Trig help

[GMCBoii]

A 6m ladder is leaning against a wall and begins to slide. The foot of the ladder slides outward at a rate of 0.2m/s. At what rate is the angle between the ladder and the wall changing when the top is 3m from the ground?

Which one do I use to solve x=3tanθ or x=6sinθ and why?

 

[lev888]

Which one do I use to solve x=3tanθ or x=6sinθ and why?

Where do these expressions come from?

 

[Deleted member 4993]

A 6m ladder is leaning against a wall and begins to slide. The foot of the ladder slides outward at a rate of 0.2m/s. At what rate is the angle between the ladder and the wall changing when the top is 3m from the ground?

Which one do I use to solve x=3tanθ or x=6sinθ and why?

Did you draw a figure for the problem?

What is Θ?

 

[Steven G]

Please understand that this forum does not solve any problems for students. Rather on this forum we expect the student to solve their own problems--with our help.

So please read the forum's guidelines, follow them and then post back. Then you will really receive the professional help which you need.

 

[Probability]

Did you draw a figure for the problem?

What is Θ?

I think the OP is referring to theta but I don't know the latex code for it!

 

[topsquark]

I think the OP is referring to theta but I don't know the latex code for it!

For lower case letters
\theta gives [math]\theta[/math]
For capital letters
\Theta gives [math]\Theta[/math]
-Dan

 

[Deleted member 4993]

For lower case letters
\theta gives [math]\theta[/math]
For capital letters
\Theta gives [math]\Theta[/math]
-Dan

And in PC_Keyboard <ALT>233 (on Num pad) gives you Θ.

 

[GMCBoii]

Where do these expressions come from?

 

[GMCBoii]

Did you draw a figure for the problem?

What is Θ?

 

[Dr.Peterson]

A 6m ladder is leaning against a wall and begins to slide. The foot of the ladder slides outward at a rate of 0.2m/s. At what rate is the angle between the ladder and the wall changing when the top is 3m from the ground?

Which one do I use to solve x=3tanθ or x=6sinθ and why?

Your drawing looks good. Now, in choosing the equation to differentiate, you want one that is true throughout the motion, not just at the moment asked about, so that differentiating it makes sense. Which number, 3 or 6, is a true constant in the problem?

 

[GMCBoii]

Your drawing looks good. Now, in choosing the equation to differentiate, you want one that is true throughout the motion, not just at the moment asked about, so that differentiating it makes sense. Which number, 3 or 6, is a true constant in the problem?

6m of the ladder is the constant so its x=6sintheta that I use then?

 

[Dr.Peterson]

Yes. At a later stage you'll use the 3.

 

[GMCBoii]

Yes. At a later stage you'll use the 3.

This is what I did so far. Where at a later stage would I use 3?

 

[Dr.Peterson]

This is what I did so far. Where at a later stage would I use 3?

You used 3 to find the 30 degree angle, which you used as the value of theta after differentiating.

 

[GMCBoii]

You used 3 to find the 30 degree angle, which you used as the value of theta after differentiating.

Thank you ❤