A particle moves along the x-axis in the positive direction with energy E. It encounters a barrier with potential V > E at x = 0 and extending to x = L. Is there any chance for the particle make it to the other side?
a.
The wave functions for a finite square-well potential allow a small probability for the particle to be in the classically forbidden region where the energy of the particle is not greater than the potential barrier, which is what would be necessary if the particle were to stay in classically defined regions.
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A miracle car with a 100% efficient engine burns fuel having a 40-megajoules-per-liter energy content. If air drag and overall frictional forces at highway speeds totals 1000 N, what distance per liter can be achieved on the highway?
A) 30 km B) 40 km C) 50 km D) more than 50 km E) need more information
At an instant when a particle of mass 50 g has an acceleration of 80 m/s2 in the positive x direction, a 75-g particle has an acceleration of 40 m/s2 in the positive y direction. What is the magnitude of the acceleration of the center of mass of this two-particle system at this instant?
A. 60 m/s2 B. 56 m/s2 C. 40 m/s2 D. 50 m/s2 E. 46 m/s2
The key to finding quasars' distances was
A) planetary nebula in M51. B) globular clusters in the halo of M87 in Virgo. C) a Type I supernova in the spiral arm of 3C87. D) the luminosity of 3C52 from the Doppler shift and the Fisher-Tully relation. E) the huge redshifts of the hydrogen lines in 3C273.
If the current density in a wire or radius R is given by J = kr, 0 < r < R, what is the current in the wire?
A) 2?kR3/3 B) 3?kR3/2 C) kR3/3 D) kR2 E) kR2/2