A sealed cup of water is placed in a microwave oven. The water absorbs microwave energy, which causes its atoms to vibrate more vigorously, making the water warmer. In this process, the mass of the water in the cup:
A. Increases
B. Decreases
C. Does not change
A. Increases
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Series/Parallel Circuits: When unequal resistors are connected in parallel in a circuit,
A. the same current always runs through each resistor. B. the potential drop is always the same across each resistor. C. the largest resistance has the largest current through it. D. the power generated in each resistor is the same.
A main-sequence star's luminosity can directly inform us of
A) the star's radius. B) the rate at which it converts hydrogen to helium. C) the star's mass. D) the star's distance from us.
Which of the following is FALSE?
a) Light, radio, ultraviolet, and gamma rays are all forms of electromagnetic radiation. b) Emission spectra are characterized by narrow, bright lines of different colors. c) An absorption spectrum appears as a continuous spectrum interrupted by a series of dark lines. d) The energy of a photon is inversely proportional to the wavelength of the radiation. e) The wavelengths of the emission lines produced by an element are different from the wavelengths of an absorption line produced by the same element.
A 150-N sled is pulled up a 28° slope at a constant speed by a force of 120 N. What is the coefficient of kinetic friction between sled and slope?
a. 0.53 c. 0.37 b. 0.22 d. 0.33