Mercury's major atmospheric gas is

a. oxygen.
b. hydrogen.
c. carbon dioxide.
d. Misleading; the atmosphere is virtually nonexistent.


d

Physics & Space Science

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In which of the following cases would you feel weightless?

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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

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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).

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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.

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