339_Physics ProblemsTechnical Physics

339_Physics ProblemsTechnical Physics - Chapter 11 *P11.44...

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Chapter 11 341 *P11.44 (a) KU s A s B += + bg 0 1 2 0 2 298 630 111 2 + == = mgy mv vg y AB BA .. . ±ms ±m 2 ej (b) Lm v r = × 76 5 32 10 3 kg 11.1 m s 6.3 m kg m s 2 . toward you along the axis of the channel. (c) The wheels on his skateboard prevent any tangential force from acting on him. Then no torque about the axis of the channel acts on him and his angular momentum is constant. His legs convert chemical into mechanical energy. They do work to increase his kinetic energy. The normal force acts forward on his body on its rising trajectory, to increase his linear momentum. (d) v r = v = ×⋅ = 532 10 76 12 0 3 . . kg m s kg 5.85 m ms 2 (e) W KU g B g C ++ = + 1 2 76 0 1 2 76 76 5 44 4 69 335 1 08 22 kg 11.1 m s kg 12.0 m s kg 9.8 m s 0.45 m kJ kJ J kJ 2 ++ = + =−+ = W W . (f) g C g D + 1 2 76 0 1 2 76 76 534 2 2 kg 12.0 m s kg kg 9.8 m s 5.85 m
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