Homework Help: physics

Posted by Anonymous on Sunday, November 28, 2010 at 7:43pm.

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?

physics - bobpursley, Sunday, November 28, 2010 at 7:46pm
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)..

61.3g-50g*sinTheta-50g*CosTheta=mass*a
solve for a.
physics - Anonymous, Sunday, November 28, 2010 at 7:50pm
would the acceleration be negative?
physics - drwls, Sunday, November 28, 2010 at 7:59pm
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.

Answer this Question

Related Questions

Physics - An object of mass M rests on a horizontal table and is connected to a ...
physics - An object with mass m1=5.00 kg rests on a frictionless horizontal ...
physics - An object with mass m1=5.00 kg rests on a frictionless horizontal ...
Physics - An object with mass m1 = 6.00 kg, rests on a frictionless horizontal ...
physics - An object with mass m1 = 5.00 kg, rests on a frictionless horizontal ...
physics - A light rope is attached to a block with a mass of 6 kg that rests on ...
PHYSICS - A CRATE OF MESS 50KG IS LYING ON A 30DEGREE INCLINE, A STEEL BALL OF ...
physic - An object with mass m1 = 5.00 kg, rests on a frictionless horizontal ...
physic - An object with mass m1 = 5.00 kg, rests on a frictionless horizontal ...
physics - "By means of a rope, whose mass is negligible, two blocks (mass: ...

For Further Reading

First Name:
School Subject:
Answer: