Classical Physics

Undoubtedly we are paving way to the renewable sources of energy. I assume that intensity of heat recieved by a body from a star decreases as we move away from it. (the surface of temperature of mercury is much greater than that of Pluto) I was wondering that instead of having a solar energy system inside our planet, why can't a solar system be sent into space as close to the sun as possible.....perhaps more energy can be derived that way.....to server generations

In discussions I have had lately a curious thing came up. We were discussing the point of when an electromagnet releases its magnetic grip on another electromagnet. To illustrate this consider this scenario. Using two identical electromagnets, EM A is running at 100 watts. EM B is not active, so A is attached to the core of B with the attraction associated with 100 watts. When you increase the power of EM B to 60 watts (60 is a guess of halfway plus 10 for induction), it releases the magnetic grip (just enough to release the grip, not enough to cause a force in opposition) and we move it away 3 centimeters. Then, when the power is removed from B; A is attracted to the…

Can someone explain me the concept of the Critical temperature. What does it mean, where is it applied. Thanks in advance

I got this prolem on a homework a while ago and I couldn't quite make sense of the book answer (and my professor can't really comment on it) say that you have two identical waves traveling along a string, what is the average power of the two waves. I said that it would be twice the power of one wave, because if you imagine two strings that are joined in a Y formation, and you send a wave down the two top ends of the Y, then the two waves join and travel down towards the bottom of the Y. because you put a certain amount of power (p) into each wave at the top you should get twice the power at the bottom (2p). but his was not the solution in the book, the boo…

Can anyone please explain to me why the following phenomena happens ?: When a video projector projects an image on a mirror screen, the image that we see on the mirror, seems to originate from inside the mirror, at a depth inside the mirror which equals the distance between the projector and mirror. On the other hand, when a video projector projects an image on a projection screen (which could be a white wall), we see the same image as with the mirror, only this time it does not seem to originate from within the wall, rather it seems to originate from the surface of the wall. Why is there a difference between these two situations ?. Are the microscopic events …

I'm in high school, taking physics as an elective. We just got through talking about coeffecients of kenetic friction (when c=coeffecient, f=applied force, and w=weight, then on a horizontal plane, c=f/w). Different pairs of surfaces create different coeffecients of kenetic friction; for example, sandpaper and steel have a greater coefficient than ice and soap (duh). My question: Is there any way to predict what the coeffecient between to surfaces without pushing someone over a horizontal surface and without just memorizing the coeffecients?

Ok, potentially dumb question: Why doesn't friction involve surface area? Is the friction force on a 10kg object really the same whether the object's contact area is a square centimeter or a square meter? Mokele

Hey, I'm new here and I'll state right here and now that I know little about physics, so bare with me and try not to laugh too hard Just a thought on gravity that someone here could probably clear up pretty easily for me. Basically, I don't contend that this could explain gravity, I just think it may have some effect, however insignificant. Most of you would know of cosmic radiation. It appears to rain down upon our planet from every conceivable direction in a constant bombardment. Most of you would also have heard of a force called radiation pressure. Have you guessed where this is headed? If radiation is striking the Earth, then it is applying a pressure. …

Hello folks, I'm hoping someone with a better understanding of mechanics might help me with this one... I'm coding a small two player space shooter game with realistic physics. I've made gravity work very well and fast, but I can't seem to solve some of the other problems regarding classical mechanics. (get the game here and have a look!) The ships are able to tow asteroids around in strings, that are supposed to be perfectly rigid, but I can't make it work. Right now they work but are pretty rubbery... So my question is: In terms of X/Y coordinates and vectors, how do you calculate the motion of an object that is attached to another moving object (the sh…

i am suppose to build a mouse trap car for school...it must go 2m forward, pick up an object and go 2m backwards without touching it. i can get it to go forwards and pick up the object but not backwards. my design is fairly simple..there's a string attached to the axle.. the other end is attached to the part that comes down on the mouse. you pull that part back and wind up the string by turning the axle back. when the part that hits the mouse springs forward, it unravels the string and spins the wheel. but i have no idea how to make it go backwards. any hot ideas would be appreciated.

