The speed of sound is nearly 341m/s, if a car of wheel radius 70 cm moves with a speed of sound. Find the number of revolutions it will make in 10 sec.

Asked by Topperlearning User | 31st May, 2016, 08:51: AM

Expert Answer:

Let n be the number of revolution a wheel makes in 10 sec.

 
The distance travelled by the wheel  in 10 sec is 3410 m
 
Therefore, n x  = 3410
 
 
rightwards double arrow n equals fraction numerator 3410 over denominator 2 πr end fraction equals fraction numerator 3410 cross times 7 over denominator 2 cross times 22 cross times 0.7 end fraction equals 775 space r e v o l u t i o n s

Answered by  | 31st May, 2016, 10:51: AM