posted by Anonymous .
a 50kg object is suspended by a rope over a pulley which is connected to a large mass of 61.3kg. The mass rests on a 30 degree inclined ramp. The coefficient of kinetic friction between the block and the ramp is .15. What is the 50kg object's acceleration?
weight down the hill: 50g*SinTheta
friction on the plane= 50g*mu*CosTheta
now, assuming the block is going up the hill (friction in the direction of downhill)..
solve for a.
would the acceleration be negative?
Yes, if it is defined positive downhill. I believe Bob left on the coefficient of friction mu in the CosTheta term of the last equation.