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The angular velocity of a wheel increases from 100 rps to 300 rps in 10 seconds. The number of revolutions made during that time is
Options
(a) 600
(b) 1500
(c) 1000
(d) 2000
Correct Answer:
2000
Explanation:
Assuming constant angular acceleration,
α=2πx300-2πx100/10
=2πx200/10
=40 π radius/s²
ω²f-ω²i=2α.θ
θ=4π²(90000-10000)/2×2πx20
=2π(80000)/40
=2πx2000
.·. Total number of revolutions=2000.
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(73)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An iron rod of volume 10⁻⁴ m³ and relative permeability 1000 is placed inside a long
- The conducting loop in the form of a circle is placed in a uniform magneitc field
- If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly
- A plane electromagnetic wave of frequency 20 MHz travels through a space along
- Two particles are oscillating along the same line with the same frequency
Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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Average rate = (100+300)/2 = 200 rotation per second
In 10 second rotation = 200×10=2000