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To maintain a freezer box at -40°C on a summer day when the ambient temperature is 27°C, heat is removed at the rate of 1.25 kW. What is the maximum possible coefficient of performance of the freezer, and what is the minimum power that must be supplied to the freezer?
The input to a certain filter is given by Vin(t)=2cos(10000pi*t-15deg) and the steady state output is given by Vout(t)=5cos(10000pi*t+25deg). Determine the (complex) value of the transfer function of the filter for f=5000 Hz.
The potential energy of a system of two particles separated by a distance r is given by the equation below, where A is a positive constant. U(r) = (A)/(r^11) Find the radial force vector F that each particle exerts on the other.
Find the electric field of a long line charge at a radial distance where the potential is 12V higher than at a radial distance \(r_{1}=1m\) where the magnitude of the electric field is 5V/m .
In a certain n-type region of a semiconductor in thermal equilibrium, there is a hole concentration with the following spatial distribution: po(x)=103(1 9×103x)cm 3 for0 x 10 4 withxincm Assume that in this region, the electron mobility and hole mob..
What is the primary source of distortion with a Class B amplifier. What are some ways the distortion can be minimized and discuss the tradeoffs that exist when implementing these distortion minimizing methods.
when the line was open-circuited, the measurement yielded an input impedance equivalent to a capacitor with capacitance of 40 pF. Find Zo of line, the phase velocity, and the relative permittivity of the insulating material.
Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related tree frogs in South America. If reinforcement of postzygotic isolation is occurring
Discuss what is meant by line spectra and what information can be gathered from a line spectrum plot. Discuss the similarities and differences between the Fourier Transform and the Laplace Transform.
What is the frequency for a periodic signal with a period of 2.5 ns 2.5 GHz 250 MHz 4.0 GHZ 400 MHz 2. Which decimal number is equivalent to 25 10 25 31 32 3. Convert the following decimal negative numbers to their 8-bit, 2's complement formulatio..
find the number of years that the country can go without constructing a generating plant before the load exceeds the generating capacity. Assum a 5% annual growth rate in demand.
compute the power loss in a transmission line with a resistance of 0.05 ohms/mile. Compute the power loss if 500kW of power is transmitted from a power generating station to cities at distances of 20,30,40....100 miles at 100v and 200v.
Two dc motors are compared. the first one is a 4hp dc motor which draws a current or 0.7A when the field is connected to a 150V source. the second, a 600 hp motor draws a field current of 5A when the field is connected to a 300V dc source.
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