To the surprise of Michelson and Morley, their interferometer experiment provided evidence that the speed of light is
A) invariant.
B) the same whether its source approaches or recedes.
C) constant.
D) all of the above
Answer: D
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An “empty” steel barrel with its lid off has some gasoline remaining in the bottom, as shown. If the vapor pressure is 1 psia, estimate the evaporation rate of the gasoline and its vapor pressure half-way up in the barrel. Assume the mass diffusivity of gasoline into air is 0.0094 ft^2/s and assume that the vapor pressure of the gasoline is zero at the top.
A star has an apparent visual magnitude of +19 . Which will you need to see this star?
a. naked eye b. binoculars c. telescope like Hubble Space Telescope d. All of the other choices can be used.
An ice cube with large air bubbles in it floats in a brim-full container of water. When the ice cube melts,
A) water spills over. B) no change in water level occurs. C) water level in the container goes down.
Mesons are composed of ________ quarks, and baryons are composed of ________ quarks
a. two, two b. two, three c. three, two d. three, three