Question
What is the radius (in cm) of the tyre in a car, if it covers 0.396 km in 300 rotations? (Use π = 227)
Answer: Option B
:
B
The circumference of the tyre = 2πr (Distance travelled in each rotation)
Total Distance = Distance covered in 1 rotationx Number of rotations
⇒0.396=2×227×r×300
⇒r=0.396×72×22×300
Hence r =0.00021km or 21cm.
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:
B
The circumference of the tyre = 2πr (Distance travelled in each rotation)
Total Distance = Distance covered in 1 rotationx Number of rotations
⇒0.396=2×227×r×300
⇒r=0.396×72×22×300
Hence r =0.00021km or 21cm.
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