Another scientific question....
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Sorry ah, sometimes I just like to ask stupid questions for fun.
There is a plain empty room, except for a 4 foot straight metal pipe in the middle of the room. This metal pipe is 4 feet long, with a 44 mm internal diameter. The pipe was installed vertically, with half its length embedded in the floor and the other half sticking out. Inside this pipe there is a ping pong ball with 40 mm diameter.
You're given the following tools:
- A 5-foot length of sewing thread.
- A 2 litre pail.
- A straight piece of wood, 2 feet long with cross section 15mm x 10mm.
- A mechanical pencil with one piece of lead.
How would you extract the ping pong ball, by just using the above given tools? -
4 foot long metal pipe which is 2 feet long?
but 2 words.. Benoulli's Principle... -
better now..
just a question.. is the pipe sealed on one side? both sides? -
Sorry.....mistake corrected (thanks for pointing it out).
Saturday night lah...not used to being home and a bit blurr. -
Pipe is not sealed at the top end. But of course the lower end is sealed by concrete (since that end is embedded in the floor).
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ARGH!!! PHYSICS!!!
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actually, forgotten if Benoulli's Principle can be used for a tube with a sealed end..
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this is a situational problem
depends on how improvising u r (i m not) -
A 2-litre pail would be useless if it's empty...Originally posted by gentlerock:Sorry ah, sometimes I just like to ask stupid questions for fun.
There is a plain empty room, except for a 4 foot straight metal pipe in the middle of the room. This metal pipe is 4 feet long, with a 44 mm internal diameter. The pipe was installed vertically, with half its length embedded in the floor and the other half sticking out. Inside this pipe there is a ping pong ball with 40 mm diameter.
You're given the following tools:
- A 5-foot length of sewing thread.
- A 2 litre pail.
- A straight piece of wood, 2 feet long with cross section 15mm x 10mm.
- A mechanical pencil with one piece of lead.
How would you extract the ping pong ball, by just using the above given tools?
Internal diameter of pipe is 44mm which translates into 2*pi*radius => radius of pipe is 2.2/pi cm. Hence, the cross-sectional area of pipe is pi*radius^2 = (2.2^2)/pi cm^2. Therefore, the internal volume of the pipe is 4 feet (or 121.92 cm) * (2.2^2)/pi cm^2 which is approximately 189 cm^3.
Since 1 litre = 1000 cm^3, we would require at least 189 ml of water to bring the ping pong ball out.
Since the question didn't state that the 2-litre pail contains water, I assume it didn't. As for the rest of the tools, I simply have no idea.
Therefore, I give up.
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I'll rephrase the question so as not to mislead you too much. The question now has been reduced to "how would you extract the pingpong ball?".
Hint: Its not really that scientific..... -
Pour at least 189 ml of water into the pipe.Originally posted by gentlerock:I'll rephrase the question so as not to mislead you too much. The question now has been reduced to "how would you extract the pingpong ball?".
Hint: Its not really that scientific..... -
No water.....sorry.
But you're getting close.
The only thing scientific about this is biological. -
hahaha looks fun wor.. at first i was thinking maybe can wrap the string around the stick and use it as a sort of pump to suck it up.. yea but its not feasible since the bottom is concealed.
then i tot of using hot air to push the ball out.. making fire is possible, but getting the hot air into the bottom of the pipe is hard. so i think this way oso cannot.
hahaha therefore my conclusion is .. i dun know.. hahah will be waiting for answer -
biological?Originally posted by gentlerock:No water.....sorry.
But you're getting close.
The only thing scientific about this is biological.
u mean urine into the pipe? -
suck it baby
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Bingo! The only way is to urine into the pipe, let the ping pong ball float up...and take it.Originally posted by nightzip:biological?
u mean urine into the pipe?
Sorry, but sometimes childish riddles are the best for weekend relaxation. -
Er....and yes, its difficult enough for guys. And will take a very skillful girl to do succeed.
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Eh, come to think of it....not difficult for guys and girls if....er.....
Oh, nevermind -
lol i was about to ask u if its a must to use all the equipment
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Guys, whilst in the process of urinating into the pipe, don't lose your balance and don't look like you're enjoying it too much.
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why not all mass urine into the pail first, then pour into pipe?