Physics, 21.10.2019 20:00 emmadownum
You observe a spectral line of hydrogen at a wavelength of 522.5 nm in a distant galaxy. the rest wavelength of this line (known as hβ or hydrogen beta) is 486.1 nm. what is the radial velocity of this galaxy in kilometers per second? is it moving toward or away from earth?
Answers: 2
Physics, 21.06.2019 17:00
Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.
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Physics, 21.06.2019 21:30
Apendulum has a mass of 1.5 kg and starts at a height of 0.4 m. if it is released from rest, how fast is it going when it reaches the lowest point of its path? acceleration due to gravity is g = 9.8 m/s2. a. 2.8 m/s b. 0 m/s c. 5.9 m/s d. 4.3 m/s
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Physics, 22.06.2019 08:50
You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?
Answers: 1
You observe a spectral line of hydrogen at a wavelength of 522.5 nm in a distant galaxy. the rest wa...
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