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Using reliable sources, write a summary of the concept of energy return on energy invested (EROEI). Provide some estimates of the EROEI for petroleum extraction from tar sands. Please also report on the EROEI of shale natural gas.
The outfielder throws a baseball with an initial speed of 10 m/s. An infielder catches the ball at the level 1 m lower, what work is done by air resistance
A charge of 0.43 C is spread uniformly throughout a 36 cm rod of radius 7 mm. What are the volume and linear charge densities
Two identical particles, each with a mass of 4.5 mg and a charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 at an instant, How far apart will they be when closest to one another
If you swim from one point at the edge of the pool to another, along a straight line, what is the longest distance you can swim
The mean (average) of their squares
An engineer has designed a machine to produce electricity by using the difference in the temperature of ocean water at different depths. what is the maximum efficiency of this machine
How much horizontal force should a sprinter of mass 57.0 exert on the starting blocks to produce this acceleration.
Give a definition of "laissez faire" economics. (An economic doctrine that opposes government regulation of or interference in commerce.) Explain why do you think this was the dominant political and legal view in the 1800s and early 1900s?
a child makes a ramp to push his toy dump truck up to his sand box.If he uses 5 newtons of force to push his 12 newton truck up the ramp
A parallel-plate capacitor is made from two aluminum-foilsheets, each 4.0 cm wide and 5.00 mlong. What is the capacitance of this capacitor
A small space telescope at the end of a tether line of length L moves at linear speed v about a central space station. What will be the linear speed of the telescope
An archer puts a 0.26 kg arrow to the bowstring. An average force of 213 N is exerted to draw the string back 1.3 m. unless otherwise directed, suppose that air resistance is negligible. Illustrate energy bar graphs to solve the problem.
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