Work, Energy and Power

Related Questions

• Two bodies of masses 2m and m have their K.E. in the ratio 8 : 1, then their ratio of momenta is

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• Two particles having position vectors $\overrightarrow {{r_1}} = (3\hat i + 5\hat j)$ metres and $\overrightarrow {{r_2}} = ( - 5\hat i - 3\hat j)$ metres are moving with velocities ${\overrightarrow v _1} = (4\hat i + 3\hat j)\,m/s$ and ${\overrightarrow v _2} = (\alpha \,\hat i + 7\hat j)$ $m/s.$ If they collide after 2 seconds, the value of $'\alpha '$ is

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• A body of mass m moving with a constant velocity v hits another body of the same mass moving with the same velocity v but in the opposite direction and sticks to it. The velocity of the compound body after collision is

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• A block of mass m initially at rest is dropped from a height h on to a spring of force constant k. the maximum compression in the spring is x then

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• If the heart pushes 1 cc of blood in one second under pressure 20000 N/m2 the power of heart is

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