Question

motor boat move at a steady speed of 12m/sec. Water resistance acting on it
is 3500N. Calculate the power of its engine?
(42KW)​

Answer 1

Answer:

42000W or 42kW

Explanation:

if it is steady speed, then the force produce by engine is equal to the resistance acting on the boat.

So, it is 3500N.

as you know,

• Power = work/time

and simply you can say.

• work = Force x distance

lets say boat has moved for one second.

then the distance reached by the boat is 12 meters. because the speed is 12 m/s.

1. Force of engine = 3500N
2. distance moved = 12m

so now, work done by engine can be calculated

1. work= 3500 x 12 = 42000 and
2. Time = 1 second

power = work/time

=42000/1

=42000W = 42kW