This image combines a visible-light view of the galaxy Hercules A with an image showing radio wave emission (the reddish colors) in its vicinity. The likely explanation for the two huge clumps of radio emission far to either side of the visible galaxy is
A) the radio emission comes from gas shot out into space by jets powered by a supermassive black hole in the galactic center.
B) the radio emission comes from gas that was left behind in the halo when the galaxy collapsed from a protogalactic cloud.
C) the radio emission comes from gas pulled out of the galaxy when it collided with another galaxy in the distant past.
D) this galaxy must have suffered two collisions in the past, with each collision pulling out gas in one direction.
A) the radio emission comes from gas shot out into space by jets powered by a supermassive black hole in the galactic center.
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Indicate whether the statement is true or false
During a lunar eclipse, the Moon's phase must be
A) first quarter. B) third quarter. C) full. D) new.
A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many kilograms of mass can be loaded onto the box before it sinks in a lake having water of density 1000 kg/m3?
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A current may be induced in a coil by
a. moving one end of a bar magnet through the coil. b. moving the coil toward one end of the bar magnet. c. holding the coil near a second coil while the electric current in the second coil is increasing. d. all of the above. e. none of the above.