# The wheels of the locomotive of a train are 2.1m in radius.they make 75 revolutions in one minute . find the speed of the train in km pr hour.

2
Log in to add a comment

Log in to add a comment

You know that the circumference of a circle is equal to 2 times pi times the radius, or

C = 2 π r or

C = 2 * π * (2.1)

Using 3.14 for π,

C = 2 (3.14)(2.1) or C = 13.2 meters (depending on how you are to round your answers...)

Since the wheel goes around 75 times per minute, the wheel will travel approximately 990 meters per minute.

In an hour (60 minutes) the train will travel 990(60) meters, or about 59400 meters.

The radius of the wheel (r) = 2.1 m

No. of revolutions in one minute = 75

no. of revolutions per second (n) = 75/60 = 15 / 12 = 5/4 revolutions

The distance traversed in one second (Speed) = 2πr × 5/4 = 13.2 × 5/4 =

I hope my answer is correct !

If u r satisfied please mark my answer as the best !

Thank you !

Have a nice day !