O and B stars are examples of ________________ that are used to outline the arms in a galaxy like the Milky Way galaxy
Fill in the blank(s) with correct word
spiral tracers
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A rotating diatomic molecule in its l = 1 quantum state has energy E. What is the energy of the same molecule in its l = 2 quantum state?
A) 3E B) 6E C) 2E D) 8E E) 4E
The ratio R at which paint can be sprayed from a spray gun may be expressed as R = a ? t. If R is measured in m3/ s, and time is measured in seconds, what are the units of "a"?
A) m3 B) m3s C) m3 s3 D) m3/s E) m3/s2
A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?
A) 4T B) T/2 C) T D) 2T E) T/4
Suppose a power plant uses a Carnot engine to generate electricity, using the atmosphere at 300 K as the low-temperature reservoir. Suppose the power plant produces 1 × 10^6 J of electricity with the hot reservoir at 500 K during Day One and then produces 1 × 10^6 J of electricity with the hot reservoir at 600 K during Day Two. The thermal pollution was
a. greatest on Day One. b. greatest on Day Two. c. the same on both days. d. zero on both days.