The seeds of protogalaxies were comparable in mass to the ________
Fill in the blank(s) with correct word
smallest dwarf irregular galaxies
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Laboratory experiments conducted with particle accelerators confirm predictions made by the theory that unifies
A) the electromagnetic and weak forces into the electroweak force. B) the strong, weak, and electromagnetic forces into the GUT force. C) the unification of all four forces into a single "superforce." D) the strong and weak forces into the combined nuclear force.
The polarization of sunlight is greatest at
A) sunrise. B) midday. C) both sunrise and sunset. D) sunset.
When a switch is closed to complete a DC series RL circuit,
a. the electric field in the wires increases to a maximum value. b. the magnetic field outside the wires increases to a maximum value. c. the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed. d. all of the above are true. e. only (a) and (c) above are true.
You are measuring how velocity changes with time of two stars like the Sun in order to detect their planets
Both stars have a velocity curve with a periods of 2 years, but the maximum size (peak-to-peak amplitude) of the velocity curve of star A is 100 km/s, and for star B it is 200 km/s. What causes this difference? Assume the planets are named after their stars. A) Planet A is farther from Star A than Planet B is from Star B. B) Planet A is closer to Star A than Planet B is to Star B. C) Planet A is more massive than Planet B. D) Planet A is less massive than Planet B. E) Not possible to say, since you're measuring the velocity curve of the stars, not the planets.