Radial and tangential acceleration

[steph35]

Homework Statement

A point on a rotating turntable 21.5 cm from the center accelerates from rest to a final speed of 0.800 m/s in 1.75 s. At t = 1.28 s, find the magnitude and direction of each of the following.

Homework Equations

(a) the radial acceleration

(b) the tangential acceleration

(c) the total acceleration of the point
? m/s^2, ? °

The Attempt at a Solution

for this i used the right equations for the give times and substituded V= 2pir/T but i didnt get the right answer. i used a_r= -v^2/r and a_t= d|v|/dt...can somebody explain it in a simple way...

 

[alphysicist]

Hi steph35,

Homework Statement

A point on a rotating turntable 21.5 cm from the center accelerates from rest to a final speed of 0.800 m/s in 1.75 s. At t = 1.28 s, find the magnitude and direction of each of the following.

Homework Equations

(a) the radial acceleration

(b) the tangential acceleration

(c) the total acceleration of the point
? m/s^2, ? °

The Attempt at a Solution

for this i used the right equations for the give times and substituded V= 2pir/T but i didnt get the right answer. i used a_r= -v^2/r and a_t= d|v|/dt...can somebody explain it in a simple way...

What numbers did you use, and what answers did you get for the three accelerations?