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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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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- C and Si both have same lattice strcture, having 4 bonding electron in each
- The internal energy change in a system that has absorbed 2 kcals of heat
- If a magnetic substance is brought near the north or the south pole of a bar magnet
- A heavy stone hanging from a massless string of length 15 m is projected
- Two discs of moment of inertia I₁ and I₂ and angular speeds ?￢ﾂﾁ and ?￢ﾂﾂ are rotating
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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