A train is moving at 0.65c along a straight track at night. Its headlight produces a beam with an angular spread of 60 degrees, according to the engineer. If you are standing alongside the track (rails are 1.5m apart), how far from you is the train when you see its approaching headlight suddenly disappear?

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

The total amount of energy contained in an object