Which statement is true about the interstellar medium?
A) Gas contains a lot of carbon atoms.
B) Dust blocks the longest electromagnetic wavelengths.
C) Gas obscures the light from distant stars.
D) We know more about the gas than the dust.
E) Dust is spread uniformly through the galaxy.
D
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If at constant temperature and pressure a change in a system produces a negative change in the Gibbs free energy, the change is _____________.
Fill in the blank(s) with the appropriate word(s).
During which stage of planetary development did the lunar maria form?
a. cratering b. differentiation c. flooding d. tectonic plate movement e. slow surface evolution
An ideal Carnot thermodynamic engine operates between and What is its efficiency?
A) 0.38 B) 0.62 C) 0.61 D) 1.61
The velocity of a particle (m = 10 mg, q = -4.0 mC) at t = 0 is 20 m/s in the positive x direction. If the particle moves in a uniform electric field of 20 N/C in the positive x direction, what is the particle's speed at t = 5.0 s?
a. 60 m/s b. 20 m/s c. 45 m/s d. 40 m/s e. 70 m/s