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What is the power of an engine required ...

What is the power of an engine required to move a train of mass 400 metric tons with a speed of 36 km/h, on a level track, if the force of friction is 10 N/metric ton?

A

20 kW

B

30 kW

C

40 kW

D

50 kW

Text Solution

Verified by Experts

The correct Answer is:
C
Force of friction (F)=`400xx10=4000N`
Speed=36 km/hour`=(36xx1000)/(3600)=10m//s`
`:.` Distance travelled in one second =10m
and the work done in one second
=Frictional force`xx`Distance
`=4000xx10=4xx10^4J//s`
This is the power of the engine in watts.
`:." "P=4xx10^4W=40` kilowatt
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