Physics, 20.03.2020 09:46 cadeduncan71
A car is parked in its driveway facing away from the street. Its owner backs the car out onto the street. As the car starts from rest and gains speed up to 5 mph backing out of the driveway, its 1. velocity points toward the front of the car, while its acceleration points toward its rear. 2. velocity points toward the rear of the car, and its acceleration is zero. 3. velocity points toward the rear of the car, and its acceleration points toward its rear. 4. velocity points toward the rear of the car, while its acceleration points toward its front. 5. velocity points toward the front of the car, and its acceleration points toward its front.
Answers: 3
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 00:00
Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.
Answers: 2
Physics, 22.06.2019 03:00
If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?
Answers: 2
Physics, 22.06.2019 06:30
The mini-refrigerator fire was most likely caused by what type of wiring?
Answers: 2
A car is parked in its driveway facing away from the street. Its owner backs the car out onto the st...
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