One of the most important physical properties of polymers is their low ______________.
Fill in the blank(s) with the appropriate word(s).
density
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A bicycle wheel has an outside diameter of 66 cm. How far does a point on the rim travel when the wheel rotates through an angle of 70°?
What will be an ideal response?
Which of the following statements comparing halo stars to our Sun is not true?
A) Most stars in the halo have either died or are in their final stages of life, while the Sun is only in about the middle of its lifetime. B) Most stars in the halo are less luminous than the Sun. C) Most stars in the halo have cooler surface temperatures than the Sun. D) Most stars in the halo contain a much lower percentage of heavy elements than the Sun.
If three samples have the half-lives listed below, which is the most radioactive?
A) a sample with a half-life of 20 minutes B) a sample with a half-life of 20 hours C) a sample with a half-life of 20 years D) a sample with a half-life of 20 million years E) none of the above
A certain amount of ideal monatomic gas is maintained at constant volume as it is cooled from 455K to 405 K. This feat is accomplished by removing 400 J of heat from the gas. How much work is done by the gas during this process?
The ideal gas constant is R = 8.314 J/mol ? K. A) 0.00 J B) 200 J C) 400 J D) -400 J E) -200 J