Question

The diameter of motorcycle's wheel is 70 cm.if it makes 40 revolutions in 10 sec. then find the speed in km/h

Answer 1

Explanation:

In this type of question, we will first calculate the distance covered in given time.

 

Distance covered will be : Number of revolutions x Circumference 

 

So we will be having distance and time, from which we can calculate the speed. 

 

Radius of wheel = 70 / 2 = 35 cm

 

Distance covered in 40 revolutions will be 40*circumferene=40*2πr=40*2*227*35=8800cm = 88 m

 

Distance covered in 1 sec  = 8810=8.8m/s=8.8*185km/hr=31.68km/hr
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Answer 2

Diameter of wheel 70 cm
Perimeter is 22÷7*70= 220 cm
Distance covered in 40 revolution 220*40 = 8800 cm
If it can travel 880 cm in 10 sec then in 1 sec 880 ÷ 10 = 88 cm
When converted 88*60*60/1*100000
= 3.16 kmph
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