How do you measure the mass of the supermassive black hole at the center of the Milky Way?
A.) Look at the amount of light that it emits and apply the inverse square law for brightness.
B.) Look at the orbits of nearby stars and apply Kepler's Third Law.
C.) See how fast it sucks stars in from the outer parts of the galaxy.
D.) Look at a spectrum of the black hole and measure its spectral type.
E.) Find its temperature, and assuming it is a black body, calculate its mass.
Ans: B.) Look at the orbits of nearby stars and apply Kepler's Third Law.
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The Sun has a core in which energy travels outward primarily by radiation
a. True b. False Indicate whether the statement is true or false
The thermal pressure of a gas depends on
A) density only. B) temperature only. C) density and temperature. D) composition. E) gravity.
Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 12-1. What is her angular displacement (in rad) in the 16-minute period shown in the graph?
A. 0 B. 16? C. 32? D. 40? E. 64?
If ? = 4, how many possible values can the magnetic quantum number m have?
A) 4 B) 10 C) 5 D) 9 E) 3 F) 8