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An experimental power source for spot welding is designed to deliver current as a ramp function of time: I = 100,000 t, where I = amp and t = sec. At the end of the power-on time, the current is stopped abruptly. The sheet metal being spot welded is low carbon steel whose unit melting energy = 10 J/mm3 . The resistance R = 85 micro-V. The desired weld nugget diameter = 4 mm and thickness = 2 mm (assume a disc-shaped nugget). It is assumed that 1/4 of the energy generated from the power source will be used to form the weld nugget. Determine the power-on time the current must be applied in order to perform this spot-welding operation.
Calculate the power needed to overcome this drag force if there is no wind.
a well-insulated piston cylinder contains 5kg of saturated mixture water at 150kpa. initially three-quarter of the mass
air is compressed from an initial temperature of 20 degc and pressure of 100 kpa to a final pressure of 1000 kpa. the
Enter the data into a spreadsheet. and construct a standard-additions plot of the data.
Derive the consistent- and lumped-mass matrices of the tapered bar element (which deforms in the axial direction) shown in Fig. 12.13. The diameter of the bar decreases from D to d over its length.
Determine the force in member CG of the loaded truss, repeated here from Prob. 4/27. The four external reactions at A, B, E, and F are equal in magnitude and are directed perpendicular to the local suppporting surfaces.
water flows in a circular pipe. at one section the diameter is 0.3 m the static pressure is 260 kpa gage the velocity
A water purification plant uses one tank for chemical sterilization and a second, larger tank for settling and aeration. Each tank is equipped with two sensors that measure the height of water in each tank and the flow rate of water into each tank..
What is the production rate, in kilograms of crystals per hour per cubic meter of mother liquor? What rate of nucleation, in number per hour per cubic meter of mother liquor, is needed?
A cylindrical steel pressure vessel with mean diameter 1.5 m
If he wishes to use all the allotted land and his entire budget for cultivating these two crops, how many acres of each crop should he plant?
The lock is 8 m wide. Calculate the resulting forces on this pair of doors, and draw a free-body diagram of this pair of doors showing the opposing pressure distributions
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