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Consider an Ising model of just two elementary dipoles, whose mutual interaction energy is ±ε. Enumerate the states of this system and write down their Boltzmann factors. Calculate the partition function. Find the probabilities finding of the dipoles parallel and antiparallel , and plot these probabilities as a function of kT/ε. Also calculate and plot the average energy of the system. At what temperatures are you more likely to find both dipoles pointing up than to find one up and one down?
The centripetal acceleration of a rotating disk is 5.9 m/s2. The radius of the disk is 0.74 m. What is the angular velocity of the disk
Imagine for a moment that the moon is held in its orbit about the earth by electrical forces rather than by gravitation. What is the necessary electrical charge -Q that would be on the earth and +Q that would be on the moon to hold the moon in a circ..
This figure (|| = 10.5 m/s2) represents the total acceleration of a particle moving clockwise in a circle of radius r = 2.40 m at a certain instant of time. (a) For that instant, find the radial acceleration of the particle. m/s2 (toward the center) ..
Find an expression for the change in the system's potential energy in terms of the parameters shown in the figure. (Use any variable or symbol stated above along with the following as necessary: g. Do not substitute numerical values; use variables..
Consider one mole of neon gas at a temperature of 25°C. Assume neon behaves as an ideal, monatomic gas at this temperature. What is the average translational kinetic energy of a neon atom at this temperature? What is the total random translational ki..
A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 383 K. what is the mass of helium present
When two point charges are a distance R apart, their potential energy is -2.00 .How far (in terms of R) should they be from each other so that their potential energy is -6.00.
Consider two infinite parallel plane conducting plates, of finite thickness, with separation d. Suppose a charge density of σ is placed on one plate, while the other plate has -2σ. Determine the resulting charge densities on each of the 4 surfaces
A cyclotron is used for the acceleration of alpha particles. The radius of the cyclotron?s dee is 2 m, and the magnetic flux density in the dees is 0.8 T. What is the velocity of the alpha particles when they exit the cyclotron? The alpha particle..
an alpha particle charge 2e enters a uniform electric field e 5x104 vm m directed alongsay the y axis. the particle
A 39.0-kg child swings in a swing supported by two chains, each 3.10 m long, Find the force exerted by the seat on the child at the lowest point
A silicon solar cell looks like a battery with a 0.33Vterminal voltage. What is the solar cell's efficiency-that is, what percentage of the energy incident on the cell is converted to electric energy
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