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A circuit board with a dense distribution of integrated circuits (ICs) and the dimensions of 120mm by 120mm on a side is cooled by a parallel flow of atmospheric air with a velocity of 2 m/s.
From wind tunnel tests under the same flow conditions , the average frictional shear stress on the upper surface is determined to be 0.0625N/m^2. What is the allowable power dissipation from the upper surface of the board if the average surface temperature of the ICs must not exceed the ambient air by more than 25 degrees C ?
The longest wavelength of light that can be absorbed by a particular harmonic oscillator is lumda = 1000 nm. What is the second longest wavelength that can be absorbed
The ground state for a quantum Hall system on a torus by fractional filling factor can be classified by the Chern number, which is why the Hall conductance is quantized. Is there another method or classification one can utilize to distinguish states?
Unpolarized light passes during two polarizers in turn with polarization axes at 58° to each other. What is the fraction of the incident light intensity that is transmitted?
Driving in your car with a constant speed of 13 m/s, you encounter a bump in the road that has a circular cross section, as indicated in the figure. If the radius of curvature of the bump is r = 29 m, find the apparent weight of a 59-kg person in you..
a charge of -3.89c is fixed at the center of a compass. two additional charges are fixed on the circle of the compass
During an adiabatic process, the temperature of 3.92 moles of a monatomic ideal gas drops from 485 oC to 205 oC. For this gas, find (a) the work done by the system, (b) the net change in internal energy of the system, and (c) the net heat absorbed by..
find the mass of Earth from the period T and the radius r of the Moon's orbit about the Earth. T=27.3 days and r=3.82E5 km. suppose the Moon orbits the center of Earth rather than the center of mass of the Earth-Moon system.
A rocket rises with constant acceleration to an altitude of 85 km, at which point its speed is 3.1km/s.what is the acceleration in m/s.
A well-insulated feed water heater (mixing chamber) mixes steam at 500oF with water at 80oF that flows at a rate of 8 lbm/sec. find the rate of entropy generation (in Btu/R sec) during the mixing process
What is the magnitude of the angular acceleration of a 25.0 kg disk with a radius of 0.800 m when a torque of magnitude 40.0 N-m is applied to it
consider a fixed and a moving system with their clocks synchronized and their origins aligned at tt0. a draw on a
A stones are thrown horizontally with the same velocity from the tops of two different buildings. Determine the ratio of the height of the taller building to the height of the shorter building
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