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Physics
consider 5 independent magnetic moments. each moment has only two directions +m and -m . hamiltonian of such system is given by x = mi . if the total magnetization of the system is equal to m , the entropy is equal to
Physics
A copper wire of length 3m is subjected to a force of 5N. Calculate the elongation produced if the young’s modulus of copper is 12X1010 N/m2, if the area of cross-section of the wire is 0.785X10-6m
Physics
Find the (a) amplitude, (b) angular frequency, (c) frequency, (d) wavelength, (e) period, (f) speed of the wave, and the (g) transverse displacement at x = 0.5m and t = 2s on the following wave functions:
1.) y(x,t) = (2.5m)sin[(20 rad/m)x + (180 rad/s)t]
2.) y(x,t) = (0.35m)cos[910 rad/m)x - (120 rad/s)t]
3.) y(x,t) = (0.6m)sin[(30 rad/m)x + (90 rad/s)t]
1.) y(x,t) = (2.5m)sin[(20 rad/m)x + (180 rad/s)t]
2.) y(x,t) = (0.35m)cos[910 rad/m)x - (120 rad/s)t]
3.) y(x,t) = (0.6m)sin[(30 rad/m)x + (90 rad/s)t]
Physics
A vertical spring has a force constant of 125N/m. By how much will the spring be compressed if a mass of 0.525kg placed on top of it?
Physics
A physics teacher sits on a rotating stool to demonstrate the conversion of angular motion. with her arms stretched, she rotates at 0.75 rev/s. When teacher's arms are tucked in close in her chest, she rotates at 1.50 rev/s. What is the ratio of her moment of inertia with outstretched arms to the moment of inertia with arms tucked in to her chest?
Physics
A motor exerts torque on a carousel for it to attain a speed of 2.5 rev/s starting from rest in 3.5s. Find the work done by the motor if the carousel has a radius of 27m and mass of 1.75 x 10^5 kg. Consider the carousel to be a thin-walled cylinder rotating about its center.
Physics
A yo-yo is a solid cylindrical-shaped object wrapped by a string. if the yo-yo has a mass of 0.020kg and a radius of 10cm, find its speed when the string is unwound, moving downward at a distance of 1.0m. The unwinding of the string took place without slipping.
Physics
What is the rotational kinetic energy of a 1.20-kg sphere with a radius of 0.250m rotating about its axis and an angular speed of 0.38 rad/s?
Physics
What angle did the tire rotate after 1 second if a spot of paint on the tire moves in a circular path with radius 0.43m while the tire move at 1.48m/s?
Physics
It takes 365.25 days for the earth to complete one revolution around the sun. Calculate the:
a.) period
b.) frequency
c.) angular frequency of the earth as it revolves around the sun
a.) period
b.) frequency
c.) angular frequency of the earth as it revolves around the sun
