Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z has a positive charge. e. Z is neutral (has no net charge.)
D
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A time-varying horizontal force F(t) = At4 + Bt2 acts for 0.500 s on a 12.25-kg object, starting at time t = 1.00 s. In the SI system, A has the numerical value 4.50 and B has the numerical value 8.75
(a) What are the SI units of A and B? (b) What impulse does this force impart to the object? What will be an ideal response?
Approximately how long does it take the Sun to orbit the center of the Milky Way Galaxy?
A) 200 million years B) 200,000 years C) 20,000 years D) 2 billion years E) 2 million years
Fifteen microseconds is
a. 0.0000015 s. b. 0.000015 s. c. 0.00015 s. d. 0.015 s. e. 15000000 s.
In Galileo's thought experiment about rolling balls, Galileo argued that:
a. a ball rolling up the tilted surface speeds up. b. a ball rolling down the tilted surface slows down. c. a ball rolling on a level surface speeds up. d. a ball rolling on a the level surface continues at the same speed. e. a ball rolling on a level surface slows down.