Question

The radius of a wheel of a car is 0.6m.It makes 140 revolutions in a minute.Find the speed of the car.​

Answer 1

Answer:

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The diameter of a wheel of a bus is 90cm ,so radius=45cm

=>circumference=2πr

. =2*22/7*45

. =2*22/7*45/100000

(converting it in kilometres)

Now,revolution per minute are 315...

=>2*22/7*45/100000*315

=2*22/7*45/100000*315*60

(per minute)

=>37422000/700000

=>53.46 km/h

Answer 2

Answer:

250 is answer

Step-by-step explanation:

Speed of the bus = 66 km/hr

Distance covered by the wheel in one minute =

60

66×1000×100

=110000 cm

Circumference of the wheel = 2×

7

22

×70=440 cm

Therefore, distance covered by the wheel in one revolution = 440 cm

Hence, number of revolutions in one minute =

440

110000

=250