This is a problem about pushing a packing crate up a ramp. The worker pushing th

Question

This is a problem about pushing a packing crate up a ramp. The worker pushing the crate plans to push parallel to the surface of the ramp (NOT horizontally, which is parallel to the surface of the Earth). The problem begins with the crate lying on the ramp (the crate is at rest), not being touched by the worker. For reporting component directions in this problem, use a coordinate system which is parallel or perpendicular to the surface of the ramp. The possible parallel directions are "Up the Ramp" or "Down the Ramp", and the possible perpendicular directions are "Into the Ramp" and "Away from the Ramp".

The mass of the crate is 115 kg. The ramp makes an angle of 7 degrees with the horizontal.

This is a problem about pushing a packing crate up a ramp. The worker pushing the crate plans to push parallel to the surface of the ramp (NOT horizontally, which is parallel to the surface of the Earth). The problem begins with the crate lying on the ramp (the crate is at rest), not being touched by the worker. For reporting component directions in this problem, use a coordinate system which is parallel or perpendicular to the surface of the ramp. The possible parallel directions are "Up the Ramp" or "Down the Ramp", and the possible perpendicular directions are "Into the Ramp" and "Away from the Ramp". The mass of the crate is 115 kg. The ramp makes an angle of 7 degrees with the horizontal. When the worker is pushing with a force of 450.55 N, she finds that the crate finally just starts to move. What is the coefficient of static friction between the crate and the surface of the ramp. Once the crate has started to move, the worker finds that she can keep the crate moving up the ramp at a constant speed, if she pushes with a force of 365.99 N. What is the frictional component of the contact force on the crate by the ramp at this moment? What is the coefficient of kinetic friction between the crate and the surface of the ramp.

Explanation / Answer

oo lengthy for 300 pts..plzz raise

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