An engine of power 7500 W makes a train move on a horizontal surface with constant velocity of 20 ms -1. The force involved in the problem is

Question

An engine of power 7500 W makes a train move on a horizontal surface with constant velocity of 20 ms -1. The force involved in the problem is (A) 375 N (B) 400 N (C) 500 N (D) 600 N

Tardigrade Admin · Accepted Answer

Power =7500 W =7500 Js -1, Velocity v=20 ms -1 P=F v or F=(P/v)=(7500 Js -1/20 ms -1)=375 N

Q. An engine of power $7500 W$ makes a train move on a horizontal surface with constant velocity of $20 m s^{- 1}$ . The force involved in the problem is

375 N

400 N

500 N

600 N

Power $= 7500 W = 7500 J s^{- 1}$ ,
Velocity $v = 20 m s^{- 1}$
$P = F v$ or $F = \frac{P}{v} = \frac{7500 J s ^{- 1}}{20 m s ^{- 1}} = 375 N$

Q. An engine of power 7500W makes a train move on a horizontal surface with constant velocity of 20ms−1. The force involved in the problem is