Physics

Red light is used as danger signal because it is having high wavelength, less scattering ,hence can travel larger distances.

Food is cooked more quickly in a pressure cooker because at the higher pressure (1 bar/15 psi), the boiling point of water rises from 100°C (212°F) to 121°C (250°F). Since less water or liquid has to be heated, the food reaches its cooking temperature faster.

Momentum is related to mass and velocity.

Low Voltage Cables are used to supply power for use up to 1.1 kV.