Question 149
Each wheel of a car is making 5 revolutions per second. If the diameter of a wheel is 84 cm, then the speed of the car in cm/sec. would be
Solution
Radius of wheel = $$\frac{84}{2}=42$$ cm
Distance covered in 1 revolution = Circumference of wheel = $$2\pi r$$
= $$2\times\frac{22}{7}\times42$$
= $$44\times6=264$$ cm
=> Distance covered in 1 second = $$264\times5=1320$$ cm
$$\therefore$$ Speed of car = $$1320$$ cm/sec
=> Ans - (B)
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