Physics, 20.11.2019 02:31 SmokeyRN

At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate heat input of the second. the operating temperatures of the first are 740∘c and 440 ∘c, and of the second 415 ∘c and 270 ∘c.
part a
if the heat of combustion of coal is 2.8×107j/kg, at what rate must coal be burned if the plant is to put out 950 mw of power? assume the efficiency of the engines is 65% of the ideal (carnot) efficiency.
express your answer using two significant figures.
part b
water is used to cool the power plant. if the water temperature is allowed to increase by no more than 4.5∘c, estimate how much water must pass through the plant per hour.
express your answer using two significant figures.

Answers: 1

Show answers

Other questions on the subject: Physics

Physics, 22.06.2019 05:10, blondesaturn

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Answers: 3

continue

Physics, 22.06.2019 05:40, izzyisawesome5232

An ideal polarizer with its transmission axis rotated 30 degrees to the vertical is placed in a beam of unpolarized light of intensity 10w/m^2. after passing through the polarizer, what is the intensity of the beam? a. 8.7 w/m^2 b. 7.5 w/m^2 c. 5.0 w/m^2 d. 10 w/m^2 e. 2.5 w/m^2

Answers: 1

continue

Physics, 22.06.2019 11:00, vanvalenpeyt

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

Answers: 3

continue

Physics, 22.06.2019 17:30, babygreg2001p97abr

Current from a charged capacitor lights a bulb. as time goes on the brightness of the

Answers: 3

continue

You know the right answer?

At a steam power plant, steam engines work in pairs, the heat output of the first one being the appr...