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An electron is confined to move in the xy plane in a rectangle whose dimensions are Lx and Ly. That is, the electron is trapped in a two-dimensional potential well having lengths of Lx and Ly. In this situation, the allowed energies of the electron depend on two quantum numbers nx and ny and are given by
A pitcher pitches a baseball of mass 0.20 kg. The baseball arrives at home plate with a speed of 40 m/s and is batted directly back to the pitcher (horizontally) with a return speed of 50 m/s. find the magnitude of the average force of the bat on ..
A piano tuner stretches a steel piano wire with a tension of 1040N . The wire is 0.400m long and has a mass of 3.90g. What is the frequency of its fundamental mode of vibration
The wave function for a wave on a taut string is y(x, t) = 0.335 sin(9?t ? 3?x + ?/4) where x and y are in meters and t is in seconds. What is the energy contained in each cycle of the wave
Suppose you are in a high-speed boat moving at 18.0 m/s directly into approaching 1.10 m wavelength wave. What is the time interval between wave peaks hitting the boat
Consider the decay: 24 Cr 55 -> 25 Mn55 + e, The Cr 55 nucleus has a mass of 54.9279 u, find the maximum kinetic energy of the emitted electrons
When a potential difference of 221 V is applied to two plates of a parallel-plate capacitor, the inner surface of the positive plate carries a surface charge density of 40 nC/cm2. What is the spacing between the plates
A 6,000 lb car is traveling SW at 40 mph. it is hit by another car that weighs 7,000 lb and is traveling NNE at 50 mph. What is the speed and direction of the cars immediately after the collision
On the moon the surface temperature ranges from 376 K during the day to 0.98 102 K at night. What are these temperatures on the Celsius scale
A light ray is incident from air onto the surface of a very quiet lake. what is the index of refraction of the water
The loaded cab of an elevator has a mass of 3.7 x 10^3 kg and moves 228 m up the shaft in 21 s at constant speed. At what average rate does the force from the cable do work on the cab.
Where must an object be placed to form an image 28.8 cm from a diverging lens with a focal length of 45.0 cm, Determine the magnification of the image
Two carts with masses of 4.80 kg and 2.78 kg move toward each other on a frictionless track with speeds of 4.94m/s and 3.17m/s respectively. The carts stick together after colliding head-on. Find out the final speed.
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