An ideal gas in a balloon is kept in thermal equilibrium with its constant-temperature surroundings. How much work is done by the gas if the outside pressure is slowly reduced,
allowing the balloon to expand to 6.0 times its original size? The balloon initially has a pressure of 645.0 Pa and a volume of 0.10 m3. The ideal gas constant is R = 8.314 J/mol ? K.
A) 120 J
B) 390 J
C) -330 J
D) 6.0 J
A
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How much power is theoretically available from a mass flow of 1 000 kg/s of water that falls a vertical distance of 120 m?
a. 1.18E+6 kW b. 1.20E+5 kW c. 1.18E+3 W d. 8.17E+1 W e. 1.18E+6 W
The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 1.54 eV B) 1.65 eV C) 1.79 eV D) 1.81 eV
At which place on the Earth will you weigh less?
A. at the North Pole B. at the equator C. at the South Pole D. You weigh the same at all of these places.
Which of the following species is the oxidizing agent?
2 CuBr ? 2Cu + Br2 A) Cu B) CuBr C) Cu+ D) Br- E) Br2