Physics and space
Physics and space: 6 free calculators & tools, including Travel time: speed, sound and light and Relativistic travel and time dilation. Explore formulas, examples and visual explanations.
Travel time: speed, sound and light
Compare a journey at everyday speeds, the speed of sound and the speed of light, with custom distances and speeds.
Relativistic travel and time dilation
Compare Earth and traveler elapsed time at a constant fraction of light speed.
Telescope eyepiece planner
Compare magnification, exit pupil and approximate sky coverage across your eyepieces.
Weight and jumping on other worlds
Compare weight force and ideal jump height while keeping mass and launch speed fixed.
Dew point calculator
Estimate dew point from air temperature and relative humidity, with optional surface comparison.
Terminal velocity and falling objects
Compare a falling object’s speed with air resistance and ideal vacuum free fall.