Electrons in glass have a natural frequency in the
A) infrared region of the spectrum.
B) visible region of the spectrum.
C) ultraviolet region of the spectrum.
Answer: C
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According to Darwin, in the struggle for survival, those individuals whose traits best enable them to survive and reproduce will, on average, leave the largest number of offspring that in turn survive to reproduce
This is the basic idea behind his theory of A) natural selection B) creationism C) differential evolution D) artificial selection
A student plays on a see-saw with her experimental android robot, Robby. The student has a weight of 300 N and is seated 2.8 m from the axis of rotation. Robby balances her when he is seated 0.7 m from the axis. Robby's weight is
A. 667 N. B. 1200 N. C. 500 N. D. 725 N. E. 1000 N.
The term "dirty bomb" refers to
A) a bomb that uses conventional explosive to disperse radioactive materials. B) a conventional chemical bomb that disperses pieces of metal in order to harm the maximum number of people. C) a nuclear device that is optimized for the release of radioactive materials. D) a nuclear device that releases neutrons in order to kill people without harming buildings and other structures. E) any nuclear device that is used for terrorist purposes.
The speed of a 4.0-kg object is given by v = (2t) m/s, where t is in s. At what rate is the resultant force on this object doing work at t = 1 s?
a. 48 W b. 40 W c. 32 W d. 56 W e. 16 W