Brain Teasers

coaledsweat · By: **coaledsweat** On: Fri Aug 08, 2008 9:49 pm

Then the fired bullet hits the ground after the dropped bullet due to the curvature of the earth.

Freddy · By: **Freddy** On: Fri Aug 08, 2008 10:18 pm

coaledsweat wrote:the fired bullet hits the ground after the dropped bullet due to the curvature of the earth.

OK, I'll go for that, but in the first riddle, let's start talking about if the birds wings are going up, or going down. HA! While it's wings are going up wouldn't it be in free fall and weigh nothing?, then when going down weigh twice as much? heeheee!

Riddle: The man that makes it doesn't use one, the man that buys it doesn't want it, the man that uses it doesn't know it. What is it?

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 7:20 am

coaledsweat wrote:Then the fired bullet hits the ground after the dropped bullet due to the curvature of the earth.

Since the trajectory of the fired bullet is so short in distance compared to the Earth's curvature, there would be no real affect. (Let's stipulate that we take the Earth's curvature out of the equation) Now what?

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 7:23 am

Freddy wrote:
coaledsweat wrote:the fired bullet hits the ground after the dropped bullet due to the curvature of the earth.

OK, I'll go for that, but in the first riddle, let's start talking about if the birds wings are going up, or going down. HA! While it's wings are going up wouldn't it be in free fall and weigh nothing?, then when going down weigh twice as much? heeheee!

Riddle: The man that makes it doesn't use one, the man that buys it doesn't want it, the man that uses it doesn't know it. What is it?

No clue on your riddle Freddy :?:

As far as the bird in the aircraft cabin, regardless of the position of it's wings, as long as it's in flight it is not adding it's weight to the aircraft any more. As soon as it lands, it is.

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 7:36 am

OK....I have no desire to drag this out:

Both bullets will impact the ground at the same time.

Gravity effects all objects regardless of their horizontal velocity.

(While the bullet fired from the gun would impact the ground some distance from the firing point & it's trajectory would describe an arc, both bullets would impact the ground at the same time)

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 7:41 am

Next brain teaser:

(and one your kids may ask you some day)

While an astronaut is weightless as he orbits the Earth in his spacecraft, a passenger on a high flying commercial aircraft (just a few thousand feet below) weighs pretty much the same as he does standing on his bathroom scale & walks about the cabin normally.

Why?

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 8:14 am

Another:

While a 3 ounce set of keys thrown into the ocean will immediately sink, an ocean liner (made of the same metal but weighing several housand tons) will float.

Why?

coaledsweat · By: **coaledsweat** On: Sat Aug 09, 2008 8:58 am

Devil5052 wrote:
coaledsweat wrote:Then the fired bullet hits the ground after the dropped bullet due to the curvature of the earth.

Since the trajectory of the fired bullet is so short in distance compared to the Earth's curvature, there would be no real affect. (Let's stipulate that we take the Earth's curvature out of the equation) Now what?

It would if the earth was flat, it is not. Whatever the earth's curve is would add time to the drop of the fired bullet whether it be 1/4" or 2". That is why I asked the trajectory question. At 5' the horizon is what, 8 miles at most, that is some curve and will add significant distance to the fall of the bullet. whether it is an 1/8" or a foot, the fired bullet will have to travel a further distance to the ground which will require more time.

If the earth were flat, yes, they would hit the ground at the same time.

coaledsweat · By: **coaledsweat** On: Sat Aug 09, 2008 9:01 am

Doesn't use it? A coffin.

The keys and boat. The keys weigh more than the water they displace, the boat does not.

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 9:19 am

coaledsweat wrote:If the earth were flat, yes, they would hit the ground at the same time.

LOL.....You just love to argue!!

The curvature of the Earth would change things by such an infinitesimal amount that I said let's stipulate that we will take it out of the equation for this teaser.

coaledsweat wrote:The keys and boat. The keys weigh more than the water they displace, the boat does not.

Exactly right! "Displacement" is the key. (any object will sink if it weighs more than the amount of water it displaces & float if it weighs less than the amount of water it displaces.

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 9:21 am

coaledsweat wrote:Doesn't use it? A coffin.

Missed your answer....I like it!

Care to try my weightless question?

coaledsweat · By: **coaledsweat** On: Sat Aug 09, 2008 9:29 am

I'll wait, I don't want to pig up the whole thread, there are still a few geniuses out there that may want a crack at these.

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 9:51 am

coaledsweat wrote:I'll wait, I don't want to pig up the whole thread, there are still a few geniuses out there that may want a crack at these.

Good idea!

Freddy · By: **Freddy** On: Sat Aug 09, 2008 10:42 am

Shape the key like a boat & it'll float just fine.

The astonauts & airplane passengers...... stall the engines, let the airplane fall, the passengers are now weightless, just like the astronauts. The reason the astronauts seem weightless is because they are falling......fallling around the Earth, they just happen to fall at the same rate of speed that the curve of the Earth has.

Good call coaledsweat! Yes, a coffin.

I'm going on vacation... see you in a week!

Devil505 · By: **Devil505** On: Sat Aug 09, 2008 12:20 pm

Freddy wrote:The reason the astronauts seem weightless is because they are falling......fallling around the Earth, they just happen to fall at the same rate of speed that the curve of the Earth has.

Nailed it Freddy!!
(Amazing how many people don't understand this)

Have a nice vacation! :devil:

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