________ is the smallest of the terrestrial planets.
A. Mercury
B. Earth
C. Venus
D. Pluto
E. Mars
Answer: A
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A stable nucleus contains many protons very close to each other, all positively charged. Why do the protons not fly apart due to mutual Coulomb repulsion?
A) The neutrons in the nucleus shield the protons from each other. B) The gravity of the protons and neutrons overcomes their repulsion at such close distances. C) There are an equal number of electrons in the nucleus which neutralize the protons. D) The Coulomb force does not operate within nuclei. E) An attractive nuclear force in the nucleus counteracts the effect of the Coulomb forces.
Why is there a two-day difference in the sidereal and synodic months?
A) The Moon speeds up at perigee, and slows down at apogee. B) The sidereal day is four minutes shorter than the solar day, and it adds up. C) The Earth is closer to the Sun during the sidereal month. D) The Earth is also revolving around the Sun, so the Moon must "catch up." E) The Moslem lunar year is only 354 days long, on average.
The velocity of an object as a function of time is given by v(t) = -3.0 m/s - (2.0 m/s2 ) t + (1.0 m/s3 ) t2. Determine the instantaneous acceleration at time t = 2.00 s
A) -5.0 m/s2 B) 2.0 m/s2 C) -18 m/s2 D) -3.0 m/s2 E) 18 m/s2
An object is placed exactly halfway between the Earth and the Moon. The object will fall toward the
A) Earth. B) Moon. C) neither