Define heat capacity of a substance.
Write the S. I unit of heat capacity.

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?