the radius of a front wheel of a car is 70 cm. how many revolutions per minute must the wheel make in order to maintain a speed of 66km per hour.
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radius of the wheel =70cm
circumference of the wheel =2×22/7×70 cm
=440cm
440cm (0.0044 km) are covered in 1 revolution
66 km are covered in= 1×66÷44/10000
or 1×66/44×10000
=15000 revolutions
circumference of the wheel =2×22/7×70 cm
=440cm
440cm (0.0044 km) are covered in 1 revolution
66 km are covered in= 1×66÷44/10000
or 1×66/44×10000
=15000 revolutions
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