Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
A. their changes in momentum.
B. the force each exerts on the other.
C. their changes in kinetic energy.
D. all of the above.
E. only (a) and (b) above.
Answer: E
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Why does the Moon have a layer of "powdery soil" on its surface?
A) It is the result of countless tiny impacts by small particles striking the Moon. B) Recent, large impacts shattered lunar rock to make this soil. C) It is made by the same processes that make powdery sand on Earth. D) It exists because the Moon accreted from powdery material after a giant impact blasted the Earth.
Direct detection of an extrasolar planet means ________
A) seeing the planet with the naked eye B) acquiring images or spectra of the planet C) observing the planet's effect on its host star D) sending a space probe to the planet
When an acid reacts with a carbonate or hydrogen carbonate, the products are water, ______________, and a salt
Fill in the blank(s) with correct word
The layer of rock immediately below the lithosphere is called the
a. outer core. b. asthenosphere. c. Moho. d. lower mantle.