# Homework Help: Ball bearing

1. Oct 3, 2008

### ur5pointos2sl

The question states:
Ball bearing are made by letting spherical drops of molten metal fall inside a tall tower, and they solidify as they fall.

a) If a bearing needs 4.0s to solidify, how high must the tower be?
b) What is the bearing velocity when it reaches the bottom?
c) What mathematical relationship describes the ball's velocity vs time? Acceleration?
d) What mathematical relationship describes the ball's position vs. time?

I wasnt given any formulas and have never taken physics and have no idea where to start this. Any help to get started would be appreciated. Thanks

2. Oct 3, 2008

### Dick

You have to look up the subject of kinematics of an object with constant acceleration. Stuff like y(t)=y0+vy0*t+(1/2)*g*t^2, vy(t)=vy0+g*t. Why are they giving you a question like this if you have no exposure to the subject?

3. Oct 4, 2008

### ur5pointos2sl

Intro Engineering Class. Our professor expects us to just know all of this stuff for some reason. I will look that up and see what I can find out. Thanks

4. Oct 4, 2008

### Dick

Good luck. It shouldn't be too hard to find, any elementary physics book should do. Once you know enough to try to start, let us know if there are any problems.