Box 1 of mass m1 = 25:0 kg rests on a rough horizontal surface. It is connected

Question

Box 1 of mass m1 = 25:0 kg rests on a rough horizontal surface. It is connected by a massless string across a
massless, frictionless pulley to a second box that sits on a frictionless inclined plane. The plane is inclined at
an angle of = 30 above the horizontal. The coecient of static friction between box 1 and the horizontal
surface in s = 0.25.
8. What is the heaviest that the second box can weigh before the system begins to move?
(a) 3.13 N
(b) 12.5 N
(c) 30.6 N
(d) 61.2 N
(e) 123 N
Sorry i couldnt get the picture on here

Explanation / Answer

F=w sin 30 -.25m1g=0 so w= 122.5=123 N

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