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Engineering, 26.11.2019 05:31, scastillo8
Aplant manager is concerned her equipment may need recalibrating. it seems that the actual weight of the 15 oz. cereal boxes it fills has been fluctuating. the standard deviation should be at most 0.5 oz. in order to determine if the machine needs to be recalibrated, 88 randomly selected boxes of cereal from the next day's production were weighed. the standard deviation of the 88 boxes was 0.52. does the machine need to be recalibrated? conduct a hypothesis test at the 5% level.
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Engineering, 03.07.2019 15:10, theamandawhite
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Engineering, 04.07.2019 18:10, ahmedeldyame
Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.
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Engineering, 04.07.2019 18:10, abdirahmansoloman
Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?
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Aplant manager is concerned her equipment may need recalibrating. it seems that the actual weight of...
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