The tube length of a typical microscope is
A. The distance from the objective lens to the eyepiece focal point.
B. The distance between the location of fo and the location of fe.
C. The focal length of the objective lens.
D. The distance between the final image and the eyepiece.
Answer: A. The distance from the objective lens to the eyepiece focal point.
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You observe a star very similar to our own Sun in size and mass. This star moves very slightly back and forth in the sky once every four months, and you attribute this motion to the effect of an orbiting planet
What can you conclude about the orbiting planet? A) The planet must have a mass about the same as the mass of Jupiter. B) The planet must be closer to the star than Earth is to the Sun. C) The planet must be farther from the star than Neptune is from the Sun. D) You do not have enough information to say anything at all about the planet.
A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 ?C placed on it. At the center of the shell is placed a point charge of 2.00 ?C. What is the electric field at a distance of 90 cm from the center of the spherical shell?
a. 
b. 
c. 
d. 
e. 
The ________ theory offers a likely explanation for the formation of ________.
A. density wave; spiral arms B. high rotation speed; spiral arms C. density wave; Galactic bulge D. high rotation speed; dark matter
As an interstellar cloud of hydrogen gas shrinks in size, its temperature increases
A) because thermal energy is converted to radiative energy. B) because kinetic energy is converted to radiative energy. C) because gravitational potential energy is converted to thermal energy.