"Starburst" events are a common outcome of galactic collisions
a. True
b. False
Indicate whether the statement is true or false
True
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In the double-exhaust model, the radio lobes of a radio galaxy are inflated by
a. jets of excited gas flowing from the central galaxy. b. jets of high-energy sound waves flowing from the central galaxy. c. a disk of ionized material that orbits very near a supermassive black hole. d. dark clouds of very cold gas and dust. e. None of the other choices are correct.
If we double only the spring constant of a vibrating ideal mass-and-spring system, the mechanical energy of the system
A) increases by a factor of . B) increases by a factor of 2. C) increases by a factor of 3. D) increases by a factor of 4. E) does not change.
Is heat absorbed or released by ice when it melts?
Conservation of ____________ is observed in strong and electromagnetic interactions but not in weak interactions
a. baryon number b. lepton number c. strangeness d. charm e. beauty