Spherical Mirrors: A person's face is 30 cm in front of a concave spherical shaving mirror. If the image is an erect image that is 1.5 times as large as the object, what is the focal length mirror?
A. 20 cm
B. 50 cm
C. 70 cm
D. 90 cm
Answer: D
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RC Circuits: A charged capacitor is connected in series with a resistor and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the charge Q on the capacitor as a function of time t?
A. A B. B C. C D. D E. E
As your room gets messier day by day, entropy is
A) increasing. B) decreasing. C) hanging steady. D) none of the above
Does the change in speed of light when it enters a material substance indicate that light is more like a wave or more like a particle of the kind considered by Newton?
a. More like a wave. b. More like a particle. c. It varies from material to material. d. Similar to both. e. Not at all like either one.
At present the universe is expanding, but we are not certain if this expansion will continue forever, come to a stop, or if the universe will ultimately collapse back into itself
What observational tests are possible to test among these three possibilities?