A chair is placed on a rug. Then a book is placed on the chair. The floor exerts a normal force
A. on all three.
B. only on the book.
C. only on the rug.
D. upwards on the rug and downwards on the chair.
E. only on the objects you have defined to be part of the system.
Answer: C
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In the apparatus shown in figure Q4.1b, the final value displayed by the voltmeter is proportional to 
A. The rate at which electrons emerge from the cathode. B. The average kinetic energy of the ejected electrons. C. The maximum kinetic energy of the ejected electrons. D. Both A and C.
A soda-pop can containing only steam is placed top downward in a pan of water. Whap! The can is dramatically crushed by atmospheric pressure. The reduced pressure inside the can is due to
A) contact with the relatively cooler water. B) sudden slowing of the air and steam molecules inside. C) condensation of steam inside. D) reduced internal energy. E) rapid conduction of heat to the relatively cool water.
Which of the following worlds have the thinnest lithospheres?
A) Earth and the Moon B) Venus and the Moon C) Mercury and Venus D) Earth and Mars E) Earth and Venus
Objects A and B are at the same temperature. Object A now has its temperature increased by one Fahrenheit degree, while B has its temperature increased by one Kelvin degree. Which object now has higher temperature?
A. Object A B. Object B C. Both have the same temperature D. It is impossible to tell from this data