Question

A cyclist is riding a bicycle whose wheels have a diameter of 60 centimetres. Suppose he is travelling at 21 kilometres per hour.
Find the angular speed of the wheels in radians per minute.
Find the number of revolutions the wheels make per minute.

Answer 1

Answer:

Given,

r=21cm

So, distance covered in one rotation is 2πr

= 2*3.14*21

= 131.88cm

Rpm =600

So

Distance covered in a minute

= 600*131.88

= 791.28m/min

Convert this to kmph

=(791.28/1000)/(1/60)

=47.5 kmph

Answer 2

Step-by-step explanation:

Given,

r=21cm

So, distance covered in one rotation is 2πr

= 2*3.14*21

= 131.88cm

Rpm =600

So

Distance covered in a minute

= 600*131.88

= 791.28m/min

Convert this to kmph

=(791.28/1000)/(1/60)

=47.5 kmph