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Physics - Center of Mass Question with Solution | TestHub

PhysicsCenter of MassMomentum conservationMedium3 minQB

PhysicsMediumsingle choice

Passage / Comprehension

As shown in figure there is a small bob having mass 1 kg is attached to the string having negligible mass. Bob is released as shown in figure. Initially when spring is in natural length. (g = 10 m/s $^{2}$ )

Find the total work done by the friction in above two problems?

Options:

Answer:

Solution:

First problem (3 kg block over 0.96 m): $W_{1} = - \frac{4}{30} (3) (10) (0.96) = - 3.84 J$ . Second problem (3.1 kg over 1.92 m): $W_{2} = - \frac{4}{30} (31) (1.92) = - 7.94 J$ . Total $= - 3.84 - 7.94 \approx - 11.7 J$ . Answer: (B)

Stream:JEESubject:PhysicsTopic:Center of MassSubtopic:Momentum conservation

⏱ 3mℹ️ Source: QB

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