The citizens of a town are aware of climate change, and they want to make changes to control it. one change they consider is replacing the nearby thermal power plant with a hydroelectric plant. if they want to make sure this change will to slow climate change, which question should they ask? is it less expensive to build a hydroelectric power plant than a thermal power plant? does a hydroelectric power plant employ fewer people than a thermal power plant? does a hydroelectric power plant emit less co2 than a thermal power plant? is the cost of operating a hydroelectric power plant less than the cost of running a thermal power plant?

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Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.