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Application: Ground resistance of electrodes. A ground electrode is built in the form of a hemisphere, of radius a = 0.1 m, buried in the ground, flush with the surface as shown in Figure 7.39. Calculate the contact resistance (resistance between the wire and surrounding ground). You may assume the ground is a uniform medium infinite in extent, with conductivity σ= 0.1 S/m. Hint. Calculate the resistance between the hemisphere and a concentric conducting surface at infinity. Note. This is an important calculation in design of lightning and power fault protection systems.
What is the minimum refractory period? If the second pulse is applied before the minimum refractory period, how much larger is the stimulus magnitude that is needed to generate an action potential?
Make a list of the risks to society from the use of each type of power plant. With this knowledge, which type of radioactive decay has the net effect of changing a neutron into a proton? Which type of decay has the net effect of turning a proton i..
A mixture containing 98 mol% methanol and 2 mol% of an inert contaminant is available as a feed to a formaldehyde plant. The fresh feed to a process consists of 1000 kmol/h of this mixture along with 200 kmol/h of oxygen. All of the oxygen is consume..
Assuming adiabatic operation and negligible changes in kinetic and potential energies, determine the turbine efficiency, i.e., the ratio of actual work of the turbine to the work of a turbine operating isentropically from the same initial conditio..
A flat slab of Douglas fir wood 50.8 mm thick containing 30 wt% moisture is being dried from both sides (neglecting edges and ends). The equilibrium moisture content at the surface of the wood due to the drying air blown over it is held at 5 wt% mois..
The petrol used for petrol engine contain, 84% carbon and 16% hydrogen. The air supplied is 80 % of that theoretically required for complete combustion. Assuming that all hydrogen is burnt, and that carbon burns partly to CO and par..
Calculate the maximum allowable particle size as a function of the bulk glucose concentrations of 5 g/ l and 50 g /l. For medium containing 30 g /l glucose, calculate Rmax at cell loading of 5 and 30 wt%.
A 100-liter fed-batch fermenter was successfully operated for 200 h using an aeration rate of 14 l/s and a 5 W agitator. It is proposed to scale the fermentation up to 10,000 liters. What agitator power consumption is required?.
What force must the biceps generate to hold the forearm in static equilibrium?
Estimate a value for the total project cost that will give 98% confidence that the project can be carried out within the amount estimated.
Justify based on physical considerations the following statement: "At large distances, the magnetic dipole of the square loop is the same as that of a circular loop of identical area."
Monczka-Trent Shipping is the logistics vendor for Handfield Manufacturing Co, in Ohio. Handfield has daily shipments of a power-steering pump from its Ohio plant to an auto assembly line in Alabama. The value of the standard shipment is $250,000...
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