Thermodynamic Processes: The figure shows a pV diagram for 0.0077 mol of ideal gas that undergoes the process 1 ? 2 ? 3. What is the volume V3? (R = 8.31 J/mol ? K)
A. 770 cm3
B. 260 cm3
C. 520 cm3
D. 400 cm3
Answer: A
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In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m
(1 hp = 746 W) (a) What is her total change in potential energy? (b) What was the minimum average power (in watts) that she expended during the 22 s? (c) What horsepower motor would be required to generate the same power?
The extreme size of volcanoes on Mars indicates that
a. Mars has a much thicker crust than Earth. b. water once flowed in streams on Mars. c. large moving plates have not formed on Mars. d. a and c e. a, b, and c
In a system of N gas molecules, the individual speeds are v1, v2, ..., vN . The rms speed of these molecules is:
A. 1 N ?v1 + v2 + ... + vN B. 1 N v2 1 + v2 2 + ... + v2 N C. (v2 1 + v2 2 + ... + v2 N )/N D. [(v1 + v2 + ... + vN )/N] 2 E. 0(v1 + v2 + ... + vN )2/N
When there is electric current through a metal wire, the moving charges are
A) only protons. B) only electrons. C) both protons and electrons. D) positive metal ions. E) negative metal ions.