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
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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
Very importantly, a hydraulic press can multiply
A) forces. B) pressures. C) energy. D) all of the above E) none of the above
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.
The only way to make sound travel faster in air is to change the air's ____________
Fill in the blank(s) with correct word