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# Block A in Fig weighs 2.40 N and block B weighs 3.60 N. ISBN: 9780321675460 31

## Solution for problem 73P Chapter 5

University Physics | 13th Edition

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Problem 73P

Block ?A? in Fig weighs 2.40 N and block ?B? weighs 3.60 N. The coefficient of kinetic friction between all surfaces is 0.300. Find the magnitude of the horizontal force necessary to drag block ?B? to the left at constant speed (a) if ?A? rests on B? and moves with it (Fig. 1). (b) If ?A? is held at rest (Fig. 2). Figure 1: Figure 2:

Step-by-Step Solution:

Solution 73P Step 1 of 3: The block is moving with constant speed so the acceleration is zero(a=0) a)Total weight of the two blocks,w = w + A = 6 B F =ya y n=w=6 N f = n = 1.8 N k k F =xa x n=w=6 N F = f k 1.8 N Step 2 of 3: b)n and f normal and friction forces applied to the block B by the table top are the k same. fkB is the friction force that A applies to B.it is to the right because the force from A opposes the motion of B, n isBthe downward force that A exerts on B . fkA is the friction force that B applies to A.it is to the left because the block B wants A to move with it. n is the normal force that block B exerts on A. A By newton’s third law fkB = f kA and these forces are in opposite direction. Also, n = A thesB forces are in opposite directions. F =ya foryblock A gives n = w = A.4 N,Ao n = 2.4 N B f = n = (0.3)(2.4) = 0.72 N, and f = 0.72 N kA k A kB F =xa forxblock A gives T=f kA =0.72 N F =xa forxblock B gives F=f kB + fk =0.72 N +1.8 N =2. 52 N

Step 3 of 3

##### ISBN: 9780321675460

Since the solution to 73P from 5 chapter was answered, more than 996 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: University Physics, edition: 13. The answer to “Block ?A? in Fig weighs 2.40 N and block ?B? weighs 3.60 N. The coefficient of kinetic friction between all surfaces is 0.300. Find the magnitude of the horizontal force necessary to drag block ?B? to the left at constant speed (a) if ?A? rests on B? and moves with it (Fig. 1). (b) If ?A? is held at rest (Fig. 2). Figure 1: Figure 2:” is broken down into a number of easy to follow steps, and 66 words. University Physics was written by and is associated to the ISBN: 9780321675460. This full solution covers the following key subjects: Block, fig, figure, weighs, drag. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. The full step-by-step solution to problem: 73P from chapter: 5 was answered by , our top Physics solution expert on 05/06/17, 06:07PM.

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