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Suppose that the Earth acts as a blackbody of radius 6.4 × 106 m and effective temperature 240 K. (This is not the same as our surface temperature, due to our atmosphere's intervention. Most outgoing infrared ultimately leaves from the upper atmosphere.)
(a) What is the flux of energy leaving the Earth's surface for outer space?
(b) What is the total rate of emission of energy by the entire Earth?
(c) The flux of sunlight sweeping through space at our position is 1.4 kW/m2. Earth's temperature remains constant on the average. What fraction of the incident solar radiation is absorbed by the Earth? (Caution: The area intercepting the sunlight is not the same as the total area of the Earth that emits.)
determine how long it will take for the average temperature of the drink to rise to 20°C if the surroundingair and surfaces are at 25°C. Answer: 12.1 min
Water vapor at 300 C, 35 bars (state 1) expands to 5.0 bars (state 2) using an adiabatic throttling valve. The ambient is at T = 25 C, 1 bar. Simplify the energy conservation and availability balance equation for the current problem. Calculate the ex..
A pressurized steel tank is constructed with a helical weld that makes an angle α = 55° with the longitudinal axis (see figure). The tank has radius r = 0.6 m, wall thickness t = 18 mm, and internal pressure p = 2.8 MPa. Also, the steel has modulu..
A centrifual pump is used to raise water against a static head of 18 m. The suction and delivery pipes, both .15m in diameter, have respectively, friction head losses amounting to 2.25 and 7.5 times dynamic head. The impeller, which rotates at 1450 r..
with a mass of 1000 kg travels at 80kmh has a four-pad braking system. the microk between the brakes and the wheels is
A landfill operation uses a tractor to compact the waste. The tractor weighs 8 tons and has two tracks, each 2 ft 10 ft. Estimate the maximum compaction attainable in the landfill.
An insulated rigid container is separated into two parts using a partition that is free to move and the partition allows heat transfer without any energy storage by itself. Initially 2 kg of air at 5 bar and 350 K is contained on one side of the part..
A single-stage ideal regenerative steam cycle has a boiler pressure and temperature of 5000 kPa and 500 C, and a condensing pressure of 10 kPa. The extraction pressure is 500 kPa. If the regenerative heater is a closed heater with the condensate pump..
this question has popped up elsewhere on here but im a little dubious on some of the answers. anyway here goes any help
Sketch a flow net for the situation shown in Figure 8.7, and calculate the total discharge. Compare the result with the estimate made at the end of that chapter.
The ground state of dysprosium (element 66, in the 6th row of the Periodic Table) is listed as 5 Jg . What are the total spin, total orbital, and grand total angular momentum quantum numbers? Suggest a likely electron configuration for dysprosium.
The flow pattern at the exit of a radial centrifugal compressor impeller shows a jet-wake behavior. In order to estimate the blockage, we assume that the wake region has zero momentum and is of angular extending theta (per passage) at the impeller ex..
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