An airplane flying parallel to the ground undergoes two consecutive displacements. The first is 75 km 30.0 degrees west of north, and the second is 155 km 60.0° east of north. What is the total displacement of the airplane?

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?

What is an aquifer for science class