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Most Important Selected Qs for JEE AdvancedPhysicsMechanical Properties of Solids

Wires W 1 and W 2 are made of same material having the breaking stress of 1 . 25 × 10 9   N   m - 2 .   W 1 and W 2 have cross-sectional area of 8 × 10 - 7   m 2 and 4 × 10 - 7   m 2 , respectively. Masses of 20   kg and 10   kg hang from them as shown in the figure. The maximum mass that can be placed in the pan without breaking the wires is _____ kg (Use g = 10 &#16

Correct answer

40

Step-by-step solution

F 1 max =   stress   ×   area = 1 . 25 × 8 × 10 2 = 1000   N F 2 max = 500   N F 2 max = ( 10 + M ) g = 500   N M = 40   kg

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