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Homework Statement
A block weighing 73.7 N rests on a plane inclined at 24.3° to the horizontal. The coefficient of the static and kinetic frictions are 0.28 and 0.11 respectively.
A.) What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping?
B.) What is the minimum magnitude of F that will start the block moving up the plane?
C.) What is the magnitude of F is required to move the block up the plane at constant velocity?
Homework Equations
w = 73.7
theta = 24.3
Mus = 0.28 (Don't know how to make that little symbol lol)
Muk = 0.11
The Attempt at a Solution
A.) F = w sin theta - Mus*wcos theta = 11.52 N
B.) F = fs + wx
Fmin = Mus*wcos theta + wsin theta = 49.14 N
C.) F = Wx + fk
fk = Muk*N = 7.3889
Wx = fs + F = 11.775 + 11.52
fs = Mus*wcos theta
Part C I don't think is right but I don't know what I am doing wrong?