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Question

Two blocks of masses 1 kg and 2 kg are connected by a metal wire going over a smooth pulley as shown in the figure. The breaking stress of the metal is (10/3π)×106 N/m2. If g=10 m/s2, then what should be the minimum radius of the wire used if it is not to break?

A
0.5 mm
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B
1.5 mm
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C
1 mm
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D
2 mm
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Solution

The correct option is D 2 mm
Tension in the string, T=2m1m2m1+m2g=2×1×21+2×10=403 N
If r is the minimum radius, then
Breaking stress =40/3πr2
103π×106=403πr2
r2=4106
r=2103 m=2 mm

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