Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 5 - Force and Motion-I - Problems - Page 120: 56b

Answer

Force Fa = 30 N

Work Step by Step

Case 1 Acceleration of the system a = Fa/(ma+mb) a = Fa/12 Given that the force between the blocks is 20N 20 = mb Fa /12 240 = Fa (mb) eq (1) Case 2 Acceleration of the system a = Fa/(ma+mb) a = Fa/12 Given that the force between the blocks is 10N so 10 = ma Fa /12 120 = Fa (ma) eq(2) From both equations we have 360 = F ( ma+mb) 360 = Fa x 12 Fa = 30 N
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