. Neglecting the effects due to digging in of cleats

Consider the Sun and its largest planet Jupiter. Where on the line joining them is their center mass? Is it within or outside the Sun? (Sun-Jupiter avg distance 778.million km; Solar mass/Jupiter mass = 1.0 × 10³; Solar diameter 1.4 million km)

A 30. kg child stands at one end of a floating 20. kg canoe that is 10. ft long. The child walks to the other end of the canoe. How far does the canoe move in the water assuming water friction is negligible?

A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000. N. If the hose delivers 40. liters per second, what is the maximum velocity of the stream needed, assuming the water doesn't bounce back?

Figure 6-1, an Olympic diver dives off the high-diving platform. -See Figure 6-1. The magnitude of his momentum will be a maximum at which point (A, B, C or D) ?

Exam 6: Linear Momentum and Collisions

Figure 6-1, an Olympic diver dives off the high-diving platform. -See Figure 6-1. After leaving the platform, the diver's momentum will be least at which point?

Two cars collide head-on on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

A golf ball traveling 3 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

From the graph, determine the change in momentum after 10 seconds of a 100. kg object.

A crane lifts up a 100. kg box, from rest, with a force that varies with time, as shown on the graph. What is the instantaneous velocity of the box at t = 10. s?

A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. Neglecting the effects due to digging in of cleats

Consider the Sun and its largest planet Jupiter. Where on the line joining them is their center mass? Is it within or outside the Sun? (Sun-Jupiter avg distance 778.million km; Solar mass/Jupiter mass = 1.0 × 103; Solar diameter 1.4 million km)

A 30. kg child stands at one end of a floating 20. kg canoe that is 10. ft long. The child walks to the other end of the canoe. How far does the canoe move in the water assuming water friction is negligible?

A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000. N. If the hose delivers 40. liters per second, what is the maximum velocity of the stream needed, assuming the water doesn't bounce back?

Figure 6-1, an Olympic diver dives off the high-diving platform. -See Figure 6-1. The magnitude of his momentum will be a maximum at which point (A, B, C or D) ?

Consider the Sun and its largest planet Jupiter. Where on the line joining them is their center mass? Is it within or outside the Sun? (Sun-Jupiter avg distance 778.million km; Solar mass/Jupiter mass = 1.0 × 10³; Solar diameter 1.4 million km)