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NEET-XII-Physics

P1 year:2019

with Solutions -
Qstn# 16 Prvs-QstnNext-Qstn
  • #16
    A body weighs 200 N on the surface of the
    earth. How much will it weigh half way down
    to the centre of the earth ?
    (1) 150 N
    (2) 200 N
    (3) 250 N
    (4) 100 N
    digAnsr:   4
    Ans : ( 4 )
    Sol.
    d
    g'
    R
    C
    g
    Acceleration due to gravity at a depth d from
    surface of earth
     ' =  
     
    d
    g g 1 ...(1)
    R
    Where g = acceleration due to gravity at
    earth's surface
    Multiplying by mass 'm' on both sides of (1)5
     ' =  
     
    d
    mg mg 1
    R
     = 
     
    R
    d
    2
     =  = = 
     
    R 200
    200 1 100N
    2R 2