running...

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

on a dream

april showers
may bring
may flowers

Your such a romantic, can we have children? 😉

-DF

Doug Freese said:

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

on a dream

april showers
may bring
may flowers

Your such a romantic, can we have children? 😉

f clown df

what tkb wants
tkb gets

tkb

TenKBabe said:

Doug Freese said:

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

on a dream

april showers
may bring
may flowers

Your such a romantic, can we have children? 😉

f clown df

what tkb wants
tkb gets

tkb

This message is brought to you by NetAlert:

tkb:
Your prose is a copyright infringement. Ultrajohn
has exclusive rights to the above style and message.

Please cease and desist immediately.

However, NetAlert does wish you the best in obtaining
"what tkb wants".

Re: Ballistic Theory and the Sagnac Experiment

Group: sci.astro Date: Tue, Apr 4, 2006,

It's one thing to be clueless... It's another thing to be clueless and
arrogant.
(Not meant for anyone or thing)
just interesting:
takeing from people with brains or intellegents and cut and slicedand
put in this group: again not ment for anyone.
(snow e again here)

SEVERAL bullets, NOT JUST ONE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Why don't you look at Jeff's animation before criticising:

http://www.freemars.org/jeff2/Doppler.htm

Look till you're blind! You will not see any reference to what ALLOWS
the magical stop/ start.

The rifleman's feet stop moving when he stands still.
The whole shebang "animates" massless guns and bullets
(sic imaginary), and otherwise ignores any and all energy requirements

Complete garbage, I gave you the table of energies twice with values of
64 and 144.

What is "garbage", is WHERE, (using these toy numbers), the 80 'units'
of energy were conjured from, or vanished to. Question to GD:
Can energy be created or destroyed"?

Jim, that is just basic Newtonian mechanics. The 64 units comes from the
charge in the gun. The extra 80 units comes from the rifleman's
breakfast which give him the energy to move his legs. The kinetic energy
of the bullet does damage in the target by breaking chemical bonds and
mostly ends up as heat as it is stopped by friction. The total energy is
conserved. Surely I don't have to explain this to you, I had hoped we
could talk at a more advanced level.

Note that the rate numbers are counted between the first and second
bullets. In fact all of the discussion for weeks has been about rates
which require multiple bullets.
And not ONE attempt to address the issue of the target which sustains
damage OTHER THAN indicated from (3), and in full agreement with (4)
In which scenario is the damage "OTHER THAN indicated from (3), and in
full agreement with (4)". I don't think you are talking about scenario
(2) which is the only other one that fits that description.
So you don't think a flying plane-mounted machine gun does more damage
than a stationary one, ref a target?
It does more damage, as you can see from the table where I calculated
144 units of energy for the situations where the rifleman was moving and
only 64 units when he was stationary. I keep telling you that, when are
you going to listen?
This is rank stupidity-- you don't believe that yourself!
Correct, I don't believe it, as I have said over and over again.
(but keep repeating it)
What I have always said is that the energy is the same if the rifleman
is standing still when he fires regardless of whether he changes
position between shots, and greater if he fires when moving regardless
of whether he changes position between shots. If you don't like that,
take it up with Newton, he said
    KE = 1/2 m v^2
It's not perfect but good enough for this conversation.

42°N,83°W 90°N,180° 90°lat,
3rd planet from the Sun.
Milky Way, Orion arm.
U.S.A., Michigan. west of Port Huron
Bottum of Lake Huron.

On Wed, 05 Apr 2006 12:04:50 GMT, "Doug Freese" <[email hidden]>

Quoted message said:

Your such a romantic, can we have children? 😉

He just offered you his butt Ultrajohn. DO HIM, DO HIM! Make us a
video of the [censored] goin' down on you.

Re: running...KE=1/2v^2(5800)

It's one thing to be clueless... It's another thing to be clueless and
arrogant.

(Not meant for anyone or thing)
just interesting:

http://www.freemars.org/jeff2/Doppler.htm

So you don't think a flying plane-mounted machine gun does more damage
than a stationary one, ref a target?
This is rank stupidity-- you don't believe that yourself! Correct, I
don't believe it, as
What I have always said is that the energy is the same if the rifleman
is standing still when he fires regardless of whether he changes
position between shots, and greater if he fires when moving regardless
of whether he changes position between shots. If you don't like that,
take it up with Newton, he said
    KE = 1/2 m v^2
It's not perfect but good enough for this conversation.
                              42°N,83°W

These materials were developed at the NSF 1998 Faculty Enhancement
Conference Teaching Introductory Physics, Conservation Laws First; the
III.

1. Students do not understand that the force of static friction can take
on any value up to the maximum value determined by msN, and can point
either in the direction of motion or opposite to the direction of
motion, depending on the circumstances.

II. Interactive Lecture Outline (Back)
This interactive lecture is designed to introduce projectile motion.
Student feedback is useful to the instructor to gauge the level of
explanation necessary at each step. Responses may be in the form of
"flashcards" marked with letters; all students hold up their flashcards
at the same time to report their answers to the questions below.
Students may use more than one flashcard if they think more than one
answer is correct. This lecture does not necessarily involve having
students discuss their answers Peer Instruction-style, however -- that
is up to the instructor.
Each question should be printed on a separate overhead transparency.

A bean bag is placed on a horizontal surface. The bean bag is given a
push by a hand to start it sliding and then the hand is removed. [Note:
push a bean bag or eraser on a surface as a demo, or have each student
slide an object such as a coin on his or her desk.]

