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### Yaash O'Connors

Physics -Do you belive that we can travel back in TIME ?

9 votes - votes visible to Public

YES

67%

NO

33%

2

3 comments

Hello from kathmandu

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**The Andes Mountains, South America | International Space Station**

Scott: "Good morning, Earth and The Andes Mountains!"

"Happy Sunday to you!"

The Andes is the longest continental mountain range in the world. It is a continual range of highlands along the western coast of South America. This range is about 7,000 km (4,300 mi) long, about 200 km (120 mi) to 700 km (430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). The Andes extend from north to south through seven South American countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina. (Source: Wikipedia)

Credit: NASA/JSC, U.S. Astronaut Scott Kelly

Release Date: August 22, 2015

+Scott Kelly

+NASA Johnson Space Center

#NASA #Space #ISS #Earth #Andes #Mountains #SouthAmerica #Spacecraft #Technology #Engineering #Astronaut #ScottKelly #Photography #Art #Science #USA #UnitedStates #Expedition44 #YearInSpace #JourneytoMars #OrbitalPerspective #OverviewEffect #STEM #Education

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### BioSectorFind

Discussion -How Apps, Wearables, and NanoTechnology are Revolutionizing Healthcare

http://bio.sectorpress.com/News?id=107464

http://bio.sectorpress.com/News?id=107464

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### Sean M

Space -What shape is the universe? The reason I ask is because very few shapes make sense with our current understanding and if we are wrong then what shape could it be

1

4 comments

the problem with that spherical theory is it would suggest a world with no beginning nor end due to infinite space meaning infinite matter so many theories of the universes death would be dis-proven (though that is why they are called theories)

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### Binnoy Panicker

Discussion -1] Sin( ) is a measure of how much perpendicular two objects/forces are.

2] Log(effect) = cause,....10^cause = effect.

3] Transpose of a Matrix = Rotation by 180 degrees.

4] i = rotation by 90 degrees,....i^2 = rotation by 180 degrees, i^3 =rotation by 270 degrees.

5] e^(i.any angle) = rotation anticlockwise by that angle.: e^(-i.any angle) =rotation clockwise by that angle.

6] Cos( ) is a measure of how much aligned two forces are.

7] Diagonal of a matrix is its axis of rotation.

Blog link

http://visualizingmathsandphysics.blogspot.in/

e-book link

https://gumroad.com/l/JXwPU

2] Log(effect) = cause,....10^cause = effect.

3] Transpose of a Matrix = Rotation by 180 degrees.

4] i = rotation by 90 degrees,....i^2 = rotation by 180 degrees, i^3 =rotation by 270 degrees.

5] e^(i.any angle) = rotation anticlockwise by that angle.: e^(-i.any angle) =rotation clockwise by that angle.

6] Cos( ) is a measure of how much aligned two forces are.

7] Diagonal of a matrix is its axis of rotation.

Blog link

http://visualizingmathsandphysics.blogspot.in/

e-book link

https://gumroad.com/l/JXwPU

2

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### About this community

We are enchanted by science. Join us and let's discuss all there is to know about science. We promise not to be boring.

### Binnoy Panicker

Discussion -Pdf book link

https://gumroad.com/l/visualizingmaths-e-book

Blog link

https://visualizingmathsandphysics.blogspot.in

[1] How Sin( ) is a measure of how perpendicular two objects/ forces are.

[2] How cos is at measure of how parallel two forces/ objects are.

[3] i = Rotation by 90 degrees. i^2=Rotation by 180 degrees.

i^3 = Rotation by 270 degrees.

i^4= Rotation by 360 degrees.

[4] Transpose of a Matrix = Rotation by 180 degree.

Transpose of (Transpose of) a matrix = Rotation by 360 degrees.

[5] e^i(angle) = rotation by that angle.

[6] sin(30) = 1/2 because at 30 deg the influence of a force/object reduces to half.

For example the shadow of a stick reduces to 1/2 at 30 deg.

