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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

(a) What is the minimum force of friction required to hold the system of Figure P4.74 in equilibrium? (b) What coefficient of static friction between the 100.-N block and the table ensures equilibrium? (c) If the coefficient of kinetic friction between the 100.-N block and the table is 0.250, what hanging weight should replace the 50.0-N weight to allow the system to move at a constant speed once it is set in motion?

images

Figure P4.74

(a)

To determine
The minimum friction force.

Explanation

Given Info: The weight of the blocks are 100 N and 50 N. The co-efficient of kinetic friction is 0.250.

For the hanging block, the tension in the rope (T) is equal to the weight of the block.

T=50N

For the upper block, the tension in the rope equal the friction force ( Fs )

(b)

To determine
The co-efficient of static friction.

(c)

To determine
The weight of the block.

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