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Riddle (OQ) - IPY

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onewithnature
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Re: riddle(OQ)

Unread postby onewithnature » Sat Jan 05, 2013 8:56 am

:lol: :lol: :thumbs_up:

Maybe we could start by testing out a hotel's validity in Kruger? :hmz:
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Re: riddl e(OQ)

Unread postby okie » Sat Jan 05, 2013 11:29 am

Actually guys , the baloon does not " move backwards " .
In terms of Boyle's law , all the gas/air , inside the vehicle will exert equal pressure in all directions , and will be of equal pressure everywhere within the motorcar - except of course within the baloon , which is filled with a different gas ( Helium ) , and as such have a different pressure within the baloon . Then , the baloon itself has a different mass from that of the two different gases ( the air in the vehicle , and the helium ) .
While the vehicle is standing still , of course the baloon-filled gas is also in a state of inertia , therefore , when the vehicle starts moving forward , any mass that is not fixed or attached to the vehicle , will continue to remain in a state of inertia , unless some form of force/energy is exerted on it . In this case , the moving air within the vehicle will exert sufficient force on baloon in order for it to start moving forward with the rest of the vehicle and its contents .

To sum up , initially the baloon will remain still for a fraction of time , and then it will go forward . But it will remain in the same position relative to the rest of the vehicle , until the vehicle comes to a stand-still , at which time it should continue moving before coming to a standstill in exactly the same position as previously .ie before the vehicle statrted moving .

Q.E.D.
Tread softly , and let your departure not be spoiled by the damage of your arrival

Next :
3 - 6 Sept 2013 - Punda.
7 - 10 Sept 2013 -Shingwedzi .
11 - 13 Sept 2013 - Balule .
14 - 17 Sept 2013 - Satara .

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Re: riddle(OQ)

Unread postby onewithnature » Sun Jan 06, 2013 9:03 am

:hmz: Quod erat demonstrandum? Nice spin on the problem at hand, Okie, but a little question please, if you will ... if the balloon continues moving forward when the vehicle stops, how does the balloon land up in the same position it was when the car began accelerating?
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Re: riddle(OQ)

Unread postby Philip1 » Sun Jan 06, 2013 5:26 pm

Hi all, have a look at this:
Short Answer: The balloon does the opposite to whatever your body would do. Thus, if the car comes to rest the balloon moves towards the back. The key is that the balloon is filled with helium (He) and you are made up of stuff much heavier than air.
Suppose you had the balloon filled with He and tied to the floor of your car, perhaps, around your hand brake and your car is at stopped. If you then 'hammer the gas pedal' you will be pushed back in to your seat whereas the balloon will go forward! Turn left, the balloon goes right. Turn right the balloon goes left, and stop - the balloon goes back.
It has to do with the motion of the air in your car. When you are at rest and then go forward all of the air rushes to the back of the car and you have created an area in the back of your car of higher air pressure. Since He is lighter than air it wants to 'float' away from that area and moves forward.
Answered by: Peter Feeney, B.S., HS Physics Teacher



The movement of a helium-filled balloon is the result of a difference in the density of the surrounding air. Since on Earth, the air density is higher the lower you are in the atmosphere due to the weight of the air itself, the force per square inch (pressure) it exerts on the balloon is less at the top of the balloon that it is at the bottom, resulting in an unbalanced force called thebuoyantt force. If this buoyant force is greater than the weight of an object, as is the case for a helium-filledballoonn, the object will rise in the air, moving toward the airwithh a lower density.
When a car stops suddenly, the air inside the car continues to move forward a little longer than the car itself, due to the tendancy of an object to maintain its motion until a force acts on it (inertia). The air is stopped by the front of the car's interior and tends to 'pile up' there. As a result, the air in the front of the car becomes slightly more dense than the air in the rear of the car, creating more pressure on the front side of the balloon. This causes the balloon to move toward the rear of the car, where the air is less dense, just as the same balloon released outside will move upward, toward the less dense air.
Interestingly, a helium-filled balloon released on board an orbiting spacecraft will neither rise nor fall, since it is the weight of the air that creates the differences in air density here on the Earth. In free fall everything is falling at the same rate and is in a weightless state, so the air is of equal density everywhere on board the spacecraft.
Answered by: Andrew Franks, M.A., Physics Teacher, Lee High School, Midland, Texas
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Re: riddle(OQ)

Unread postby onewithnature » Sun Jan 06, 2013 11:53 pm

Thanks Philip, for the in-depth explanation :clap: ; at least the profs agreed with me. :lol:
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Re: riddle(OQ)

