Work, Energy and Power

Related Questions

• A spring of spring constant 5 ? 103 N/m is stretched initially by 5cm from the unstretched position. Then the work required to stretch it further by another $5cm$ is

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• Power of a water pump is 2 kW. If $g = 10\,m/{\sec ^2}$, the amount of water it can raise in one minute to a height of 10 m 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 10 H.P. motor pumps out water from a well of depth 20m and fills a water tank of volume 22380 litres at a height of 10m from the ground. the running time of the motor to fill the empty water tank is $(g = 10m{s^{ - 2}}$)

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• A body of mass 3 kg is under a force, which causes a displacement in it is given by $S = \frac{{{t^3}}}{3}$ (in m). Find the work done by the force in first 2 seconds

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