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Consider two clouds in the interstellar medium. A molecular (H2) cloud has T = 10 K and n = 1012 m-3; a neutral atomic (H) cloud has T = 120 K and n = 107 m-3.
(a) What is the Jeans mass for each of the two clouds?
(b) What is the minimum radius each cloud must have to collapse?
(c) What is the timescale for the gravitational collapse of each cloud?
In a laboratory, light from a particular spectrum line of helium passes through a diffraction grating and the second-order maximum is at 18.9 degrees from the center of the central bright fringe. What is the angular location of the second-order max..
A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.11 m2 and whose thickness is 3 mm. what is the percentage lost by the window
A bicycle wheel is rotating at 49 when the cyclist begins to pedal harder, giving the wheel a constant angular acceleration of 0.42. How many revolutions does the wheel make during this time
You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. What is the height of the arrow above the ground once it has travelled the 43.0 m horizontally
A 1.50 103-kg car starts from rest and accelerates uniformly to 15.8 m/s in 13.0 s. Assume that air resistance remains constant at 400 N during this time. Find the average power developed by the engine
An ice cube is floating at the top of a glass of water. After it melts completely, will the water level rise, fall, or stay the same? Explain your answer.
Consider a uniformly volume-charged sphere of radius R and charge Q What is the electric potential on the surface of the sphere in terms of R, Q, and 0, choosing the zero reference point for the potential at the center of the sphere.
Calculate your apparent weight at the top and bottom of a Ferris wheel, given that the radius of the wheel is R meters, it completes one revolution every T seconds
A charge Q is uniformly distributed throughout a nonconducting sphere of Radius R. What is the magnitude of the electric field at a distance of R/2 from the center of the sphere? What is the magnitude of the electric field at a distance of 2R from th..
A 6.6-kg rock and a 4.7 × 10-4-kg pebble are held near the surface of the earth. Determine the magnitude of the gravitational force exerted on each by the earth
when you blow up a balloon do you slightly warm the balloon? when air is allowed to rush out of it how if at all does
A golfer, putting on a green, requires three strokes to "hole the ball." During the first putt, the ball rolls 4.0 m due east. For the second putt, the ball travels 3.1 m at an angle 20° north of east. The third putt is 0.50 m due north. What disp..
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