What are the results of integrating the dot and cross products of two vectors?

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Homework Help Overview

The discussion revolves around evaluating integrals involving the dot and cross products of two vector functions, A(t) and B(t), defined in terms of the variable t. Participants are exploring the integration of these vector operations over a specified interval.

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Approaches and Questions Raised

  • Participants are attempting to evaluate the integrals of the dot product and cross product of the vectors A(t) and B(t). Some are sharing their calculations and results, while others express uncertainty and seek clarification on the problem-solving process.

Discussion Status

There are various attempts to compute the integrals, with some participants providing their results for the dot and cross products. However, there is no explicit consensus on the correct approach or final results, and some participants are still questioning their understanding of the problem.

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Some participants have noted the need to show their work before receiving help, and moderators have emphasized the importance of posting in the appropriate forum for homework-related queries.

yusukered07
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If A(t) = t i - t2 j + (t - 1) k and B(t) = 2t2 i + 6t k, evaluate (a) [tex]\int^{2}_{0}A \cdot Bdt ,[/tex] (b) [tex]\int^{2}_{0}A \times B dt.[/tex]
 
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I have no idea!

Can you help me out, by SHOWING WHAT YOU HAVE DONE SO FAR?
 
yusukered07 said:
1. If A (t) = t i - t2j + (t -1) k, evaluate (b) [tex]\int^{2}_{0} A[/tex]
Integral of t = t2/2 = 2
Integral of t2 = t3/3 = 8/3
Integral of (t-1)=t2/2 - t = 0

Net result 2i -(8/3)j
 
mathman said:
Integral of t = t2/2 = 2
Integral of t2 = t3/3 = 8/3
Integral of (t-1)=t2/2 - t = 0

Net result 2i -(8/3)j

Sorry for giving a wrong problem...
 
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yusukered07 said:
If A(t) = t i - t2 j + (t - 1) k and B(t) = 2t2 i + 6t k, evaluate (a) [tex]\int^{2}_{0}A \cdot Bdt ,[/tex] (b) [tex]\int^{2}_{0}A \times B dt.[/tex]

You need to show an attempt at solving the problem before receiving help!

Start by evaluating A·B and AxB.
 
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Redbelly98 said:
Moderator's note: thread moved from "Calculus & Analysis"

Homework assignments or any textbook style exercises are to be posted in the appropriate forum in our https://www.physicsforums.com/forumdisplay.php?f=152" area. This should be done whether the problem is part of one's assigned coursework or just independent study.


You need to show an attempt at solving the problem before receiving help!

Start by evaluating A·B and AxB.


Yeah... That's the process I've made... Then I integrate them with respect to t and evaluate from 0 to 2
 
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For the dot product of A and B, I obtained 2*t3+6*t2-6*t. Then integrate that from 0 to 2.

For the cross product, I obtained -6*t3i+(2*t3-8*t2)j+2*t4k.
 

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