The volume of matter is due mostly to its
A) protons.
B) electrons.
C) both of these
Answer: B
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How could the Universe be accelerating, despite the gravitational pull of all the matter in it?
A.) There's no friction in space. B.) There could be less dark matter than we think. C.) There could be a new force or property of space that affects the Universe on its largest scales. D.) Our laws of nature are incorrect. E.) Probably B and C.
A rectangular stack of lead bricks measures 2 m by 3 m by 4 m. The mass density of lead is 11,340 kilograms per cubic meter. What is the total mass of the stack of lead?
You can hear sound through an open window from sources that are not in your line of sight because of __________
Fill in the blank(s) with correct word
When we say that the speed of sound is measured under adiabatic conditions we assume that
a. the time associated with heat conduction is slow relative to the speed of the wave. b. no heat can flow between the system and its surroundings. c. the speed of the wave is directly proportional to the bulk modulus. d. the speed of the wave is proportional to the square root of the bulk modulus. e. air is an ideal gas.