Physics, 21.09.2019 19:20 ghari112345
The hamiltonian of a spin in a magnetic field is given by a(bbysy+b, s), where α and the three components of b are all constants. (a) compute the energies and corresponding eigenstates of this system (b) let by-0 and b = 0. (i) use the energies and eigenstates for this case to determine the time evolution ψ(t) of a state with initial condition ψ(0) (ii) calculate the expectation values 〈s) and (s) as a function of tine. (iii) use a taylor expansion to show that the time-evolution operator u(t) exp(-iht/h) can be written as (e)s()i - isin(ut)x, where i is the identity operator, x (2/h)s, and w ab/2. hint: use the pauli matrix representation of the spin operator and show that
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Physics, 21.06.2019 18:00
What happens to the velocity of the car when the upward pull of the cable is greater than the downward pull of gravity as the car rises toward the top?
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3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?
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Physics, 22.06.2019 23:40
Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.
Answers: 3
The hamiltonian of a spin in a magnetic field is given by a(bbysy+b, s), where α and the three compo...
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