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- The star Alpha Centauri is 4.367 light vears from earth. What velocity do you need to travel at to reach this star in 1,447 years. Give your answer as a fraction of the speed of light (e.g. 0.406 for 0.406c) Round your answer to 3 decimal places. Add your answer Question 8 An electron is accelerated accross a voltage of 344kV. What is the momentuum of the electron? Use a value for the electron masss of 511 kevic. Give your answer in units of keWc (eg if the answer is 350 kevic write 350I Round your answer to 0 decimal places. Add your answer4_____________________ occurs when light travels out of a gravitational field, loses energy, and its wavelength grows longer. a. A magnetar b. Time dilation c. A gravitational redshift d. An X ray burst e. A pulsar wind
- 9. What is Hubble’s law?2. An astronaut measures the distance between two stars as being 14.7 light-year and she measures the time it takes to travel between the stars as 21.0 years. a. Identify whether the astronaut or an observer on one of the stars would measure the following 4 properties. Proper Distance Proper Time b. How fast is the astronaut travelling? Dilated Time c. What is the proper distance (length) between the stars? d. What is the contracted distance (length) between the stars? Contracted Length e. What is the proper time between leaving one star and arriving at the other star? f. What is the dilated time between leaving one star and arriving at the other star?Answer question 22 please
- 2. Determine the Schwarzschild radius and the average density of a black hole formed by the gravitational collapse of the Sun (m = 1.99 × 10 kg). 30 ad by the gravitational6. Consider a planet of mass m in orbit about a star of mass M. Since M >> m, we can assume the star is at rest. a) Show that the energy of the planet can be written as GMm E = 2mr? b) Now assume the planet is in a perfectly circular orbit. What is the energy in this case? c) Represent the energy obtained in part (b) on an energy diagram. (Draw and label very carefully.)3- Consider a binary star system in which the two stars are seen to be 1.50" apart. Determine the actual physical separation of those stars (in AU) if this binary system is located 9.50 1.y. from us.