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PhysicsW.E.P.PowerMedium2 minPYQ_2012

PhysicsMediumsingle choice

An engine pumps water continuously through a hose. Water leaves the hose with velocity $v$ and $m$ is mass per unit length of the water jet. If this jet hits a surface and came to rest instantaneously, the force on the surface is

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Answer:

Solution:

As power $P = F . v . = \frac{F ℓ}{t}$ $or, v (M \frac{v}{t}) = \frac{F . ℓ}{t} \Rightarrow M v^{2} = F ℓℓ \Rightarrow F = \frac{M}{ℓ} v^{2} = m v^{2} [∵ \frac{M}{ℓ} = m (given)]$

Stream:JEESubject:PhysicsTopic:W.E.P.Subtopic:Power

⏱ 2mℹ️ Source: PYQ_2012

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