A spring balance reads W 1 when a ball is suspended from it. A weighing machine reads W 2 when a tank of liquid is kept on it. When the ball is immersed in the liquid, the spring balance reads W 3 and the weighing machine reads W 4 .
Text Solution
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(a, c)
W 1 , W 3 are the forces exerted by the ball and the spring balance on each other before and after immersion.
W 2 , W 4 are the forces exerted by the tank and the weighing machine on each other before and after
immersion.
Let m and M be the masses of the ball and the tank respectively, and let N be the force of interaction
between the ball and the liquid in the tank.
W 1 = mg W 2 = Mg W 3 + N = mg W 4 = N + Mg
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