What is the difference between a boundary and a surface?
What will be an ideal response?
A surface is a three dimensional geometric construct but which has no
thickness. A boundary is a surface but a surface may not necessarily be a
boundary.
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Simple observations of the darkness of the night sky and the redshifts of the galaxies tell you that:
A) the Universe is contracting. B) the Universe must have an edge. C) the Universe is perfect and unchanging. D) the Universe must have had a beginning.
A planetary nebula
a. produces an absorption spectrum. b. produces an emission spectrum. c. is contracting to form planets. d. is contracting to form a star. e. is the result of carbon detonation in a 1 Mo star.
You hold an apple in one hand and an orange in the other. If you doubled the mass of the apple and tripled the mass of the orange, without changing the distance between them, the gravitational force between them would be
A) unchanged, because it is zero both before and after the mass alterations. B) five times larger. C) doubled. D) three times larger. E) six times larger.
Alternating current is normally produced by a
A) battery. B) generator. C) both of these D) neither of these