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A slab of aluminum of area 2m^2 and with a mass 9 kg is lying on some insulation on the surface of the moon during daytime and is equilibrated at a temperature To= 140 degrees C. A shadow from a spacecraft that lands nearby suddenly cuts off the sun. How much does the temperature of the aluminum drop during the first minute ? Assume E=0.8 , and assume the outgoing heat flux is constant and determined by temperature To.
a large fireplace in a ski lodge has a glass firescreen which covers a vertical opening in the fireplace. the opening
a steady-flow compressor is used to compress helium from 15 psia and 70of at the inlet to 200 psia and 600of at the
1 current airbag regulations specify that they must only pass a test designed to protect a 175 pound male who is not
you are trying to loosen a bolt from a piece of metal with a wrench but fail. what kind of wrench should you look
a spring ab of constant k is attached to a support a and to a collar of mass m. the undeformed length of the spring is
a computer consists of an array of five printed circuit boards pcbs each dissipating pb 20w of power. cooling of the
a certain industrial process requires a steady stream of saturated vapor steam at 200 kpa at the rate of 2 kgs. there
given atmospheric air enters a 10m long 150-mm diameter uninsulated heating duct at 60 celcius and 0.04 kgs. the duct
a projectile is launched from point a with initial speed v0 and makes an angle ?n with the horizontal. it hits the
the a-36 steel axle is made from tubes ab and cd and a solid section bc. it is supported on smooth bearings that allow
The heating is to be done in a mixing tank by direct injection of the steam, all of which condenses. Determine the two inlet mass flows needed to meet the desired hot water flow rate.
a 500 kw compressor is being designed to operate on air in a space where the temperature is 300 k and pressure is 90
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