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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
- A boy whirls a stone in a horizontal circle of radius 1.5 m and at height 2.0 m
- A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
- How much work is required to carry a 6 μC charge from the negative terminal
- The de-Broglie wavelength of neutron in thermal equilibrium at temperature T is
- At what distance from the centre of earth, the value of acceleration due to gravity
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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