Answered: 2. 60 million years ago, an asteroid… | bartleby

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2. 60 million years ago, an asteroid hit the Earth and killed every T-Rex on Earth. That
same day, a star was born.
45 years ago, the singer of the band T Rex, Marc Bolan, wrapped himself around a tree
at high speed. That same day, the star born 60 million years ago left the main
sequence. Estimate the mass of that star, stating all assumptions you make.

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The search for black holes involves searching for a. single stars that emit large numbers of X rays. b. X ray binaries where the compact companion has a mass in excess of 3 M. c. large spherical regions from which no light is detected. d. pulsars with periods less than one millisecond. e. pulsars that are orbited by planets.
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 0.23s
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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.
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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. 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"
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