The diameter of a wheel of a car is 30 cm. If the car travels at an average speed of 13.2m/s, find the number of revolutions made by the wheel per hour, giving your answer to the nearest whole number.
Answers
Speed of the car =66km/hr
∴ Distance travelled by the car in 1hr or 60 minutes is 66km
⇒ Distance travelled by the car in 10 minutes is
60
66
×10=11km=11×1000×100cm
Diameter of car wheel =60cm
∴ radius of car wheel =30cm
∴ Circumference of the wheel =2πr=2× 7=22
22 ×30= 1320 cm
We know that,
Circumference of the wheel = Distance travelled by the car when its wheels take one complete revolution =
7
1320
cm
∴ Number of revolutions made by wheels in 10minutes is given by
distance travelled by the car when its wheel stake one complete revolution.
distance travelled by the car 10 minutes =1320
11×1000×100
=
1320
77×1000×100
=5833 revolutions
∴ Number of revolutions made by wheels in 10 minutes is 5833 revolutions
Answer:
5833
Step-by-step explanation:
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