A mass of 2 kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, if we want the tension in the string to be doubled, then the new speed should nearly be

Question

A mass of 2 kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant, if we want the tension in the string to be doubled, then the new speed should nearly be, 2 . 25 rpm, 7 rpm, 10 rpm, 14 rpm

MARKS App · Accepted Answer

F = m ω 2 r = mr 2 n π 2 thus F × n 2 n = resolution per second. thus 2 F F = n ′ n 2 or n ′ = 2 n = 5 2 rpm = 7 rpm

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