why moving pendulum  doesnt produce sond?
609002
It doesn't actually come in contact with anything to cause friction.  When a "machine" makes sound, it is made from the moving parts as they hit or rub against one another.  Since a moving pendulum is relying on gravity and its own weight for the arc movements, it doesn't have anything to rub against.
491270
In contrast to a plane pendulum, which can just swing in one plane, a spherical pendulum can swing in all directions except that the distance to the suspension keeps constant, so the swinging mass is always on the surface a shpere around the suspension.
418445
Are you referring to the Swiss perpetual motion machine?\n\nIf so, probably because no one has been able to duplicate the results at this point.
835380
Seems you need to know the time between steps.\ngravity is constantly pulling down but the steps are only a fraction of the time.\n\nSteps must counter the falling of the lizard and give some upward velocity. say ~4mg?
303378
Hi,\n\nYou know that if electricity is apllied to a coil over a magnet it causes mechanical movement due to the formation of magnetic fields similarly the converse is also true\nthat if mechanical energy is applied to a similar but reverse arrangement electricity can be produced\n\n\nwhen current flows magnetic fields are induced but if a fluctuating magnetic field forms in a ciol electricity is induced
788487
in moving iron type instrument, the torque produced is directly propotional to the square of the current flowing through it. thus the scale is not uniform
141587
You need to read the experimental procedure to see how they want you to do it.  If it doesn't specify, presumably you will need to use a stopwatch.  (The period is the time it takes for one complete swing.)  Time ten swings with a stopwatch and divide the answer by ten.  Do that again to convince yourself that it doesn't matter where you start the pendulum, the period remains the same.
949347
The period of  simple pendulum is\n\nT = 2π√(l / g)      if on such planet g is 1/3 of the Earth then \n\ng = 1/3 (9.81) m/s² = 3.27 m/s²\nl = 1.53 m\nThen\n\nT = 2π√(1.53 / 3.27) = 4.3 s
138588
Simply put, it hasn't been proven or replicated in a controlled experiment by Scientists.  It lacks a scientific base.  \n\nOn another note, there are proven ways of levitation in electric fields of objects that have a very small mass, however, it hasn't been proven for humans or objects of great mass so I wouldn't call it levitation perse.
504085
no since the photons are mass-less, they have no inertia.\n\nand BTW Quantum mechanics and QCD as well as QED, have nothing to do with oscillations, they deal strictly with the emission and absorption of subatomic particles, it is String theory that deals with Oscillations.
4764
You can't balance it because you don't know what it yields.\n\n\nP.S. This needs to be in the chemistry category. You really must not know much about chemistry and physics.
940178
remains constant   coz u have inertia of motion
500385
Depends a bit on what grade you're in.  I'm gonna guess that since this assignment is about measurement in experiments, you're at a pretty basic level in science.\n\nA pendulum is a great thing for doing experiments involving measuring.  All you need is two or three small weights of different masses, a piece of string to tie them to, and a fixed point from which to hang it and let it swing.  With this you can do experiments measuring distance, time and mass.  Does the pendulum's period (the time it takes to swing back and forth once) change as the length of the swing shortens?  Does it change if you change the mass of the weight?  How about the length of the string?  Or, measure how long it takes to go from one swing length (say, 6 inches) to almost standing still (about 1/4 inch for the cutoff).  Does this change with the length of the string, or the mass of the weight?\n\nYou could have a whole table of measurements of the different factors (length of swing, length of string, mass of weight) and determine wich factors are constant and which are variable.\n\n\nA similar experiment is the one where Galileo tested to see if a heavier object actually falls faster than a lighter one.  The old story is that he dropped balls of different weights off the Tower of Pisa.  But what he actually did, is he took balls that were the same size but different weights and rolled them down a ramp, and timed them to see how fast they rolled down.  Can you figure out why he did it this way, and didn't just drop weights from a height?\n\nGood luck!
743140
The Coriolis effect works due to the fact that the earth (different from what is commonly taught in school) is NOT an inertial frame, because of the rotation the earth has; inertial frames are created when an object is moving at constant velocity, and the earth has no lineal movement, the tangential velocity (as vector) is ever changing although it's magnitude is always kept (like in any other rotating frame), then this velocity is not constant it has an acceleration (known as centripetal acceleration) and as a result pseudo forces (like Coriolis force) are created (like when you're in a car and you accelerate, this is called the inertial force).\nThe Coriolis force term can be obtained theoretically (If you want to profoundest I recommend you the book named "Classical dynamics of particles and systems" by Stephen T. Thornton & Jerry B. Marion), and, as seen in wikipedia, this force depends on the velocity mainly (as vector) and the angular velocity (whose cross product changes sign depending on you're on the Northern hemisphere or the Southern hemisphere, and it's cero on the Ecuador, so that this force is equal in magnitude but different in direction in the Northern and the Southern hemispheres at the Tropic of Cancer and the Tropic of Capricorn, for example)\nI did an experiment about the Coriolis effect in my mechanics lab. You can use or build an scaled Foucault pendulum (because an usual Foucault pendulum is just impractical, by the time you need for the effect to be noted and by the size predicted by some theory you need the pendulum to be) and observe how are felt the fictitious forces. As you may see in the theory given by some books, online articles or even the wikipedia for the effect to be seen (precession of the pendulum) it is needed some parameters to have certain values (Rossby number) and by creating and small rotating frame with a relative high angular velocity (for example 34 rpm) you can see, according to the rotating frame, the precession that shows the Coriolis effect.\n\nEdited:\n\nIf you know spanish you can get more detailed information on the Coriolis effect and non intertial frames in http://www.sc.ehu.es/sbweb/fisica/cinematica/coriolis/coriolis.htm\n\nOtherwise, you can even use a translator, this site is worth and for many spanish speaking students in physics from high school to university it's been a good resource...
547508
No. \nThe system is static and the sum of the forces equal zero, but there definately are forces flowing through the bar.  Replace the bar with a piece of plastic and then what happens.  The system is no longer in equilbruim, becomes dynamic and the plastic gets torn to shreads.  The same would be true if say you used a piece of wire.  Just because something is not moving does not mean there are no forces flowing through it.
969863
There is also friction caused by the turning of the gears.  The pendulum need enough mass to overcome this.
855114
the majority of the lost time is not in the wire it is in the switch so you are going to get it wrong\n\nas for the speed in theory electricity flows at the speed of light but in actual use the resistance of the wire and the circuit slows it down but the speed is so great that unless you are talking milliseconds it is instantaneous