Q.

Two blocks of masses 1 kg and 2kg are connected by a metal wire going over a smooth pulley as shown. The breaking stress of the metal is . If g = 10ms–2. Then what should be the minimum radius of the wire used if it is not to break?

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a

0.5mm

b

2mm

c

1mm

d

1.5mm

answer is C.

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Two blocks of masses 1 kg and 2kg are connected by a metal wire going over a smooth pulley as shown. The breaking stress of the metal is . If g = 10ms–2. Then what should be the minimum radius of the wire used if it is not to break?