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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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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A L-C-R circuit with L=1.00 mH, C=10μF and R=50Ω, is driven with 5 V AC voltage.
- A plane wave of wavelength 6250Å is incident normally on a slit of width 2×10⁻² cm.
- Two sources P and Q produce notes of frequency 660 Hz each.
- A satellite A of mass m is at a distance r from the centre of earth. Another satellite
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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