Physics - September 2007

Watch this:

http://www.youtube.com/watch?v=Bx1E2B5oAEs

Apparently, the media has told us that when steel framed
buildings get very hot, they EXPLODE VIOLENTLY just like
in a controlled demolition, so that all their steel columns tear
apart over dozens of floors (even floors that were not on fire
can even explode??? Why?) converting hundreds of
thousands of tons of steel into shredded metal or red hot
motel metal for over 6 weeks, and turning very strong concrete
floors completely into fine powder EXACTLY like a well
planned controlled demolition!

Powerful stuff, this "jet fuel" (or kerosene); even just a few
small fires on a few levels, can TOTALLY LEVEL giant
skyscraper buildings! Take a look at the evidence that air
fires, fed by jet fuel, can completely pulverise skyscrapers,
without the need for any explosives!

Look at this proof that jet fuel air fire can MELT STEEL!

Amazing!

http://www.youtube.com/watch?v=Qa7PN-8T2VY

http://www.truth911.net

2007-09-09 03:55:05 · 1 answers · asked by Anonymous

2007-09-09 03:21:37 · 4 answers · asked by §eeker 5

of officials and travels a distance of 270 m before exploding. If the officials hear the sound of the explosion 1.1 sec after the car passes their position , what is the speed of sound that day?

2007-09-09 03:14:20 · 1 answers · asked by hellogoodbye54321 3

When an object falls through air, there's a drag force (with dimension M * L/T^2) that depends on the product of the surface area of the object and the square of its velocity; i.e.,

F = C A v^2

where C is a constant.
The constant C has dimensions of _____

2007-09-09 03:05:54 · 2 answers · asked by MD12 2

There are three vectors: A,B,C. Vector A is 70.0 units East of North creating an angle of 28.0 degrees. Vector B is 40.0 units West of North creating an angle of 56.0 degrees. Vector C is 46.8 units straight down South. Their magnitudes are given in arbitrary units. Determine the sum of the three vectors.

a) Give the resultant in terms of components.
Rx = 39.44
Ry = .....?

(b) What is the magnitude of the resultant?

What is the resultant's angle above the +x axis?
.......°


Please help me to do this question. I got Rx = 39.44 by using 70 cos 28 + -40 cos 56 + 46.8 cos 90

help me how to find Ry???????? please
and show me the work also..Thanks :)))))

2007-09-09 02:57:13 · 1 answers · asked by Nikita 1

According to HUbbels law, red objects are the farthest in astomomy although this does not hold true in our own galaxy with stars, some being intrinsically one color or another.

Are Quasars objected thrown out of embryonic galaxies as suggested by some x ray images and even visible light images which suggest a connection between galaxies and quasars as opposed to quasars being on distant edges of the universe

If so would the universe scale be much smaller than thought, quasars being in our local clusters

see: the DVD - Hubble Bubble Your're in Trouble
and the DVD Starlight and Time

2007-09-09 02:21:41 · 2 answers · asked by Anonymous

ocean waves, which travel in the open sea at 5m/s, arrive at the beach once every 4s.
1) calculate the distance between the wave crests in the open sea
2)calculate how long these waves would take to reach the beach if they were formed in a storm 1200km away. (answer in hours)

2007-09-09 02:16:45 · 2 answers · asked by Anonymous

the curvature of space?

2007-09-09 01:41:04 · 4 answers · asked by Anonymous

2007-09-09 01:36:44 · 4 answers · asked by Anonymous

2007-09-09 01:18:03 · 4 answers · asked by Anonymous

Two rooms are connected by a hallway that has a bend in it so that it is impossible to see one room while standing in the other. One of the rooms has three lights switches. You are told that exactly one of the switches turns on a light in the other room, and the other two are not connected to any lights. What is the fewest numbers of times you would have to walk to the other room to figure out which switch turns on the light? And the follow up question is: Why is the answer to the preceding question “one”? (Look out, this question uses properties of real lights as well as logic.)

2007-09-09 01:04:32 · 2 answers · asked by Livelife 1

At the same time a block of iron and an equally heavy iron sphere are released from the top of a slope. Assume that the friction between the slope has a negligible effect on the velocity of the block and the sphere. Which of the two will be down first?

There is this slope prepared for this experiment. Then a block of iron and equally heavy iron sphere is brought to the top of the slope and release from the top of the slope at the same time. OK – assuming that the friction between the slope has a negligible effect on the velocity of the block and the sphere – [who in yahoo answer has the intelligence to tell which of the two will be down first?]

