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A square (10 mm x 10 mm) silicon chip is insulated on one side and cooled on the opposite side by atmospheric air in parallel flow at U8 = 20 m/s and T8 = 24°C. When in use, electrical power dissipation within the chip maintains a uniform heat flux at the cooled surface. If the chip temperature may not exceed 80°C at any point on its surface, what is the maximum allowable power? What is the maximum allowable power if the chip is flush mounted in a substrate that provides for an unheated starting length of 20 mm?
A spring stiffness k= 500 n/m is mounted against a 10 kg block. if the block is subjected to a force of 1 KN determine the velocity of the block at s=0.3 m when s=0, the block is at rest and the spring is uncompressed. The coefficient of fricktion is..
20 kg of water at 200 kpa with a quality 25 is heated under a constant volume process until its pressure reaches 400
The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. Determine the fluid gage pressure that must be maintained in the reservoir.
a piston-cylinder device contains 0.15kg of air initially at 2mpa and 350oc. the air is first expanded isothermally to
how do i calculate the rate of change of heat with the cylinder, and the vertical temperature distribution along the cylinder's wall.
a rigid tank having a volume of 0.1 m3 initially contains water as a two-phase liquid-vapor mixture at 1 bar and a
a simple turbojet is operating with a compressor pressure ratio of 8.0 a turbine inlet temperature of 1200 k and a mass
for a crystal with a cubic structure sketch its unit cells showing the following crystallographic directionsa 011 b 212
carbon monoxide at 77f 1 atm enters and insulated reactor operating at steady state and burns with air entering at 77 f
nitrogen n2 initially occupying 0.1 m3 at 6 bar 2478c undergoes an internally reversible expansion during which pv 1.20
given a rectangular sample of ductile iron 60-40-18 with cross sectional dimensions 0.8 in x4 in calculate the stress
A balloon is inflated with helium gas to a pressure of 100 kPa gauge. The volume of the balloon is 0.4m^3. The initial temp is 20 degrees C. The helium gas can be treated as an ideal gas. the atmospheric pressure is 101.3 kPa
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