DNA is a complex
a. atom
b. molecule
c. life form
d. mystery
e. acronym
B
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Work Done by a Gas: While 3.0 moles of gas expand from an initial volume of 0.040 m3 to a final volume of 0.085 m3, the temperature of the gas is kept fixed at 300 K. How much work does the gas do during this expansion? (R = 8.31 J/mol ? K)
A. 5.6 kJ B. 6.6 kJ C. 7.6 kJ D. 8.6 kJ E. 14 kJ
A 60.0-?F capacitor is in series with a 100-? resistor connected across an ac source of frequency 120 Hz. What is the phase angle?
A) -12.4° B) +12.4° C) -77.6° D) +77.6° E) 90.0°
An 100-g piece of copper, initially at 295°C, is dropped into 250 g of water contained in a 300-g aluminum calorimeter; the water and calorimeter are initially at 10.0°C. What is the final temperature of the system? (Specific heats of copper and aluminum are 0.0920 and 0.215 cal/g•°C, respectively. cw = 1.00 cal/g•°C)
a. 12.8°C c. 18.1°C b. 16.5°C d. 32.1°C
The color of an object depends on the colors of
A) the light that illuminates them. B) molecules that comprise them. C) the foreground.