An airplane (M = 5000 kg) is pulling a glider (m = 200 kg) along a runway. The tension in the cable is 1400 N. If they are accelerating at 7 m/s^2, what is the
strength of the airplane's thrust?

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?

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c