How did James Joule determine how much work is equivalent to how much heat?
a. By attaching a team of horses to cannon-boring equipment.
b. By repeating Rumford's experiments but measuring the amount of heat created.
c. By defining one horsepower as the rate that a very strong horse does work.
d. By creating a system where he could change the heat either with work or with external heat sources.
e. By heating a gram of water by one degree.
d
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An object weighing 4.00 N falls from rest subject to a frictional drag force given by Fdrag = bv2, where v is the speed of the object and What terminal speed will this object approach?
A) 1.78 m/s B) 3.42 m/s C) 1.15 m/s D) 2.25 m/s E) 0.75 m/s
A scientific name consists of which of the following?
a. family name only b. genus name only c. species designation only d. family name and genus name e. genus name and specific epithet
Star A and star B both have an absolute magnitude of 2.0, but star A has an apparent magnitude of 5.0 and star B has an apparent magnitude of 7.0. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. B) Star B appears brighter than star A, but actually star B and star A are the same brightness. C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
Giant and supergiant stars are rare because
a. they do not form as often as main sequence stars. b. the star blows up before the giant or supergiant stage is reached c. the giant or supergiant stage is very short. d. the giant or supergaint stage is very long