Convection is important in stars because it
a. increases the temperature of the star.
b. mixes the gases of the star.
c. transports energy outward in the star.
d. carries the neutrinos to the surface of the star where they can escape.
e. b and c
E
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A spaceship, traveling at 0.560c towards a stationary space platform, launches a secondary towards the station with a speed of 0.100c relative to the spaceship. What is the speed of the secondary rocket relative to the space platform?
A) 0.460c B) 0.575c C) 0.600c D) 0.625c E) 0.660c
Isolated bells ring clearly, while bells crammed in a box have a muffled ring. This is analogous to light emitted by
A) a laser. B) a fluorescent lamp. C) an incandescent lamp. D) a phosphorescent source. E) none of the above
Decoupling refers to the separation of matter and antimatter during inflation
Indicate whether the statement is true or false
At t = 0 the switch S is closed with the capacitor uncharged. If C = 40 ?F, ? = 50 V, and R = 5.0 k?, how much energy is stored by the capacitor when I = 2.0 mA?
a.
20 mJ
b.
28 mJ
c.
32 mJ
d.
36 mJ
e.
40 mJ