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## Homework Statement

95] A particle P travels with a constant speed on a circle of radius r=3.00m and completes noe revolution in 20.0s.

**The particle passes through O at time t=0. State the following vectors in magnitude-angle notation**(angle relative to the positive direction of x). With respect to O, find the particle's position vector at the times t of

a) 5.00s

h] next, find the acceleration at the beginning and end of the interal from 5s to 10s.

## Homework Equations

T= (2r*pi)/v

S= theta/r

## The Attempt at a Solution

It's quite embarrassing that I am in university and having difficulties with such a simple problem, but it's been 8 months since I have worked on physics =[

Anyways, I know that velocity is not constant, but speed is; furthermore, the magnitude of the acceleration should also be constant.

Using this info, I found the velocity easily by using V=d/t, but am having trouble finding the angles. I used the distance that I got from that equation and subbed it into the S=r*theta equation, but I keep getting the wrong answer for a) (I got about 75degrees, the answer key gets 45degrees). I am not sure where I'm going wrong here...

There are other parts to the equation as well, but they are all similar and I can do them just fine if I can find the correct angles. Also, I am not sure how to find the angle on the acceleration at all, so any starting hints would be appreciated :)

Thanks again for your help for a terrible student =3

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