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In natural-convection problems, the variation of density due to the temperature difference ?T creates an important buoyancy term in the momentum equation. If a warm gas at TH moves through a gas at temperature T0 and if the density change is only due to temperature changes, the equation of motion becomes
Show that the ratio of gravity (buoyancy) to inertial forces acting on a fluid element is
where L and V0 are reference lengths and velocity, respectively.
write an assembly language subroutine that implements a 1-second delay using the tcnt timer. include both an
The rectifier feeds a load of 200 W and is fed from the linevoltage (120 Vrms, 60 Hz) through a transformer. The diodesavailable have a 0.7 V drop when conducting. If the designer opts for a half wave rectifier circuit
The purchasing department has found an excellent global positioning system circuit card in Germany that can provide your firm with a competitive advantage in the marketplace.
A battery is charged. The relationship between the charging current, i amperes and the time, t hours passed, is given by the formula:
An inverting amplifier is configured for a gain of -(6/4) using an opamp that has a 2mV internal offset voltage. (You may consider the opamp ideal otherwise). For what input voltage the output of the amplifier will be zero.
Determine the armature current buildup as a function of time, if the generator voltage constant Kg = 50 V per field ampere at rated speed.
A sphere of radius a is given. Choose any point on the sphere.
Design the circuit and select the appropriate components for that circuit to fulfill the requirements of the device. Verify your design by MATLAB simulations
Consider a gsm uplink.the ms has 100 mw transmit power and the sensitivity of the bs receiver is -105 dbm.the distance between the bs and ma is 500 m.the propagation law follows the free space law up to a distance of dbreak=50m
The kilowatthour-meter of a home is read once a month. For a particular month, the previous and present readings are as follows:
Find the Fourier transform X(eiω) of x[n]. Find the N-point DFT X [k] of the finite-length sequence x[n). Find the DFT of x[n] for the case ω0 = 2πk0/N, where k0 is an integer
Two machines and a lighting load are connected in parallel to a 220 V, 60 Hz line. The first machine uses 40 kW of power at 0.81 power factor lagging. The second machine uses 27 kVA at 0.93 power factor leading. The lighting load consumes 13 kW.
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