Which of the following is an "irreversible" process?
A) A block of wood sliding to a stop along a tabletop.
B) A perfectly elastic ball that falls and rebounds from the floor back to its initial height.
C) Both of the above.
D) Neither of the above.
A
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An ac signal at a certain frequency is applied across a 40-mH inductor and a 100-? resistor. If the power factor of this circuit is 0.40, what is the value of the frequency?
A) 160 Hz B) 200 Hz C) 410 Hz D) 600 Hz E) 910 Hz
An object has kinetic energy when it is __________
Fill in the blank(s) with correct word
What is the best place to stand to view a total solar eclipse?
prenumbra anywhere annular shadow umbra
The half-circle that defines the starting point for designating longitude on the celestial sphere is called the
a. vernal equinox. b. ecliptic. c. celestial prime meridian. d. Greenwich meridian.