If 30 kJ of heat flows into a system and the internal energy increases by 15 kJ, then what is the work done by or on the system?
A. +85 kJ
B. +65 kJ
C. -65 kJ
D. +15 kJ
E. -15 kJ
E. -15 kJ
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a. True b. False Indicate whether the statement is true or false
The unusually bright centers found in some galaxies are called
A) active galactic nuclei. B) halos. C) supermassive black holes. D) starbursts.
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Indicate whether the statement is true or false
A 360-g metal container, insulated on the outside, holds 180.0 g of water in thermal equilibrium at 22.0°C
A 24.0-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.0°C. Assume there is no heat exchange with the surroundings. For water, the specific heat capacity is 4190 J/kg ? K and the heat of fusion is 3.34 × 105 J/kg. What is the specific heat capacity of the metal of the container? A) 970 J/kg ? K B) 2800 J/kg ? K C) 1700 J/kg ? K D) 2300 J/kg ? K E) 3300 J/kg ? K