Mercury's major atmospheric gas is
a. oxygen.
b. hydrogen.
c. carbon dioxide.
d. Misleading; the atmosphere is virtually nonexistent.
d
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In which of the following cases would you feel weightless?
A) while falling from a roof B) while parachuting from an airplane C) while accelerating downward in an elevator D) while walking on the Moon
A device that has a very small resistance to current flowing in one direction but very high resistance to current flowing in the opposite direction is a ________.
Fill in the blank(s) with the appropriate word(s).
A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2 b. 1/4 c. ?2 d. 4 e. ?1/4
If an electron is released from rest in a uniform electric field, the electric potential energy of the charge-field system
1.increases. 2.decreases. 3.remains the same.