A steam generator is a device that converts water into steam by capturing radiant heat from hot gases. Consider a 15 foot cubed steam generator, all sides made up of water tubes and a “fire ball” 6 ft. in diameter at 4000ºF at the center. If the water tubes have a surface temperature of 600ºF and an emissivity of 0.7, determine the heat transfer to the water from the combustion gases. Assume the fire ball acts as a black body.
What will be an ideal response?
Referring to the sketch and the equivalent circuit, calling area 1 the four sides of the
boiler, surface 2 top and bottom, and surface 3 the fireball, situated in the center of the
cube, the net heat transfer can be written,
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Stars of type ________ should last about ten billion years on the main sequence
Fill in the blank(s) with correct word
____ is the brightest star in the constellation of Ursa Majoris
a. ? Ursa Majoris b. ? Ursa Majoris c. ? Ursa Majoris d. Wrong! Ursa Majoris is the name of the brightest star.
Calculate the minimum average power output necessary for a person to run up a 12.0 m long hillside, which is inclined at 25.0° above the horizontal, in 3.00 s. You can neglect the person's kinetic energy
Express your answer in horsepower. (1 hp = 746 W) A) 1.24 hp B) 2.93 hp C) 1.86 hp D) 0.740 hp
One difference between a microscope and a telescope is that the image formed by the objective is
A. real for the microscope but virtual for the telescope. B. virtual for the microscope but real for the telescope. C. real for both, but the image is enlarged for the microscope and reduced for the telescope. D. real for both, but the image is reduced for the microscope and enlarged for the telescope.