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- An astronaut is in space at the midpoint between two stars of equal mass. Everything else is infinitely far away. What is the weight of the astronaut? Explain your answer.Four research teams measured the rotation period of a newly detected neutron star, and what each team wrote in its team notebook is shown in the table below. Suppose a later and more reliable measurement gives 0.250 s for the period of the same star. Decide which of the earlier measurements was the most accurate. and which was the most precise. most precise measurement what was written most accurate team in the notebook measurement "0.270st 1.0% "0.25s "0.290s t0.002s" D. "between 0.19s and 0.23sWhat makes us think that the star system Cygnus X-1 contains a black hole? A, It emits X rays characteristic of an accretion disk, but the unseen star in the system is too massive to be a neutron star. B. No light is emitted from this star system, so it must contain a black hole. C. The fact that we see strong X-ray emission tells us that the system must contain a black hole. D.Cygnus X-1 is a powerful X-ray burster, so it must contain a black hole.
- 5. We observe an increase in brightness of a star that is 5.81×10¹⁹ m away. How long ago did the actual increase in brightness take place, in years? Find the time that is required for light to reach the Earth.Which of the following statements about time are true? Pick all that apply. There is an "absolute" time that would be seen with the same value everywhere in the universe. and must be included in precision calculations of physics. You could describe the physics of Newton consistently at any time with the same ideas. We think that time passed the same way at the beginning of the universe as it does now, and that it enters the description of physics in the same way everywhere if we include the effects of gravity on time. According to Newton and Galileo, observers moving past one another at any constant velocity would see time pass in the same way.Barnard’s star is an orange star in the constellation Ophiuchus. It has the largest known proper motion (10.3577"/yr) and the fourth-largest parallax angle (0.54901"). In the spectrum of this star, the H alpha line is observed to have a wavelength of 656.034 nm when measured from the ground. a. Determine the radial velocity of Barnard’s star. b. Determine the transverse velocity of Barnard’s star. c. Calculate the speed of Barnard’s star through space.
- v Correct Part C Which has a greater luminosity, a star with absolute magnitude -2 or a star with absolute magnitude 8 ? O A star with absolute magnitude 8. A star with absolute magnitude -2. Submit Previous Answers Correct Part D By how much? LM=-2 LM-8 000000001 Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Next > Provide Feedback P Pearson 8:58 PM (cp ツ 4/2/202 earson Education Inc. All rights reserved. | Terms of Use Privacy Policy Permissions Contact Us | 49°F SunnyFour research teams measured the rotation period of a newly detected neutron star, and what each team wrote in its team notebook is shown in the table below. Suppose a later and more reliable measurement gives 0.250 s for the period of the same star. Decide which of the earlier measurements was the most accurate, and which was the most precise. what was written most accurate most precise team in the notebook measurement measurement A "0.20s + 30.%" В "between 0.255s and 0.265s" "0.35s" D "0.300s + 0.025s"1. Use of the Einstein summation convention is a very efficient way to write a series of equations in a compact form. a) What are the two essential components of the convention, as applied with a 3 dimensional Cartesian frame of reference. Explain the Kroneker delta, ðj. b) Write the following 3 equations in compact form using the Einstein convention. XI= (a¡bı+a2bz+a3c3)yı + 5c1 X2= (a¡bı+a2bz+a3c3)y2 + 5c2 X3= (a¡bı+azbz+a;c:)y3 + 5c3 c) Expand the (Navier-Stokes for a constant density fluid) equation below into its component form for i = 1. du/ôt + uk ôu/ôxk = -(1/p)ôp/ôxi – gồi3 + (µ/p)ô²u;/(ôxmôxm)
- Solve the following problem: Two stars, named A and B, each with a mass equal to the Sun's mass are in orbit around each other. If the distance between the two stars is 1.0 AU. What is the period of their orbit? Describe each step in solving the problem:1. Consider our Sun - it is in orbit around the center of our Milky Way Galaxy. The velocity of the Sun in its orbit is about 250 km/s. The distance to the center of the galaxy is about 9.1 kpc (kiloparsecs). We can use Kepler's third law to calculate the mass of the galaxy interior to the Sun's orbit. We assume that the orbit is circular so that the semimajor axis is just the radius of the circular orbit = 9.1 kpc. First we need to calculate the number of AU's in 9.1 kpc. (Note that 1 Крс - 1000 рс - 3260 1t yrs and 1 pc - 206,265 AU.) %3D a =r =9.1kpc = (9.1kpc) 1000 pc 206,265AU] 1kpc AU Sun 1pcIn an intergalactic competition, spaceship pilots compete to see who can cover the distance between two asteroids in the shortest time. The judges are at rest with respect to the two asteroids. From the judges’ point of view, a pilot has covered the 3-millionkm course in 20 seconds. From the pilots’ point of view,A. The course is longer than 3 million km, the time longer than 20 seconds.B. The course is longer than 3 million km, the time shorter than 20 seconds.C. The course is shorter than 3 million km, the time longer than 20 seconds.D. The course is shorter than 3 million km, the time shorter than 20 seconds.