Science Something amazing to tell you concerning physics and motion - Page 5

Jenson71 · 06-04-2009, 10:15 AM

This blows my mind.

Okay, say you have two ball bearings. You hold one in your hand and drop it. The other you put in a gun, point it straight forward, as level as the one in your hand, and pull the trigger, sending it hundreds of yards.

Which one lands first?

The one dropped in your hand right? RIGHT!?!?

No, actually they both hit the ground at the same time.

This is because the vertical component of motion is the same for both objects. They both fall vertically the same distance at about 10 meters per second squared (gravity, actually more like 9.8).

But Jenson, Jenson! What about the horizontal component of the gun-fired ball bearing? Actually, when air resistance is small enough to ignore as it is in this case (being that the bearings are exactly alike), the horizontal and vertical components of a projectile's velocity are completely independent of one another.

And, in this experiment, the gun-fired bearing is constantly falling from the moment it is fired. Yes, it looks like it is holding up in a straight line, but, it's actually falling and it's just hard to see with our eyes. And again, it is falling at exactly the same speed as the ball bearing you released in your hand -- the speed of gravity.

Post more cool science things in this thread.

I think I will later post Aristotle vs. Galileo and gravity, for a little history spin on science.

damaticous · 06-04-2009, 10:59 AM

Quote:

Originally Posted by nstygma

explain why two identical atomic clocks will not read the exact same time after a year if one is at sea level and the other is elevated, say, in denver.

Atmopheric pressure?

DeepSouth · 06-04-2009, 11:00 AM

Quote:

Originally Posted by Sully

You are overthinking it!!!!!
$30-$2 is NOT $27!!

Actually, Jenson is correct.

Ecto-I · 06-04-2009, 11:05 AM

Quote:

Originally Posted by Jenson71

This blows my mind.

Okay, say you have two ball bearings. You hold one in your hand and drop it. The other you put in a gun, point it straight forward, as level as the one in your hand, and pull the trigger, sending it hundreds of yards.

Which one lands first?

The one dropped in your hand right? RIGHT!?!?

No, actually they both hit the ground at the same time.

This is because the vertical component of motion is the same for both objects. They both fall vertically the same distance at about 10 meters per second squared (gravity, actually more like 9.8).

But Jenson, Jenson! What about the horizontal component of the gun-fired ball bearing? Actually, when air resistance is small enough to ignore as it is in this case (being that the bearings are exactly alike), the horizontal and vertical components of a projectile's velocity are completely independent of one another.

And, in this experiment, the gun-fired bearing is constantly falling from the moment it is fired. Yes, it looks like it is holding up in a straight line, but, it's actually falling and it's just hard to see with our eyes. And again, it is falling at exactly the same speed as the ball bearing you released in your hand -- the speed of gravity.

Post more cool science things in this thread.

I think I will later post Aristotle vs. Galileo and gravity, for a little history spin on science.

Actually, if the bullet is fired horizontally at a fast enough speed, it will NEVER hit the ground. Why? Because it is now in orbit and constantly falling.

nstygma · 06-04-2009, 11:05 AM

Quote:

Originally Posted by damaticous

Atmopheric pressure?

nope, time dilation as notorious referred to

nstygma · 06-04-2009, 11:05 AM

Quote:

Originally Posted by Baby Lee

Most of us have something on our person that proves the Theory of Relativity, what is it?

lithium ion battery?

**Baby Lee** · 06-04-2009, 11:06 AM

Quote:

Originally Posted by Fat Elvis

The $25 bill equals ~$8.33 per person.

This leaves $5 out of $30.

The waiter takes $2.

He gives each person $1 in change.

Each person paid ~$9.33 not $9.00.

The group paid $28.00.

That extra dollar was found in bath math fantasyland.

Other way around 3x10=30, 30-3=27=3x9. The 2 is the difference between the 25 billed and the 27 paid.

**notorious** · 06-04-2009, 11:06 AM

Quote:

Originally Posted by Ecto-I

Actually, if the bullet is fired horizontally at a fast enough speed, it will NEVER hit the ground. Why? Because it is now in orbit and constantly falling.

And what would speed would the bullet need to travel to escape Earth's gravitational pull?!?!?!?!

CoMoChief · 06-04-2009, 11:07 AM

Quote:

Originally Posted by BigVE

Dinner bill: $25

3 people gave $10 each for a total of $30.

Waiter automatically pockets $2. $30-$2=$28.

He gives each of the people $1 back meaning they actually paid $9 each for a total of $27.

The extra dollar? He took it. Dang thieves.

This reminds me of those hilarious exam answers.

