Did i do this question completely wrong? (Statics-moment)

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Homework Help Overview

The discussion revolves around a statics problem related to moments, specifically focusing on the conversion of units from millimeters to meters and its potential impact on the final answer. Participants are reflecting on their approaches to the problem as encountered in a final exam context.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss the implications of unit conversion on their calculations, particularly regarding forces and moments. There are inquiries about the correctness of their numerical values and whether the conversion from mm to m affects the final results.

Discussion Status

Some participants have acknowledged potential mistakes in their calculations due to unit conversions. There is a recognition that if the only error was in unit conversion, it may still warrant partial credit. However, there is no explicit consensus on the overall correctness of the approaches taken.

Contextual Notes

Participants are operating under the constraints of a final exam setting, which may influence their confidence in the accuracy of their answers. There is mention of specific numerical values and the need for consistency in units throughout the problem.

lc99
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Homework Statement


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Homework Equations

The Attempt at a Solution



I had this question on my final exam and i think i got the wrong numbers because i converted the mm into meters for all of them. So i kept F=3kN , 450N*m , and 3kN as is and used meters instead of mm for the lengths. Would this affect my final answer?
 

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lc99 said:

Homework Statement


View attachment 225356

Homework Equations

The Attempt at a Solution



I had this question on my final exam and i think i got the wrong numbers because i converted the mm into meters for all of them. So i kept F=3kN , 450N*m , and 3kN as is and used meters instead of mm for the lengths. Would this affect my final answer?
What was your final answer?
If that was your only mistake, you should get some worthwhile credit.
 
Changing mm to m is fine but if you use force in kN, then your 450 N-m couple should be converted to 0.450 kN-m. Did you do that?
 
haruspex said:
What was your final answer?
If that was your only mistake, you should get some worthwhile credit.
For normal force A , i got like -474 kN . So basically i got the wrong support forces and so i used the wrong numbers.
 
PhanthomJay said:
Changing mm to m is fine but if you use force in kN, then your 450 N-m couple should be converted to 0.450 kN-m. Did you do that?
Ahh man. I did not do that. Uhgh. No wonder nothing matched up.

I did all the steps that needed to be done like finding the equations for shear and bending moments. But it just did not match up with the actual problem. UGH
 

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