The number of official constellations (as defined by the International Astronomical Union) is
A) 56.
B) 88.
C) 123.
D) 205.
B) 88.
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A refrigerator extracts 65.0 J of heat from a heat reservoir at 
If the coefficient of performance of the refrigerator is 2.50, then how much heat is discharged out of the refrigerator?
A. 125 J B. 91.0 J C. 75.0 J D. 55.0 J
Based on models, how does Jupiter's core compare in size and mass to Earth?
A) It is about the same size and mass as Earth. B) It is about 10 times as large in both size and mass as Earth. C) It is about the same mass, but is 10 times as large in size as Earth. D) It is about the same size, but has about 10 times as much mass as Earth. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
The radius of a nucleus is proportional to what power of the mass number?
A) 1/2 B) 1/3 C) 1/4 D) 2/5 E) 3/8
In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.0400 mm
If the second order bright fringe is measured to be 4.20 cm from the centerline on the screen, what is the wavelength of light? A) 200 nm B) 381 nm C) 401 nm D) 620 nm E) 763 nm