Two identical balls have the same amount of charge, but the charge on ball A is positive and the charge on ball B is negative. The balls are placed on a smooth, level, frictionless table whose top is an insulator. Which of the following is true?
a. Since the force on A is equal but opposite to the force on B, they will not move.
b. They will move together with constant acceleration.
c. Since the force on both balls is negative, they will move in the negative direction.
d. None of the above is correct.
d
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and outside is 
What is the radius of the window?
A. 47 cm B. 53 cm C. 27 cm D. 7.1 cm E. 84 cm
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Neglect the effect of the glass wall of the bowl. A) 3.3 cm inside the bowl B) 3.9 cm inside the bowl C) 2.5 cm inside the bowl D) 3.0 cm inside the bowl E) 1.7 cm inside the bowl
When an ideal gas is subjected to an adiabatic process
A) no work is done on the gas. B) the temperature of the gas does not change. C) the internal energy of the gas does not change. D) all of the above E) none of the above
The oldest evidence of life on Earth dates back to about how many years ago?
a. 65 million b. 3.8 million c. 3500 million d. 570 million