There are three ________ of elementary particles in the standard model.
Fill in the blank(s) with the appropriate word(s).
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Radioactive Decay: A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
A. 1/2 B. 1/4 C. 1/8 D. 1/16
A scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. If the diver holds his breath while quietly rising to the surface, what will the volume of the lungs be (in liters) at the surface? Assume the temperature is the same at all depths. (The density of water is 1.0 × 10^3 kg/m3.)
a. 5.9 b. 4.5 c. 6.4 d. 3.9 e. 3.1
An object weighs 432 N on the surface of the earth. The earth has radius R. If the object is raised to a height of 3R above the earth's surface, what is its weight?
A) 108 N B) 48.0 N C) 27.0 N D) 305 N E) 144 N
If the distance between two spherical charged objects decreases by a factor of two, then the electrical force between the objects
A. is half as big. B. doubles. C. increases by a factor of four. D. decreases by a factor of four. E. does not change.