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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 ?
A certain organ pipe, open at both ends, produces a fundamental frequency of 296 Hertz in air. find what fundamental frequency will it produce
A container of hot water at 80 degrees cools to 79 degrees in 15 seconds while it is placed in a room that is t 20 degrees. Use newton's law of cooling to estimate the time it will take for the container to cool from 50 degrees to 49 degrees.
Calculate how long a de-orbit burn must last in minutes and secondsto achieve the Shuttle’s change in altitude from 212 miles to60 miles at perigee.
Two 8.0mm×8.0mm electrodes with a0.10-mm-thick sheet of Mylar between them are attached to a 9.0V battery. What is the charge before and after the Mylar is withdrawn
A 150-? resistor is connected in series with a 0.250-H inductor. The voltage across the resistor is vR=(3.80V)cos[(720rad/s)t]. Derive an expression for the circuit current
A flat piece of glass is supported horizontally above the flat end of a 11.0 cm long metal rod that has its lower end rigidly fixed. The thin film of air among the rod and the glass is observed to be bright when illuminated by light of wavelength 500..
The position of the particle as a function of time expressed by the equation position vector r (t) = (at2 + bt) i + (ct + d) j with a, b, c, and d are constants that have the appropriate dimension. Determine the particle displacement vector between t..
Cars A and B move in the same direction in adjacent lanes. For that value of aB, how many times are the cars side by side
illustrate the cross section view of n-channel MOSFET. What is the function of charge inversion layer
A wheeled cart with a mass of 0.50 kg is rolling along a horizontal track at a constant velocity of 2.0 m/s, What is the maximum compression of the spring
They are dropoped simutaneously from a cliff. Compare their accelerations at midpoint in their fall. Does one mass reach the midpoint before the other?
Determine the magnitude of the centripetal acceleration of an object on the surface of the Earth at latitude of 61.5°. Consider the Earth to be a sphere of radius R = 6.38 x 106
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