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The diameter of the sun is 1.39 x 106 km and is assumed to radiate with emissivity, e = 0.98, estimate its effective temperature. The distance between the sun and earth is about 1.495 x 108 km. The earth temperature is about 15 C. The solar constant on earth is assumed to be 1353 W/m2.
A motor has a disk mounted on its shaft. The disk has a diameter of 1 foot and weighs 60 pounds. Starting from rest, the motor rotates at 350 rpm after 5 seconds. If the motor has a 92% efficiency, determine the input power in watts.
steam at 1 mpa 630.2oc expands in an insulated piston cylinder assembly to 0.01 mpa. determine the maximum work kj done
using the mechanical energy balance estimate the time required for the water level to drop from an upper piece of tape
the loop transfer function of a single-loop negative feedback system isls gcsgs ks 2.5.5 3.2 s2s 1s 10s 30this
(a) Draw a schematic of the system and (b) determine if the inventor's claims are true.
a rigid insulated tank contains 0.6 kg of air initially at 200 kpa 20degc. the air is stirred by a paddle wheel until
the space between two 17-in.-long concentric cylinders is filled with glycerin viscosity 8.5 times 10-3 lbmiddotsft2.
a heat pump is used to maintain a house at 22 c by extracting hear from the outside air on a day when the outside air
a rigid tank contains an ideal gas at 1227 c and 200 k pa. the gas is cooled until the gauge reads 50 k pa. if the
for various fuels including at least methane ch4 octane c8h18 kerosene c12h26 methanol ch3oh ethanol c2h5oh and
the only information you have about a proposed site for a wind farm is that the wind blows at speeds above 25 ms 90 hrs
a machine part in a turbine-generator unit operates near room temperature and is made of astm a470-8 steel yield
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