# Rotation of a Rigid Object About a Fixed Axis

## Homework Statement

A small object with mass 4.00kg moves counterclockwise with constant speed 4.50m/s in a circle of radius 3.00m centered at the origin. It starts at the point with position vector (3.00i+0j)m. Then it undergoes an angular displacement of 9.00rad. (a.) What it is position vector? Use unit-vector notation for all vector answers. (b.) In what quadrant is the particle located, and what angle does its position vector make with the positive x axis? (c.)What is its velocity? (d.)In what direction is it moving? Make a sketch of its position, velocity, and acceleration vectors. (e.) What is its acceleration? (f.) What total force is exerted on the object?

m=4.00kg
V=4.50m/s
r=3.00m

This is just a scary problem!

## Homework Equations

I was told to break it down into the x and y components, but how do you know to do that?
V=x/t
To find the direction it is moving, we would use the right hand rule, right?
a=V/t
ƩF=ma

## The Attempt at a Solution

I need to break it into x and y components, but I am lost on how to do that.