power

Question

3.2 Calculate the power required to pull a mass of 160 kg at a constant velocity of 360 km/h down a plane which makes an angle of 25° with the horizontal. The friction force is 728 N.

Answer 1

The mass of the object is  ( m )160 kg .

Kinetic Friction(Fk) = 728 N .

The object is pulled down on a incline plane with 25° angle .

The amount of force required to pull down a object is Mg sinø + friction force .

                                                                                       =  Mg sinø + F_k 

                                                                                                                   = 160*9.8 sin 25 + 728

                                                                                      = -207.5275 + 728

                                                                                      = 520.47 N

So resultant force  =  520.47 N

Power P = Force * velocity 

P = 520.47 * 360 

P = 187369.2 W

So the  power required to pull is  187369.2 W