A 50-kg toboggan is coasting on level snow.As it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in the toboggan.If KE1 is the original kinetic energy of the toboggan and KE2 is the kinetic energy after the parcel has been added, what is the ratio KE2/KE1.

A) 0.4 B) 0.6 C) 0.7 D) 0.8 E) 1 A) 0.4 B) 0.6 C) 0.7 D) 0.8 E) 1

Exam 7: Impulse and Momentum

A 50-kg toboggan is coasting on level snow.As it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in the toboggan.If KE₁ is the original kinetic energy of the toboggan and KE₂ is the kinetic energy after the parcel has been added, what is the ratio KE₂/KE₁.

(Multiple Choice)

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Question 61

The head of a hammer (m = 1.5 kg) moving at 4.5 m/s strikes a nail and bounces back with the same speed after an elastic collision lasting 0.075 s.What is the magnitude of the average force the hammer exerts on the nail?

(Multiple Choice)

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Question 62

A 7.30-kg bowling ball strikes a 1.60-kg pin at rest head-on.Before the collision, the velocity of the ball is +6.00 m/s.After the collision, the velocity of the ball is +5.40 m/s.What is the velocity of the pin after the collision?

(Multiple Choice)

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Question 63

A 0.2-kg steel ball is dropped straight down onto a hard, horizontal floor and bounces straight up.The ball's speed just before and just after impact with the floor is 10 m/s.Determine the magnitude of the impulse delivered to the floor by the steel ball.

(Multiple Choice)

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Question 64

The drawing shows two 4.5-kg balls located on the y axis at 1.0 and 9.0 m, respectively, and a third ball with a mass 2.3 kg which is located at 6.0 m.What is the location of the center of mass of this system?

(Multiple Choice)

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Question 65

Showing 61 - 65 of 65

A 50-kg toboggan is coasting on level snow.As it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in the toboggan.If KE₁ is the original kinetic energy of the toboggan and KE₂ is the kinetic energy after the parcel has been added, what is the ratio KE₂/KE₁.

The head of a hammer (m = 1.5 kg) moving at 4.5 m/s strikes a nail and bounces back with the same speed after an elastic collision lasting 0.075 s.What is the magnitude of the average force the hammer exerts on the nail?

A 7.30-kg bowling ball strikes a 1.60-kg pin at rest head-on.Before the collision, the velocity of the ball is +6.00 m/s.After the collision, the velocity of the ball is +5.40 m/s.What is the velocity of the pin after the collision?

A 0.2-kg steel ball is dropped straight down onto a hard, horizontal floor and bounces straight up.The ball's speed just before and just after impact with the floor is 10 m/s.Determine the magnitude of the impulse delivered to the floor by the steel ball.

The drawing shows two 4.5-kg balls located on the y axis at 1.0 and 9.0 m, respectively, and a third ball with a mass 2.3 kg which is located at 6.0 m.What is the location of the center of mass of this system?

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