Homework Help: Physics

Posted by Sierra on Wednesday, July 11, 2012 at 10:45am.

A crate of mass 29 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 25 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp is
μK = 0.22.
What is the work done by the person as he pushes the crate up the ramp?

Physics - Elena, Wednesday, July 11, 2012 at 1:22pm
W=ΔPE+W(fr)=
=m•g•Δh+μ•m•g•cosα•s=
=m•g•s•sinα+μ•m•g•cosα•s=
=m•g•s(sinα + μ•cosα)

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