**Baby Lee** · 06-04-2009, 11:07 AM

Quote:

Originally Posted by notorious

And what would speed would the bullet need to travel to escape Earth's gravitational pull?!?!?!?!

11.186 km/s. More precisely sqrt(2GM/R), where G-gravity, M-mass, R-radius.

**Buck** · 06-04-2009, 11:09 AM

Oh and Baby Lee, to answer your question about the Quadratic formula,

The negative answer probably has to do with what direction you are facing. If you are standing at 0 and everything in front of you is a positive direction (in feet) 1 foot, 2 feet, etc. and everything behind you is negative (feet) -1, -2, etc. then the negative answer for that would be how far it goes behind you???

My english isn't very good in the above sentence, hopefully that makes sense and is the correct answer?

**Buehler445** · 06-04-2009, 11:10 AM

Quote:

Originally Posted by Baby Lee

11.186 km/s.

Dude. WTF. I know -9.8m/s2. That's pretty basic shit.

Why the **** do you know the speed required to escape earth's gravity?
Posted via Mobile Device

**notorious** · 06-04-2009, 11:11 AM

Quote:

Originally Posted by Baby Lee

11.186 km/s. More precisely sqrt(2GM/R), where G-gravity, M-mass, R-radius.

Very good, at the equator. Those NASA guys are pretty smart, aren't they?

orange · 06-04-2009, 11:12 AM

Quote:

Originally Posted by Ecto-I

Actually, if the bullet is fired horizontally at a fast enough speed, it will NEVER hit the ground. Why? Because it is now in orbit and constantly falling.

Quote:

Originally Posted by notorious

And what would speed would the bullet need to travel to escape Earth's gravitational pull?!?!?!?!

Quote:

Originally Posted by Baby Lee

11.186 km/s. More precisely sqrt(2GM/R), where G-gravity, M-mass, R-radius.

I'm sorry, I'm not seeing it. The bullet is fired tangentially to gravity. It has no vertical momentum away from the Earth's gravitational pull. It will simply continue to orbit at the same height.

[edit] Okay, I get it.

KcFanInGA · 06-04-2009, 11:13 AM

When riding in the back seat of a car, and your buddy pisses out of the front passenger window, make sure your window is rolled up.

Frosty · 06-04-2009, 11:13 AM

Quote:

Originally Posted by Jenson71

No, actually they both hit the ground at the same time.

So, you're assuming the Earth is flat here?

06-04-2009, 10:15 AM
Jenson71 fides quaerens intellectum Join Date: Oct 2003 Location: United States Casino cash: $8330900	Something amazing to tell you concerning physics and motion This blows my mind. Okay, say you have two ball bearings. You hold one in your hand and drop it. The other you put in a gun, point it straight forward, as level as the one in your hand, and pull the trigger, sending it hundreds of yards. Which one lands first? The one dropped in your hand right? RIGHT!?!? No, actually they both hit the ground at the same time. This is because the vertical component of motion is the same for both objects. They both fall vertically the same distance at about 10 meters per second squared (gravity, actually more like 9.8). But Jenson, Jenson! What about the horizontal component of the gun-fired ball bearing? Actually, when air resistance is small enough to ignore as it is in this case (being that the bearings are exactly alike), the horizontal and vertical components of a projectile's velocity are completely independent of one another. And, in this experiment, the gun-fired bearing is constantly falling from the moment it is fired. Yes, it looks like it is holding up in a straight line, but, it's actually falling and it's just hard to see with our eyes. And again, it is falling at exactly the same speed as the ball bearing you released in your hand -- the speed of gravity. Post more cool science things in this thread. I think I will later post Aristotle vs. Galileo and gravity, for a little history spin on science.
Posts: 15,986

06-04-2009, 11:09 AM	#70
Buck Take a Chill Pill Join Date: Nov 2006 Location: South Carolina Casino cash: $6180295	Oh and Baby Lee, to answer your question about the Quadratic formula, The negative answer probably has to do with what direction you are facing. If you are standing at 0 and everything in front of you is a positive direction (in feet) 1 foot, 2 feet, etc. and everything behind you is negative (feet) -1, -2, etc. then the negative answer for that would be how far it goes behind you??? My english isn't very good in the above sentence, hopefully that makes sense and is the correct answer?
Posts: 44,604

06-04-2009, 11:13 AM	#74
KcFanInGA I just peed a little on my leg Join Date: Sep 2008 Location: GA Casino cash: $10004900	When riding in the back seat of a car, and your buddy pisses out of the front passenger window, make sure your window is rolled up. __________________ Know what the pillsbury doughboy has between his legs? DOUGHNUTS!!
Posts: 932

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