Physics in Science Fiction
The following is a "slides and notes" version of a talk,
written and presented to the Johns Hopkins University Society of Physics
Students by Andrew E. Love
Jr, a long-standing subscriber, and frequent contributor, to the
Larry Niven mail list.
I got a little carried away with calculating the differences between a planet's gravity and the pseudo-gravity on Ringworld. Here's a plot of the time a rocket would spend in flight if launched straight up with various initial speeds - not too much different with low speeds.