Bruce Wayne has hit some hard times, and Alfred is trying to cut down on expense

Question

Bruce Wayne has hit some hard times, and Alfred is trying to cut down on expenses in the Batcave by having the Flash power the Batcomputer by running on a voltage generating treadmill. The treadmill generates 87.00 Volts/MPH that the user is running, A 0.10 km long wire with a diameter of 11.00 mm made of Batium connects the treadmill to the bat computer. Batium is a Batman branded, extrinsic n- type semiconductor that under an electric field of 549.00 V/m has a drift velocity of 115.00 meters per second. Assume there are 3.80 x 10 free electrons in the Batium wire. Additionally, assume the Batcomputer must be supplied with 504.00 V at a current of 37 Amps to operate, how fast does the Flash have to run in order to power the Batcomputer? You may assume there are no other materials generating resistance in the circuit. Image Source: http://lylesmoviefiles.com/wp-content/uploads/2015/12/dc-icons-the-flash-figure-review-stepping-on- treadmill.ipg Remember: The sum of voltages in a loop equals zero

Explanation / Answer

In the case of track running the frictional force , he has topush the ground in backward direction

and the frictional force acts in forward direction.

But, in the case of treadmill , he has to push the base inforward direction and the frictional force acts

in backward direction. So, he suffered from bachache.

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