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PHY7AW10practice-q3 - ward Use the fact that E tot = KE PE...

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1. Sophie throws a tennis ball down from a height of 1.5 m at an angle of 45 0 with respect to vertical. She drops another tennis ball from the same height. Use the Energy Interaction Model to predict which ball will hit the ground with greater speed. 2. A vertical spring, spring constant 3000 N/m, and with a 200 g weight attached is pushed up 14 cm from equilibrium. a. What is the work done? What is the PE at this point? b. The mass is then released. What is the speed of the weight when it is 10 cm above the equilibrium moving up-
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Unformatted text preview: ward? Use the fact that E tot = KE + PE to state whether this speed is greater than, less than, or equal to its speed as it passes through the equilibrium position. 7A-2C Quiz 3 DL Sec. ___ Name _____________________ __________________ last first for office use only I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature _____________________________ KE = mv 2 /2 PE g = mgy PE m-s = kx 2 /2 F m-s = -kx W = ∫ F • dx...
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