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Struggling with Physics please help!

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A 2kg box slides down a ramp a distance of two meters before it reaches the ground. The ramp has an angle of 30o. The coefficient of kinetic friction for the ramp is 0.1.

What is the work done by the normal force on the box?

I was under the impression for a ramp problem I would use w cos sin to solve for normal force? However, the book uses f cos zeta and gets the answer zero. Is this correct?

The other problem is asking
A fluid is flowing through a pipe from left to right. If you...

Struggling with Physics please help!

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