Homework Help: PHYSICS

Posted by Bob on Sunday, October 19, 2008 at 9:43pm.

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?

PHYSICS - bobpursley, Sunday, October 19, 2008 at 9:47pm
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.
- PHYSICS - bobpursley, Sunday, October 19, 2008 at 9:48pm
  the last term should be mg*mu(CosTheta).

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