A parallel-plate capacitor is disconnected from a battery, and the plates are pulled a small distance further apart. Does DV increase, decrease, or stay the same?
1.increase
2.decrease
3.remains the same
1
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Suppose Earth's rotation axis were tilted by 45 degrees instead of 23.5 degrees. How would the number of daylight hours be different on December 21 in the United States (or any northern hemisphere country)?
A) There would be more hours of daylight than we have with a 23.5 degree tilt. B) There would be fewer hours of daylight than we have with a 23.5 degree tilt. C) The number of daylight hours would be about the same as it is if its tilt were 23.5 degrees.
Why aren't heavier elements much larger than lighter elements?
a. Larger nuclear forces pull the electrons into closer orbits. b. Larger gravitational forces pull electrons into closer orbits. c. The larger positive charge in the nucleus pulls the electrons into closer orbits. d. Larger magnetic forces pull electrons into closer orbits.
When the Sun is located near one of the horizons, an observer looking at the sky directly overhead will view partially polarized light. This effect is due to which of the following processes?
a. reflection b. double refraction c. selective absorption d. scattering
A circuit consists of an AC audio amplifier, a resistor, and a speaker, all in series. The amplifier puts out an alternating voltage of 16.0 V (rms), the resistance of the resistor is 10.0 ?, and the speaker has a resistance of 11.9 ?. What is the time-averaged power delivered to the speaker?
a. 21.5 W b. 30.5 W c. 6.35 W d. 8.69 W