Asked by Bob

A block is on a 24 degree incline, with a rope attached to a spring at the top of the ramp which has a spring constant of 65 N/m. If the spring is stretched 1.3 m, the coefficient of friction is 0.01, and the acceleration of the block is 0.35 up the incline, what is the mass of the block?
Answered by bobpursley
You have spring force upward, part of the weight of the block downward (mgsinTheta), and frictiondownward mg*mu*cosTheta.

The vector sum of those is equal to mass*acceleration.

kx-mgsinTheta-mgCosTheta=ma
solve for m.
Answered by bobpursley
the last term should be mg*mu(CosTheta).
Answered by Jamie
When you say mu, do you mean "meww"?
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