A person in good physical condition can put out 100 watt of useful power for several hours at a stretch, perhaps by pedalling a mechanism that drives an electric generator.

Which articulations allow for greatest range of motion?

Which subatomic particle has a negative charge

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?