I am sorry if this seems obvious because it just came to mind. AFAIK an object that reverses direction has to stop momentarilly. Eg. a pendulum. How does a photon maintain a constant velocity when reflecting off a surface, lets say perfectly bouncing back along the same path it traveled towards the mirror? Does it stop and then speed up again? This sounds ridiculous, I know.

hey ive been thinking about this for a long while and i cant think of what would happen? heres the scenario: your at a carnival on a gravitron ride (for those of you that dont know its the thing that you get inside and it spins pushing you to the inside wall) you somehow unrestrain yourself and manage to get on your knees and jump twards the center of the ring. once your in the air what would happen would you be pulled back twards the ring? or would you hit the ground then be pulled twards the outside of the ring. if so couldnt you simulate gravity in space by making a big ring and spinning it?

what do you guys think of tackling Goldstein's mechanics on one's own?

I am looking for the above mentioned equation. Ultimately I am trying to quantify the range of pressure difference available for a mop or microfiber material. Also I want to understand how the fiber diameter impacts the pressure head. I have been looking on the internet to no avail. Any help would be greatly appreciated!!!

A man dropped a rock into a well. He heard the sound of the rock hitting the water after 1.89 seconds. Considering the speed of sound to be 332 metres per second. How deep is the well? This is a tricky question, since the rock has an acceleration when it's going down, and the sound have a constant velocity going back up. You guys try it.

The Leaning Tower of Pisa is 55 m tall and about 7.01 m in diameter. The top is displaced sideways by 4.49 m from where it would be if the tower were vertical. The tower is in stable equilibrium right now, but how much farther can it lean before it becomes unstable? Assume the tower is of uniform composition. how do i approach this?

My physics teacher found some devices that measure the period/frequency of an object on a spring. The centripetal force is measured in Newtons with a spring scale, then the known mass is spun around it's string, where someone is applying a constant force by twisting the post below. (The mass then spins around its post, stretching the spring mor eor less depending on the centripetal force on it. A stopwatch can be used to measure the period). This force is only what's needed to make the bottom of the mass align with the post (refer to this diagram): http://img433.imageshack.us/my.php?image=mysterydeviceka3.png The point of this query is our teacher only found the…

Is this real-time whiteboard animation real or fake ?:-

Information on the physics of roller coasters and bumper cars seems to be ready and easy to find, but it seems to be quite a bit harder to find more than a few articles about waterslide physics. Does anyone know where I could find some larger sources of information on the physics or engineering of waterslides, like textbooks? It's a bit of a personal obsession of mine.

I'm "creating" a creature (actually just drawing it, but I want it to be almost like a bluprint with some sound scientific principles). I want to have a flying creature with a special outside shell. The general structure is very odd and doesn't need to be explained but basically I want this creature to actually get some energy from the heat that's generated by the friction from air resistance. This was basically my idea: The surface of the "body and wings" would be made of a hard surface that's actually a series of regularly spaced loops (like the hard side of Velcro only loops instead of hooks), with a pore spaced in between each loop. As the creature dives throu…

Good afternoon everyone, I am in the process of making a micro ornithopter, and I need to calculate how big the wings have to be, and how much lift they will create. (The Body at present weighs 25grams) 1. Is there a formula to calculate the wing area needed to lift a certain weight 2. Are there certain degrees the wing has to move through (whilst flapping) to create this? I have a few more questions but these can wait for the moment kind regards Th3Bozz

The distance between a carbon atom (m = 12 u) and an oxygen atom (m = 16 u) in the carbon momoxide, CO molecule is 1.12angstrom, where 1 angstrom is 1.0E-10 m. How far from the carbon atom is the center of mass of the molecule? Give your answer in angstroms. n.b. "u" is the atomic mass unit or 1.66E-27 kg. However, you do not need to use this conversion as you will find that the "u"'s will cancel. An 0.0200 kg rifle bullet traveling 232 m/s buries itself in a 3.70 kg pendulum hanging on a 2.80 m long string, which makes the pendulum swing upward in an arc. Previous examples worked out the vertical displacement,for this question, determine the horizontal component …

How about an air conditioning that through fine adjustments of pressure can reverse what the air-conditioner does, so that cold air goes outside and warm air comes inside. This could be some form of alternative to burning fossil fuels. The only problem is running the pump which consumes a lot of energy.

I don't know how to find the point on an object where the axis of rotation passes through it. ------------------------------------ Imagine, the above is a thick strip. With only mass 10M on the left and 1M on the right. When it is left falling freely in air, what do you recommend about the rotation of it? I don't know if it rotates around a fixed axis of rotation.

Hi guys... I was wondering if the change in entropy (ΔS) is a state function? I know that S is a state function because its dependent only on S=k * ln W but in class we learned that ΔS_total_irreversible_process > 0 and ΔS_total_reversible_process = 0 wouldn't this mean that delta S is a process dependent non-state function?