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 Physics Forum Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

# Vectors

## Vectors - Physics Forum

### Vectors - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#11
12-20-2004, 06:02 AM
 Don. Shead a'course Guest Posts: n/a
Vectors

Even from a toy bow, the arrow starts to fall as soon as it leaves the
string: We're talking about straight line vectors here aren't we? That
do not represent downward components.

Newton's First Law does not apply to real motion: Gravity is universal.
All motion is affected by it, and is either elliptically and spirally
curved or geodesically warped.

#12
12-20-2004, 06:02 AM
 Don. Shead a'course Guest Posts: n/a
Vectors

Even from a toy bow, the arrow starts to fall as soon as it leaves the
string: We're talking about straight line vectors here aren't we? That
do not represent downward components.

Newton's First Law does not apply to real motion: Gravity is universal.
All motion is affected by it, and is either elliptically and spirally
curved or geodesically warped.

#13
12-20-2004, 11:11 AM
 Jeremy Watts Guest Posts: n/a
Vectors

"Don. Shead a'course" <[Only registered users see links. ]> wrote in message

despite the fact that its been emormously successful in helping to send
satellites into orbit and men to the moon for the past 40 years.... yes ok,
doesnt apply to real motion.

#14
12-20-2004, 11:56 AM
 Don. Shead a'course Guest Posts: n/a
Vectors

It's use as an initial reference velocity is where it's helped orient
and aim satellites.

Once that's done we use Newton's Second Law to guide the magnitudes and
directions of the rocket thrusts that eventually get them to their
distant destinations.

#15
12-20-2004, 03:36 PM
 ah Guest Posts: n/a
Vectors

Gordon wrote:

Gah! My math was awful!
--
ah "You can never put your nose to the same spot
on the same grindstone. And there is no change
but that it grinds." ~Theresa Gates
/My Grandfather's World/
#16
12-20-2004, 03:37 PM
 ah Guest Posts: n/a
Vectors

Double-A wrote:

No; but I can imagine the blisters!
--
ah "You can never put your nose to the same spot
on the same grindstone. And there is no change
but that it grinds." ~Theresa Gates
/My Grandfather's World/
#17
12-23-2004, 09:17 AM
 Mark Fergerson Guest Posts: n/a
Vectors

Michael Hearne wrote:

Things in orbit have not reached escape velocity. If they
did, they wouldn't be orbiting any more. Mercury capsules
never got out of orbit.

It got Welfared to death.

Mark L. Fergerson
#18
12-23-2004, 01:17 PM
Vectors

Michael Hearne wrote:

<snip repost>

hour? I

Project Mercury's Friendship 7 (orbital flight of John Glenn) maxed out
at over 17,000 miles per hour on February 20, 1962:
[Only registered users see links. ]
This was at an apogee of 162 miles - just barely outside of the
atmosphere.

In 1962 the record for *aircraft* (pilot, engine, airfoils, control
surfaces, etc.) was 1665.89 mph (2.188 mach). The 1976 record (the
latest I could find for a piloted aircraft) was 2193.16 mph (2.881
mach).
[Only registered users see links. ]

The (unpiloted) X-43a "scramjet" reached reached 5,000 miles per hour
on November 16th, 2004:
[Only registered users see links. ]

Nice use of irony.

Just east of Amarillo, TX, SE of the Pantex plant, near Highway 287
about 3 miles east of Washburn:
[Only registered users see links. ]
I lived in Amarillo for a few years...
..
..
Tom Davidson
Richmond, VA

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