Problem D5:
An object, of mass m and radius R, rolls without slipping down an incline plane.
The incline makes an angle θ with the horizontal, where sin θ = 1/n_{2}.
The rotational intertia divided by mR^{2} of the rolling object is equal
to I/(mR^{2}) = 2/n_{1}. What is the frictional force that the
incline exerts on the rolling object? If the frictional force equals
f = mg/n_{3}, what is n_{3}?
Note that for a thin ring, n_{1}=2; for a uniform disk, n_{1}=4;
and for a sphere, n_{1}=5. Also,
n_{1}, n_{2}, and n_{3} are unitless.

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