In the metric mks system of units, the letter k stands for ______________

Fill in the blank(s) with correct word

kilogram

Physics & Space Science

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Differential rotation of the sun is

a. heating in the chromosphere and corona that makes them hotter than the photosphere. b. the magnetic dynamo inside the sun. c. the equatorial regions of the sun rotating more rapidly than the polar regions. d. the origin (and subsequent disappearance of) sunspots first near the poles then closer to the sun's equator as the sunspot cycle progresses. e. the rotation of the sun's southern and northern hemispheres in opposite directions.

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Physics & Space Science

Selena states that proves that entropy has a definite value at the beginning and end of an adiabatic free expansion. Ron says , where W is the number of microstates of a given macrostate. Which one, if either, is correct?

A.

Only Selena, because entropy can depend only on macroscopic variables.

B.
Only Ron, because entropy can depend only on microscopic variables.

C.
Only Selena, because in an adiabatic free expansion.

D.
Neither, because we cannot calculate changes in entropy in an adiabatic free expansion.

E.
Both, because entropy, which is macroscopic, is a function of microscopic disorder.

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Physics & Space Science

By what factor is the intensity of sound at a rock concert louder than that of a whisper when the two intensity levels are 120 dB and 20 dB respectively?

a. 1012 b. 108 c. 106 d. 1010 e. 1011

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Physics & Space Science

An object is 12.0 cm from the surface of a spherical Christmas tree ornament that is 10.0 cm in diameter. What is the magnification of the image?

a. -0.500 c. +0.172 b. -0.200 d. +0.143

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Physics & Space Science