You are Here: Home

# Sequences Q (C2)

Announcements Posted on
AQA GCSE physics P1 unofficial mark scheme 05-05-2016

"k in terms of t".

I believe this would mean it only wants k in terms of t, not any other constant.
So how will i do it?
I have never done such questions.
2. (Original post by raheem94)
So how will i do it?
I have never done such questions.
Neither have I. It's about using what you know.

The cos graph has a period of 360. This is affected by the scale factor in the variable t, given by the constant k.

Hence kt= 360

-> k= 360/t

For the second bit:

You know that the constant k specifies the number of oscillations in a unit time interval-> clearly for one second it would be k/360.
Neither have I. It's about using what you know.

The cos graph has a period of 360. This is affected by the scale factor in the variable t, given by the constant k.

Hence kt= 360

-> k= 360/t

For the second bit:

You know that the constant k specifies the number of oscillations in a unit time interval-> clearly for one second it would be k/360.
Thanks .

The equation given in the question is, y=asin(kt+c).

I know sin also has a period of 360 but why both you and the OP are talking about cos having a period of 360 rather than sin.
4. (Original post by raheem94)
Thanks .

The equation given in the question is, y=asin(kt+c).

I know sin also has a period of 360 but why both you and the OP are talking about cos having a period of 360 rather than sin.
Well it hardly matters; sin and cos have the same periodicity.

For some reason I had 'y=acos(kt+c)' written down. Hmm..
Well it hardly matters; sin and cos have the same periodicity.

For some reason I had 'y=acos(kt+c)' written down. Hmm..
No problem.

The reason i got confused was that both you and OP were talking about cos rather than sin.

I understand it now, thanks for your help.

I was looking at the question from a different angle, hence i was struggling with it.
6. (Original post by raheem94)
Thanks .

The equation given in the question is, y=asin(kt+c).

I know sin also has a period of 360 but why both you and the OP are talking about cos having a period of 360 rather than sin.
Sorry that was just an error, I must have had cos on the brain. Thanks to f1mad for clearing this up, I was having trouble explaining.
7. (Original post by vinvinvin)
Sorry that was just an error, I must have had cos on the brain. Thanks to f1mad for clearing this up, I was having trouble explaining.
No problem.
8. (Original post by vinvinvin)
Sorry that was just an error, I must have had cos on the brain. Thanks to f1mad for clearing this up, I was having trouble explaining.
I get it now, thanks for your help.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: April 2, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### AQA physics unit 1

Check the unofficial mark scheme

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams