Observational evidence indicates that at least some gamma ray bursts are produced by
A) the supernovas of very massive stars that leave behind black holes.
B) the central black hole of the Milky Way Galaxy.
C) the same types of close binary systems that produce x-ray bursts.
D) white dwarf supernovas in distant galaxies.
A) the supernovas of very massive stars that leave behind black holes.
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Calculate
(a) Calculate the magnetic field created by a coil made of copper wire that has 200 turns in 5 cm and carries a current of 5 A. (b) What is the magnitude of the flux density or inductance created by this coil in a vacuum?
The microwave emission detected by Arno Penzias and Robert Wilson fits a blackbody spectrum with a temperature of about ____
a. 0 K b. 273 K c. 27 K d. 7.2 K e. 2.7 K
Power: Water flows over a waterfall that is 20 m high at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?
Fill in the blank(s) with the appropriate word(s).
Einstein earned the Nobel Prize for his
A) special theory of relativity. B) general theory of relativity. C) development of the equivalence of energy and matter, E = mc2. D) work on the particle nature of light. E) contributions to the development of the fission bomb.