(Answered) 1 what force is required to drag a sack of rice weighing

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1. What force is required to drag a sack of rice weighing 105 lb if the coefficient of friction is 0.25?

(a) when the force is parallel to the surface,

(b) when the force makes 37° above the horizontal.

2. A piano weighing 600 lb is to be raised to a platform 4 ft high through a plank 10 ft long. If the coefficient of friction is 0.30, what force parallel to the plank will be needed?

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