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: 13a

Answer

4 kg

Work Step by Step

Looking first at disk A, we can see that there are 3 forces acting on it. The Tension from the large rope is pulling upwards, (call this T) and then T1 is pulling downards, as is the weight of the disk, Ma*g We know that the acceleration of disk A = 0 because it is not moving and so the net force on A is also zero. Therefore we have 0 = T - T1 - Ma*g. We know that T = 98N and T1 = 58.8N, therefore Ma*g = 98 - 58.8 = 39.2N. g = 9.81, so therefore Ma = 4 kg
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