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Unformatted text preview: N exerted on the skier at point A . Summing forces in the normal direction NW cos 30 = m v 2 R Solving for N N = 180 32 . 2 80 2 150 + 180 cos 30 = 394 lb. 2 3. A ball of mass m = 2 kg is released from rest and falls 1 m before landing on a spring which is unstretched. After landing on the spring the ball continues to travel downward, compressing the spring .2 m before stopping. Determine the spring constant k . Using conservation of energy, m 2 v 2 1 + mgh 1 + 1 2 kS 2 1 = m 2 v 2 2 + mgh 2 + 1 2 kS 2 2 . Using the nal position as the datum point, h 1 = 1 . 2, h 2 = 0, S 1 = 0 and S 2 = . 2. The initial and nal velocities are zero, then solving for k , 2(9 . 81)(1 . 2) = 1 2 k ( . 2) 2 k = 1177 N/m. 3...
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 Spring '08
 N/A
 Dynamics

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