Einstein's theory of relativity is based in part on which one of the following postulates?
a. Mass and energy are equivalent.
b. Space and time are absolutes.
c. Energy is conserved only in elastic collisions.
d. Speed of light in a vacuum is same for all observers regardless of source velocity.
d
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The mean free path of a molecule is 
m in an ideal gas at standard temperature and pressure. What is the mean free path when the pressure of the gas is doubled and the temperature is constant?
A. 
B. 
C. 
D. 
E. 
Representative elements are those that are found in what area of the periodic table?
a) They are all in Groups 1A through 8A. b) They are all in Groups 1B through 8B. c) They are all in Periods 1 through 7. d) They are all on the left-hand side of the table in the metal region.
The ________ Belt bodies orbit beyond Neptune, but like the planets stay close to the ecliptic plane and in fairly circular orbits
Fill in the blank(s) with correct word
Earth's atmosphere is fully transparent only to visible and radio light
a. True b. False Indicate whether the statement is true or false