Question

Calculate the period in seconds of a fan motor turns at
1200rpm.

Answer 1

Answer:

The angular velocities are given as,

ω

1

=1200rpm

ω

1

=40πrad/s

ω

2

=900rpm

ω

2

=30πrad/s

The angular acceleration is given as,

α=

2

40π−30π

α=5πrad/s

2

The angle is given as,

θ=ω

1

t+

2

1

αt

2

θ=40π×2+

2

1

×5π(2)

2

θ=90πrad

The numbers of revolutions are given as,

n=

2π

90π

n=45rev