How do I differentiate m(L^2)/16?

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SUMMARY

The discussion centers on differentiating the moment of inertia expression I = m(L^2)/16 with respect to x. Participants clarify that if m and L are constants, they can be treated as such during differentiation. The correct differentiation process involves applying the product and chain rules, leading to the expression dI/dx = 2m1x - 2m2(L - x). The conversation emphasizes the importance of understanding basic differentiation rules, particularly when dealing with constants and variables.

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  • Understanding of basic calculus, specifically differentiation techniques.
  • Familiarity with the moment of inertia concept in physics.
  • Knowledge of the product rule and chain rule in calculus.
  • Ability to identify constants and variables in mathematical expressions.
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  • Review basic differentiation rules, including the product rule and chain rule.
  • Study the concept of moment of inertia in detail, focusing on its applications in physics.
  • Practice differentiating expressions involving constants and variables.
  • Explore examples of calculating moment of inertia for different mass distributions.
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Students studying physics or mathematics, particularly those focusing on mechanics and calculus, as well as educators seeking to clarify differentiation techniques in the context of physical applications.

  • #31
Yes! Since dL/dx = 0, what do you get for dI/dx?
dI/dx = d/dx(m1x2 - m2(L - x)2) = ?
 
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  • #32
so dI/dx=2m1+2m2(L-x)

?
 
  • #33
Now the second term is correct, but the first one isn't. You had it right before.

Since you're having so much trouble with differentiation, I would advise you to go back and review the basic differentiation rules, especially the product rule and chain rule, and derivative of a constant rule.
 
  • #34
ahh ye just missed the x from the first term
thanks for all the help btw =]
 

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