A given mass of gas is enclosed in a suitable container so that it may be maintained at constant volume. Under these conditions, there can be no change in what property of the gas?
A. Pressure
B. Density
C. Molecular kinetic energy
D. Internal energy
E. Temperature
Ans: B. Density
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PTFE has low _________energy. This results in other materials not sticking to it, and applications in cookware.
Fill in the blank(s) with the appropriate word(s).
Why didn't the Viking landers find organic molecules in the soil on Mars?
A) The Martian soil contains perchlorate, which destroyed the organic molecules when heated during the experiments. B) There are no organic molecules on Mars because they were carried away by the solar wind. C) The Viking landers were not designed to detect organic molecules. D) Organic molecules exist too deep below the surface of Mars to be detected.
When a solid melts, energy is
A) absorbed by the solid. B) released by the solid. C) both of these D) neither of these
A car enters a level, unbanked semi-circular hairpin turn of 100-m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is ? = 0.800. If the car maintains a constant speed of 28 m/s, it will
A. attempt to dig into the road surface. B. tend to veer toward the center of the semicircle. C. arrive safely at the end of the semicircle. D. tend to veer toward the outside of the circle. E. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.