A cubic box has sides of length 8.0 cm. What is the maximum number of pulverized spherical balls of diameter 1.5 cm that can fit inside the closed box (Vsphere = 4/3 ?r3)?
What will be an ideal response?
289
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What did the Voyager mission discover about the main rings of Saturn?
A) There are hundreds of small moons in the ring system. B) They were less dense than the rings of Jupiter. C) There are several small moons inside the inner-most ring. D) The ring system is much thicker than originally believed. E) They are composed of tens of thousands of narrow ringlets.
A rock sample contains 1/4 micrograms of the parent radioactive isotope K-40 and 3/4 micrograms of its daughter isotope Ar-40. If the half-life of this decay is 1.25 billion years, how old is this rock?
A) 5.00 billion years B) 3.75 billion years C) 1.25 billion years D) 2.50 billion years
Ionic compounds form because the valence
electrons are a) shared between the atoms. b) all transferred to one of the two atoms. c) completely removed from all atoms involved in the bonding process. d) transferred from an atom of one element to an atom of another element.
In order for two objects to have the same temperature, they must
a. be in thermal equilibrium. b. be in thermal contact with each other. c. have the same relative "hotness" or "coldness" when touched. d. have all of the properties listed above. e. have only properties (b) and (c) above.