How Can I Use Calculus to Verify This Physics Equation?

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SUMMARY

The discussion centers on verifying the equation v(t) = sqrt(gm/cd)tanh((sqrt(gcd/m)t) as a solution to the differential equation dv/dt = g - (cd/m)v². Participants clarify that the task is not to derive the solution but to confirm its validity. The confusion arises from the distinction between verification and derivation, emphasizing the importance of understanding the solution space rather than solving the differential equation from scratch.

PREREQUISITES
  • Understanding of differential equations, specifically first-order equations.
  • Familiarity with calculus concepts such as derivatives and hyperbolic functions.
  • Knowledge of physics principles related to motion and forces, particularly gravitational force.
  • Basic proficiency in mathematical notation and manipulation.
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  • Study the verification process of solutions to differential equations.
  • Learn about hyperbolic functions and their applications in physics.
  • Explore the derivation of solutions for first-order differential equations.
  • Research the physical implications of the equation v(t) in the context of motion under gravity.
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Students of physics and mathematics, educators teaching calculus and differential equations, and anyone interested in the application of calculus in verifying physical equations.

strawberryy
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I'm supposed to use calculus to verify that v(t) = sqrt(gm/cd)tanh((sqrt(gcd/m)t)

is a solution to dv/dt=g-(cd/m)v2. I don't understand what was done to achieve the solution.
 
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While the derivation isn't hard, you aren't being asked to solve the differential equation as if you had no guess at the form of the solution space -- you are simply being asked to verify that that is a solution.
 
Agreed, what you list as a question is different than what you actually profess confusion in understanding.

The question wants you to verify v(t) is a solution. Did you misunderstand, or did you really wish to discuss how to obtain that solution?
 

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