** - very important show your working with answer

2007-09-09 01:04:31 · 5 answers · asked by Anonymous

Already asked this question...but let me give another situation.

People said that it's all in the nature of the surface. but how come any surface i paint with red paint turns red?

what if i make a dent in the surface? will it chance color? the angle light comes in changes do does the surface. Enlighten me.

2007-09-09 00:28:10 · 1 answers · asked by Wolfie 2

2007-09-08 21:21:07 · 5 answers · asked by asheesh 1

2007-09-08 21:16:14 · 7 answers · asked by alokkmaiti 1

when I was younger, I used to think that Nuclear Power Plants used nuclear material to collect electrons, but now I know that it's only the heat given off that creates steam which turns a turbine.
HOW LAME!

Why can't we use nuclear material to create electricity directly?
Or maybe even replace electrons altogehter.. replace the electrons with some other charged particle that repells objects similar to magnatism, maybe then we will no longer need copper wire???? If we could find an alternative to electrons and have repulsion properties, we could re-invent the electric motor, make it so that it works directly from nuclear material??

2007-09-08 18:25:49 · 4 answers · asked by BIGDAWG 4

At the instant a ball is thrown horizontally over a level range, a ball held at the side of the first is released and drops to the ground. If air resistance can be neglected, which ball- the one -thrown or the one dropped from rest- strikes the ground first?

When you answer the question, please also explain WHY, because I don’t just want the answer, I want to learn also =)

2007-09-08 17:49:12 · 1 answers · asked by Anonymous

A position of a runner is given by x=4.10t-0.500t^2, where x is in meters and t is in seconds. What is the average speed between t=0 and t= .820 s?

2007-09-08 17:48:28 · 1 answers · asked by Anonymous

How does the downward component of the motion of a projectile compare to the motion of free fall?

When you answer the question, please also explain WHY, because I don’t just want the answer, I want to learn also =)

2007-09-08 17:48:19 · 3 answers · asked by Anonymous

A position of a runner is given by x=4.10t-0.500t^2, where x is in meters and t is in seconds. What is the average speed between t=0 and t= .820 s?

2007-09-08 17:48:16 · 1 answers · asked by Anonymous

It is expected that the melting point would increase if the experiment isconducted at a lower altitude. Explain briefly why this happens with refernece to the packing of the molecules.

2007-09-08 17:37:35 · 1 answers · asked by Anonymous

The weight of a ball rolling down an inclined plane can be broken into two vector components: one acting parallel to the plane, and the other acting perpendicular to the plane.
a) at what slope angle are these two components equal?
b)at what slope angle is the component parallel to the plane equal to zero.
c) at what slope is the component parallel to the plan equal to the weight?


When you answer the question, please also explain WHY, because I don’t just want the answer, I want to learn also =)

2007-09-08 17:36:04 · 1 answers · asked by book worm 1

What are the magnitudes of the horizontal and vertical components of a vector that is 100 units long, and oriented at 45 degree?

When you answer the question, please also explain WHY, because I don’t just want the answer, I want to learn also =)

2007-09-08 17:35:16 · 1 answers · asked by book worm 1

2007-09-08 17:14:22 · 4 answers · asked by Caysie101 5

A bullet of mass 0.117 kg traveling horizontally at a speed of 200 m/s embeds itself in a block of mass 2 kg that is sitting at rest on a nearly frictionless surface.

What is the speed of the block after the bullet embeds itself in the block?
v = m/s

2007-09-08 17:10:50 · 3 answers · asked by Elvis P 1

Can anyone help me start it off? I'm pretty sure i know the facts i just dont really know how to write a reserch paper

2007-09-08 16:46:02 · 3 answers · asked by Baseball21 2

Who concluded that Acceleration due to gravity was 9.8m/s/s?

Pleasse help!

2007-09-08 16:46:01 · 2 answers · asked by Daniel C 2

2007-09-08 16:42:50 · 5 answers · asked by Anonymous

Assuming 87.5 heartbeats/min, estimate the total number of times the heart of a human beats in an average lifetime of 59.4 yeasrs. Answer in units of heartbeats.

2007-09-08 16:40:31 · 2 answers · asked by Anonymous

How many uranium atoms are there in 8.7 g of pure uranium? The mass of one uranium atom is 4x10^-26 kg;

2007-09-08 16:37:36 · 4 answers · asked by Anonymous