Physics, 04.11.2019 23:31 decoreyjpaipxv
George has a mass of 30 kg. he sits 1.4 m from the axis of rotation of a see-saw. if susie has a mass of 27 kg, how far from the axis of rotation should she sit on the other side of the see-saw to keep it in static equilibrium? assume the center of mass of the see-saw is above the axis of rotation. g
Answers: 2
Physics, 21.06.2019 23:00
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?
Answers: 1
Physics, 22.06.2019 11:00
Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?
Answers: 2
Physics, 22.06.2019 14:30
Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?
Answers: 1
George has a mass of 30 kg. he sits 1.4 m from the axis of rotation of a see-saw. if susie has a mas...
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