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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 of at which kinetic energy is imparted to water?
Options
(a) mv²
(b) 1/2 mv²
(c) 1/2 m²v²
(d) 1/2 mv³
Correct Answer:
1/2 mv³
Explanation:
m : mass per unit length
rate of mass leaving the the hose per sec
= mx / t = mv.
Rate of K.E. = 1/2 (mv)v² = 1/2 mv³
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Topics: Work Energy and Power
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When photons of energy hν are incident on the surface of photosensitive
- When a charged oil drop moves upwards in an electric field,
- Three resistances 2Ω, 3Ω and 4Ω are connected in parallel. The ratio of currents passing
- The temperature coefficient of the resistance of a wire is 0.00125 per ⁰C.
- A nuclear reaction is given as 4 ₁H¹→₂He⁴+₀e¹+energy Mention the type of reaction.
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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