Friction and Pulley

  • #1
Hello everyone.... I need ur help in the following problem

Homework Statement


A perfect rope connects a 20 kg block to a 30 kg block. The rope passes over a perfect
pulley at the top of a 53 ° incline. The 30 kg block rests on the incline and the 20 kg
block hangs from the pulley. The blocks start from rest. Calculate the acceleration of
either block. (µ = 0.2)

Homework Equations


F=ma
Fk= N*uk

The Attempt at a Solution


http://img832.imageshack.us/img832/1134/26881976.jpg [Broken]

the correct answer is is 0.0688 m/sec^2
Please help me to find the error in my solution
 
Last edited by a moderator:

Answers and Replies

  • #2
PhanthomJay
Science Advisor
Homework Helper
Gold Member
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506
You had the correct approach and equations...but then you seemed to have reversed your m1, m2, g, and a terms. Recheck your math. Sometimes it is better to plug in the numbers right away up front, to avoid the messy algebra. But don't tell the math folks i said that:wink:
 

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