Unread postby onewithnature » Mon Jan 07, 2013 9:35 am

Okay - here's another one:

A depressed man on the 23rd story of a high-rise building finally gives up the ghost and jumps through the open window. However, without anything to cushion his fall, he gets up without a single fracture and walks away (albeit it still sad). How does he manage to survive?
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Re: riddle(OQ)

Unread postby Rooies » Mon Jan 07, 2013 10:02 am

Because he suffered from depression, he also lost considerable weight. It happened to be that hurricane Sandy was hitting his city and when he jumped out, the wind blew him straight back. (I know that for a change, I have this one right, OWN.)
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Re: riddle(OQ)

Unread postby okie » Mon Jan 07, 2013 2:58 pm

He landed on the balcony outside the window :hmz:
Tread softly , and let your departure not be spoiled by the damage of your arrival

Next :
3 - 6 Sept 2013 - Punda.
7 - 10 Sept 2013 -Shingwedzi .
11 - 13 Sept 2013 - Balule .
14 - 17 Sept 2013 - Satara .

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Re: riddle(OQ)

Unread postby onewithnature » Thu Jan 10, 2013 12:53 am

Rooies, Okie ... :clap: :clap: :clap: This is what happens when dealing with such intelligent, lateral-thinking mites - they find creative solutions that cannot be denied. :D Not the answer I was looking for, but I cannot fault either of you (although, Rooies, I would say that few insurance companies would back you on your story :wink: :lol: ).

The explanation I was thinking of is that he is a window-washer who jumped inwards. :thumbs_up:

Anyone with another mind-teaser?
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Re: riddle(OQ)

Unread postby RosemaryH » Fri Jan 11, 2013 2:43 pm

:thumbs_up: OWN, Rooies and Okie :D


The CEO of a company, pops by his office, to pick up some documents he needs to take to an important meeting. He is flying to the meeting on the 3am early morning flight. As he is exiting the parking lot from his office building, the night security officer desperately flags him down. The officer explains, begs and pleads with the CEO not to take his scheduled flight. He explains he had a dream that very night of the plane going down and there are no survivors.
The CEO argues and debates with the pleading security officer which of course leads to a delay, causing him to arrive at the airport late – missing his flight.
The CEO learns that his missed flight indeed did go down – no survivors. When he returns to his office he thanks the security officer most sincerely, pays him a large amount of money to show his appreciation, apologies for not believing him and then FIRES :big_eyes: him!!! Why?
Rose

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Re: riddle(OQ)

Unread postby okie » Fri Jan 11, 2013 2:50 pm

Two reasons - Sleeping on the job , and causing the CEO to miss his flight :naughty:
Tread softly , and let your departure not be spoiled by the damage of your arrival

Next :
3 - 6 Sept 2013 - Punda.
7 - 10 Sept 2013 -Shingwedzi .
11 - 13 Sept 2013 - Balule .
14 - 17 Sept 2013 - Satara .

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Re: riddle(OQ)

Unread postby NetEk » Fri Jan 11, 2013 3:10 pm

The CEO works for the airports company and the security guard not being at his post cause the terrorist to sneak in and plant a bomb on the plane.
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Re: riddle(OQ)

Unread postby Philip1 » Fri Jan 11, 2013 4:03 pm

okie wrote:Two reasons - Sleeping on the job , and causing the CEO to miss his flight :naughty:


Agree with one thing Okie said:
Sleeping on the job
:thumbs_up:
"Lose yourself in Nature and find Peace!" (Ralph Waldo Emerson)
UNITE AGAINST POACHING...What we protect,
do not let poachers take it away!

Extinction is forever and survival is up to---every last one of us!

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Re: riddle(OQ)

Unread postby onewithnature » Sat Jan 12, 2013 6:47 am

I don't know - I daydream a lot at work at night, and my eyes are open all the while. :twisted: Maybe the night guard had his dream while wide awake. :hmz:

Then again, perhaps the CEO decided to open his own company - having been given a lease on life - and fired the security guy so that he could employ him as a nocturnal sage, using his premonitions to protect the CEO from all future plane crashes. :wink:

Despite all this, I think Okie is right. :thumbs_up: NetEk :lol:
EVERYBODY'S TR!
TR: A NEW DAY IS S-OWN
TR: NECTAREAN NICETIES OF THE NORTH
TR: PRIMEVAL PLEASURE

"Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read." (Groucho Marx)

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Re: riddle(OQ)

Unread postby RosemaryH » Tue Jan 15, 2013 6:51 pm

:thumbs_up: Night Security Officer sleeping on the job :)
Rose

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Some great voting going on Don't Miss Out


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