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Step-by-step explanation:
Radius of the wheel =r=42 cm (given)
Circumference of wheel = Circumference of circle = 2πr=2×
7
22
×42=264
Circumference of wheel is 264 cm.
Again, distance travelled by wheel = 19.8 km=1980000 cm (Convert km into cm)
Now, number of revolutions taken by a wheel = 1980000/264=7500
Given:-
Radius of Wheel = 0.35 m
Distance covered by wheel = 5.5 km
Solution:-
Circumference of the wheel = 2πr
= 2 × × 0.35 m
= 2.2 m
Convert Distance To m from km
1 km = 1000 m
5.5 km = 5,500 m
Now, Rotations made by wheel =
= 2,500 revolution
∴ Total number of Rotation done by wheel to cover 5.5 km is 2,500.
Some Important Formula:-