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avatar+369 

Regarding the cos function, with the pendulum. 

 

Why was the maximum 2.5? 

Julius  Nov 26, 2017
edited by Julius  Nov 26, 2017
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4+0 Answers

 #1
avatar+79894 
+1

Look at the image, here :

 

The rope hangs from the point (0,4)..the bottom of the rope is at (0,1).....it swings out at a 60 degree angle (pi/3) from a vertical position in each direction....so....it reaches a height of 2.5 m as shown

 

cool cool cool

CPhill  Nov 26, 2017
 #2
avatar+369 
+1

but how would you find that algebraically? 

Julius  Nov 26, 2017
 #3
avatar+79894 
+1

We can use this to find the height :

 

[1  +  3*sin (30°) ] m   =  [1  + 3 (1/2)] m   = [ 1 + 3/2 ] m   =   [1 + 1.5 ] m   =   2.5 m

 

 

cool cool cool

CPhill  Nov 26, 2017
 #4
avatar+91253 
0

Hi Julius and all others,

When you ask a question please include the whole question. 

 

I assume this question refers to an earlier thread - you should have asked your question with another post on the initial thread and then if you wanted to draw attention to it you could have made a new post just giving the link and saying that you have asked for more discussion/help.   laugh

Melody  Nov 27, 2017

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