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Consider the following DC motor parameters:Rotor resistance, $R [Omega]$Motor constant, $k_t [mathrm{V/rpm}]$Inertia, $I [mathrm{kgcdot m^2]}$How do they scale with motor size? Do $R$ and $k_t$ depend on $I$?...
Asked on 05/22/2021
1 answerMy understanding is, given an optimal control problem, one can show that the optimal cost satisfies a Hamilton-Jacobi PDE and use dynamic programming to figure out the optimal control. However,...
Asked on 05/22/2021 by Isley
0 answerI'm designing a four-wheel velomobile as a small city bike with good weather protection. The top speed in the city is about 25km/h (7m/s). The total weight of the velomobile...
Asked on 05/21/2021 by Anders Carlius
1 answerIn case a plane stalls, what should stall first, the tip or the root of the Wing?Why?...
Asked on 05/20/2021
2 answerI was given the following formula to relate the change of area against the change of length of an electric wire with a Poisson ratio: $ {Delta A over...
Asked on 05/20/2021
1 answerAssume we have a pipe with a diameter of 10mm. Water is flowing through that pipe and we know that the water pressure at the 'open' end of the...
Asked on 05/19/2021 by emos-egavas
2 answerRecently I was thinking about home improvement, and one idea that is haunting me is that I could use some kind of refrigerator for gaming consoles and laptops. The obvious...
Asked on 05/19/2021 by The Dreams Wind
10 answerI have a mechanism where two parts are screwed and unscrewed and I wish to incorporate a system by which the number of screwing and unscrewing can be indicated. I...
Asked on 05/18/2021 by Twin Spooler
0 answerThe related Wikipedia article says:A breeder reactor is a nuclear reactor that generates more fissile material than it consumes. Breeder reactors achieve this because...
Asked on 05/18/2021
3 answerHere is what we are given. Time ranges from 0 to 10 hours, with t=5 being solar noon. $dot Q = 90Asin(pi t/10)$ Watts, where A is the solar...
Asked on 05/18/2021 by jorkz
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