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1. Assume the average density of the universe is 0.1 of the critical density needed for closure. What is the average number of protons per cubic meter, assuming the universe is composed mostly of hydrogen?
2. To get an idea of how empty deep space is on the average, perform the following calculations:Find the volume our Sun would occupy if it had an average density equal to the critical density of 10-26 kg / m3 thought necessary to halt the expansion of the universe.
(b) Find the radius of a sphere of this volume in light years.
(c) What would this radius be if the density were that of luminous matter, which is approximately 5% that of the critical density?
(d) Compare the radius found in part (c) with the 4-ly average separation of stars in the arms of the Milky Way
Consider a conical pendulum with a 86.0 kg bob on a 10.0 m wire making an angle of ? = 7.00° with the vertical. What is the radial acceleration of the bob
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A positive charge Q = 6400.00 C is uniformly distributed over the volume of a sphere of radius R =1.50 m. Assume a spherical cavity of radius R/2 is cut out of the solid sphere, the center of the cavity being a distance R/2 from the center of the ori..
When an electric circuit is being assembled, a common practice is to twist together two wires carrying equal currents in opposite direction
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A space probe is launched from Earth, headed for deep space. At a distance of 10,000 miles from Earth's center, the gravitational force on the space probe is 520 pounds. If the gravitational force acting on the probe is proportional to 1/d2, what ..
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