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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?
You have a 3.5 m high platform that is level on top. A spring launcher is located on the top so that it launches objects horizontally. How far away from the launcher will it hit the ground
The work to required to strech a certain spring by an elongation of 4.00 cm to an elongation of 5.00cm is 30.5 J. (a)is the work required to increase the elongation of the spring from 5.00 cm to 6.00 cm greater than,less than or equal to30.5J?
Magnitude of force exerted by +1nC charge is 2 Newton. Compute the distance between the charges
A 5-lbm toy car is at the end of a spring compressed 2 inches. The linear spring has a force constant of k = 3 lbf/in. How much energy is stored in the compressed spring
If we assume that the wave spreads out evenly with no obstructions, what is the electric field strength at the base unit 100 feet from the phone
A hoop rolls without slipping down a ramp that is inclined at 35 degrees above the horizontal. Calculate the length of the ramp
A 4.8 toroidal inductor has 110 identical equally spaced coils. If it carries an 12.0 current, how much magnetic flux passes through each of its coils, at what rate is the current in it changing
You drop a stone into a deep well and hear it hit the bottom 6.26s later. How deep is the well
A 7.24 nC charge is located 1.93 m from a 4.10 nC point charge. Find the magnitude of the electrostatic force
Two wooden crates rest on top of one another. The smaller top crate has a mass of m1 = 16.0 kg and the larger bottom crate has a mass of m2 = 90.0 kg. what is the acceleration of the lower crate
The top plate is illuminated by monochromatic light of wavelength 544.1 nm. Determine number of dark parallel bands crossing the top plate (including the dark band at zero thickness along the edge of contact between the two plates).
A 5.00g bullet is fired horizontally into a 1.30kgwooden block resting on a horizontal surface. What was the initial speed of the bullet
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