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Helium forms a solid at low temperatures and high pressures. To maintain the order present in a solid, each atom must remain at its assigned position. Suppose that this restricts the uncertainty in the position to 0.19 nm.
(a) Find the uncertainty in momentum of the helium atom. Use deltax * deltapx >= h/2 for the uncertainty principle.
(b) Find the uncertainty in the kinetic energy of the helium atom. At low pressures, the bonds between helium atoms are not very strong. They cannot hold together atoms with this amount of kinetic energy. The zero point motion produced by the connement of the helium atom is great enough to break the bonds. For this reason helium does not form a solid at low pressures, even at absolute zero temperature. Helium forms a solid only if high pressure on its surface assists the bonds in holding together the atoms.
In a carnival they often have a large r = 16 m, cylinder which people stand against the outer wall while it rotates with some velocity, What is the minimum velocity of the cylinder to make someone "stick" to the wall in m/s
You walk 100 m to the north, and then you turn 70degrees to your right and then walk another 50 m. What is the magnitude of your total displacement
how high above the target must the rifle barrel be pointed.
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A sphere that is a perfect blackbody radiator has a radius of 0.140 m and is at 250°C in a room where the temperature is 27°C. find the net rate at which the sphere radiates energy.
While the dried up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 2.4 m/s at an angle of 60° above the horizontal.
Two equal volumes designated 1 and 2, each of which contains a quantity of a classical monatomic gas at the same temperature, establish a relationship between the chemical potentials µ1 and µ2
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