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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 |
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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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