- #1

helpmeplease8

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## Homework Statement

A centripetal-acceleration addict rides in uniform circular motion with period T = 4 s and radius r = 3.00 m. At one instant his acceleration is a = (7.00 m/s2)i + (-3.00 m/s2)j . At that instant, what are the following values?

(a) v·a

(b) r x a

## Homework Equations

2∏r/T = speed

v^2/r = acceleration

(4*∏^2*r)/T^2 = acceleration

## The Attempt at a Solution

a) (32.97m^2/s^3)i + (-14.13m^2/s^3)j

b) (21m^2/s^2)

**i**+ (-9m^2/s^2)

**j**

Are these right?