6. On way to one morning, an evil chemistry professor notices an bag dangling ne

Question

6. On way to one morning, an evil chemistry professor notices an bag dangling next to the science building, hanging by a (massless) thread. The chemistry professor cries, but through her tears she sees the thread is running over a massless, frictionless pulley mounted to the edge of the horizontal roof. She pulls a periscope out of her back pocket and uses it to determine that the massless rope is attached to a concrete block sitting on the roof as shown in the diagram below. If the mass of the concrete block is 250 kg and the coefficient of static friction between the and the concrete block is o 58, what is the minimum force the evil professor must apply to the bag in order to overcome static friction and lower the cats to safety?

Explanation / Answer

let,

mass, m1=80 kg,

mass, m2=250 k

us=0.58

required downward force is F

F=us*N-m1*g

F=us*m2*g-m1*g

F=0.58*250*9.8-80*9.8

F=637 N

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