# Uniform circular motion merry-go-round

## Homework Statement

A purse at radius 1.90 m and a wallet at radius 2.60 m travel in uniform circular motion on the floor of a merry-go-round as the ride turns. They are on the same radial line. At one instant, the acceleration of the purse is (1.70 m/s2) + (4.60 m/s2). At that instant and in unit-vector notation, what is the acceleration of the wallet?

## Homework Equations

Tan(theta)= -(V^2/r)sin(theta)/-(V^2/r)Cos(theta)
A=V^2/r
T(period)=2pir/v

## The Attempt at a Solution

I used the original components of the purse to determine the angle created from the acceleration components
1) Tan(theta)= (4.6m/s^2)/(1.70m/s^2)
Arc Tangent (4.6/1.7)=theta and I found theta=69.72 degrees

next, I used the angle to determine the new components of the wallet using the same velocity but at a different radius (2.6m)

2) 2.6 Cos69.72= acceleration of wallet about x = .901m/s^2
2.6 sin69.72 = acceleration of wallet about y = 2.44m/s^2

-I put those components into the unite vector notation and got the problem wrong... I'm wondering why, if anyone could please help. thanks

## The Attempt at a Solution

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kuruman
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## Homework Statement

A purse at radius 1.90 m and a wallet at radius 2.60 m travel in uniform circular motion on the floor of a merry-go-round as the ride turns. They are on the same radial line. At one instant, the acceleration of the purse is (1.70 m/s2) + (4.60 m/s2). At that instant and in unit-vector notation, what is the acceleration of the wallet?
Are there unit vectors multiplying these components? If so, what are they?

the only unit vectors that had been provided were the acceleration of the purse is (1.70 m/s2)i + (4.60 m/s2)j *apparently those letters didn't show up in the earlier post.

kuruman