A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm. It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective
How far apart are the lenses? A) 20 mm
B) 21 mm
C) 23 mm
D) 41 mm
D
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A positively charged ping pong ball is sitting stationary on the floor in the center of a room. There is also a constant, uniform magnetic field in the room that points toward the ceiling. If I now start the ball rolling toward the back of the room, the resultant motion of the ball, as observed from the ceiling, will be
A. a diagonal straight line toward the left back corner of the room. B. a straight line in the original direction of motion. C. a diagonal straight line toward the right back corner of the room. D. a horizontal, counterclockwise circle. E. a horizontal, clockwise circle.
Suppose the following graph shows the potential energy function for a certain hypothetical interaction. 
This interaction is A. attractive for all r. B. repulsive for all r. C. attractive for small r, but repulsive for large r. D. repulsive for small r, but attractive for large r. E. impossible to characterize without more information.
If you were caught in freezing weather with only a candle for warmth, you would be warmer in
A) an igloo. B) a tent. C) a wooden house.
The epoxy resin LCMs are _________with covalent chemical bonds after mixing with a hardener.
Fill in the blank(s) with the appropriate word(s).