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Exam3-practice

# Exam3-practice - Physics 211 Spring 2007 Practice before...

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Phy211 Spring 2007 Syracuse University Practice before Exam 3 Page 1 Physics 211, Spring 2007 Practice before Exam 3 1. [40pts total] Two carts of mass m 1 =3 kg and m 2 =5 kg are attached to each other. There is a compressed spring in between them. The spring constant is k=3500 N/m. The carts are moving on frictionless track. Initially they are moving with velocity of 1.5 m/s to the right. Then the carts are disconnected. They separate as the spring is allowed to decompress. After the separation, velocity of the cart with mass m 2 is 3.0 m/s to the right. 1a. [20pts] Find final velocity (magnitude and direction) of the cart with mass m 1 after the separation. m 1 m 2 1.5 m/s m 2 m 1 3.0 m/s v 1f = ? before after

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Phy211 Spring 2007 Syracuse University Practice before Exam 3 Page 2 1b. [20pts] Find compression of the spring ( x) before the cart separation (you will need to solve 1a first).
Phy211 Spring 2007 Syracuse University Practice before Exam 3 Page 3 2. [15pts] Find center-of-mass of the ladder shown below (i.e. calculate x and y coordinates of the center-of-

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