Getbig.com: American Bodybuilding, Fitness and Figure

Getbig Main Boards => General Topics => Topic started by: ToxicAvenger on March 10, 2011, 11:43:20 AM

Title: Physics Question for Howard
Post by: ToxicAvenger on March 10, 2011, 11:43:20 AM

The Earth  travels through space at an incredible 67,000 mph.



which makes you wonder...
67000miles per hour...comes to 29.94 meters/milisecond ..POINT BEING if you jump up for a milisecond...the earth should move past under you a distance of 29.94 meters..(maybe a wall slams into you!  :D )

why does it not?

i honestly only kinda sorta can fathom an answer....i'd really like a proper answer

Title: Re: Physics Question for Howard
Post by: sync pulse on March 10, 2011, 10:55:37 PM

Because you are also traveling along at the same speed in the same direction.  If you were in an 18 wheeler along a very smooth section of Interstate that is perfectly straight and you are bouncing on a trampoline, it would be as if the trampoline is in a stationary gym...But if the truck turns, accelerates, or decelerates, you would smack into the side of the truck.  

Title: Re: Physics Question for Howard
Post by: ToxicAvenger on March 11, 2011, 05:09:02 AM

Quote from: sync pulse on March 10, 2011, 10:55:37 PM

Because you are also traveling along at the same speed in the same direction.  If you were in an 18 wheeler along a very smooth section of Interstate that is perfectly straight and you are bouncing on a trampoline, it would be as if the trampoline is in a stationary gym...But if the truck turns, accelerates, or decelerates, you would smack into the side of the truck.  

i considered that...

what about a skydiver then, who gets slowed down (from the direction the earth is travelling in) thru wind resistance?

i also thought that the 67000mph speed is a quotient of the expansion of the universe...think of 2 dots on a balloon and then blowing up a balloon...they move further apart at a velocity ...right...

but thats wrong also...our galaxy's motion towards the "big cluster" is independent of the expansion of the universe....

soo we are again left with...whats going on  ???

Title: Re: Physics Question for Howard
Post by: w8m8 on April 21, 2011, 10:37:27 AM

BUMP for Howard ... if he ever gets out of his cave again

I'm interested in his answer

Title: Re: Physics Question for Howard
Post by: sync pulse on April 21, 2011, 01:58:28 PM

Quote from: ToxicAvenger on March 11, 2011, 05:09:02 AM

i considered that...

what about a skydiver then, who gets slowed down (from the direction the earth is travelling in) thru wind resistance?

The atmosphere is also generally moving at the same rate. The localized areas where it is not is called "wind"

Title: Re: Physics Question for Howard
Post by: Roger Bacon on April 22, 2011, 02:41:17 AM

Quote from: sync pulse on April 21, 2011, 01:58:28 PM

The atmosphere is also generally moving at the same rate. The localized areas where it is not is called "wind"

BINGO

Title: Re: Physics Question for Howard
Post by: Nirvana on April 22, 2011, 01:01:54 PM

gravity dopey

Title: Re: Physics Question for Howard
Post by: Howard on May 03, 2011, 03:12:26 PM

Quote from: w8m8 on April 21, 2011, 10:37:27 AM

BUMP for Howard ... if he ever gets out of his cave again

I'm interested in his answer

The surface of the earth is spinning at the equator at around 800 mph.
When you stand on the earth you have inertia due to being on the earth and are moving with it at the same speed. If you jump up you keep moving fwd at the same speed as the earth.
This is also why if you try to jump out of a car at 60 mph , you hit the ground at 60 mph.

Title: Re: Physics Question for Howard
Post by: w8m8 on May 04, 2011, 05:33:33 AM

Thanks Howard  :)