27.4: Proposals to mine resources from the Moon have included suggestions that the goods could be launched toward Earth using an electromagnetic railgun, also called a mass driver, which is essentially an apparatus like that described in the preceding problem, with a cargo capsule incorporated into the conducting bar. With rails spaced 1.00 m apart and a magnetic field of 0.877 T, what emf would be needed to achieve a speed that’s 50% greater than lunar escape speed? Wolfson, Richard. Essential University Physics, Volume 2 (p. 541). Pearson Education. Kindle Edition.