What Is the Second Derivative for Phi in Particle Kinematics?

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Discussion Overview

The discussion revolves around the calculation of the second derivative of phi in the context of particle kinematics, specifically related to a homework problem involving 3D motion. Participants are attempting to clarify the steps needed to arrive at the correct answer.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant presents a range of possible answers for the second derivative of phi, indicating uncertainty in their calculations.
  • Several participants request to see the calculations to identify potential mistakes, suggesting that a simple error might be present.
  • There is a specific mention that the first derivative goes to zero, but the second derivative remains unclear, which is causing confusion for the participant seeking help.
  • Another participant emphasizes the importance of providing work to receive assistance, reiterating the rules of the homework forum.

Areas of Agreement / Disagreement

Participants generally agree that the second derivative of phi is the focal point of confusion, but there is no consensus on the correct value or approach to finding it. The discussion remains unresolved as participants await further details from the original poster.

Contextual Notes

Limitations include the lack of specific calculations provided by the original poster, which hinders the ability of others to assist effectively. There is also an assumption that "2nd div" refers to the second derivative, but this is not explicitly confirmed.

bm71
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Homework Statement


L=18ft , theta-dot=8rpm or .83776 rad/s, omega = 1 rad/s, fi-0=70.5 and fi-1=24

Homework Equations

- 3D motion[/B]

The Attempt at a Solution


I have come up with a ton of different answet inbetween 12-18 ft/s^2. Non have been correct[/B]
 

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Why don't you show us some of your calculations? There may be a simple mistake located in there somewhere.
 
SteamKing said:
Why don't you show us some of your calculations? There may be a simple mistake located in there somewhere.
I can upload them later but don't have my notes on me right now.
 
SteamKing said:
Why don't you show us some of your calculations? There may be a simple mistake located in there somewhere.
I am stuck on what the 2nd div is for phi. The first goes to zero but the second I am not sure. That is the one that is messing me up in the equation.
 
bm71 said:
I am stuck on what the 2nd div is for phi. The first goes to zero but the second I am not sure. That is the one that is messing me up in the equation.
We can't help you unless you show us what you've done.

I mean, I'm guessing that "2nd div" stands for second derivative.

If you truly want help, then provide us with your work. Those are the rules in the HW Forums.
 

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