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Consider a 1.25 cm diameter carbon steel (1% C, k = 40 W/m-K) sphere to be cooled from 500oC to 100oC by a cooling air flow at 25oC with convection coefficient of 110 W/m2-K.
a) Determine the time required.
b) Determine the instantaneous heat transfer rate 2 minutes after the start of cooling.
c) Estimate the total energy transferred from the sphere during first 2 minutes.
A) A huge reservoir of air supplies a converging-diverging nozzle with throat and exit areas of 10 cm^2 and 25 cm^2 respectively. The reservoir pressure and temperature are 150 kPa and 20C. Determine the range of back pressure over which
On Earth, an astronaut weighs 145 pounds. Compute a) this astronaut's weight (in SI units) on the surface of Mars where the gravitational acceleration is 12.2 ft/s^2, b) her mass on Mars in British units, c) her mass on Mars in SI units, d) her mass ..
a 4-in. diameter disk shown weigts 20 lb. the disk is released at rest when theta30 degrees and rolls down the curved
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a pressure relief valve contains a poppet with a 4.20 cm2 area on which system pressure acts. during assembly a spring
Determine the maximum speed at which the car with mass can pass over the top point A of the vertical curved road and still maintain contact with the road.
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your group manager tells you that she has heard that a sphere of aisi 1020 hr steel will produce plastic flow in the
a particle moves along a straight line with a velocity v 200smms where s is in millimeters. determine the acceleration
in a tensile test for an alloy used for ballistic-missile launch tubes on boomer submarines the yield strength was
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