Classical Physics

This is a simple exercise but I can't solve it... A 10m 9000N beam is risen up by two parallel wire ropes (a=0m/s^2), one attached to one end and the other 1m from the other end. At what force each wire rope is rising the beam? Sorry for the broken English.

I have a projectiles problem, ive been puzzling for hours and just cant seem to work it out! Its probably so simple but if someone could point me in the right direction please help! A stone is hurled into the air on level ground with a horizontal component of velocity 30m/s and a vertical component of 20m/s. How long before the stone falls to the ground? Do i have to find the resultant velocity, then the height before i can work it our or do i just use acceleration due to gravity? Im so confused!!! :confused:

an object is thrown vertically upward from the earth;s surface with certain initial speed. it rises to a maximum height and then falls back to the starting point. what is the wrok done by the by the gravitational force in the process?exaplain ANSWER is the total work done by the gravitational force is zero as work is done against the gravitational force by the object during the upward journey. and the same magnitude of work is done on the object in the downard journey I noticed this thread in a forum. However, my answer does not reconcile this one. I think since v^2 is a vector and it changed, hence KE is changed since magnitude is unchanged but direction is ch…

Why can charges move from a cloud in the sky downwards the ground? I know the principle of it, but I don't know the difference between it and the things about induced emf in a conductor. There's an emf induced when a conductor cuts magnetic field lines generally and emf is induced. But, taking lightning to be considered, both of them are not involved in a complete circuit, so why there's a difference? The magnitude of the emf induced?

[math]F = G\frac{M_1 M_2}{d^2}[/math] Does this equation make the presumption that the Earth is a point gravity source? It seems so becuase taking d down to low values (i.e. close to the center of the Earth) there would be practically no gravity due to it being cancelled out in every dirction, though the formula suggests that it should approach infinite force. Is there a modification of this formula that takes into account the radius of the masses? (presuming they are spherical)

The challenge is to build a fully GRAVITY-powered device that will shoot badminton birdies from the floor into an average basketball net, and given 2 minutes to shoot at least 10 birdies into the net. Physics experts are wanted in coming up with a design with this project.

We know that temperature indicates the overall kinetic energy of an object, like air, water, metal, etc... however, if air and water exist in room temperature, how come air remains gas while water remain liquid? doesn't that contradict the kinetic theory of atoms which the particles in liquid have less kinetic energy than particles in gas??

Why is a falling column of water thinner at the bottom? I don't understand why this is...

hi guys. Im searching for a very rare book, from a russian guy: Title: Motion of an artificial satellite about its center of mass. autor: V. V. Beletskii, 1966. language : english There is a copy of this book on some universities of usa, but i cant get it. I really need this book. If some body help me i will appreciate. I have a large collection of books of matematics and physics in format djvu and pdf, that i can give. My email is paletonbengo@yahoo.com Thanks a lot

I have heard that the main obstacle to producing a portable railgun, apart from miniaturizing the power source, is the immense recoil involved in launching an object at such a speed. Can this be solved by making it a two-way railgun, i.e. so that the mechanism, at the pull of the trigger, in addition to launching the projectile, launches an object of equal mass and velocity to the projectile in the diametrically opposite direction? would this neutralize recoil? This is the principle used in the Bazooka, for instance.

In my figure, the whole circuit is being pulled to the right. AD experiences no change in magnetic field. Why do we apply the Fleming's right hand rule on the loop AD instead of BC? And, if the whole circuit is moving in the uniform magnetic field, if the shape of the circuit is like the above one, there's no induced current. Is this also true for a circular one? Thanks for kind attention to my thread.

Wanna share an interesting thing with you, so I started this thread. It seemed that I used to know and understand reason for the introduction of high voltage before entered the magnetism. Today, when I had a read on a thread in another forum, I strived to recall my memory again. Then, I found myself totally confused. May I tell you my confusion. [Math]P=VI [/Math] V increases, then I decreases. [Math] Power loss=I^2 R[/Math] I used to this approach for the interpretation. Today, I was reminded of thinking it in the V way. [Math]Power loss=V^2/R[/Math] Voltage is indeed increased, according to the equation, Power loss should increase accordingly. However, the fa…

Hi, Can someone briefly explain what kinetic thrust is? thanks madazn:D

how many calories are in a cubic meter of air?(room temperature plz) and by calories i mean thermal units, not the thing i'm trying to burn to lose weight, but the calories that heat 1 liter of water by 1 degree celsius. or BTU's can be used instead of calories.

whats the return, or formula for how much psi(pounds per square inch) is made when fuel is burned in an engine( like a standard v-6)?

grrr, my physics text is confuzzling! it says w=fd it says it is a scalar, and it also says w=fdcosx f and d are vectors so, you can't just multiply them. which one is a magnitude or is it both? it looks like it is trying to get a projection of one vector on the other. that would make sense, but it said it was a scalar. is it a dot product? that would give a scalar.

A while ago I found out a sound that make everything in my room shake, the volume was constant (for those who've played homeworld 2, its the sound that it makes when you press space bar to zoom out and in to the world map) Any one have any idea what this frequency is? My suitemate is blasting his shitty hiphop again. I haven't found any bass deep enough to mimic the vibrations to launch a successful counterattack. Or, other ideas of counterattacks would also be appreciated.

Magnetic north pole aligns along the magnetic field line? and if the force is big enough, it will be attracted along the field lines? On the other hand, when we determine the force on charges, we use the Fleming's Left-hand rule?

are there other tough newtonian & relativity mechanics books besides daniel kleppner's intro to mechanics and french's two volumes of mit series? i mean with respect to the problems.

If you repel something with an electromagnet, is the electromagnet pushed with an equal force in the opposite direction from what it pushes? For instance: In the core of a fusion reactor, plasma is confined by a magnetic field that basically equals the pressure inside the core of the sun. Does this mean there is a huge pressure outwards, on the walls that the magnets are mounted on? How big is this pressure?

Do magnets have energy, and if yes, can you get them to do work? Sorry again for the n00b question..

as in angular momentum = displacement vector x linear momentum Can someone please explain to me what the displacement vector is? I tried looking on wiki, but to no avail.

I am sure this topic has been discussed before. However, I would like to consult the members of the forum about it. The whole class had a debate with the physics teacher and it left all of us even the physics department baffled. Is running a marathon considered work done considering that the runner has exerted a force and due to such an exertion it made his body moved. I would prefer a detailed answer to my question as I hope to take the replies to class so that we can debate on it further.

Does anyone know where to find a list of basic year 1 and 2 equations for classical mechanics? I.E. conservation of energy, torque, etc. etc.

i have these magnet bars, but they are very weak. I want to magnetize them more, so they could be stronger, but i don't know how. I tried wrapping around a wire and connecting it to a current, but didn't work. I don't think i did it right. If anyone can help, that would be super!! Thanks in advance!