Physics 1 Problem Solutions 86

Physics 1 Problem Solutions 86 - 82 Chapt 8 Potential...

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82 Chapt. 8 Potential Energy and Mechanical Energy a) 9 . 8 J. b) 19 . 6 J. c) 39 . 2 J. d) about 50 J. e) about 160 J. 008 qmult 00274 2 5 5 moderate thinking: girl on a swing KE/PE Extra keywords: physci KB-95-19 12. A girl on a swing oscillates between being 2 m off the ground where she is and 1 m off the ground where her speed is a . No nonconservative forces do work. What is her maximum speed? a) moving; minimum; 0 m / s. b) at rest; minimum; 0 m / s. c) at rest; maximum; 1 m / s. d) at rest; maximum; 2 . 4 m / s. e) at rest; maximum; 4 . 4 m / s. 008 qmult 00280 1 1 3 easy memory: bead on wire calculation 13. A bead is strung on a rigid, frictionless wire which is the near-Earth environment. At time zero, the bead height is y 0 = 10 . 0 m and the bead speed is v 0 = 15 . 0 m / s. The bead then moves along the wire. What is the bead spead when its height is y = 17 . 0 m? 008 qmult 00360 1 1 1 easy memory: turning points in a potential well
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