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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.
A second baseman tosses the ball to first baseman, which catches it at the same level from which it was thrown. The throw is made with an initial speed of 15 m/s at an angle of 38.0^circ above the horizontal. What is the horizontal component of ba..
An airplane is flying through a thundercloud at a height of 2400 m. (Flying at this height is very dangerous because of updrafts, turbulence, and the possibility of electric discharge.)
Suppose you have a circuit consisting of a resistance R = 54 ?, an inductor with L = 36.4 mH and internal resistance r = 30 ?, What is the frequency of the damped oscillations of this circuit
The potential at location A is 376V. A positively charged particle is released there from rest and arrives at location B with a speed vB.
A passenger train is travelling at 31 m/s when the engineer sees a freight train 351 m ahead of his train travelling in the same direction on the same track. The freight train is moving at a speed of 5.6 m/s.
guess the force between a proton and an electron at the Bohr radius of 0.5Å (1 Å=10-10 m). The magnitude of the charge of an electron, as well as a proton, is 1.6·10-19 C.
The mass of a robot is 5220 kg. This robot weighs 2650 N more on planet A than it does on planet B. Both planets have the same radius of 2.26 × 107 m
Two joggers run at a constant velocity of 7.5 m/s toward the east. At time t=0, one is 15m east of the origin and te other is 15m west.
Atoms are typically spaced about 0.2 nm apart. At that spacing, how many atoms would be found in a line 4.93 inches long?
A 0.290-kg block along a horizontal track has a speed of 1.60 m/s, What is the spring's maximum compression if the track is frictionless
A student throws a set of keys vertically upward to her sister in a window 4.0 m above. The keys are caught 1.5 s later by the sister’s outstretched h&. Find initial speed were the keys thrown?
A satilite of mass 5500 kg orbits the Earth and has a period of 6600s. Dertermine the radius of its circular orbit and the altitude of the satelite
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