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Mechanics Materials
Moment of a force about a point is defined as force x Hookes lawthe force (needed to stretch a
perpendicular distance from the point to the line of spring is directly) proportional to the
action of the force extension (of the spring from its natural
length) up to…

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Path differencethe difference in distances from two Equilibrium
coherent sources to an interference fringe
Coherencewave source has constant phase difference resultant force must be zero ! (or forces
Monochromatic lightsingle wavelength balance)
Laser source of coherent monochromatic light
two source and single source doubleslit systems for the resultant torque must…

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