1)the car's engine power is 44000W. Explain this number in a physical sense ...
2)400g masses in April, rising steadily over 20s reaches 100m high. What power is developing in April
...
3)the bullet is fired vertically upwards at a speed of 600 / m / s. to what maximum height it would rise if there were no air resistance
...

1) It expresses the rate (top speed) at which it can move with time.

2) P = 20 W

3) h = 18 km

Explanation:

1) Power is the rate of transfer of energy.

⇒ Power =

i.e P =

Thus a car's engine power is 44000W implies that the engine of the car can propel the car at this rate. This expresses the rate (top speed) at which it can move with time.

2) m = 400g = 0.4 kg

    t = 20 s

h = 100m

g = 10 m/

P =

  =

  =

P = 20 W

3) u = 600 m/s

   g = 10 m/

From the third equation of free fall,

= - 2gh

V is the final velocity, U is the initial velocity, h is the height.

0 = - 2 x 10 x h

0 = 360000 - 20h

20h = 360000

h =

  = 18000

h = 18 km

The maximum height of the bullet would be 18 km.