When we say energy is lost during the production of electricity what do we really mean

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

An ideal gas is held in a container at constant volume. initially, its temperature is 5 degrees c and its pressure is 1.2 atm. what is its pressure when its temperature is 43 degrees c? answer in units of atm