A constestant in a winter games event pushes a 35.0kg rock acress a frozen lake

Question

A constestant in a winter games event pushes a 35.0kg rock acress a frozen lake with a force of 25.0N at 28degrees below the horizontal, and it moves with an acceleation of 0.630m/s^2 to the right.

a) What is the normal force exerted by the lake surface on the rock?

b) Instead of pushing on the rock, the contestant now pulls on it with a ropa over his shoulders at the same angle above the horizontal as in part a. Now what is the normal force exerted by the lake surface on the rock?

A constestant in a winter games event pushes a 35.0kg rock acress a frozen lake with a force of 25.0N at 28degrees below the horizontal, and it moves with an acceleation of 0.630m/s^2 to the right. What is the normal force exerted by the lake surface on the rock? Instead of pushing on the rock, the contestant now pulls on it with a ropa over his shoulders at the same angle above the horizontal as in part a. Now what is the normal force exerted by the lake surface on the rock?

Explanation / Answer

normal force N= F sin(28)+mg=354.73 N

normal force N= F sin(28)-mg=331.26 N

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