In a debate, is the statement "It's only a theory" a valid argument point against a theory (as in "The theory of evolution is wrong because it's only a theory")?
a. Yes, theories are weak.
b. No, theories are strong.
c. No, theories are weak.
d. Yes, theories are meaningless.
b
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When dark matter is added, what happens to the speeds of the inner and outer stars?
A.) All the speeds increased the same. B.) The stars near the center slowed down, but the outer ones were accelerated. C.) All the stars sped up, but the outer ones gained the most speed. D.) All were slowed down by the tidal drag of the dark matter. E.) There was no change.
The coefficient of performance (COP) of a refrigerator is defined as the ratio of
A) the heat removed from the inside to the heat expelled to the outside. B) the heat expelled to the outside to the heat removed from the inside. C) the heat removed from the inside to the work done to remove the heat. D) the heat expelled to the outside to the work done to remove the heat. E) the difference between the heat expelled to the outside from the heat removed from the inside to the work done to remove the heat.
Two moles of an ideal gas are placed in a container of adjustable volume. When measurements are made
a. the pressure is inversely proportional to the volume at constant temperature. b. the temperature is directly proportional to the volume at constant pressure. c. the temperature is directly proportional to the pressure at constant volume. d. all the statements above are found to be correct. e. only statements (a) and (b) are found to be correct.
The pressure exerted by a gas is the result of __________
Fill in the blank(s) with correct word