Physics, 31.07.2019 16:30 caroline1390
Astar is located at a distance of about 100 million light years from earth. an astronomer plans to measure the distance of the star by the parallax method. which of these statements best explains why the astronomer's method of measuring the star distance is inappropriate? a. at large distances, a red shift in the star's spectrum causes incorrect measurements. b. at large distances, a blue shift in the star's spectrum causes incorrect measurements. c. the parallaxes beyond a few thousand light years are too large to be used to measure distances. d. the parallaxes beyond a few thousand light years are too small to be measured with common instruments.
Answers: 1
Physics, 22.06.2019 07:30
30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve
Answers: 1
Physics, 22.06.2019 12:50
Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17Β°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.
Answers: 2
Physics, 22.06.2019 15:10
In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_
Answers: 3
Astar is located at a distance of about 100 million light years from earth. an astronomer plans to m...
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