[7] A x B = |A| |B|sin(angle btwn A & B).

total combined impact in cross product depends upon.. . . . .

how strong A is

how strong B is.

How perpendicular A and B are w.r.t each other.

e.g A ball hitting a wall will produce max impact at 90 deg.

Pdf book link

https://gumroad.com/l/visualizingmaths-e-book

Blog link

https://visualizingmathsandphysics.blogspot.in

https://gumroad.com/l/visualizingmaths-e-book

Blog link

https://visualizingmathsandphysics.blogspot.in

[1] How Sin( ) is a measure of how perpendicular two objects/ forces are.

[2] How cos is at measure of how parallel two forces/ objects are.

[3] i = Rotation by 90 degrees. i^2=Rotation by 180 degrees.

i^3 = Rotation by 270 degrees.

i^4= Rotation by 360 degrees.

[4] Transpose of a Matrix = Rotation by 180 degree.

Transpose of (Transpose of) a matrix = Rotation by 360 degrees.

[5] e^i(angle) = rotation by that angle.

[6] sin(30) = 1/2 because at 30 deg the influence of a force/object reduces to half.

For example the shadow of a stick reduces to 1/2 at 30 deg.

[7] A x B = |A| |B|sin(angle btwn A & B).

total combined impact in cross product depends upon.. . . . .

how strong A is

how strong B is.

How perpendicular A and B are w.r.t each other.

e.g A ball hitting a wall will produce max impact at 90 deg.

Pdf book link

https://gumroad.com/l/visualizingmaths-e-book

Blog link

https://visualizingmathsandphysics.blogspot.in

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1

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### Gavin Mounsey

Discussion -How many of you believe that the planet Earth and it`s inhabitants are being engaged by an extraterrestrial presence? (Please vote and feel free to leave comments below to promote open discussion)

1,229 votes - votes visible to Public

Yes, they are here.

53%

No, they are not here.

21%

I am not sure, I require more evidence

26%

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### Gavin Mounsey

Biology -How many of you believe that our consciousness as individuals is nothing more than a byproduct of our physical biology? (Please vote and feel free to leave some comments for others to discuss)

820 votes - votes visible to Public

Yes, it is the result of brain chemistry

33%

No, I am more than just my brain.

50%

I am not sure, but want to find out.

18%

1

Too early to say definitively

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### Nitin R (again)

Space -What would have happened when the universe originated? Is it possible that you years ago, another universe would have existed? Probably before the big bang? if it did what if it did what happened to it is it possible that our universe the same fate?

2

4 comments

+Nitin R The common theory was that there was a singularity, antimatter and matter began to interact, which caused a rapid expansion, which created the universe. The Big Crunch is when the expansion of the universe reverses. The reason why is if the universe's expansion rate does not exceed terminal velocity, then the gravitation of the universe will pull itself into a blackhole singularity, or a singularity similar to that of the proposed Big Bang model. The universe could go past the escape velocity of its own gravity and freeze to death as well. We're not sure.

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### Talha's Physics Academy

Physics -**A bowling ball and feather fall in world’s biggest vacuum chamber**

NASA’s Space Power Facility in Sandusky, Ohio, is the biggest vacuum chamber in the world, measuring 30.5 meters by 37.2 meters, and has a volume of 22,653 cubic meters. If you watched Commander David Scott drop a hammer and a feather on the televised Apollo 15 mission, then you probably already know how this one ends, but that doesn’t make watching it play out any less spectacular.

It was Galileo who first discovered that in a vacuum, if you were to drop two objects from the same height, they’d hit the ground at exactly the same time, regardless of their respective mass. In the atmosphere of Earth, we rarely – if ever – get to see this phenomenon. That’s where this big vacuum chamber comes in

British physicist Brian Cox wanted to see this phenomenon play out in a vacuum, where there is zero air resistance to affect the acceleration of Earth’s gravity. This was filming done for the BBC 2 show, Human Universe,

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