Galileo dropped two balls of different weights and found they accelerated equally to the ground below. Einstein imagined the same result for a side-by-side drop
A) without invoking gravity.
B) in an accelerating vehicle.
C) whether they were of the same mass or not.
D) all of the above
E) none of the above
Answer: D
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How do we know sunspots have magnetic fields?
A. Wien's law B. the Zeeman effect C. We have measured the sunspots' fields with spacecraft. D. the Hubble effect E. None of these choices is correct.
Stare at a red wall for a few minutes and then gaze at a white wall. Due to retina fatigue you see
A) more red. B) cyan. C) black.
The mass density of an object equals its _____ divided by its ________
Fill in the blank(s) with correct word
Uniform Electric Fields: A uniform electric field, with a magnitude of 500 V/m, is points in the +x direction. If the potential at x = 5.0 m is 2500 V, what is the potential at x = 2.0 m?
A. 0.50 kV B. 1.0 kV C. 2.0 kV D. 4.0 kV E. 5.0 kV