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If the velocity (V) , acceleration (A) ,...

If the velocity `(V)` , acceleration `(A)` , and force `(F)` are taken as fundamental quantities instead of mass `(M)` , length `(L) , and time (T)` , the dimensions of young's modulus `(Y)` would be

Text Solution

Verified by Experts

Let Young.s modulus is expressed as follows :
` Y propto V^(a)A^(b)F^(c )`
`[ML^(-1)T^(-2)]=[LT^(-1)]^(a)[LT^(-2)]^(b)[MLT^(-2)]^(c )`
`[ML^(-1)T^(-2)]= [M^(c )L^(a+b+c)T^(-a-2b-2c)]`
Comparing dimensions on both the sides we get the following :
`c= 1" ""............."(i)`
`a+b+c= -1`
`implies a+b+1= -1`
`implies a+b= -2" "".........."(ii)`
`-a -2b-2c= -2`
`implies -a-2b-2= -2`
`implies a+2b=0" ""..........."(iii)`
Subtracting equation (ii) from equation (iii) we get
`b=2" ""..........."(iv)`
Substituting equation (iv) in equation (ii) we get
`a = -4" ""............"(v)`
Using values of a,b and c we can write the dimensional formula for Young.s modulus as follws :
`[Y]= [V^(-4)A^(2)F^(1)]`.
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Knowledge Check

  • If velocity (v), acceleration (a) and force (F) are taken as fundamental quantities, the dimensions of Young's modulus (Y) would be

    A
    `[Fa^(2)v^(-2)]`
    B
    `[Fa^(2)v^(-3)]`
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    D
    `[Fa^(2)v^(-5)]`
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    A
    `FTV `
    B
    `F^(-1)TV `
    C
    `FTV^(-1)`
    D
    `FT^(-1)V`
  • If the energy ( E) ,velocity (v) and force (F) be taken as fundamental quantities,then the dimension of mass will be

    A
    `[Fv^(-2)]`
    B
    `[Fv^(-1)]`
    C
    `[Ev^(-2)]`
    D
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