Home
Class 11
PHYSICS
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)]`.
Promotional Banner

Topper's Solved these Questions

  • UNITS AND MEASUREMENT

    MODERN PUBLICATION|Exercise REVISION EXERCISES (VERY SHORT ANSWER QUESTIONS)|49 Videos
  • UNITS AND MEASUREMENT

    MODERN PUBLICATION|Exercise REVISION EXERCISES (ADDITIONAL QUESTIONS)|4 Videos
  • UNITS AND MEASUREMENT

    MODERN PUBLICATION|Exercise NCERT FILE (EXEMPLAR PROBLEMS SUBJECTIVE QUESTIONS)|17 Videos
  • THERMAL PROPERTIES OF MATTER

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|15 Videos
  • WAVES

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|14 Videos

Similar Questions

Explore conceptually related problems

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

If the energy ( E) ,velocity (v) and force (F) be taken as fundamental quantities,then the dimension of mass will be

Time (T), velocity (3) and angular momentum (h) are chosen as fundamental quantities instead of mass, length and time. In terms of these, the dimensions of mass would be

If force, acceleration and time are taken as fundamental quantities, then the dimensions of length will be:

If density ( rho ) acceleration (a) and force ( F ) are taken as basic quantities then time period has dimensions

Time (T),Velocity (C) and angular momentum (h) are chosen as fundamental quantities instead of mass,length and time. In term of these,dimension of mass would be:

If force (F) , velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are