Martian volcanoes are larger than volcanoes on Earth because
A) Mars's weaker gravity makes it easier for tall structures to be built up.
B) the lack of plate tectonics on Mars means that mantle plumes remain stationary relative to the surface, building up huge, single mountains.
C) Mars has more internal heat than the Earth so volcanoes naturally grow to much larger sizes
D) Both A and B
D
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The ratio of the numbers of neutrons to protons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?
a. increases with greater atomic number b. decreases with greater atomic number c. is maximum for atomic number = 60 d. remains constant for entire range of atomic numbers
An electron of mass 9.11 × 10^–31 kg has a momentum of 2.61 × 10^–22 kg·m/s. What is its speed?
a. 0.29c b. 0.72c c. 0.69c d. 0.48c e. It cannot have this momentum since it would require a speed greater than c.
If astronauts could travel at v = 0.90c, we on Earth would say it takes (4.2/0.90) = 4.7 years to reach Alpha Centauri, 4.2 lightyears away. The astronauts disagree. How much time passes on the astronaut's clocks?
a. 2.0 years c. 1.4 years b. 2.4 years d. 3.0 years
Nuclear Magnetic Resonance, NMR, is more commonly referred to as
A) MRI. B) NRA. C) CT-scan. D) MRT. E) CAT.