Tangential acceleration problem

1. Jan 9, 2008

kagekiri

1. The problem statement, all variables and given/known data

(a) What is the tangential acceleration of a bug on the rim of a 12.0 in. diameter disk if the disk moves from rest to an angular speed of 75 revolutions per minute in 3.0 s?

(b)When the disk is at its final speed, what is the tangential velocity of the bug?

(c) One second after the bug starts from rest, what is its tangential acceleration?

What is its centripetal acceleration?

What is its total acceleration?

° (relative to the tangential acceleration)

2. Relevant equations

I know for a fact that all of them have to be in m/s squared.

3. The attempt at a solution

(a) 0.78 m/s squared

(b) 2.4 m/s squared

(c) 0.78 m/s squared

2. Jan 9, 2008

HallsofIvy

Staff Emeritus
That's not an attempt at a solution, that is a list of answers. Please show us how you got those answers.

3. Jan 9, 2008

kamerling

You probably used a radius of 12.0 inches and not a diameter of 12.0 inches.

The answer to b) should be m/s and not m/s squared

4. Jan 9, 2008

Shooting Star

The unit of accn is m/s^2. All the answers should be in that unit, or equivalent.

Edit: I am extremely sorry. Just an oversight. The answer to (b) should be the unit of speed, as said by kamerling.

Last edited: Jan 9, 2008