- #1

ComputerForests000

- 3

- 0

## Homework Statement

A disk is initially at rest. A penny is placed on it at a distance of 1.4 m from the rotation axis. At time t=0s, the disk begins to rotate with a constant angular acceleration of 1.9 rad/s^2 around a fixed, vertical axis through it's center and perpendicular to it's plane. Find the magnitude of the net acceleration of the coin at t=1.2 seconds.

## Homework Equations

tangential acceleration=α r

radial acceleration= r ω^2

ω = ω initial + α t

## The Attempt at a Solution

I found the tangential acceleration to be 2.66 m/s^2,

then used ω = ω initial + α t to find the angular velocity, 3.192 m/s,

then found the radial acceleration to be 14.2644 m/s^2,

then took the square root of (tangential acceleration)^2 +(radial acceleration)^2 , which came out to be:

**14.51 m/s^2**

Apparently this answer is incorrect.