- #1
laddoo12
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Homework Statement
In the diagram below are two blocks. Block A sitting on top of block B has a mass mA = 10.0 kg and is attached to the wall by massless string. Block B, mass mB = 35.0 kg, is pulled by a force F = 75.0 N. The surface under block B is frictionless. The coefficients of friction for block A and B are μs = 0.34 and μk = 0.17.
(a) Determine the acceleration of block B.
(b) Determine the tension in the string.
Homework Equations
Fnet=ma
Ffriction-mg*coefficient friction
The Attempt at a Solution
For the first part i went
fnet=ma
Ft=(m1+m2)a+M*g*μk
75=45a+35*9.8*.17
a=41.68/45
a=.37 m/s^2
Not sure if i am doing this correct, the coefficient of static friction is confusing me, do i need it in this equation?
Part B
Fnet=ma
Ft=Ffriction+Ffstatic
Ft=.37*35*.17+35*.34*9.8
ft=118.82N (seems right not sure)
I am not fully confident in my work an answers can someone tell me if idid this correct, i have no answers unfortunately given to me. Please tell me if i went wrong somewhere or not thank you!