The Gravitational Field

  • Thread starter adhiluhur
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  • #1
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Homework Statement


2uicc2f.jpg


Homework Equations


jt3x4l.jpg


The Attempt at a Solution


347xvnn.jpg


But as you can see, when I typed the answer on the answer column, the computer marked it as wrong. Please point out my mistake in 24 hours. Thank you.
 
Last edited:

Answers and Replies

  • #2
lewando
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What is the distance between M and O?
 
  • #3
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What is the distance between M and O?

By simple Pythagorean theorem you can work it out to l^2 sqrt{2}
 
  • #4
lewando
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By simple Pythagorean theorem you can work it out to l^2 sqrt{2}
I get something different. Since the clock is ticking, how about
[tex]l \sqrt{2}[/tex]
 
  • #5
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I get something different. Since the clock is ticking, how about
[tex]l \sqrt{2}[/tex]

I was writing the distance squared. So basically our answer for that is same.
 
  • #6
lewando
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Ahh.. nevermind me, I thought I saw it... standby please.
 
  • #7
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Ahh.. nevermind me, I thought I saw it... standby please.

I think my answer is correct and the computer is wrong.
 
  • #8
lewando
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How about your last step? The answer you gave was the common coefficient of i and j. But to get the magnitude should you not take the root of sum of the squares of these coefficients?
 
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  • #9
Use more sets of parentheses at the beginning.
 
  • #10
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How about your last step? The answer you gave was the common coefficient of i and j. But to get the magnitude should you not take the root of sum of the squares of these coefficients?

Enlighten me.
 
  • #11
Hootenanny
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Enlighten me.
What is the magnitude of the vector [itex]\boldsymbol{x} = \boldsymbol{i}+\boldsymbol{j} = [1,1]^\text{T}[/itex]?
 
  • #12
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When something is in the form Constant * ( i + j ) and you would like to find the magnitude of that

use abs ( Constant * ( i+j) ) = Abs(Constant ) * Abs(i+j)

what is Abs ( i + j ) ?

How would you interpret it ?
 

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