exam 2 fall 2010

# exam 2 fall 2010 - QUESTION 1 This and the next question...

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Unformatted text preview: QUESTION 1* This and the next question refer to the following situation: Two ice skaters of mass 70 kg and 50 kg, each having an initial velocity of 10 m/s in the directions shown, collide and fall and slide across the ice together. The ice surface is horizontal and frictionless. What is the speed of the skaters after the collision? (a) V = 0 m/s (b) V = 1.7 m/s (c) V = 2.7 m/s (d) V = 10 m/s (e) V = 20 m/s QUESTION 2* What is the angle θ relative to the x axis that the two skaters travel after the collision? (a) θ ; = 41° (b) θ = 28° (c) θ = 25° QUESTION 3* This and the next three questions refer to the following situation: A cart of mass M = 9 kg rolls without friction on a horizontal surface. It is attached through a freely pivoting initially-horizontal massless rod of length L to a ball of mass m = 3 kg. The system is initially at rest when the ball is released. The pendulum swings down and to the left, and at the bottom of its swing the ball is observed to have a velocity of 3.5 m/sec to the left. Which one of the following remain constant as the pendulum swings down? (a) horizontal component of the momentum of the ball (b) horizontal component of the momentum of the cart (c) horizontal component of the momentum of the ball + cart QUESTION 4* What is the speed of the cart when the ball is at the bottom? (a) V cart = 1.17 m/s (b) V cart = 1.75 m/s (c) V cart = 2.44 m/s (d) V cart = 2.91 m/s (e) V cart = 3.37 m/s QUESTION 5** What is the length L of the pendulum? (a) 0.59 m (b) 0.83 m (c) 1.18 m QUESTION 6** How far to the right has the cart moved, when the ball is at the bottom?How far to the right has the cart moved, when the ball is at the bottom?...
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exam 2 fall 2010 - QUESTION 1 This and the next question...

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