**Herong's Notes on Physics** - Version 3.21, by Dr. Herong Yang

List of Various Speeds

This section lists various speeds to give us a sense of scale about speed.

The list below provides some reference speeds to give us a sense of scale about speed:

299,792,458 m/s =1,079,252,850 km/h - Speed of light in a vacuum 220,000 m/s =790,000 km/h - Orbiting speed of Sun 29,790 m/s =107,200 km/h - Orbiting speed of Earth 17,043 m/s = 61,319 km/h - Speed of Voyager 1 spacecraft 8,000 m/s = 29,000 km/h - Orbiting speed of space shuttle 1,500 m/s = 5,400 km/h - Speed of sound in water 1,023 m/s = 3,683 km/h - Orbiting speed of Moon 980 m/s = 3,530 km/h - Speed of the fastest airplane 340 m/s = 1,225 km/h - Speed of sound in air at sea level 250 m/s = 900 km/h - Speed of passenger airplane 160 m/s = 575 km/h - Speed of the fastest train 108 m/s = 389 km/h - Speed of the fastest bird 64 m/s = 230 km/h - Speed of the fastest ant 36 m/s = 130 km/h - Speed of the fastest fish 33 m/s = 120 km/h - Speed of the fastest cheetah 20 m/s = 72 km/h - Speed of the fastest rabbit 12 m/s = 45 km/h - Speed of the fastest human running 2 m/s = 7 km/h - Speed of the fastest human waling 0.47 m/s = 1.69 km/h - Speed of the fastest turtle walking 0.00275 m/s =0.00990 km/h - Speed of the fastest snail

*Last update: 2014.*

Table of Contents

Introducion of Frame of Reference

Different Speeds Observed in Different Frames

Measuring Speed of Light - Roemer's Method

Measuring Speed of Light - Fizeau's Method

Measuring Speed of Light - Foucault's Method

Introduction of Special Relativity

Time Dilation in Special Relativity

Length Contraction in Special Relativity

The Relativity of Simultaneity