Engineering
Engineering, 11.07.2019 03:20, vanna7353

What speed should a galaxy move with respect to us so that the sodium line at 589.0 nm is observed at 589.6 nm?

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Physics, 03.07.2019 01:20, Naysa150724
Acosmic-ray particle has been observed (indirectly) with an estimated energy of 16 j, or about 1020 ev. suppose this particle was a proton (mc2109 ev). (a) what was the velocity of the proton relative to the earth? warning! most calculators do not carry around enough digits to give not the speed of the particle. express your result in terms of the fractional difference between the velocity of the particle and the velocity of light: an answer other than =c, but this is c (b) the diameter of the milky way is about 10s light years. if a photon and this proton raced across the galaxy by what distance would the photon win the race, as measured by an observer at rest with respect to the galaxy? (c) how long would it take the proton to cross our galaxy, as measured by a clock carried along with the proton?
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Geography, 07.11.2019 06:31, bribaby74
The spectrum of galaxy a and galaxy b both contain the h-alpha emission line, which is normally seen at 653nm. however, in galaxy a the line has an observed wavelength of 710nm, whereas in galaxy b the wavelength is 685nm. which galaxy is farther away?
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Physics, 11.11.2019 19:31, thelonewolf5020
The uss enterprise is stranded at the center of the galaxy with a damaged warp drive, so it is limited to speeds of 0.9995c or less. the earth is 25,000 light years from the center of the galaxy. this measurement is what would be measured by an observer in an inertial reference frame at rest with respect to the center of the galaxy. express all answers below to 4 significant figures. if the enterprise heads towards earth at top speed: a) what distance to the earth in light years will be measured by spock, on board the enterprise? b) spock will observe the enterprise covering this distance at a speed of 0.9995c. how long (in years) will it take to arrive at earth as observed from the enterprise's reference frame? c) how long will observers on the earth measure for this trip? d) check your answer to b) us ing time dilation and considering the time interval between the enterprise leaving the center of the galaxy and arriving at earth.
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