# How high will water get when it hits my knee? [closed]

I was sitting in a spa hot tub and some chute coming down from a chute was hitting my knee.

I'm wondering 2 things

• a) How do I calculte how high the water goes when it hits my knee
• b) How much water does it takes before my knee start moving.

Let's say the water move at $1\over2 m/s$

for B I got

The water flow is about 60 cm large and 4 cm of height

$M =$ 240 Cubic centimeters = 0.24 Kilograms $F =$ $0.24 \cdot$ $1/2 m/s \over 1 second$

right?

edit: why do you tagged this as a homework. geez. I'm trying to introduce myself to physics with some random real world situation. Just want to know want should I use to calulate.

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Hi Dave. Welcome to Phys.SE. I'm closing this as too localized. I'm happy to reopen it if you (or someone else?) could turn it into a coherent conceptional question cf. our faq. – Qmechanic Dec 14 '12 at 22:42
If a blob of water hits a vertical plate, some will splash up, and some will splash down (if the 3rd dimension can be ignored). Before hitting the plate, it has a certain momentum in the vertical direction. After hitting the plate, the part going up and the part going down each have their own momentum. If you sum those two, they are the same as the initial vertical momentum. That plus conservation of energy allows you to tell what velocity the upward splash has, and therefore how high it goes. – Mike Dunlavey Dec 15 '12 at 4:19
@Dave: 1) Your edit v3 should have been a comment. 2) Concerning homework tag, see also here. Note that it doesn't have to be actual homework to be labeled with homework tag. – Qmechanic Dec 15 '12 at 10:38

## closed as too localized by Qmechanic♦Dec 14 '12 at 22:43

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