Posted by **sam** on Sunday, September 17, 2006 at 2:40pm.

A 145. drop tower. This is an evacuated vertical tower through which , among other possibilities, a 1m diameter sphere containing an experimental package can be dropped.

a) How long is the sphere in free fall?

b)What is its speed just as it reached a catching device at the bottom of the tower?

c)When caught, the sphere experiences an average deceleration of 25g as its speed is reduced to zero. Through what distance does it travel during the deceleration?

I completly don't understand this question.

which part don't you understand?

For (a), write equation for height (Y) vs. time and solve for the time t when Y=0.

For (b), use V = g t

For c, use the ground-impact velocity V that you get in (b). To decelerate from that velocity within a distance X,

V = sqrt (2 a X)

where a = 25 g

X = V^2/(2 a)

## Answer This Question

## Related Questions

- physics - in Melbourne there used to be a huge shopping centre called "diamaru" ...
- AP physics - A student preformed a sphere drop experiment from 1.50m above ...
- engineering - any help is greatly appreciated. I am so hopeless now. Water tower...
- College Physics - Metal sphere 1 has a positive charge of 7.00nC . Metal sphere ...
- Physics - A man enters a tall tower, needing to know its height. He notes that a...
- Physics - A man enters a tall tower, needing to know its height. He notes that a...
- physics - A 89 kg solid sphere with a 12 cm radius is suspended by a vertical ...
- PHYSICS - A man enters a tall tower, needing to know its height. He notes that a...
- physics - A package in an airplane moving horizontally at 150m/s is dropped when...
- maths - three spheres of diameter 2,3 & 4cms formed into a single sphere.Find ...

More Related Questions