A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table
The initially moving billiard ball deflects 30.0° from its original direction. What is the speed of the initially stationary billiard ball after the collision?
A) 2.00 m/s
B) 0.866 m/s
C) 1.50 m/s
D) 2.59 m/s
E) 0.750 m/s
Answer: C
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A) We would not have to worry about any warming problems in the future. B) Earth would have an average temperature of -23 degrees Celsius. C) The ice in the polar regions would have melted long ago. D) The ozone layer would not be weakening. E) The Earth would have become much more like Venus long ago.
In the 1960s, Maarten Schmidt determined that quasars were very distant objects by
A) determining how luminous they were. B) determining how small the source of light was from its variations in luminosity. C) discovering that they were embedded in distant galaxies. D) determining their redshifts. E) determining their parallax angles.
What is the symbol traditionally used to represent wavelength?
a. wl b. y c. ? d. ?
What is the longest wavelength in the Lyman Series?
A) 45.60 nm B) 91.20 nm C) 121.5 nm D) 240.1 nm E) 365 nm