The range of diameters and luminosities displayed by elliptical galaxies is ____
a. similar to the range of spirals, and smaller than spiral galaxies on average
b. similar to the range of spirals, and about the same as spiral galaxies on average
c. similar to the range of spirals, and larger than spiral galaxies on average
d. wider than the range for spirals, extending to much larger sizes than spiral galaxies
e. wider than the range for spirals, extending to much smaller sizes than spiral galaxies
d
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The heat of fusion for lead at 327.0 
22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg
What is the energy needed to melt 100 grams of lead starting at 0
?
A. 3.56 kJ B. 4.23 kJ C. 6.54 kJ D. 7.02 kJ E. 7.76 kJ
A scientific model is a mental conception that provides a framework that helps us think about some aspect of nature
Indicate whether the statement is true or false
A light ray enters a glass enclosed fishtank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?
Directly above Earth's equator lies the ________ in the sky.
A. Celestial equator B. ecliptic C. North Celestial Pole D. South Celestial Pole