In Galileo's thought experiment about rolling balls, Galileo argued that:
a. a ball rolling up the tilted surface speeds up.
b. a ball rolling down the tilted surface slows down.
c. a ball rolling on a level surface speeds up.
d. a ball rolling on a the level surface continues at the same speed.
e. a ball rolling on a level surface slows down.
d
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Which planets have a rocky, relatively dense composition?
a. Jupiter, Saturn, Earth, and Mars b. Uranus, Neptune, Earth, and Mars c. Jupiter, Saturn, Uranus, and Neptune d. Mercury, Venus, Earth, and Mars
Why are ores so valuable?
A) They are sources of naturally occurring gold. B) Metals can be efficiently extracted from them. C) They tend to occur in scenic mountainous regions. D) They hold many clues to Earth's natural history.
According to the nebular hypothesis, which of the following sequences of events are chronologically correct?
A. Solar nebula, interstellar cloud, collisions between planetesimals, accretion, planets B. interstellar cloud, Solar nebula, accretion, collisions between planetesimals, planets C. accretion, Solar nebula, interstellar cloud, collisions between planets, planetesimals D. interstellar cloud, accretion, Solar nebula, collisions between planetesimals, planets
Blue light (l = 460 nm) is incident on a piece of potassium (W = 2.45 eV). What is the maximum kinetic energy of the ejected photoelectrons? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^-19 J, and 1 nm = 10-9 m)
a. 1.0 eV c. 0.50 eV b. 0.25 eV d. 4.9 eV