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 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?
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 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