A person throws three rocks off a cliff of height h at exactly the same speed 
, each time, but throwing rock A almost vertically upward, rock B horizontally, and rock C almost vertically downward (see the diagram below). 
Which rock hits the ground with the greatest speed? (Ignore air friction.)
A. Rock A
B. Rock B
C. Rock C
D. Rocks A and C hit with the same speed, faster than B.
E. All three rocks hit with the same speed.
E. All three rocks hit with the same speed.
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The Sun crosses the celestial equator going southward at the point called the _____
A) vernal equinox B) winter solstice C) summer solstice D) autumnal equinox
The person who developed the concept of a wave function was
a. Max Planck. b. Albert Einstein. c. Neils Bohr. d. Erwin Schrödinger. e. Werner Heisenberg.
A negative ion is moving east near the equator where the Earth's magnetic field is horizontal to the north. The direction of the magnetic force on the ion is
A. north. B. south. C. up. D. down. E. not meaningful since the force is zero.
According to Wein's law, the larger the blackbody, the shorter its peak wavelength
Indicate whether the statement is true or false