1.

The wheel of a car has 210 cm diameter. How many revolutions per minute must the wheel make so that the speed of the car is kept at 120 km/h?1. 326.422. 2453. 2894. 303.03

Answer» Correct Answer - Option 4 : 303.03

Given:

Diameter if wheel,D = 210 cm = 2.1 m

Speed of car, v = 120 km/hour

Formula used:

V = (πDN)/60

V → speed, D → diameter, N → number of revolution

Calculatioon:

V = (πDN)/60

⇒ 120 × 5/18 = (π × 2.1 × N)/60

1 km/hour = 5/18 m/s

⇒ N = (120 × 5 × 60)/(18 × 2.1 × π)

⇒ N = 303.03

∴ Revolution of wheel in a minute is 303.03



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