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" ...
- College Physics - Metal sphere 1 has a positive charge of 7.00nC . Metal sphere ...
- physics - A 89 kg solid sphere with a 12 cm radius is suspended by a vertical ...
- Trig - A vertical tower is on a 12° slope. from a 50 m down the hill, the angle ...
- Math - The leaning tower of Pisa is 55.9 m tall and leans 5.5 degrees from the ...
- Maths - On the horizontal plane there is a vertical tower is a vertical tower ...
- trig - On an inclined road, which makes an angle of 25 degrees with the ...
- math - This is the Crailsheim water tower in Baden-Württemberg, Germany. Its ...
- Trigonometry - A 30foot flagstaff is fixed in the center of a circular tower 40 ...
- physics - A .095kg aluminum sphere is dropped rom the roof of a 45m building.If ...