9 A farmer is digging a cylindrical tunnel to drain the lake on his land. If he makes a scale model that is 4 inches high with a radius of
8 inches and the scale is 1 inch per 2 feet, approximately how much water would the tunnel hold at any time?
(The formula for the volume of a cylinder is r2 x height)
A. 6400 cubic feet
B.
1600 cubic feet
Ос.
3200 cubic feet
OD
800 cubic feet
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In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.