During which phase of the moon do you expect to observe a solar eclipse?
A. first quarter
B. new moon
C. full moon
D. third quarter
E. Solar eclipses can occur at any phase of the moon.
Answer: B
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A heat pump is used to heat a house in Minnesota in the winter and has half the ideal coefficient of performance for a reversible heat pump. If the outside air temperature is 
and the indoor temperature desired is 
and if it can do work at a rate of 1250 W, what is the rate of heat flow into the house?
A. 340 W B. 1100 W C. 625 W D. 300 W
When a glass rod rubbed with silk acquires a positive charge, the silk acquires
A. a positive charge B. a negative charge C. no charge D. it is impossible to tell which sign of charge it acquires
A silicon monoxide (n = 1.45) film of 322-nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10?9 m)
a. 467 nm b. 498 nm c. 623 nm d. 527 nm e. 736 nm
How do geologists determine the relative ages of different rocks?
What will be an ideal response?