Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiate energy
A) globular clusters for food
B) a very strong magnetic field from neutron stars
C) a source of high-energy electrons for synchrotron radiation
D) an accretion disk of infalling matter
E) a high rate of rotation for the black hole
D
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Dimensional Analysis: When dividing several quantities
A. the quantities can have any combination of units. B. the quantities must all have exactly the same units. C. the quantities must all be dimensionless.
The price of gasoline goes up 6% on Monday night and then goes down 7% today. What is the net percentage change in the price of gasoline from Monday?
A. 1.0% B. 2.0% C. 1.4% D. -1.0%
The first hint that the universe might be expanding came from Vesto Slipher's work with the spectra of spiral nebulae in 1912
Indicate whether the statement is true or false
Doubling the capacitance of a capacitor that is holding a constant charge causes the energy stored in that capacitor to
A) quadruple. B) decrease to one-half. C) double. D) decrease to one-fourth.