Water is stored in a reservoir at an average vertical height of 350 m above the turbines of a hydroelectric power station.
During a 7.0 hour period, 1 .8 x 106 m3 of water flows down from the reservoir to the turbines'
(a) The density of water is 1000kg/m3'
For this 7.0 hour Period, calculate

ii) the gravitational potential energy transformed as the water flows to the turbines'

Can anyone answer this and tell me how to find the gravity in the equation (mgh) ?

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F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)