What must be the height of water column that the atmospheric pressure can support in water barometer? [Density of water = 1000 kg/m', g = 9.8 m/s2, 1 atm = 1.01 10% N/m²].​

What happens to light waves from a star as the star moves away from earth?

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Why do astronauts in the space shuttle weigh less?