When a spinning object changes its size, its rotation rate
A. remains the same.
B. always decreases.
C. always increases.
D. increases or decreases, depending on whether it shrinks or expands.
Answer: D
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A 50.0 g glass container contains 200 g of water at
A 20.0 g piece of an alloy at
is added to the water in the container. The final temperature of the mixture is 
What is the specific heat of the alloy in cal/gm 
(specific heat of water = 1.00 cal/gm
specific heat of glass = 0.200 cal/gm
A. 2.75 B. 1.87 C. 1.54 D. 0.852 E. 0.553
Which of the following best describes the sizes of atoms?
A) Atoms are so small that millions of them could fit across the period at the end of this sentence. B) Atoms are too small to see by eye, but can be seen with a handheld magnifying glass. C) Most atoms are about a millionth of a meter (1 micrometer) in diameter. D) Atoms are roughly the same size as typical bacteria.
Why is Venus's day so long (a day-night cycle on Venus lasts for as long as 243 Earth day and night cycles)?
A. No one knows the reason. B. Venus's rotation time is very long compared to the time it takes to go once around the Sun. C. Because Venus's year is longer than a year on Earth. D. Venus's rotation time is very short compared to the time it takes to go once around the Sun. E. Because Venus's year is shorter than a year on Earth.
Matter waves were confirmed when it was found that electrons
a. diffract. b. have a plus or minus spin quantum number. c. possess a negative charge. d. have mass.