Using Maxwell's equations, the speed of light can be calculated using which of the following fundamental physical constants? Select the letter that most completely answers the question
I,II
Using Maxwell's equations and both the permeability and permittivity of a vacuum, the speed of light can be calculated.
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Which of the following statements about the asteroid belt is not true?
A) The combined mass of all the asteroids is roughly the same as the mass of Earth. B) It is located between the orbits of Mars and Jupiter. C) Asteroids in the asteroid belt orbit the Sun in the same direction that planets orbit the Sun. D) Asteroids in the asteroid belt are made mostly of rock.
What type of software is shown in the figure above?
A. photo sharing B. image-editing C. illustration D. digital photography
What prevents stars greater than about 100 times the Sun's mass from existing?
A) The rate of thermal expansion would overcome gravitational attraction leading to explosion. B) The gravitational attraction would overcome the rate of thermal expansion leading to a black hole. C) Fusion cannot take place at these higher mass levels. D) The gaseous material of the universe is too widely dispersed to allow for the formation of stars of this mass.
Two cylindrical pipes both carry an ideal fluid (zero viscosity) in laminar flow. Pipe A has radius RA = 8 cm and flow velocity vA = 2 cm/s. Pipe B has radius RB = 4 cm and flow velocity vB = 4 cm/s. Compared to the rate of flow in pipe A, that in pipe B is
A. twice as large. B. the same. C. half as large. D. It depends on the length of the pipe