what is the shortest time for which a 2.5kw kettle containing 1.5kg of boiling water can be left without boiling dry? (take the specific latent heat of vaporization of water as 2.26x10^6 j/kg).

1356 s

Explanation:

The total energy that must be supplied to the water to completely boil it is:

where

m = 1.5 kg is the mass of the water

is the specifi latent heat of vaportization of water

Substituting,

The power of the kettle is

And power is defined as the ratio between energy supplied and time:

So, the shortest time the kettle can be left to boil the water is:

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

your answer is, orbit around the nucleus