Posted by **Ellen** on Wednesday, February 2, 2011 at 6:20pm.

The hoover dam produces 2x10 to the 9 W

of electricity. It is composed of 7x10 to the 9 kg of concrete. To produce 1 kg of concrete requires 1 MJ of energy. How much energy did it take to produce the dam? How long was the "energy payback time" for the dam?

The area of Lake Mead, formed by Hoover Dam, is 247 mi squared. Assuming that 250 W/m squared of sunlight falls on Lake Mead, how much energy could you produce if instead of the lake you installed solar cells that were 12% efficient?

- Physics -
**Anonymous**, Tuesday, October 4, 2011 at 11:39pm
fgs

## Answer this Question

## Related Questions

- math - The concrete for a sidewalk is being poured outside the perimeter of a ...
- english - Boulder Dam was the original name for Hoover Dam. The phrase is for ...
- Physics - In a hydroelectric dam, water falls 26.0 m and then spins a turbine to...
- Science asap! - Which of the following is not a process that forms metallic ore...
- math - Complete in Metric Conversions: Estimate the cost ($) of the concrete ...
- MAth - a concrete area measures 20ft on each side. the concrete slab will be 8 ...
- english - Our class had a test in Spanish this afternoon. find the nouns mark ...
- physics - A concrete wall of thickness one metre of a dam can withstand a side ...
- Geometry - concrete costs 105 per cubic yard. plato is making a rectangular ...
- math - A 4inch-thick concrete slab is being poured for a circular patio 14 feet ...