Internal Energy (E = q + w)

If the system loses 10 J of total energy while 20 J of work is done on the system, what is q?

• -30 J

• +30 J

• -10 J

• +10 J

Tags

NGSS.HS-PS3-1

The internal energy of a system increased by 982 J when it absorbed 492 J of heat. How much work was done?

• +490 J

• -490 J

• +1474 J

• -1474 J

Tags

NGSS.HS-PS3-1

The change in internal energy for the combustion of CH4 in a cylinder is -892.4 kJ. If a piston connected to the cylinder performs 492 kJ of work, how much heat is lost from the system?

• -400.4 kJ

• +400.4 kJ

• +1384.4 kJ

• -1384.4 kJ

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

If an MP3 player does 200kJ of work and released 100kJ of heat, what is the change in internal energy for the MP3 player?

• -300 kJ

• +300 kJ

• -100 kJ

• +100 kJ

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

When work is done ON the system, "w" will be

• positive (+)

• negative (-)

When work is done BY the system, "w" will be

• positive (+)

• negative (-)

When heat is ABSORBED INTO the system, "q" will be

• positive (+)

• negative (-)

When heat is RELEASED OUT OF the system, "q" will be

• positive (+)

• negative (-)

Tags

NGSS.HS-PS3-4