After the hand is removed,
a) The bean bag continues at a constant speed
b) The bean bag speeds up
c) The bean bag slows down
d) The speed is always zero
The motion we have been describing is along the surface, or horizontal.
What is true of the velocity in the vertical direction after the hand is
removed?
a) The bean bag continues at a constant speed
b) The bean bag speeds up
c) The bean bag slows down
d) The speed is always zero
After the hand is removed, what forces are acting on the bean bag?
a) Force of the push
b) Gravity
c) Friction
d) Normal force
Which of these forces act in the horizontal direction along the surface?
a) Force of the push
b) Gravity
c) Friction
d) Normal force
Which of these forces act in the vertical direction?
a) Force of the push
b) Gravity
c) Friction
d) Normal force
We have agreed that the velocity in the vertical direction is always
zero. {Note: This is a review of previously covered material.} What is
true about the acceleration in vertical direction in order for that to
be true?
a) The acceleration is negative due to gravity
b) The acceleration is positive due to the normal or contact force
c) The acceleration is zero
What does this tell us about the net force in the vertical direction?
[Remind students of the meaning of the word "net": Like net income, the
amount that remains after taxes and other deductions, net force is the
total amount of force left after some of the contributing forces balance
each other out].
a) The net force is negative due to gravity
b) The net force is positive due to the normal or contact force
c) The net force is zero
[Remind students that F=ma; acceleration causes change in velocity; no
change in velocity means no acceleration or no net force in that
direction. This would be true for any constant velocity, not just zero].
What is true about the net force in the horizontal direction after the
hand is removed?
a) Frictional force causes a negative horizontal acceleration.
b) Frictional force causes a constant horizontal speed
c) Frictional force and the "push" cause a zero horizontal acceleration
We have concluded that the bean bag slows down in the horizontal
direction, along the surface, because there is a negative acceleration
caused by the frictional force.
The bean bag has a constant, zero velocity in the vertical direction
because there is no net vertical force -- the gravitational force and
normal force are balanced -- and the initial vertical velocity is also
zero. {Draw a free body diagram, indicate the acceleration with an
arrow}
Now consider a new situation: A ball is launched horizontally from a
pop-gun.
After the ball leaves the pop-gun, what forces are acting on the ball?
a) Force of the gun
b) Gravity
c) Friction
d) Normal force
Which of these forces are acting in the horizontal direction (along the
surface)?
a) Force of the gun
b) Gravity
c) Friction
d) Normal force
Which of these forces are acting in the vertical direction?
a) Force of the gun
b) Gravity
c) Friction
d) Normal force
You have stated that the force of gravity acts in the vertical
direction. What can you say about the velocity of the ball in the
vertical direction after it leaves the gun?
a) The velocity decreases in the positive direction (upward)
b) The velocity increases in the negative direction (downward)
c) The velocity remains constant in the negative direction (downward)
You have stated that there are no forces acting in the horizontal
direction. What can you say, therefore, about the horizontal velocity of
the ball after it leaves the gun?
a) The horizontal velocity increases as it goes farther from the gun
b) The horizontal velocity decreases as it goes farther from the gun
c) The horizontal velocity does not change as it goes farther from the
gun
d) The horizontal velocity is always zero
The horizontal velocity does not change. The vertical velocity increases
in the downward direction. The horizontal and vertical velocity vectors
can be added together to show the net velocity vector.
{An interactive physics demo is helpful, showing an object launched
horizontally moves with constant horizontal velocity and increasing
vertical velocity. It is great if the component velocity vectors and the
net velocity vector can be shown so students can actually see the
lengths of the vectors.}
Final topic to cover: Projectile launched at an angle: what is the same
and what is different?
III. ConcepTests and Conceptual Questions (Back)
1.
A car makes a turn at constant speed on a circular segment of the road,
as shown above. The direction of the acceleration when the car is at
point A is

Answer: c) The acceleration associated with circular motion at constant
speed is directed along the radius of the circle (perpendicular to the
motion at any given instant).
2.
A car speeds up as it merges onto a freeway, as shown above. The average
acceleration in going from point A to point B is in which direction?
Answer: d) There is both an increase in speed, indicating an
acceleration parallel to the direction of motion, and a change of
direction, indicating acceleration perpendicular to motion. Average
acceleration is in the direction of the change in velocity; so drawing a
velocity vector at A and one at B (greater in length than the one at A)
and constructing vb-va gives the direction of the average acceleration.
3.
A block with inertia m is attached to a spring on an inclined plane and
allowed to hang unsupported. As a result, the spring stretches to length
L. Which of the following graphs most accurately shows the extension of
the spring (beyond its equilibrium length) as a function of the angle q
of the incline?
Answer: d) The spring is shortest when the angle is zero (no incline)
and largest when the angle is 900 (block hangs from spring with no other
support) so that indicates the answer must be b), d), or e). The force
acting on the spring causing it to stretch has magnitude mgsinq and the
amount of stretch is proportional to the force, so d) shows the proper
functional form.

5. A ball is attached to a horizontal rod which is fixed at the left
end, and the ball is released from rest.
Answer: a) The force of gravity causes the ball to accelerate downward,
so the force displacement has a component in the same direction as the
force. Hence the work done is positive. (The dot product of the ball's
displacement and the downward force of gravity is positive.)

Doug Freese said:

Your such a romantic, can we have children? 😉

If it works out, can you reserve one of the litter for me? :oP

Ebenezer Scrooge said:

It seems to have worked for your parents.

Impossible. My mom didn't have an ass.