What is the reason that it is so difficult to view Mercury from Earth?
A) Mercury is very dim.
B) Mercury is very small.
C) Mercury can't be seen at night.
D) Mercury is often hidden by the Moon.
E) Mercury is always very close to the Sun.
E
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Which statements about images are correct? (There could be more than one correct choice.)
A) A virtual image cannot be viewed by the unaided eye. B) Mirrors always produce real images because they reflect light. C) A virtual image cannot be photographed. D) A real image must be erect. E) A virtual image cannot be formed on a screen.
The __________ binds quarks together
Fill in the blank(s) with correct word
The moon with a mass of 
kg is orbiting about the earth with a mass of 
kg at a radius of 
meters. The earth is orbiting about the sun with a mass of 
kg at a radius of 
meters. The force of gravity on the moon when it is between the earth and the sun is 
A. 
N toward the sun.
B. 
N toward the earth.
C. 
N toward the sun.
D. 
N toward the earth.
E. 
N toward the earth.
The Mesozoic era began about how many million years ago?
a. 3 b. 545 c. 245 d. 65