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In mechanics, stress is a measure of the internal forces acting within a deformable body. Quantitatively, it is a measure of the average force per unit area of a surface within the body on which internal forces act. These internal forces are produced between the particles in the body as a reaction to external forces applied on the body. In materials without microstructure (these are materials whose microstructure does not play an important role in the mechanical deformation), these internal forces are distributed continuously within the volume of the material body, and result in deformation of the body's shape. Beyond certain limits of material strength, this can lead to a permanent change of shape or physical failure. The dimension of stress is that of pressure, and therefore the SI unit for stress is the pascal (Pa). A three-dimensional stress eld in a material can be represented as a sym- metric matrix of the following form:
where the diagonal terms represent tensile or compressive stresses and the o-diagonal terms represent shear stresses.
Derive the Einstein Relation From the laws of thermodynamics, electrons carry a thermal energy equal to 1/2 kT per degree of freedom. Use this value to derive the Einstein's r
if 2.13*106J of work must be done on a roller_coaster car to move it 3.00*102m,how large is the net force acting on the car ?
THIN FILM TECHNOLOGIES The various thin technologies currently being developed reduce the amount of light a bsorbing material required in creating a solar cell. This
James Watt was the first inventor.
what is motion?
A machine performs 8 Joules of work in 2 seconds. How much power is delivered by this machine? Ans: The power is delivered by this machine is 4 watts.
consider a star orbitining in the sperically graviational potential Y=(Vc)2 ln(r/r0). a)use conservation of energy and angular momentum to obtain equation for dr/dt and d(teta)/dt
Q. Compute the mutual inductance between two coils when a current of 4 a changing to 8 a in 0.5 s in one coil induces an emf of 50 mV in the other coil. Induce emf e = -
Olbers' paradox (H. Olbers; 1826): If the Universe is uniform, infinite & unchanging then the whole sky at night would be bright regarding as bright as the Sun. The further yo
Write two characteristic features of nuclear force which differentiate it from the Coulomb force.
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