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1. Orientation of Satellites

How are artificitial satellites made to point to the surface of the Earth as they orbit? Is it due their spin angular momentum?
2. About thermodynamics laws

Yeah entropy (A measure of disorder) will tend to increase, meaning that everything will get more disordered as time progesses. Solids (Very ordered), Liquids (Disordered) and gases (Very disordered).
3. Speed of light

No, but apparently swans make good propulsion for early space craft. Light particles or "Photons" are packets of energy that you can't catch. If you were to try and "grab" one with your hand and catch a ride you may be disappointed. Traveling at light speed is impossible for such a large mass as...
4. Floating Halo

"Floating Halo" This is an oversimplification that assumes the earth is perfectly spherical, ignores gravitation pulls from objects other than the earth, assumes that a superstrong material could create a giant structure that can withstand enormous stress and that it's density is constant...
5. Hot water feels cold

I guess it's because of two things: Firstly the transfer of energy from the "hot" particles in the water to your hand. Tempreture is a measure of kinetic energy of particles. A hotter tempreture means a greater velocity of the particles. For heat to be transferred the kinetic energy must be...
6. Racing Hot Wheels cars

Increasing the mass and reducing the area of car exposed to the air would increase the "terminal velocity" of the car down the plane, (If that is the correct term for this situation.) Because all objects fall at the same rate, increasing the mass would not decrease it's acceleration. Also...
7. Neutron Interactions

At a macroscopic level it appears that when two objects collide, they physically interact and the atoms touch. However the charges of the electrons actually repel one another and they don't physically touch. Correct? A neutron however has no charge so what happens when a neutron collides with...
8. Surface tension forces

From what i know: Hydrogen bonding : Occurs between Hydrogen atoms and atoms of oxygen, fluorine and nitrogen. It is the strongest out of the three intermolecular forces listed here. Hydrogen bonds pull the molecules of water outwards, resulting in water being less dense when frozen than when...
9. Supergun compared to nuclear bombs

I don't know. How much would it cost and how long would it take to inrich some weapons grade radioactive material? I'm pretty sure it's pretty costly for time and money. A railgun only requires a metal projectile, a strudy set of rails and a huge amount of electricity.
10. Spacetime - it warps, it curves, but can't expand?

It sounds more like they are disagreeing with the idea that space is an object. Space is nothing. You are talking about the expansion of the universe? I guess the distance between objects is increasing but space cannot increase as it isn't anything.

http://www.answers.com/topic/b-h-curve?cat=technology (electromagnetism) A graphical curve showing the relation between magnetic induction B and magnetizing force H for a magnetic material. Also known as magnetization curve. Just google it...
12. Tabletop to Floor, find Time

For (a) all you need to know is how long the ball was in the air. Consider the ball along the y direction only. What is the inital velocity, displacement and acceleration? Stick thoose values into an equation of motion to find the value of time. For (b) once you know the time the ball is in...
13. Constant Acceleration Question

Actually wait a minute ignore what i said. I assumed because you assumed the equation would be quadratic that it would be... if that makes any sense? You want an equation of speed vs time so you want time and speed to remain as symbols t and v.
14. Constant Acceleration Question

Yeah that looks good. It asks you for a quadratic equation and the only equation of motion that contains a square of t is : s = ut + 0.5at^2
15. Constant Acceleration Question

Yes all is correct expect your equation it's : v^2 = u^2 + 2as or as you would write Vf^2 = Vi^2 + 2ad I think you are confused, we are talking about only the first half of the journey, from the ground to the point where the object is at the point of coming back down (Has zero...
16. Properties Of Gravity

Energy and Matter (Which is energy locked up) bend space time. Although i do not know why..... It doesn't follow a path it's traveling in a straight line. The space time is bent and it is traveling in a straight line through it. You have taken that picture out of context but i think what...
17. Constant Acceleration Question

Ummm... Just a little out, that's over half the speed of light. You were correct to disregard the mass. Firstly i would suggest writing down all the information you know. Acceleration : Displacement: Initial Velocity: Time: End...
18. Supergun compared to nuclear bombs

The railgun is also a kinetic weapon but instead of supplying the vast amounts of kinetic energy with mass it does it with velocity. Fired at many kilometers a second (according to wikipedia) it can hit fast and hard. The benefits of firing large chunks of metal as apposed to nukes include ...
19. Black and White

Yeah basically it is emitting light that is not of the visible spectrum so it appears black. Check out this demo. http://www.usask.ca/chemistry/courses/243/links/BBR/BBR.html
20. Accepted value of G with longitude

Using Newton's equation of gravitation g = -(Gm) / r^2 G = Gravitational Constant r = Distance from centre of body g = "Force" due to gravity m = mass Assuming the radius of the object is 1 meter 0.0000000001 = (6.67300 × 10 ^ -11 x mass) / (...
21. One wing

Sounds more like propoganda
22. Properties Of Gravity

Oops i meant mass and energy bends space time. Thanks alot guys for the clarification on such an unusual subject!
23. Properties Of Gravity

Gravity seems to be a very unusual force. From what i understand: Gravity can bend space-time Gravity occurs with an object with mass Gravity can attract objects through barriers Gravity attracts each unit mass of an object with the same force. Can people add and correct any...
24. Definition Of A Photon?

I have been told many different stories of what light is could someone clarify exactly what it is? At the moment i am being told it travels by displacing matter but doesn't this mean that it would lose energy and eventually die? I thought it was supposed to be stable. Also how does it travel...
25. Questions on observation

I think you may have misunderstood my question? I asked in entanglement why do we think that the entangled particles choose their spins after they are observed?
26. Questions on observation

Due to people who think they know what they are talking about i have heard different anwsers to the same question. By observing a wavefunction of an electron in an experiment such as young's double slit. Does the act of physically being observed with a photon collapse the wavefunction or...