(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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.

2. Relevant equations

Fnet=ma

Ffriction-mg*coefficient friction

3. 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!

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# Homework Help: Fnet=ma (kind of confusing question please help)

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