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y3ahright
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Homework Statement
a block of mass m resting on a 20° slope. The block has coefficients of friction µs = 0.80 and µk = 0.49 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass m2 = 2.0 kg.
What is the minimum mass m that will stick and not slip?
Homework Equations
Newtons second law sum of the forces = mass * acceleration
The Attempt at a Solution
I used the hanging block to find the tension to be equal to 9.8*(2) = 19.6 N
With that found I found that n = mgSin(20) and T = µs * mgSin(20)
So 19.6 = .8*m 9.8Sin(20) and m = 7.309 kg
The online homework says this is incorrect and I have no idea of any other way to go about this problem any help is appreciated.
Thanks