The celestial sphere is
A) the central spherical region of the Milky Way Galaxy, dense with stars.
B) a spherical galaxy, centered on the Sun.
C) a useful illusion used to map the stars and other objects in the sky.
D) the star-sphere discovered by the Greeks and other ancient civilizations which shows the physical location in space of the nearby stars.
E) another name for our spherical Sun.
C) a useful illusion used to map the stars and other objects in the sky.
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How does the explosion of a nuclear bomb provide evidence of the theory of relativity?
A) The bomb causes things in its vicinity to move at very high speeds, allowing scientists to measure effects of time dilation. B) The mass of the bomb when it explodes is much greater than its normal mass. C) The bomb shortens the lifetimes of all people who happen to be near it when it detonates. D) The bomb produces energy in accord with E = mc2, which is part of the theory of relativity.
The Crab Nebula is an example of a(n) ________
Fill in the blank(s) with correct word
Faraday's Law: At a certain instant, coil A is in a 10-T external magnetic field and coil B is in a 1-T external magnetic field. Both coils have the same area and are oriented at right angles to the field. Which coil will have a greater emf induced in it?
A. coil A B. coil B C. It is impossible to know without more information about the fields.
What type of volcano forms a layered, composite cone?
a. Fumarole b. Cinder cone c. Stratovolcano d. Shield volcano