The name of the NASA mission(s) that landed on Mars in 1976 was
A) Viking I and II.
B) Magellan.
C) Venera 14.
D) Galileo.
E) Voyager.
A
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How is a luminosity class assigned to a star?
a. by combining the apparent magnitude with the star's parallax b. by measuring the period of variability in the star's apparent magnitude c. by studying the absorption line width in the spectrum of the star d. by observing the angular size of the star's image in a photograph or digital image
Two point charges of magnitude 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m, respectively. What is the electric potential energy of this system of charges?
A) -36 mJ B) 36 mJ C) 0 J D) -72 mJ E) 72 mJ
The carbon in our bodies was formed in nuclear reactions in long-dead stars. How much energy was released when the right number of 4He nuclei combined to make 12C?
The mass of 4He is 3728.40 MeV/c2 and the mass of 12C is 11,177.93 MeV/c2. A) 7.27 MeV B) 372 MeV C) 8.42 MeV D) 2.11 MeV
A metal block sits on top of a floating wooden block. If the metal block is suspended from the bottom of the wooden block, what happens to the volume of the wooden block that is submerged in the water?