Question

a wheel of a car making 4 rev per sec . if the diameter of a wheel is 84 cm find its speed.answer is 38.016 km /hr​

Answer 1

answer is already given

Answer 2

Answer:

380.016 km/h

Step-by-step explanation:

Let r be the radius of the wheel. Then r= 84/2cm= 42cm

Circumference of the wheel= 2πr= 2×22/7×42cm= 264cm

Distance covered in 1 revolution= circumference= 263cm

: Distance covered in 4 revolution= 4×264cm= 1056cm= 10.56cm

Speed= Distance/Time= 10.56m/1second= 10.56×18/5 km/h

Hence, the speed of the wheel is 38.016 km/h

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