In which of the following ways are Pluto and Eris more like comets than like any of the terrestrial or jovian planets?
A) They are made mostly of rock and ice.
B) They sometimes enter the inner solar system.
C) They have long tails.
D) They have thick atmospheres.
A) They are made mostly of rock and ice.
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Jan and Len throw identical rocks off a tall building at the same time. The ground near the building is flat. Jan throws her rock straight downward
Len throws his rock downward and outward such that the angle between the initial velocity of the rock and the horizon is 30°. Len throws the rock with a speed twice that of Jan's rock. If air resistance is negligible, which rock hits the ground first? A) They hit at the same time. B) Jan's rock hits first. C) Len's rock hits first. D) It is impossible to know from the information given.
The expression(s) indicating the atomic number of a nucleus is
a. A b. N c. Z d. Z + N e. A – Z
Which of the following describes a major danger of interstellar travel at near-light speed?
A) Atoms and ions in interstellar space will hit a fast-moving spacecraft like a flood of dangerous cosmic rays. B) Any interstellar journey will take much longer than the lives of the crew members. C) Time dilation will slow the heart beats of the crew to a dangerously low rate. D) Asteroid fields floating in interstellar space will present a navigational challenge.
How many quarks are in a deuteron, H?
A) 2 B) 3 C) 4 D) 6 E) 9