A crate slides down a 35o ramp with constant speed. What is the coefficient of kinetic friction between the crate and the ramp?

Explanation:

The formula for calculating the coefficient of kinetic friction between the crate and the ramp is expressed as;

η = F/R

F is the frictional force

R is the normal reaction

since F = mgsinθ (Force acting parallel to the ramp)

R = mgcosθ

Substitute into the formula

η = mgsinθ/mgcosθ

η = sinθ/cosθ

η = tanθ

Given

θ = 35°

η = tan35°

η = 0.7

Hence the coefficient of kinetic friction between the crate and the ramp is 0.7

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archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it