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Engineering

Jackson Underwood

Which term most closely matches the description? Any real or potential condition that cause injury, illness, or death to personnel: damage to or loss of equipment or property?

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Engineering

Tabitha Stephenson

Gas at a temperature of 250°C with a convective coefficient 75 W/m2·K flows through a packed bed of aluminum (2024) spheres that is used as a thermal energy storage system. If the initial temperature of the spheres is 25°C and the diameter of each sphere is 75-mm, find the time, in seconds, required to for a sphere to reach 85% of the maximum possible thermal energy as well as the surface temperature and the centerline temperature at this time, both in °C. Evaluate the properties of the aluminum (2024) at 500 K.

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Engineering

Valentin Rosales

You just purchased a 400-L rigid tank for a client who works in the gas industry. The tank is delivered pre-filled with 3 kg of air at a temperature of 25C. Assuming an atmospheric pressure of 98 kPa, determine the pressure reading if you connected a pressure gage to the tank.

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Engineering

Nikolai Ritter

The velocity field for a plane vortex sink is given by V¯ = (-q/2πr) e¯r + (K/2πr) e¯θ, where q = 6 m3/s/m and K = 3 m3/s/m. The fluid density is 1006 kg/m3. Find the acceleration at (a) (1, 0), (b) (2, π/2), and (c) (2, 0). (d), (e), (f) Evaluate ∇p under the same conditions.

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Engineering

Ariana Odonnell

Pure ethanol has an octane rating of about 113. E85, Which contains 35 percent oxygen by weight, has an octane rating of about

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Engineering

Jaelynn

Consider a series RC circuit at the left where C = 6 µ F, R = 2 MΩ, and ε = 20 V. You close the switch at t = 0. Find (a) the time constant for the circuit, (b) the half-life of the circuit, (c) the current at t = 0, (d) the voltage across the capacitor at t = 0, and (e) the voltage across the resistor after a very long time.

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Engineering

Dustin Bryant

Determine if the following errors are systematic or random. Justify your response. (a) Effect of temperature on the circuitry of an electronic measurement device. (b) Effect of parallax on the reading of a needle-type analog voltmeter. (c) Effect of using an incorrect value of emissivity in the readings of an infrared thermometer.

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Engineering

Guest

What is the color of an original apple

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Engineering

Solis

What are the indicators of ineffective systems engineering?

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Engineering

Messiah Fernandez

A force 25 N makes an angle of 30,45 and 75 degree with x, y and z axis. What should be the corresponding force vector?

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Engineering

Reese Keith

Describe the are of mechanical engineering

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Engineering

Saul Gaines

Fires most frequently occur in the

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Engineering

Caroline Snow

What is meant by the thickness to chord ratio of an aerofoil?

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Engineering

Mahoney

A sewer pipe 8 inches in diameter can carry 0.662 ft3/s when flowing at a depth of 4 inches.

a.) What flow rate can the pipe carry when flowing full?

b.) What would be the velocity when flowing at a depth of 4 inches?

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Engineering

Andres Weber

The radiator of a steam heating system has a volume of 35 L and is filled with superheated water vapor at 200 kPa and 200°C. At this moment, both the inlet and the exit valves to the radiator are closed. After a while it is observed that the temperature of steam drops to 80°C as a result of heat transfer to the room air, which is at 21°C. Assume the surroundings to be at 0°C.

Determine the entropy change of the steam during this process.

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