A good conductor of electricity is generally a good conductor of heat. True or False? ________
Fill in the blank(s) with the appropriate word(s).
true
T
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Radio waves are produced by
A) nuclear vibrations. B) molecules in thermal motion. C) electrons orbiting around the nucleus in atoms. D) electric currents oscillating in human-made electronic devices. E) mechanical oscillators that move air back and forth.
What makes Neptune's moon Triton stand out from all the other large satellites in the Solar System?
a. originated as a comet b. the most geologically active c. the most reflective satellite d. largest satellite in the Solar System e. the only large satellite with a backward orbit
A Tungsten w ire is 1.50 m long and has a diameter of 1.00 mm. At 20.°C a current of 50. mA flows through the wire. [?=5.6 × 10-8 ? ? m; ?=0.0045(C°)-1]
(a) Determine the potential across the wire. (b) If the wire temperature increases by 100. C°, what potential is now required to produce a current of 50. mA?
The period of a pendulum is the time it takes the pendulum to swing back and forth once
If the only dimensional quantities that the period depends on are the acceleration of gravity, g, and the length of the pendulum, L, what combination of g and L must the period be proportional to? Acceleration has dimensions of [L][T-2]. A) g/L B) gL2 C) gL D) E)