Question

A car is moving with a speed of 40km/h if the car engine generates 7kw power then find the resistance in path oh motion

Answer 1

Power = Force × speed.

Here in this case The engine has to deliver Power against Resistance (Force) to maintain a constant speed .

Resistance = Power/speed;

_____________

Given :

Power = 7 kW = 7000W

Speed = 40km/h = 40×(5/18) m/s.

= 11.11 m/s

_____________

Resistance = 7000/11.11

= 630.063 N

_____________

hope it helps!