Height & weight.
It depends on what you consider necessary. Leaving your computer on will not hurt a thing. The internet is contrived of millions of computers that stay on all the time. If you are looking to conserve energy, then it would be necessary.
Well he has the spiritual energy to, but he doesn't have the relentlessness necessary to do such a thing. Sooo no. He can't.
It is not necessary that our life forms on planet earth require energy only from sun. Plants can photosynthesize and survive under artificial light. The only thing is we don't have an alternative source of energy.
No, energy will transfer between any adjacent bodies, moreover, a medium is not necessary for energy to transfer between objects at all. That would be a little thing called radiation.
No. Specific heat capacity (c) is used in to calculate energy when matter is not undergoing a phase change [Q = mc(delta)T]. Heat of fusion (HF) is used to calculate energy when matter is either melting or freezing [Q = m(HF)].
necessary means if do you think you should be doing that or do you feel that your doing the right thing "do you feel that's necessary"
there is such thing as light energy we all us light DOH
The worst thing about nuclear energy is that it can kill people.
Every thing in the universe has energy.
Because its an important thing
by eating you get energy from the food
No