How did Newton's Laws synthesize earlier observations and
How did Newton's Laws synthesize earlier observations and complete the Copernican revolution?
Explain how an object is put into orbit
Explain how an object is put into orbit about the Earth (to become a satellite). Include the relationship between gravity and velocity.
How is the temperature of a star measured?
General Information
What can be learned from stellar spectra besides temperature?
General Informaiton
How are meteors categorized? What are the two main categories, and what subdivisions exist within them?
Calculate the distance to 61 cygni in meters and parsecs.
7) Friederich Bessel suspected that the star 61 cygni, scarcely visible with the naked eye, might be one of our closest neighbors. He was able to measure the total angular shift of 61 cygni, arising from the earth’s orbital motion, as 0.628 arc seconds. Taking the average distance of the earth from the sun as 149.6 million km, c ...continues
Calculate the distance of this star.
8) Sirius is one of our nearest and brightest neighbors at a distance of 2065 pc. By a careful comparison of the spectral lines, a second star is known to have an intrinsic brightness, or luminosity, very similar to that of Sirius, even though it appears one hundred times fainter from earth. Calculate the distance of this star.
Work out its distance from earth, taking Hubble’s constant to be 71 km s -1 Mpc -1.
9) A galaxy has a red-shift measured as 0.21. Work out its distance from earth, taking Hubble’s constant to be 71 km s -1 Mpc -1.
10) The AMANDA neutrino telescope was mentioned in Reference below. The neutrinos it detects have passed through the earth and are rising through the ice sheet. There are an enormous number of neutrinos doing this every second. A tiny proportion of these interact with quarks within protons or neutrons in the ice to form muons. T ...continues
11) Suppose that one of the neutrinos (in Reference below) interacts with a down quark and the outcome is one muon plus one up quark. (i) Which of the four fundamental interactions is involved in this process? List the conservation laws that apply. (ii) Identify a quantum of energy which might facilitate the interaction. (iii) D ...continues
