The rate of heat dissipation in an AC circuit with resistance, R, and effective current, Irms, is given by which of the following?
a. 0.5 × (Irms)2R
b. (Irms)2R
c. 2.0 × (Irms)2R
d. 4.0 × (Irms)2R
b
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Which of the following can actually escape a black hole?
A. visible light B. electrons C. very low energy radio waves D. very high energy gamma rays E. None of these choices is correct.
The total amount of power (in watts, for example) that a star radiates into space is called its
A) apparent brightness. B) absolute magnitude. C) luminosity. D) flux.
Three different bodies-a uniform sphere, a uniform disk, and a hoop-all have same radius and same mass. The body with the largest rotational inertia will be
A. the disk. B. the hoop. C. the sphere. D. none, as all have the same value of rotational inertia.
The greater amount of substance in a solution is generally called the
a. salt. b. solute. c. molar concentrate. d. solvent.