Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 to a final volume of 100 cm3.
A. 71
B. 52
C. 67
D. 191
E. 208
Answer: C
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A bowling ball is dropped from a height h onto the center of a trampoline, which launches the ball back up into the air. How high will the ball rise?
(a) Significantly less than h. (b) More than h. The exact amount depends on the mass of the ball and the springiness of the trampoline. (c) No more than h—probably a little less. (d) Cannot tell without knowing the characteristics of the trampoline.
A 60-W and a 100-W light bulb are connected in parallel to a 120-V outlet. Which bulb draws more current?
A) 60-W bulb B) 100-W bulb C) both the same.
What did Thomson discover about the electron that changed a long-accepted idea about atoms?
a. That electrons are negatively charged. b. That electrons do not respond to a magnetic field. c. That electrons are smaller than atoms. d. That electrons respond to an electric field. e. That they were ionized.
Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular size of the Moon is about 1/2 degree. B) The angular distance between those two houses in the distance is 30°. C) The angular distance between those two bright stars in the sky is about 2 meters. D) The angular size of the Sun is about the same as that of the Moon. E) You can use your outstretched hand to estimate angular sizes and angular distances.