Tension in Strings HELP thanks-very simple.

[_Mayday_]

PhysicsB, though this may seem unrelated to this thread, what book are you working from? I know what course you are taking (The same one as myself) but what book are you working from?

 

[physicsbhelp]

THANK YOU

ooo okay so let's see. (btw nice smiley face haha)

okay so mg=156.96
so 1.491F=156.96
so F= 105.2963827Newtons?

is that the correct answer?! THANK YOU

 

[physicsbhelp]

PhysicsB, though this may seem unrelated to this thread, what book are you working from? I know what course you are taking (The same one as myself) but what book are you working from?

i am not using a book. my physics teacher believes that we should not use books becuase it hinders your learning of physics. so he gives us random questions.

 

[_Mayday_]

Yes but do you use a book in class to learn from or to use as a reference?

 

[physicsbhelp]

No, that is what i just said. our teacher did not tell us to buy a book. we do not use any book. he just gives us notes on equations and then we get problems that he sends us through webassign or something

 

[physicsbhelp]

so i hope you got my answer Doc Al, is it right?

 

[Doc Al]

okay so mg=156.96
so 1.491F=156.96
so F= 105.2963827Newtons?

Looks good! (Round off your final answer to some reasonable number of significant figures.)

i am not using a book. my physics teacher believes that we should not use books becuase it hinders your learning of physics. so he gives us random questions.

You've got to be kidding!

 

[_Mayday_]

I would say buying a book does the opposite, it does not hinder your progress it guides you in the right direction. These questions on vectors are not easy a first but with the help of a book you can work through some excercises and make sure you are doing the correct thing.

 

[physicsbhelp]

OMG OMGOMGOMGOMGOMGOMGOMGOMG thank you soooo much DOC AL YOU
ARE THE BEST OF THE BEST!
!
!
!
!

 

[_Mayday_]

You've got to be kidding!

Exactly what I thought, it's insane! You need something to reference all your work or to use as a base for all your knowledge...

 

[_Mayday_]

The real question is do you understand it and would you be able to do a similar one again with no help?

 

[physicsbhelp]

and yah , that is why i need so much help on these questions because we don't have books! haha

okay so for part b the answer would be 1.72089Hz

 

[physicsbhelp]

probably not, i need a suggestion for ONE good BOOK for PHysics that is not too expensive.

 

[physicsbhelp]

nvm that part b answer is wrong. i don't get it. wouldn't harmonic=3

 

[_Mayday_]

I would talk to your teacher about it and say that you are looking for a book to help provide a base for your work. If you have solved the whole question mark the thread as solved.

Thread tools > Mark thread as solved

 

[physicsbhelp]

and wouldn't the wavelenth be 3.33333 becuase L= x*wavelength /2 and L=10 and x=3 so wavelength equal 3.3333333
or do i solve for frequency through finding the velocity which is the square root of Tension/Density

 

[physicsbhelp]

i know how to mark the thread as solved, however we have not finished the problem, there is a part b) it is on the first page of this thread.

 

[physicsbhelp]

right?

 

[physicsbhelp]

mayday or doc al can you help with part b)

 

[Doc Al]

The standing wave pattern on the string segment (whose length is 2m) contains how many wavelengths? Use that to figure out the wavelength.

 

[physicsbhelp]

do you mean i use the equation: (m*wavelength)/d = x/L

 

[physicsbhelp]

right?

 

[Astronuc]

Please refer to these for wave velocity and harmonics

http://hyperphysics.phy-astr.gsu.edu/hbase/waves/string.html#c2

http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/sound/u11l4d.html

 

[physicsbhelp]

At what frequency must the string between the pulleys vibrate in order to form the standing-wave pattern shown in Figure b)?


okay astronuc according to your first website this is my answer, is this right? .5736Hz

 

[physicsbhelp]

is this right?

 

[physicsbhelp]

Please Please Please Help! Any Help W/ Part B) Would Be Greatly Appreciated.

 

[Doc Al]

Please look at the links that Astronuc provided. (The second link is the same site I've been linking to.) Both of them will make excellent references for you.

Note that one wavelength = two "loops" (or two anti-nodes). In your problem, you see three loops. If 2 loops equal 1 wavelength, but 3 loops equal 2 m--what must be the wavelength? Set up a ratio and solve for the wavelength.