Two small balls of the same size, having masses m 1 and m 2 ( m 1 > m 2 ) are tied by a thin weightless thread and dropped from a certain height. Taking the force of buoyancy of air into account, the tension T in the thread during the f

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Two small balls of the same size, having masses m 1 and m 2 ( m 1 &#62; m 2 ) are tied by a thin weightless thread and dropped from a certain height. Taking the force of buoyancy of air into account, the tension T in the thread during the flight, after the motion of the ball becomes uniform, will be

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Correct answer: B. ( m 1 - m 2 ) g 2

As both the ball are of same size, force of buoyancy on each is same. Therefore, in equilibrium F + F = m 1 g + m 2 g or F = m 1 + m 2 g 2 Considering the equilibrium of lower ball, T + F = m 1 g T = m 1 g - F T = m 1 g - m 1 + m 2 g 2 T = m 1 - m 2 g 2

Two small balls of the same size, having masses m 1 and m 2 ( m 1 > m 2 ) are tied by a thin weightless thread and dropped from a certain height. Taking the force of buoyancy of air into account, the tension T in the thread during the flight, after the motion of the ball becomes uniform, will be

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