Canopus is 313 light years from Earth. How old is the light that we are currently seeing? Canopu is the brightest star.

What are the theoretical properties of a gas at a temperature of 0 kelvin?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

In a good thermo flask the main cause of heat loss is