# PHYSICS

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?

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1. 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.

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2. the last term should be mg*mu(CosTheta).

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3. When you say mu, do you mean "meww"?

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posted by Jamie

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