The two greatest reasons for the increasing demand for power are:
reduced efficiency in appliances
population growth
relaxation of government regulations
increased consumption
reduced resources
global warming
hole in ozone layer

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.