ek bus ke pahiye ki radius 0.75 meter hai aur vo 1/2 minute me 84 round pure kr leta hai tab us pahiye ki speed km/h me batao
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sabse phele pahiye ka circumference nikalenge
c = 2r
let pi = 3.14
c= 2 * 3.14 * 0.75 m
=4.71 m
ab circumference ko 84 se multiply karenge total distance nikalne ke liye
d= c * 84
= 4.71 * 84 m
=395.64 m
time = 1/2 min = 30 secs
distance = 395.64 m
therefore, speed = d/t
=395.64/30
=13.188 m/sec
=13.188 * 3.6
=47.4768 km/h
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now if the tyre completes 1 round it covers a distance 2πr because it is rolling on its edge
so
84 rounds means
distance = 84×(2πr) = 84(2)(22/7)(3/4) = 396 m = 0.396 km
time = 1/2 minute = 1/120 hours.....(divided by 60)
now speed = distance / time
speed= ( 0.396 / (1/120) ) km/hr
so
speed is 47.52 km/hr