The work done by static friction can be:

a. positive.
b. negative.
c. zero.
d. Any of the above.


d

Physics & Space Science

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Only during the last decade of the twentieth century did the Arctic began to experience an ozone hole and formation of polar stratospheric clouds, and the hole expanded in a regular way after it appeared

What does this indicate about Arctic stratospheric temperatures during this period? Explain.

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In the context of measuring the properties of galaxies, _____ are examples of a standard candle

A) Cepheid variable stars B) white dwarf stars C) M stars D) red giant stars

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A loop of gas following the magnetic field lines between sunspots' poles is:

A) a flare. B) a ray. C) a coronal hole. D) a prominence. E) a coronal mass ejection.

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The process where a plastic sheet is formed by rolling is called ___________.

Fill in the blank(s) with the appropriate word(s).

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