The visible surface of the Sun has a temperature of about 6000K. Calculate the energy per square meter emitted by the Sun’s surface.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is