A wheel of radius 21cm made 1000 rotations in 12min. Find the speed of the wheel?
a) 6.6kmph b) 6.2kmph
c) 13.2kmph d ) 3.3 kmph
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Answer:
6.6 kmph
Explanation:
Speed = Distance / Time
= (Thousand time circumference of wheel) / Time
= (1000 × 2πr) / T
= (1000 × 2 × 22/7 × 21 cm) / (12 min)
= 11000 cm/min
= 11000 × 10^-5 km / (1/60 hr)
= 11000 × 10^-5 × 60 kmph
= 6.6 kmph
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