Question

the wheel of a car are of diameter 80 cm each how many complete Revolution does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?

Answer 1

Car diameter id 80 cm Or 0.8 m
So radius of wheel=0.4 m OR 4/10 m
Lenght of one revolution = Circumference Of the wheel
= 2πr
=2*22/7*4/10
=(44*4)/70m

Speed of Car = 66km\hr or 66000m\hr
Time given 10 min. Or 1/6 hrs
Total distance covered by the car
in 1/6hrs
Speed = Dist/Time
Dist=Speed*Time
= 66000*(1/6)m
=11000m
Since the car cover 11000 m in 10 min

So No of revolution taken = Distance Covered/Distance covered by 1 revolution(i.e. Circumference of wheel)
=11000/(44*4)/70
=770000/176
=4375 revolutions
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Answer 2

Answer:

circumference of wheel = 251.2 cm =2.51 m

speed car = 66km/h = 1100m/min

therefore, number of revolution in 10 min = 10×1100= 11000 revolutions.

hope it helped :)