Coulomb's Law: Two small identically charged balls are a certain distance apart. The vectors in the figure show the magnitude and direction of the electrostatic force on each ball due to the other one. Suppose that the charge on the left ball is now doubled (represented by two plus signs). Which vector diagram below best represents the forces that now act on each of the two balls?
A. 
B. 
C. 
D. 
Answer: C
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A) sunset B) noon C) midnight D) sunrise
Molar Specific Heats: The temperature of an ideal gas in a sealed rigid 0.60-m3 container is reduced from 460 K to 270 K. The final pressure of the gas is 90 kPA. The molar heat capacity at constant volume of the gas is 28.0 J/mol ? K. How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ? K)
A. -130 kJ B. -170 kJ C. 130 kJ D. 170 kJ E. 0 kJ
You ride in an automobile traveling at 100 km/h. It comes to a stop over 0.5 seconds. You can be sure that
a. the car's engine has stopped. b. a velocity acts. c. friction between the tires and the road stopped it. d. the car had a nonzero acceleration during that time. e. none of the other answers is correct.
Which of these is a scientific hypothesis (that could be proved wrong)?
A) atoms in proper proportions make us feel good B) atoms are in all the stars in the universe C) an atom is the smallest bit of matter in a material D) none of the above