PHYSIC's HELP REALLY NEEDED! Thanks?

Question

The most powerful ice breaker in the world was built in the former Soviet Union. The ship is almost 150 meters long, and its nuclear engine generates 56 MV of power. How much work can this engine do in 1 hour?

And the first practical car to use a gasoline engine was built in London in 1826. The power generated by the engine was just 2984W. If this engine ran for 12 seconds, what would the final kinetic energy of the car be, assuming it started from rest?

Answer 1

P = W/t

So multiply the power by the time, remember to do it in seconds and you'll get the work

for the second one, same thing, also W = change in kinetic energy

So find howmuch work was done by multiplying 2984 by 12

and thats the change in kinetic energy.

Answer 2

Power is defined as energy (or work, they're the same thing in physics) per unit time. The SI unit of work and energy is the joule (J). A power of 1 joule per second is defined as 1 watt (W). So to calculate the work done by an engine with a constant power output, you simply multiply the power by the time in seconds.

The energy calculation works the same way. The unstated assumption here is that none of the energy is dissipated as heat. Consider that if the car had its handbrake partially set, it would accelerate to a slower speed. But, neglecting frictional losses, the kinetic energy of the car is equal to the power output of the engine times the time it runs for.

Answer 3

1) - is it 56MV or is it supposed to be 56MW repost the question

2) Power x time = Energy

2984W x 12s = 35808 J