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).


thermoset

Physics & Space Science

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Galileo's use of inclined planes allowed him to effectively

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Forbidden transitions and selection rules suggest that

a. a photon has linear momentum. b. a photon has energy. c. a photon has angular momentum. d. a photon has parity. e. a photon has mass.

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What is the ionization energy of singly-ionized helium, which has 2 protons?

A) 54.4 eV B) 27.2 eV C) 13.6 eV D) 6.80 eV E) 36.4 eV

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Scientists have detected thousands of gamma ray bursts. The evidence suggests that most or all of these bursts

A) have occurred in the central regions of the Milky Way. B) have occurred in distant galaxies. C) come from the same types of close binary systems that produce X-ray bursts. D) come from the Oort cloud surrounding the Sun.

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