Question

. A wheel whose radius is 50 cm is turning at a speed of 300 revolution per min. Find the speed in km per hour of a point on the rim of the wheel .

(a)22π (b)20π (c)18π (d)16π​

Answer 1

Answer:

The correct answer is c. 18π.

Step-by-step explanation:

Total distance covered in a revolution= 2πr cm

where r= radius of wheel

Total distance covered in 300 revolution

=300× 2πr cm = 300 ×2π×50 cm

=(300 ×2π×50)/100000 km

Total time = (60/3600) h

The speed= (300 ×2π×50)/100000 km/h

(60/3600

=18π km/hr

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