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Unformatted text preview: 92 Energy Problems 1. A cart of mass 1.8 kg rolls without friction on the track shown. At point A the cart is moving at 6.0 m/s. Find the speed of the car at points B and C. 2. The same track is used, but now there is friction acting. When the cart reaches point B it has a speed of 1.40 m/s. What work was done by friction? 3. A mass m = 0.60 kg is attached to a spring of constant k = 75 N/m and the system is hung vertically. Initially the mass is pulled down, stretching the spring by x = 12 cm, and you throw the mass with an initial velocity v = 1.8 m/s. (a) Find the speed of the spring when it returns to its relaxed state. (b) Find the lowest and highest points that the mass reaches. 4. A block of mass m = 3.0 kg is attached to a spring of constant k = 240 N/m. It can slide along a board tilted at an angle theta = 37° to the horizontal. Initially the block is released from rest when the spring is compressed by x = 30 cm. (a) Find the speed of the block when the spring is relaxed again....
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.
- Fall '09