Heating the air in a hot air balloon reduces the air's _________

Fill in the blank(s) with correct word

density

Physics & Space Science

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Polymers, such as epoxy, with cross-links are _____________polymers that do not soften when heated.

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

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Physics & Space Science

According to Kepler’s First Law, all planets have orbits about the Sun that are

A. circles B. squares C. parabolas D. ellipses

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Physics & Space Science

Which of the following statements is incorrect?

What will be an ideal response?

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Physics & Space Science

Which of the following is a megawatt?

A) 109W B) 106W C) 1000 W D) 10-9W E) 10-6W

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Physics & Space Science