Our senses may obtain less-than-accurate information concerning our physical world because they

a. have limited sensitivity.
b. have a limited range.
c. are useless.
d. can be deceived.


d

Physics & Space Science

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Define "intelligent civilization" according to Drake

What will be an ideal response?

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A solar-mass star will evolve off the main sequence when

A) it loses all its neutrinos, so fusion must cease. B) it completely runs out of hydrogen. C) it builds up a core of inert helium. D) it explodes as a violent nova. E) it expels a planetary nebula to cool off and release radiation.

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The horizontal speed of a projectile

a. is zero. b. stays constant. c. continuously increases. d. continuously decreases. e. sometimes decreases and sometimes increases.

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Suppose the pressure of 20 g of an ideal monatomic gas is tripled while its volume is halved. What happens to the internal energy of the gas?

a. It stays the same, as the described changes do not involve internal energy. b. It increases. c. It decreases 33%. d. This depends on the molecular weight of the gas involved, thus this is indeterminate.

Physics & Space Science