Answer:
The liquid formed from a melted solid has the same mass as the solid has.
Explanation:
As long as no water can escape, the mass of the ice before melting must equal the mass of the liquid water after.
Answer:
39.240 W
Explanation:
Let's start by calculating the work done by the engine. We can assume that it is the same work done by the weight of the object to bring it from 40m to the surface: as much energy it takes to bring it up, the same ammount it takes to bring it down. Said work is 
At this point we can simply apply the definition of power, that is
, to get the power of the engine is 
Answer:
I beileve its A because energy is what gives the ability to do work
Explanation:
The Hertzsprung-Russell Diagram is a plot between luminosity and temperature except that the temperature is decrementing to the right on the horizontal axis. According to this diagram the sun has a luminosity of 1 and a temperature at around 5,400 K.