Compound Microscope: The distance between the object to be viewed and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the magnitude of the total magnification of the microscope if it is designed for minimum eyestrain?
A. 120
B. 184
C. 200
D. 360
E. 480
Answer: C
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Controlled fusion has been difficult to achieve primarily due to
A) the high temperatures required to overcome Coulomb repulsion. B) negligible proton cross section. C) the difficulty of slowing the fusion neutrons. D) the weak interaction.
While the gondola is rising at a speed of 5.0 m/s, a passenger in a balloon-supported gondola throws a small ball up at a speed of 2.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 2.8 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, up. e. 7.0 m/s, up.
Why do scientists say that evolution is a "theory"?
A) because it explains a great deal about life and is supported by an enormous body of evidence B) because they are not very confident that it really happened C) because it's really just a guess about how life developed on Earth D) because it is supported by only a small amount of evidence
A microphone records sound produced from two speakers in a room with no other sound sources. If the intensity of one of the sound waves at a given location is 0.055 W/m2 and if the microphone receives a minimum intensity of 0.004 
when both speakers are active what is a possible value for the intensity of the other source at the microphone’s location?
A. Need more info to solve.
B. 0.088 
C. 0.051
D. 0.048