Your friend left your house and has been driving 60 miles per hour the whole time since then, and has gone 30 miles. How long has she been driving?
A) 30 minutes
B) 60 minutes
C) 2 minutes
D) 1800 minutes
E) 1/2 minute
A
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An atom is said to have been ________ when it absorbs a photon with sufficient energy to free an electron
Fill in the blank(s) with correct word
Two parallel wires carry the a current I in the same direction. Midway between these wires is a third wire, also parallel to the other two, which carries a current 0.5 I, but in the direction opposite from the first two wires. In which direction are the net forces on the outer wires?
a. Both forces are toward the center wire. b. Since the net forces are zero, there is no direction. c. Both forces are away from the center wire. d. Both forces on the two wires are in the same direction in space.
Determine the heat transfer per unit area for pool boiling water at 200 kPa and where the surface temperature of the container is 135ยบ C. Compare results using Equation 10-4 to those using Equation 10-6. Assume a surface tension of 45 mN/m for water at 200 kPa.
In what sense are the quasars "quasi-stellar"?
A) Their energy production is hydrogen-helium fusion, like main sequence stars. B) They are upscale versions of O stars, yet hundreds of times more massive. C) Their luminosity comes from the millions of supergiants that compose them. D) Their spectra is like that of ordinary stars. E) In short time exposures, their images looked stellar.