When a muscle contracts, it performs work. It does this by A) converting chemical energy to mechanical energy. B) converting mechanical energy into heat energy. C) converting mass into energy. D) creating energy.

An astronaut standing on a platform on the Moon drops a hammer. If the hammer falls 6.0 meters vertically in 2.7 seconds, what is its acceleration? a. 1.6m/s² b. 4.4m/s² c. 2.2m/s² d. 9.8m/s²

5. Name three sources of atmospheric carbon dioxide.

Why do hurricanes rotate counterclockwise in the northern hemisphere

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An airplane in a holding pattern flies at constant altitude along a circular path of radius 3.50 km. If the airplane rounds half the circle in 1.50 3 102 s, determine the magnitude of its (a) displacement and (b) average velocity during that time.

The instantaneous velocity of an object is the blank of the object with a blank

Which of the following best describes the earth's average surface temperature for the past 900,000 years? A. a steady warming trend B. fairly steady temperatures until recently C. prolonged periods of cooling and warming D.

What should you always include in a great summary? (Select all that apply) A. investigation plan B. possible errors C. predictions D. new questions

What are the "base units" in the S. I. system?

What action happens if the moon spins on its axis like a top