An engine pumps water continuously through a hose. Water leaves the hose...

Q.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?

AIPMT/NEET 2009 | W.P.E Q 1 | This type of qus  requires our ability of converting any known formula, in terms of given variables . For ex. Here we need to convert kinetic energy per unit time in terms of given mass per unit length and velocity . For that we will divide mass by time in the formula of kinetic energy per unit time and then we will put value of this mass as a product of mass per unit length and length. As we know length per unit time is velocity so finally we will get the desired result. Watch closely and try to learn these conversion techniques . My word of advice , do not try to attempt such qus in competition paper ( like Neet ) if you are not very good at these.

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