HSC Science (Computer Science) 12th Board ExamMaharashtra State Board
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The Spin Dryer of a Washing Machine Rotating at 15 R.P.S. Slows Down to 5 R.P.S. After Making 50 Revolutions. Find Its Angular Acceleration - HSC Science (Computer Science) 12th Board Exam - Physics

Question

The spin dryer of a washing machine rotating at 15 r.p.s. slows down to 5 r.p.s. after making 50 revolutions. Find its angular acceleration.

Solution

Given:

n1 = 15 r.p.s

n2 = 5 r.p.s

To find:

angular acceleration, α = ?

Formula:

alpha = (omega_2-omega_1)/t

Solution:

After 50 revolutions T = 1/50 = 0.02s

omega_1 = 2pin_1

omega_2 = 2pin_2

alpha = (omega_2-omega_1)/t

alpha = (2pin_2-2pin_1)/t

alpha = 2pi((n_2-n_1))/t

alpha = 2pi((15-5))/0.02

alpha = (2pixx10)/0.02

alpha = (2xx22xx10)/(7xx0.02)

α = 3142 rad/s2

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APPEARS IN

2014-2015 (March) (with solutions)
Question 2.7 | 2.00 marks

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Solution The Spin Dryer of a Washing Machine Rotating at 15 R.P.S. Slows Down to 5 R.P.S. After Making 50 Revolutions. Find Its Angular Acceleration Concept: Angular Acceleration.
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