The radiation our eyes are most sensitive to is the color
A) black at 227 nm.
B) blue at 4,321 nm.
C) violet at 7,000 Angstroms.
D) yellow-green at about 550 nm.
E) red at 6563 Angstroms.
D
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The star Algol is
a. an astrometric binary. b. a spectroscopic binary. c. a visual binary. d. an eclipsing binary. e. a spectroscopic binary and an eclipsing binary.
You fall, while skiing, and one ski (of weight W) loosens and slides down an icy slope (assume no friction), which makes an angle ? with the horizontal. The force that pushes it down along the hill is
A) W. B) W cos ?. C) zero; it moves with constant velocity. D) W sin ?. E) W tan ?.
The turntable of a record player has an angular velocity of 8.0 rad/s when it is turned off. The turntable comes to rest 2.5 s after being turned off. Through how many radians does the turntable rotate after being turned off? Assume constant angular acceleration
a. 12 rad b. 8.0 rad c. 10 rad d. 16 rad e. 6.8 rad
Of those elements listed below, the binding energy per nucleon reaches a maximum nearest
A. oxygen. B. iron. C. gold. D. tungsten. E. uranium.