A bare roof of a warmly heated home on a snowy day indicates

A) an unwanted flow of heat.
B) good insulation.
C) a change of phase.
D) all of the above


Answer: A

Physics & Space Science

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The fact that Encephalization Quotients (EQs) of organisms have generally increased with time provides evidence for

A) cross-breeding between organisms B) artificial selection C) genetic mutations D) convergent evolution toward intelligence

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Very importantly, a hydraulic press can multiply

A) forces. B) pressures. C) energy. D) all of the above E) none of the above

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In a certain chemical reaction, chemical bonds are broken. The reaction is

a. endothermic and liberates energy. b. endothermic and absorbs energy. c. exothermic and liberates energy. d. exothermic and absorbs energy. e. described by none of the above choices.

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The only way to make sound travel faster in air is to change the air's ____________

Fill in the blank(s) with correct word

Physics & Space Science