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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