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NEET 2009 (AIPMT) · Power

Power question from NEET 2009 (AIPMT)

Q45NEET 2009 · AIPMTMedium

Power

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

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Answer: (d)

Mass leaving per second $= mv$ .
Rate of KE given $= \dfrac{1}{2}(mv)v^2 = \dfrac{1}{2}mv^3$
So the answer is (d) $\dfrac{1}{2}mv^3$ .

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