14. The radius of the wheel of a vehicle is 70 cm. The wheel makes 10 revolutions in 5 seconds. Find the speed of
the wheel in m/s (Take pi = 22/7)
Answers
Answer:
The wheel of a motorcycle, 70 cm in diameter makes 40 revolutions in every 10 seconds. What is the speed of the motorcycle in km/hr
30.68 km/hr
31.68 km/hr
32.68 km/hr
33.68 km/hr
Answer: Option B
Explanation:
In this type of question, we will first calculate the distance covered in given time.
Distance covered will be, Number of revolutions * Circumference
So we will be having distance and time, from which we can calculate the speed. So let solve.
Radius of wheel = 70/2 = 35 cm
Distance covered in 40 revolutions will be
40 * Circumference =40 * 2*\pi*r =40∗2∗227∗35=8800cm=8800100m=88mDistance covered in 1 sec =8810=8.8mSpeed=8.8m/s=8.8∗185=31.68km/hr
40 * Circumference =40 * 2*\pi*r =40∗2∗227∗35=8800cm=8800100m=88mDistance covered in 1 sec =8810=8.8mSpeed=8.8m/s=8.8∗185=31.68km/hr