How do astronomers determine the distance to stars that are farther than 100 parsecs away?
a. measuring the shift of the stellar parallax
b. estimating a star's spectral type and comparing it to the spectroscopic parallax
c. subtracting absolute from apparent magnitudes
d. using trigonometry in the triangulation method
e. measuring the proper motion of a star
c
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The Crab Nebula is a bright, long-lasting supernova remnant that was made by a ________ supernova
Fill in the blank(s) with correct word
What is thought to lie at the center of Jupiter?
A) a hot sea of liquid metallic hydrogen B) gaseous hydrogen and helium, for Jupiter is not differentiated like Earth C) a fusion core like the Sun's, with hydrogen being turned into helium D) a solid core of crystalline helium E) a massive core of rocky materials with some iron mixed in
If M = 1.1 kg, what is the tension in string 1?
a.
54 N
b.
47 N
c.
40 N
d.
62 N
e.
57 N
A nuclear reaction, which gives off a total of 2.0 × 10^16 J of energy, expends how much mass in the process? (c = 3.00 × 10^8 m/s)
a. 2.2 kg c. 22 kg b. 180 kg d. 0.22 kg