

But heavier modes of transport – trucks, buses, airplanes and ships – need more power than batteries can currently deliver. If you remember the vis viva equation as well as the pythagorean memory device for hyperbolic orbits, it's not hard to patch conics.In Europe, electric vehicles surpassed 10% of the total passenger cars sold in 2020, up from 4% in 2019.

Using Google or Wikipedia it's easy to find planetary radii, orbital radii and masses for various bodies. I used this same spreadsheet to calculate most the numbers is my own delta V map. It interesting to change the apoapsis and periapsis of parking orbits about a planet. It can give you delta Vs for various scenarios. I've made a Hohmann spreadsheet that uses the equations I've given. $$ \Delta v = v_\text$ would be gravitational constant times mass of Mras. In that way, it is a strong mathematical analogy to distance traveled by car. BUT, the calculation for the delta-v is still linear. You and I neglect this because our energetic budget is small compared to the weight of the car in gas. As your gas tank is full it cases more rolling friction with the road, so your car is more efficient with a nearly empty gas tank. We tend to think of fuel as proportional to distance driven. But there is an interesting criticism of this point - that the "distance" on this map doesn't scale linearly with fuel needed. If I can't add segments to calculate the total distance, then it's not a "map". The idea of a Delta-v map would be useless if it was not additive. This sequence of points just reflects my own intuition. Not all of these are fully necessary, so other people will take a different route to explaining it.

Non-ideal factors going from surface to orbit.

