Briefly explain how we think quasars produce so much energy
What will be an ideal response?
The energy is produced in the accretion disk around a supermassive black hole.
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The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be:
a. m c. m/s b. s d. kg/s
What is happening deep inside a star while it expands into a subgiant?
A) It is fusing hydrogen to produce helium in the core. B) It is fusing hydrogen to produce helium in a shell around the core. C) It is fusing helium to produce carbon in the core. D) It is fusing helium to produce carbon in a shell around the core. E) It is not fusing any element; it is contracting and heating up.
A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet and the coil are now both raised upward with the same velocities
As viewed from above, what is the direction of the current induced in the coil as the magnet approaches the coil? A) counterclockwise B) clockwise C) No current is induced in the coil. D) An emf but no current is induced in the coil.
The fundamental concept of geology that was developed by James Hutton is
a. radiometric dating. b. the principle of superposition. c. the principle of cross-cutting relationships. d. uniformitarianism.