The nucleus makes up about what percentage of the mass of an atom?
a. 99.9%
b. 50%
c. 90%
d. 5%
a
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A monatomic ideal gas with an initial pressure of 500 kPa and an initial volume of 1.80 L expands isothermally to a final volume of 5.20 L. How much work is done on the gas in this process?
A) 955 J B) 900 J C) 875 J D) 1570 J E) 1700 J
The zeroth latitude is at
a. 90°N. b. 90°S. c. the equator. d. the Greenwich Meridian.
Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?
A) 30. km Westward + 40. km Northward B) 50. km Northwest C) 40. km Westward + 30. km Northward D) 30. km Northward + 30. km Westward E) 40. km Eastward + 30. km Southward
The number of electrons in an atom of an element is the same as the element's
a. atomic number. b. period number. c. mass number. d. group number.