# High School Physics Question!

I have the answer if you guys want it.

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Note that the wave is moving to the right. Hence, translate the whole curve slightly to the right to determine where point P will eventually be.

Yes, but doesn't each point on the wave maintain it's position in the positive x direction? It's only the y component of each point which changes. Anyone else have any idea?

Hootenanny
Staff Emeritus
Gold Member
kudos213 said:
Yes, but doesn't each point on the wave maintain it's position in the positive x direction? It's only the y component of each point which changes. Anyone else have any idea?

Yes, the point P oscillates only in the y direction, so as the wave moves to the right, will point P move up or down?

~H

negative y hat

Hootenanny
Staff Emeritus
Gold Member
kudos213 said:
negative y hat

Yes, I suggest we let the OP finish of the question.

~H

word...i'm still new here i.e. learning the ropes. how could we mathematically solved this question?

Hootenanny
Staff Emeritus
Gold Member
kudos213 said:
word...i'm still new here i.e. learning the ropes. how could we mathematically solved this question?

You couldn't, there is no data given (velocity/ displacement / time).

~H

DaveC426913
Gold Member
This question actually somewhat ambiguous, and as such the OP might get the wrong advice and answer.

Depending on how you interpret "point P", your answer will be different!
a] Point P is a physical point on the rope.
b] Point P is an imaginary point on the wave.

Pizzasky interpreted it as a], but others interpreted it as b].

I'm am 99.9% certain a] is correct. So, yes, follow Kudos and Hoot's guidance.

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Hootenanny
Staff Emeritus
Gold Member
DaveC426913 said:
This question actually somewhat ambiguous, and as such the OP might get the wrong advice and answer.

Depending on how you interpret "point P", your answer will be different!
a] Point P is a physical point on the rope.
b] Point P is an imaginary point on the wave.

Pizzasky interpreted it as a], but others interpreted it as b].

I'm am 99.9% certain a] is correct. So, yes, follow Kudos and Hoot's guidance.

The OP said they have the correct answer, it would be helpful if he/she could post it to clear the matter up. But I agree with Dave, it is an ambiguous question, I was assuming point P is a physical point on the wave.

~H

if the wave is going to the right, then shouldnt the answer be c?
......
maybe im missing something

Hootenanny
Staff Emeritus
Gold Member
skywolf said:
if the wave is going to the right, then shouldnt the answer be c?
......
maybe im missing something

That is what we were discussing, I'll refer you to posts #4,5,6,7

~H

The answer key gives choice C.

Anyone care to explain? Thank you all.

DaveC426913
Gold Member
OK. That clears up what they're asking. Point P is a physical point on the rope. Pretend it's a spot of paint.

Now, as the wave travels down the rope, how will that spot of paint move?

Think of this: the rope is tied off the right side to a lamppost. Your friend is off to the left, holding the rope, waving it up and down, creating the wave. (Note that the rope does not actually go anywhere - he can wave all he wants, but the rope will remain in our field of vision).

NOW what will the spot of paint do?

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