A car of mass 920.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 39.6 km/hr (11.0 m/s), the net power which the engine supplies is 4100.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate the acceleration of the car at that time.

Question

Physics

Zoey Ayala

25 September, 22:17

A car of mass 920.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 39.6 km/hr (11.0 m/s), the net power which the engine supplies is 4100.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate the acceleration of the car at that time.

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Erickson · Answer 1

Power mgh/t

Mg = force

H/t = velocity

Power = force * velocity

Power = 4100W

Velocity = 11.0m/s

Force = power / velocity

Force = 4100/11

Force = 372.73N

F=ma

a = f/m

a = 372.73/920

a = 0.405m/s^2