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hw7

# hw7 - Homework No 7 Calculating work CHANG 1 The 2 Kg...

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Homework No. 7 Calculating work F θ A B 2 m 1.5 m CHANG 1 The 2 Kg collar slides up the smooth vertical rod from A to B under the action of the constant force F = 50 N with angle θ = 30 ˚ as shown. The collar is attached to a linear spring that has a spring constant k = 24 N/m and an unstretched length of 1.6 m. Find (a) the work done by the 50 N force, (b) the work done by gravity, and (c) the work done by the spring. Ans : (a) 65.0 J (b) –29.4 J (c) –7.8 J CHANG 2 A linear spring ( k = 2000 N/m) with an unstretched length of 1.5 m is attached to the 50 Kg block as shown. A constant horizontal force F = 250 N is applied as shown on the block as the block moves from A to B along the ramp. The coefficient of friction on the surface is μ k = 0.5 between the block and the incline. Find the work done (a) by the applied force F , (b) by gravity, (c) by friction, (d) by the
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