Question

A wheel makes 30 revolutions per minute. Its angular velocity increases to 60 revolutions per minute in 50 seconds. Calculate the angular acceleration in ∙ ି .

Answer 1

Explanation:

t=5s and θ=50rev

initial angular speed ω

o

=0

Comparing with linear motion s=

2

1

at

2

θ=

2

1

αt

2

⟹α=

5

2

2×50

⟹α=4rev/s

2

Again comparing with v=u+at and u=0

ω=α×t=4×5

⟹ω=20rev/s