The diameter of the wheel of a vehicle is 5metre it makes 7 revolutions per 9seconds what is speed of vehicle in km/h
Answers
Step-by-step explanation:
C of wheel = πd = 22/7 × 5 = 110/7
Distance covered in 9sec = 110/ 7 ×7 = 110 m
speed per second = 110 / 9
1 sec = 12.2 m
1 hrs = 3600 sec
distance in 1 hr = 3600 × 12.2
= 44000 m
= 44 KM
44 km/hr
Answer:
44 kilometres / hour
Step-by-step explanation:
consider # to be pi
perimeter of circle = 2#r
r = d/2 = 5/2 metres
perimeter of circle = 2 * # * r
= 2 * 22/7 * 5/2
= 110/7
9 seconds = 9/3600 hours = 1/400 hours
we know that distance covered by a wheel ( or any circular object ) if we are given its perimeter and number of revolutions, is perimeter * number of revolutions
so, in 1/400 hours ( 9 seconds ), distance covered = perimeter of circle * number of revolutions
= 110/7 * 7 ( where 7 is number of revolutions )
= 110 metres
= 110/1000 kilometres = 11/100 kilometres
speed = distance/time
= ( 11/100 ) / ( 1/400 )
= ( 11/100 ) * 400
=11 * 4
=44 kilometres per hour
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