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a. For the system of Fig. 3.47, the resistance of each line cannot exceed 0.006 Ω, and the maximum current drawn by the load is 110 A. What gage wire should be used?
b. Repeat (a) for a maximum resistance of 0.003 Ω, d = 30 ft, and a maximum current of 110 A.
1. A steel bar, 20 mm in diameter and 200 mm long, with an emissivity of 0.9, is removed from a furnace at 455°C and suddenly submerged horizontally in a water bath under atmospheric pressure. Estimate the initial heat transfer rate from the bar.
Outside cool air at 15C and 40% relative humidity is mixed with inside air taken near the celling in a room at 32C and 70% relative humidity. Determine the relative humidity and temperature of the resultant air stream if the outside flow rate is 40 m..
you are trying to loosen a bolt from a piece of metal with a wrench but fail. what kind of wrench should you look
A Wilson-Hartnell governor is illustrated in given Figure. In this, the balls are associated by two springs that are known as main springs. The main springs are symmetrically arranged on either side of the sleeve.
You are a supervisor for a complex design project, and are aware of the NCEES code rule according to which engineers may coordinate an entire project provided that each design component is signed or sealed by the engineer responsible for that desi..
Estimate the heat transfer coefficient, h, associated with Points A, B, C, D, and E in Figure 10.4. Which point is associated with the largest value of h? Which point cor- responds to the smallest value of h? Determine the thickness of the vapor bla..
a square-shaped board 1 m 1 m with weight of 16 n slides down a 30 o - inclined ramp with a terminal velocity of 22.5
The condition where (at most) one thread is allowed access to a resource that can not be shared. If a second thread wishes access to the resource while the first thread is using it, the second thread is made to wait until the first thread is finis..
Consider a refrigerator that accepts 15 kW of heat in the evaporator and rejects 19.76 kW of heat from the condenser. The compressor requires an input of 5 kW of power and loses 0.24 kW of heat. Determine the coefficient of performance for this refri..
Calculate the force of attraction between a K+ cation and a O2- anion, the centers of which are separated by a distance of 1.5 nm.
In Sample Problem 13.2, change the area of the steel bar to 1200 mm2. If the load P = 700 kN is applied and then removed, determine the residual force in each bar.
The internal diameter of the pressure vessel is 300 mm and the pressure in the vessel varies from 0 to P kPa gauge. Assuming that the bolts are initially tightened to 80% of their yield strength determine the maximum value of P that would not caus..
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