Question

The radius of a wheel is 0.42 metre. It takes 750 rotation in a minute. Its speed will be equal to

Answer 1

Explanation:

Radius = 42cm.

No of revolution = 750 / min

No of revolution = 750× 60 / hour

Now,

Circumference = 2 π r

⇒ 2 × 22 / 7 × 42

⇒ 44 × 6

⇒ 264cm

We have ,

no. of revolution= circumference/distance

⟹distance=750×60×264

⟹distance=11880000cm

⟹distance= 11880 km

∴distance=11880km

Speed = distance / time

⇒ speed = 11880km / 1 hour

⇒ speed = 11880 km/hr.

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