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Engineering

Trent

A college student wakes up hungry. He turns on the coffee maker (average wattage 1200 W), puts some oatmeal in the microwave oven (1450 W) to cook, puts a couple of slices of bread in the toaster (1146 W), and starts making scrambled eggs in the electric frying pan (1196 W). All of these appliances in his dorm room are supplied by a 120 V (rms) branch circuit protected by a 50 A (rms) circuit breaker.

Determine the total rms current in the current breaker.

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Engineering

Pooch

A baseball player catching a ball can soften the impact by pulling his hand back. Assuming that a 5-oz ball reaches his glove at 90 mi/h and that the player pulls his hand back during the impact at an average speed of 30ft/s over a distance of 6in. bring the ball to a stop, determine the average impulsive force exerted on the player's hand.

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Engineering

Luka Waller

What are the approximate solutions to the quadratic function x^2+6x-4=0

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Engineering

Paula Gilmore

What is the minimum hose diameter of an ideal vacuum cleaner that could lift a 14 kg dog off the floor?

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Engineering

Church

A waste stabilization pond is used to treat a dilute municipal wastewater before the liquid is discharged into a river. The inflow to the pond has a flow rate of Q=4,000 m3 / day and a BOD concentration of Cin = 25 mg/L. The volume of the pond is 20,000 m3. The purpose of the pond is to allow time for the decay of BOD to occur before discharge into the environment. BOD decays in the pond with a first-order rate constant equal to 0.25/day. What is the BOD concentration at the outflow, Cout of the pond, in units of mg/L?

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Engineering

Maurice Raymond

For three or more conductors, the required "percent fill" value for conduit and tubing is what %?

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Engineering

Rubi Fitzpatrick

What simple machines are used in a mechanical pencil

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Engineering

Fernanda Love

Semiconductors are primarily used in? 1) electromechanical controls 2) electronic controls 3) pneumatic controls

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Engineering

Pepper

Recall from an earlier lecture that the relationship between the current through an inductor and the voltage across it is given by What is the current through a 10 mH inductor if 1 V is applied across it for exactly 20 ms? Assume that initially there is no current through the inductor. Show your calculations in your engineering notebook.

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Engineering

Greta Wallace

Burn rate can be affected by: A. Variations in chamber pressure B. Variations in initial grain temperature C. Gas flow velocity D. All of the above

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Engineering

Jordon Krause

If you touch a downed power line, covered or bare, what's the likely outcome?

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Engineering

Graham Jacobs

given two continuous time signals x (t) and h (t), if their convultion is denoted by y (t), then the convultion of x (t-1) and h (t+1) is

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Engineering

Nora Callahan

Old cars used to have a purely mechanical device called a carburetor to draw fuel into the engine for combustion. (Modern cars accomplish this with electronic fuel injection systems.) To prepare for this discussion, do some online research about how carburetors function.

1. How does the Bernoulli Effect allow the carburetor to function?

2. What advantages and disadvantages do you see with only using a carburetor?

3. Why do you think modern cars use electronic fuel injection systems instead of carburetors?

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Engineering

Francisco Roach

A gardener is using a 60N wheelbrow to carry 250Nb bag. The force exerted to each handle by gardener is 42 N, The force and the moment at the wheels are respectivelty:

a. Fy=-226 N, M=25 N. m

b. Fy=84 N, M=0

c. FX=100 N, M = 226 N. m

d. Fy=226N, M=0 N. m

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Engineering

Siena Humphrey

A painting crew reported that a job is 35 completed. What fraction of the job remains to be done?

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