The wheels of a car are of diameter 80cm each. How many complete revolutions does each wheel make in 10 min when the car is travelling at speed of 66km/hr??
Answers
Answer:
4375 resolutions..
Step-by-step explanation:
r=40cm=0.4m
for one revolution =2πr=2×22/7×0.4=17.6/7meters
speed of car 66km for 60 mints so for 10 mints 66/6=11km
so now qn is for 11km how many resolutions it will take
11000×7/17.6=4375 resolutions
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Answer:
4375 revolutions
Step-by-step explanation:
lets start,
Diameter of the circle= 80cm
so, radius =80/2cm
=40cm
Distance covered in one revolution =circumference of the circle
= 2*pi*r
=2*pi*40cm
=80picm
we know that,
speed=Distance/time
now we should find the total distance
Here, speed=66km
given time=10min=10/60hr=1/6hr
Lets come back to the formula
66=distance/1/6
Distance=66*1/6km
Distance=11km
therefore, Distance=11*1000*100cm
i.e, Distance=1100000cm
number of revolutions=total Distance/Distance covered in 1 revolution
=1100000/80pi
=1100000/80*22/7
=1100000*7/80*22
=4375
Hence,number of revolutions=4375