Question

B?

Answer 1

B

Answer 2

the sign convention always confuses me on these but since heat is being removed from the system, Q is negative and since the system is doing work, W is positive

so -20 + 50 I think?

Answer 3

actually, since the equation is Q - W it's -20 - 50, so -70

Answer 4

A

Answer 5

the system is losing heat, would that make Q positive or negative?

Answer 6

neg

Answer 7

so c

Answer 8

good

Answer 9

D

Answer 10

good

Answer 11

ugh b or d

Answer 12

closed

Answer 13

good, so C

Answer 14

C

Answer 15

good

Answer 16

B

Answer 17

good

Answer 18

D

Answer 19

good

Answer 20

D

Answer 21

good

Answer 22

A

Answer 23

(W)ork

Answer 24

O Duh :/

Answer 25

what type of system is earth

Answer 26

closed right?

Answer 27

yeah, for practical purposes/calculations it's closed, although technically it does receive matter from space