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Engineering

The common-emitter current gains of two transistors are β = 60 and β = 150. Determine the corresponding common-base current gains. (b) The commonbase current gains of two transistors are α = 0.9820 and α = 0.9925. Determine the corresponding common-emitter current gains.

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Engineering

Steam enters a turbine operating at steady state at 600°F and 200 lbf/in^2 with a velocity of 80 ft/s and leaves as saturated vapor at 5 lbf/in^2 with a velocity of 300 ft/s. The power developed by the turbine is 200 horsepower. Heat transfer from the turbine to the surroundings occurs at a rate of 50,000 Btu/h.

a. Neglecting potential energy effects, determine the mass flow rate of steam, in lb/s.

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Engineering

At steady state, a reversible heat pump cycle discharges energy at the rate to a hot reservoir at temperature TH, while receiving energy at the rate from a cold reservoir at temperature TC. (a) If TH = 16°C and TC = 2°C, determine the coefficient of performance. (b) If 10.5 kW, 8.75 kW, and TC = 0°C, determine TH, in °C. (c) If the coefficient of performance is 12 and TH = 27°C, determine TC, in °C.

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Engineering

Against his financial advisor's advice, Frank has decided to invest his money in some risky stocks because he once made

quite a bit of money in the stock market. His decision illustrates

A. the representativeness heuristic

B. overconfidence

C. the availability heuristic

D. confirmation bias

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Engineering

A turntable A is built into a stage for use in a theatrical production. It is observed during a rehearsal that a trunk B starts to slide on the turntable 10 s after the turntable begins to rotate. Knowing that the trunk undergoes a constant tangential acceleration of 0.32 m/s2, determine the coefficient of static friction between the trunk and the turntable.

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Engineering

A stationary conductive loop with an internal resistance of 0.5 Ω is placed in a time varying magnetic field. When the loop is closed, a current of 5 A flows through it. What will the current be if the loop is opened to create a small gap and a 2-Ω resistor is connected across its open ends?

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Engineering

What happens when two identical waves are in inverted phase?

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Engineering

Consider the following grooves, each of width W, that have been machined from a solid block of material. (a) For each case obtain an expression for the view factor of the groove with respect to the surroundings outside the groove. (b) For the V groove, obtain an expression for the view factor F12, where A1 and A2 are opposite surfaces. (c) If H

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Engineering

True centrifugal casting is performed horizontally to make copper tube sections The tubes have a length 1.0 m, diameter 0.25 m, and wall thickness = 15 mm. (a) If the rotational speed of the pipe = 700 rev/min, determine the G-factor on the molten metal.

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Engineering

Think about all the things we have investigated in class so far this semester. Identify three examples of climate-related aspects of the Earth system that we have discussed in the class.

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Engineering

Which of the following is normally included in the criteria of a design?

1. Materials

2. Time

3. Budget

4. Efficiency

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Jasmine Baldwin

Engineering

500 flights land each day at San Jose's airport. Assume that each flight has a 5% chance of being late, independently of whether any other flights are late. Using Excel, calculate the probability of the following events. Turn in your spreadsheet. (a) 15 or fewer flights are late. (b) 30 or more flights are late. (c) Exactly 26 flights are late. (d) Between 10 and 20 flights are late. (e) Does our assumption of independence seem reasonable to you? Why or why not?

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Engineering

The rolling process is governed by the frictional force between the rollers and the workpiece. The frictional force at the entrance side is smaller than that at the exit side. This allows the roller to pull the workpiece towards the exit end. a) - True b) False

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Engineering

Women make up about 20% of the workforce in the aviation industry. With such a small percentage of female employees, JetBlue must guard against gender discrimination issues such as a glass ceiling. What is a glass ceiling?

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Engineering

Can a heat engine operating with only one thermal reservoir?

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