How much potential energy is possessed by 10.000 kg of water (about 10 m3 or 260

Question

How much potential energy is possessed by 10.000 kg of water (about 10 m3 or 2600 gal) behind a dam if the distance the water will fall before it hits the blades of a turbine is 20 meters? Express your answer in Joules (3 significant figures) If it takes 2 seconds to raise an 8-kg block a vertical height of 1 meters, what is the power output? Express your answer in Watts. (3 significant figures) An electric heater has a power rating of 1500 Watts (1.5 kW). If the heater is run for 6 hours and electricity costs $0.12/kWh, how much will it cost to run the heater for this time interval?

Explanation / Answer

7)let intial velocity is u.

h=u*t-g*t2/2

1=u-4.9

u=5.9 m/s

power= mg*u=5.9*8*9.8=462.56 watt

8)

COST=$0.12*1.5*6

=$1.08

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