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Cooling air at 25C flows through the fins arrant creating a heat transfer of 28W/m^2 K. Using 175W/mk for the thermal conductivity of aluminum, estimate the temperature of the base of the semiconduc
What is the allowable heat dissipation rate if the temperature of the aluminum plate must not exceed 70C use k=180 W/mk for aluminum.
A fan blow 25 degrees C air through the array creating a heat transfer coefficient of 110W/m^2K. if the temperature of the chip cannot exceed 75 degree C. what is the allowable power rating of the c
Three particles are sliding along a flat frictionless surface, Ma = 0.4 kg, Mb = 0.5 kg, and Mc = 0.4 kg. How fast will ball c be traveling after all collisions have ceased?
Determine the silicon temperature and the electric power produced by the solar cell for an air velocity of 4 m/s parallel to the long direction.
A. for a supply air volumetric flow rate of 40m^3 /min, determine the supply air temperature T in degrees celsius and the relative humidity.
Find: a) Draw a schematic of the power cycle, b) Determine the maximum thermal efficiency that could be expected for this power cycle.
Find: a) The minimum cost to operate the heat pump for a day when the inside temperature is 20oC. b) Plot the minimum cost to operate the heat pump for a range of inside temperatures of 18 to 23oC.
Construct an S-N curve applicable for zero mean stress. Assume that the part is a solid circular rod that has a diameter of 1.0 inches, has a machined finish.
The air temperature in the tank at the final state is 77 degree C. Determine (a) the mass of air that has entered to the tank; (b) the amount of heat loss during the process.
Knowing that the panel is initially at rest, determine the components of the reaction at A after the panel has rotated 90 degrees.
A 20kg uniform cylindrical roller, initially at rest, is acted upon by a 90N horizontal force. Knowing the body rolls without slipping, determine velocity of its center G after it has moved 1.5m.
Sum of losses coefficients (valve and line): 6.5. What force (lbf) is exerted on the valve as a result of the fluid flowing though it?
Obtain a state-space representation of the system. The external force u applied to mass m is the input and the displacement y is the output of the system.
A heat pump in a home is to serve as a heater in winter and an air conditioner in summer. Use the reversible Carnot cycle to determine the minimum power required to drive the heat pump.
Find the rate of exergy destruction for each process in the cycle. Where does the maximum rate of exergy destruction occur?
What is the total distance that the block travels before coming to a stop? Specify your answer in meters to 2 decimal places.
For the water, determine (a) the quality at the initial state, (b) the temperature at the final state, in degrees F, and (c) the heat transfer, in Btu, Kinetic and potential energy effects can be ig
Determine, a) the minimum mass flow rate of water that must be diverted from the river and through the condenser (kg/s), b) the temperature of the river downstream (Tdown) of the power plant.
Determine the total rate of coal consumption (kg/s) Qin = mfuel * heating value of fuel, the fraction of the total coal mass used to operate the super-heater (%).
A 5.0 kg Steel block is resting on a *horizontal table*. The coefficient of static friction (us) is 0.75 and the uk is 0.57. What minimum force is needed to start this block moving?
A 40.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance 1.10-m from the 30.0-kg child. How long is the beam?
Calculate the collection efficiency of this system for 12.0 μm particles. Suppose you wish to clean an aerosol stream containing unit density particles which are log-normally distributed.
If the above aerosol flows through the device, calculate the overall number collection efficiency, and the overall mass collection efficiency.
Estimate the mass of ozone inhaled into the lungs by a moderately exercising individual over an eight hour period at a concentration equal to 0.080 ppm.