Quiz 7

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School

University Of Arizona *

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102

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Physics

Date

Dec 6, 2023

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Uploaded by CountAtomGiraffe8590

Question 1 (2 points) Saved Listen A 3.0-kg cart moving to the right with a speed of 1.0 m/s has a head-on collision with a 5.0-kg cart that is initially moving to the left with a speed of 2.0 m/s. After the collision, the 3.0-kg cart is moving to the left with a speed of 1.0 m/s. What is the final velocity of the 5.0-kg cart? Question 1 options: A) zero m/s B) 0.80 m/s to the left C) 0.80 m/s to the right D) 2.0 m/s to the right E) 2.0 m/s to the left Question 2 (2 points) Saved Listen 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? Question 2 options: A) +0.6 m/s B) +5.4 m/s C) +1.2 m/s D) +2.7 m/s E) +3.2 m/s Question 3 (2 points) Saved Listen

A 1000-kg car traveling east at 20 m/s collides with a 1500-kg car traveling west at 10 m/s. The cars stick together after the collision. What is the common velocity of the cars after the collision? Question 3 options: A) 16 m/s, east B) 6 m/s, west C) 4 m/s, east D) 2 m/s, east E) 1 m/s, west Question 4 (2 points) Saved Listen Complete the following statement: A collision is elastic if Question 4 options: A) the final velocities are zero. B) the objects stick together. C) the final kinetic energy is zero. D) the final momentum is zero. E) the total kinetic energy is conserved. Question 5 (2 points) Saved Listen A projectile is launched with a momentum of 200 kg • m/s and 1000 J of kinetic energy. What is the mass of the projectile? Question 5 options: A) 5 kg B) 10 kg C) 20 kg

D) 40 kg E) 50 kg Question 2 (2 points) Saved Listen 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. Question 2 options: A) zero N • s B) 2 N • s C) 4 N • s D) 20 N • s E) 200 N • s Question 3 (2 points) Saved Listen A 2.5-kg ball and a 5.0-kg ball have an elastic collision. Before the collision, the 2.5-kg ball was at rest and the other ball had a speed of 3.5 m/s. What is the kinetic energy of the 2.5-kg ball after the collision? Question 3 options: A) 1.7 J B) 3.4 J C) 8.1 J D) 14 J E) 27 J Question 4 (2 points)

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Saved Listen During hockey practice, two pucks are sliding across the ice in the same direction. At one instant, a 0.18-kg puck is moving at 16 m/s while the other puck has a mass of 0.14 kg and a speed of 3.8 m/s. What is the velocity of the center of mass of the two pucks? Question 4 options: A) 5.0 m/s B) 7.0 m/s C) 9.0 m/s D) 11 m/s E) 13 m/s Question 5 (2 points) Saved Listen While in Earth's orbit, an 80-kg astronaut carrying a 20-kg tool kit is initially drifting toward a stationary (relative to her) space shuttle at a speed of 2 m/s. If she throws the tool kit toward the shuttle with a speed of 6 m/s as seen from the shuttle, her final speed is Question 5 options: A) 1 m/s toward the shuttle. B) 1 m/s away from the shuttle. C) 2 m/s toward the shuttle. D) 4 m/s toward the shuttle. E) 6 m/s away from the shuttle.

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