Engineering, 15.10.2019 21:30 Caixiayang3613
An experimentalist wishes to measure the resistance rs of a sample located down in a cryostat. two wires, each with resistance r = 10ω, carry an ac current i = 1.0 ma down into the cryostat, through the sample, and back up to ground. the voltage across the sample is measured with a differential amplifier. the actual sample resistance is rs = 0.10ω. 1.0ma r 10ω rs 0.10ω r 10ω − + vout (a) what is the differential voltage at the amplifier inputs? (b) what is the common-mode voltage? (c) suppose the amplifier is similar to the one you will build in lab, with gdiff = 10 and gcm = 0.50. what is the amplitude of the ac signal at vout? (d) if the experimenter assumed that her amplifier was ideal, with gdiff = 10 but gcm = 0, what would she report for the value of rs? (e) what is the minimum cmrr (= gdiff/gcm) her amplifier would need in order to measure rs to an accuracy of 1%?
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.
Answers: 2
Engineering, 04.07.2019 18:10
Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.
Answers: 1
Engineering, 04.07.2019 18:10
Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.
Answers: 2
Engineering, 04.07.2019 18:10
For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater
Answers: 3
An experimentalist wishes to measure the resistance rs of a sample located down in a cryostat. two w...
Biology, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00
English, 18.03.2021 02:00
Social Studies, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00
History, 18.03.2021 02:00
English, 18.03.2021 02:00
Physics, 18.03.2021 02:00
Arts, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00