- If a battery can release 514 J of energy and 485 J are used for work, how much energy is released as heat?
Answer by rex
Just the rest…… 514 – 485 = 29 J
- I am using aluminum j channel for a decorative trim around several bathroom mirrors. I tried using a miter saw with a metal abrasive blade, but the aluminum melts, and the edges are awful. My plan is to miter the top corners and butt the lower ones. Any suggestions about how to cut these things?
Answer by Dr. Strangelove
They’ll cut cleaner if you cut it by hand with a hack saw. Cleanup the edges with some sand paper.
Or, if the J channel is thin, use a 60 tooth carbide trim blade in your miter saw. I’ve done both.
- 24 J of heat are added to a gas in a contaier, and then the gas dose 6 J of work on the walls of the container. Determin the change in internal energy for the gas?
Answer by Ana
This is really simple.
delta U= Q-W = 24-6= 18 J
In this case work is positive because the gas does work.