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

Physics & Space Science

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Fifteen microseconds is

a. 0.0000015 s. b. 0.000015 s. c. 0.00015 s. d. 0.015 s. e. 15000000 s.

Physics & Space Science

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.

Physics & Space Science

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?

Physics & Space Science

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

Physics & Space Science