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QJEEM21Phcd48: JEE Main 2021 Physics - Class 11 JEEM21Phcd48 Solution: Wires W 1 and W 2 are made of same material having the breaking …

Wires W1 and W2 are made of same material having the breaking stress of 1.25 ×\times 109 N/m2. W1 and W2 have cross-sectional area of 8 ×\times 10 −- 7 m2 and 4 ×\times 10 −- 7 m2, 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 m/s2)

JEE Main 2021 (Online) 27th August Evening Shift Physics - Properties of Matter Question 155 English

Step-by-Step Verified Solution

B.S1 = T1max⁡8×10−7{{{T_{1\max }}} \over {8 \times {{10}^{ - 7}}}} ⇒\Rightarrow T1 max = 8 ×\times 1.25 ×\times 100 = 1000 N

B.S2 = T2max⁡4×10−7{{{T_{2\max }}} \over {4 \times {{10}^{ - 7}}}} ⇒\Rightarrow T2 max = 4 ×\times 1.25 ×\times 100 = 500 N

m = 500−10010=40{{500 - 100} \over {10}} = 40 kg

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