Engineering, 19.03.2021 18:00 colebash88
A miner is trapped in a chamber having 3 doors. The first door opens in a tunnel that takes the miner to safety after 2 hours. The second door opens in a tunnel that returns ours. The third door al chamber after 3 hours. Suppose that the miner always chooses any of the doors with equal probability (he does not remember or mark doors). Let random variable X be the time it takes for the miner to reach outside of the mine safely. Calculate the expected time to reach safety, E[X], and simulate the process to justify your calculated result.
Answers: 1
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
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Engineering, 04.07.2019 18:10
Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?
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A75mm diameter shaft is supported in a journal bearing 75mm long with a diametral clearance of 0. 1mm. it supports a radial load of 1000 n and is lubricated with sae 50 oil at 70°c. find the friction torque and the power loss when the crankshaft rotates at 2900 rev/min.
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Engineering, 06.07.2019 02:30
Around steel bar, made from material with a yield stress of 750mpa, is loaded so that it has stresses co locations of maximum normal stress and maximum shear stress. use maximum shear stress and maximum distortion energy theories to calculate the safety factors for initial yielding failures.
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A miner is trapped in a chamber having 3 doors. The first door opens in a tunnel that takes the mine...
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