Explain why the observable properties of quasars imply that they are objects from the early Universe controlled by supermassive black holes
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Quasars have continuous spectra with emission lines of hydrogen. The emission lines display very high redshifts, often greater than 1.0 . The high redshifts are proof that quasars are very distant. A large distance is associated with a long look-back time, so quasars must come from the early Universe.
In order to be visible at such large distances, quasars must be very luminous. The luminosity of a quasar can vary in very short times, sometimes as short as a few hours. The rapid fluctuations show that quasars are small objects, smaller than our Solar System. The only reasonable explanation for a compact, fluctuating high-luminosity source is a supermassive black hole.
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After reviewing the data from Procedures 5 and 6, in general how do you think the voltages across individual elements in a parallel circuit compare with the total voltage supplied to the circuit?
In 1994, fragments of Comet P/Shoemaker-Levy 9 collided with Jupiter. Assume that these fragments came from very very far away with no initial speed, and neglect the effect of the sun
What was their speed when they neared Jupiter's surface at a distance of 71.4 × 106 m from its center? Jupiter has a mass of 1.90 × 1027 kg, and G = 6.67 × 10-11 N ? m2/kg2. A) 10,400 m/s B) 11,200 m/s C) 35,500 m/s D) 42,100 m/s E) 59,600 m/s
As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is
?
?
A.
, where n is a positive integer.B.
, where n is an odd integer.C.
, where n is an even integer.D.
E.
One mole of hydrogen, one mole of nitrogen and one mole of oxygen are held in a 22.4 × 10^3 cm3 enclosed vessel at 20°C. The pressure in the vessel, in N/m2, is
a. 109. b. 304. c. 326. d. 1.09 × 10^5. e. 3.26 × 10^5.