The loss of usable energy in cables used to conduct electricity from power plants to cities is cause by ________________
Fill in the blank(s) with correct word
ohmic heating
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Which types of galaxies have a clearly defined disk component?
A) spirals only B) ellipticals only C) lenticulars only D) irregulars only E) spirals and lenticulars
The period-luminosity relation for Cepheid variables was discovered in 1908 by
A) William Herschel. B) Henrietta Leavitt. C) Harlow Shapley. D) Heber Curtiss. E) Edwin Hubble.
Which rod has the smallest rotational inertia, I, the one rotating about the end, or the one rotating about the center?
A. Rotating about end
B. Rotating through center
C. They both have the same I, since they have the same mass and length
Electromagnetic radiation:
A) can only travel in a dense medium. B) has only the properties of waves. C) can behave both as a wave and as a particle. D) is the same as a sound wave. E) has nothing in common with radio waves.