Sustainable Energy
1st Edition
ISBN: 9781133108689
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 1, Problem 3P
To determine
Find the time the standard 60-W light bulb can glow.
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A dam is shaped like a parabola (y = x^2) and has a height of 150 meters. The water's density is 1000kg/m3.
Pt 1. FInd the total energy stored by this dam.
Pt 2. If fourty-percent of the total energy from the dam was consumed, what would be the water level's new hight?
Pt 3. If a city was using this dam for its energy and consumed 12 x 107 MW of power, how much time would it take for the level of the dam to drop down to the height in part 2?
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- 2. Consider the system described in the news: at night, when there is energy left, water is pumped from a large lake to a reservoir at 80 m above the lake level. During the day, this water is used to generate energy in a turbine located 80 m below the elevated reservoir. Considering that the water flow is always 5000 liters/s (both at the inlet of the reservoir and at the outlet) and that the pump and turbine efficiencies are 70%, what is the power (in kW) required by the pump and the power (in kW) recovered in the turbine. Data: The pipe diameter is always the same along the system (d = 0.5 m); g = 10 m/s2; γ = 9810 N/m3. Matter transport phenomena; Please make it typeable as handwriting interferes with understandingarrow_forwardQ2 A dam is used to store 700 tons of water to provide energy when needed by using turbines. If the water is stored at a height of 60 meters above ground level, calculate how much energy is stored if the water was to be released to ground level. Provide and analyse two alternative methods of energy storage.arrow_forwardCar A is moving at a rate of 3 m/s when it collided with stationary Car B that has a mass of 1,500 kg. If the speed oh the two cars became 0.735 m/s, what amount of energy transformed to heat after the collision? Assume the cars moved as one after the collision. include figure and FBD.arrow_forward
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