A car is moving along a straight highway and accelerates at a constant rate while going from point A to point B. If the acceleration is positive, increasing the speed of the car, where does the position where the instantaneous speed equals the average speed occur for the interval from A to B?
a. midway between A and B
c. closer to B than to A
b. closer to A than to B
d. Any of the answers could be correct depending on the original speed.
B
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Which of the following is NOT true about the RGB color system?
A. The system combines the red, green, and blue light channels. B. The intensity level of each light channel is measured in values. C. The values range from 0 to 360. D. To ensure exact color specifications, use different values from the channels.
Which of the following is not a good reason why white-dwarf supernovae are good standard candles for distance measurements?
A) White-dwarf supernovae are so bright that they can be detected even in very distant galaxies. B) All white-dwarf supernovae involve the explosion of stars of nearly the same mass. C) White-dwarf supernovae occur only among young and extremely bright stars. D) White-dwarf supernovae are common enough that we detect several every year. E) All white-dwarf supernovae have similar light curves, which makes them easy to distinguish from massive-star supernovae.
Molecular motion stops at
A. 0 K B. 0 C C. 0 F D. 32 F
A valid unit for momentum is which of the following?
a. kgm/s2 c. kgm/s b. kg/m2 d. Nm