Astronomers measure distances across the sky as _____
A) angles expressed in units of degrees and subdivisions of degrees
B) volume expressed in units of gallons and pints
C) energy expressed in units of calories and joules
D) length expressed in units of miles and yards
A
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A portion or all of the same zodiac constellations can be seen by those in either hemisphere year round
a. True b. False Indicate whether the statement is true or false
Fourier discovered that periodic waves can be represented by
A) a series of non-periodic waves. B) the summation of a series of simple sine waves. C) a binary code. D) pulses of the same amplitude.
The gravitational force that the Sun exerts on Earth is much larger than the gravitational force that Earth exerts on the Sun
Indicate whether the statement is true or false
A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
a. concave mirror farther than one focal length from the burning candle. b. a convex mirror farther than one focal length from the burning candle. c. a biconcave lens farther than one focal length from the burning candle. d. a concave mirror closer than one focal length to the burning candle. e. a convex lens closer than one focal length to the burning candle.