Question

Heat is added to a system and the system does 40 J of work. If the internal energy increased by 10 J, then heat added to the system is:
A) 0.33 J
B) 50 J
C) 3 J
D) 30 J

Answer 1

Can you help @amistre64?

Answer 2

Can you help @Destinymasha?

Answer 3

40 + 10 = ?

Answer 4

Wait....let me read again lol

Answer 5

I think so ^^

Answer 6

Okay I will try that answer! Is it okay if i ask you a couple more questions?

Answer 7

I can try! :P

Answer 8

An ideal heat engine absorbs heat at 200°C and exhausts heat at 80°C. What is the percentage efficiency of this heat engine?
A) 200 percent
B) 80 percent
C) 60 percent
D) 40 percent

Answer 9

I'm trying to study for a physics final and I do not get this at all!

Answer 10

o_o I'm not the best at physics lol

Answer 11

I think 40 percent, though

Answer 12

Yeah that one is a little hard lol. I have one more you might be able to help with.
If Q is the heat supplied to a gas so that the internal energy of the system increased by U, then the work done, ?W, by the gas is equal to:
A) Q-U
B) Q+U
C) Q*U
D) Q/U

Answer 13

Either B or D

Answer 14

I think B, though

Answer 15

Okay thats all thanks :)

Answer 16

You're welcome :)