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a metal piece of mass 10grm is suspended by a vertical string.the spring elongates 10cm over its natural length to keep the piece in equillibrium. a beaker containing water is now placed below the piece so as to immerse the piece completely in water. find the elongation of the spring. density of metal =9000kg/m3.
volume of metal=10/9 cc
buoyant force on metal=(10/9)*1
for spring, F=kx,
tensile force on spring =gravity- buoyant force
=10(1-(1/9))*g=kx2
10*g=kx2, x2=10cm
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