Answered: 300 FIS) 101b Ms 0 15 MK=0.1 Find work… | bartleby

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300
FIS)
101b
Ms=0.15
MK=0.1
Find work done by friction (ft-lb) after the block is pushed 6ft
6ft
F
501b1
* ellipse
6ft S
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'1. A 40KG box initially at rest is pushed for 5.0m along a rough horizontal floor by a constant horizontally applied force of 130 N. If the coefficient of frietion between the box and the floor is 0.30, find; a) the work done by the applied force, b) the energy lost due to friction, c) the change in kinetic energy of the box, d) the final speed of the box.
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1. A 23.0 kg child is playing on a swing with a length of 2.5 m. If the swing starts from rest and makes an angle of 40.0◦ with the vertical at the top of the swing, a) determine the child’s speed at the bottom of the swing neglecting friction. b) If the swing has a speed of 2.8 m/s at the bottom, determine the work done by friction during the downswing and, bonus) assuming the force of friction is constant, determine the maximum angle the swing attains on the upswing after passing through the bottom. Hint: Use the approximation that cos θ ≈ 1 − 1 2 θ 2 for angles given in radians.
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