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An electric scooter would be ideal. Bicycles suffer from a peculiar characteristic of humans, namely that they produce power at a ridiculously low RPM. Power is force times speed. If speed is low, to get any useful power, you need huge amounts of force. The rotational equivalent is that power is torque times RPM, very similar to the linear equation. Let's ...


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A self-contained solar-powered car is not viable. There simply isn't enough area for the solar panels. Take a Honda Civic as an example: it's got about eight square meters of top surface that solar panels could be installed on, for a peak theoretical generation of 8 kW. That same Honda Civic has a 92-kW engine, meaning that for each second of maximum ...


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The favored anode catalyst in a hydrogen fuel cell is platinum(1) or another platinum-group element (e.g. palladium). The catalyst is required in small quantities for an individual fuel cell but of course this demand scales up linearly with the number of fuel cells you want to produce. There is ongoing research into development of alternative anode ...


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In general, any two or three wheeler with a one-speed transmission and no manual clutch, or with a two-speed automatic transmission, and a ~50cc engine, is a moped. Some states don't require tag and insurance but most states require a driver's license. Also, the top speed of the moped is likely required to be 30 MPH. Note that only "most states" require a ...


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Specific to electric vehicles in the USA, the Union of Concerned Scientists created a good comparison in 2009. Here's the latest update, from 2018-03-08: https://blog.ucsusa.org/dave-reichmuth/new-data-show-electric-vehicles-continue-to-get-cleaner Based on data on power plant emissions released in February 2018, driving on electricity is cleaner than ...


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