What is the total heat content of 10 kg of ice at -23°C?

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?

What is friction? how does it affect the motion of an object?

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?