A current can be made to flow in a wire if
a. it is connected to a battery c. a magnet is put into motion near it
b. it is put into motion near a magnet d. all of the above
D
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Large amounts of material can often be seen rising from the cooling towers often seen at steam-electric power plants. These emissions are mostly
A) radioactive waste. B) soot. C) oxides of sulfur. D) water vapor, i.e., steam. E) carbon dioxide.
A 100.0 kg mass is blown apart into a 95.00 kg piece and a 5.000 kg piece. After the blast, the two masses are moving apart with a relative velocity of 100.0 m/s. The kinetic energy of the 95.00 kg mass after the explosion is
A. 1,190 J. B. 8,600 J. C. 18,750 J. D. 22,560 J. E. 23,750 J.
Ground telescopes view the light coming from celestial objects through the turbulent atmosphere of the Earth. The distortion effect this turbulence causes to the light passing through it is called:
a. dispersion b. seeing c. blending d. refraction
The very earliest Greek cosmological theory, several centuries before Ptolemy, stated that
A) the planets revolve in loop-the-loops [circles within circles] around Earth. B) the entire universe is in reality just the inside of a giant cosmic frog. C) the planets go in simple circles around the sun. D) the planets go in simple circles around Earth. E) the planets revolve in loop-the-loops around the sun.