When a negatively charged rod is placed near a falling stream of water, the water is attracted to the rod.?
148778
Because water molecules are polar. This means that one end (the hydrogen) of the water molecule has a slight positive charge and the other end (the oxygen) has a slight negative charge.\n\nThe positive hydrogen pole is attracted to the negative charge on the rod.
358125
A circular force like that must have a center.  If it did not, it would collapse (it would not be a cyclone).  The winding traveling in such a direction, and at high speed, pulls the contents out of the center (into the stream of the wind), just as it does in the outer most circles of it.  Thus, the center is clear of wind and rain.\n\nThe wind forming that clear center is much like water rushing down (to) a sink drain.  ... I don't know if I can explain it better than that... My mind is stuck (for words)...   :)
499916
An ionic compound is dissolved with an appropriate solvent, or otherwise melted by heat, so that its ions are available in the liquid. An electrical current is applied between a pair of inert electrodes immersed in the liquid. The negatively charged electrode is called the cathode, and the positively charged one the anode. Each electrode attracts ions which are of the opposite charge. Therefore, positively charged ions (called cations) move towards the cathode, while negatively charged ions (termed anions) move toward the anode. The energy required to separate the ions, and cause them to gather at the respective electrodes, is provided by an electrical power supply. At the probes, electrons are absorbed or released by the ions, forming a collection of the desired element or compound.
790687
The burning of the fuel (chemical) caused the water to turn to steam (heat) which causes the piston to move the rod (mechanical) which moves the engine,\n\nIf you are looking for more in-depth,
604112
I thing you are referring to surface tension pulling the water up the tube. The water can't be pulled past the end of the tube since there is no tube after that to pull on. In other words the water doesn't know the tube is too short until it gets to the end.
953190
Water is a poor conductor of electricity.
137468
any movement thru a fluid produces static electricity.\nDriving(movement)+ Air(fluid)=Shock.\n\nThe tires insulate the charge from going to ground until you touch it. You are then the conduit to ground.
561732
water displacement and boyles law of bouyancy
858861
1) The gravitational potential energy of water at the top of a waterfall is first converted to kinetic energy (falling) and then converted to both acoustic (sound) and thermal (temperature) energy when it hits the pool of water at the bottom. The temperature of the water in the pool will be slightly higher than the temperature of the water at the top of the waterfall.\n\n2) The thing to remember for this problem is that the energy in a system before some action = the energy in that system after some action:\n\nP0 + K0 + Th0 = P1 + K1 + Th1\nWhere P is gravitational potential energy (mgh), K is kinetic energy (0.5mv^2), and Th is thermal energy (leftover).\n\n22*9.81*4.5 + 0 + 0 = 0 + 0.5*22*2.5^2 + Th1\nSolve for Th1:\nTh1 = 22*9.81*4.5 - 0.5*22*2.5^2 =  902.44 Joules of thermal energy were generated due to friction.\n\n3) Split this problem into two cases, the first 10m and the second 10m. Find the velocity of the crate after the first 10m:\na = F/m = 200/70 = 2.86 m/s^2\nv = sqrt(2*a*d) = sqrt(2*2.86*10) = 7.56 m/s\n\nFor the second 10m, the force of friction on the crate is:\nFf = 0.3*70*9.81 = 206 N\n\nThe net force on the crate is 6N in the direction opposite of movement. The acceleration for the second 10m is:\na = F/m = 6/70 = 0.086 m/s^2\nvf = sqrt(vi^2 + 2*a*d) = sqrt(7.56^2 + 2*-0.086*10) = 7.45 m/s\n\n5) Since watts (W) are measured in J/s and joules (J) are measured in N*m, a watt is the same as N*m/s. Convert lb to N and ft to m to go from horsepower to watts:\n\n550 ft*lb/s * 0.3048 m/ft * 4.45 N/lb = 746 N*m/x = 746 W\n\nPS - You have in your problem description that horsepower is equal to 764 W but that should be 746 W.\n\nI hope this helps!
1051642
The electrical discharge instantly spreads out over a large surface area of the conductor. Which is sea water. The amperage instantly diffuses over a large area sparing the fish.
680198
Your concept of the linesman is correct, however, being immersed in a body of water is dangerous.  Lightning carries a far greater potential than that of what the linesman faces.  True, there is no conduction of current to ground, but the copter and the line must be equalized before contact can be made.  This is because of the state of "STATIC ELECTRICITY".  Energy that is "Static" is not moving.  Nevertheless, when it comes in contact with another object, one who's energy level is at a different potential, the energy no longer remains static.  The sudden rush of current will be felt.  That's why when you cross the rug and grab the door knob you get a shock.  You have a significantly higher potential than the door knob and when you touch it there is a rush of energy trying to equalize the differences.\n\nBeing in a pool at essentially zero volts and a crack of lightning hits close by, the ground and the water in the pool will charge up before dissipating the lightning strike, possibly leaving you dead.  Wouldn't that ruin your day?\n\nDuring lightning storms stay out of the pool or the tub, do not be running the sink and stay off the phone (cordless phones do not apply in this case as there is no direct wiring to the outside world).  There have been documented cases where persons on the phone have been struck in the head by lightning, again it's due to that equalization of energy levels thing.\n\nHey, even if everyone is wrong, wanna risk your life?  You could die in a tub if someone dropped something electrical in the water.  True, your assumption is that water conducts better than the human body, but that is a wrong assumption.  Pure water is an insulator.  It's the impurity in water that makes it conduct.  Our bodies are actually much better conductors of electricity.  Don't believe me?  Ask someone like an electric shop teacher.\n\nI hesitate to give you a test to try because of the danger of electrocution, but if I were at your house I could demonstrate in a matter of seconds that what I am saying is true.  But for the sake of not causing someone to try a potentially dangerous experiment I'll not be specific.\n\nHowever, if you must know, e-mail me and we can chat.  When I am confident of your ability to conduct the test safely then I will tell you how to do this.
71215
Positive.  Current is typically shown flowing from a high (positive) electrical potential to a low potential, often ground.  Electrons would be attracted to the positive potential, and flow toward it, in the opposite direction that current is defined.
179614
When a plate A with no charge is brought near a charged plate B, the plate A which was originally neutral gets charged on either side.\n \nIf  B was +vely charged, the near side  of A gets negative charges because of the electro staitic attraction and the farther side of it  gets positive charges because of electro static repulsion. \n\nThe charges  induced in plate A are called induced charges.\n \nNow there exists a potential difference between A and B. If the plate A is  earthed, all positive charges in it go to the earth  because of electro static repulsion, \n\nThe potential difference increases further.\n\nThere is air in between A and B which is insulating the -ve charge of B to go to the +ve charge of A.\n\nIf the potential difference is high, the air gets ionised and becomes a conductor of electricity and charges from A go to the plate B via the ionised air medium which we call a dicharge.
157508
However unbelievable this may sound, it's true. The nervous system uses electricity of sorts. The water you use to take a shower is not "pure". It has lead in it. Lead is an excellent conductor. When the water comes out of the shower head the molecules are bouncing into the other water molecules as well as the lead molecules. Electricity is actually the breaking off of electrons. You need some kind of force to do that. That's what voltage is and the water molecules are acting as that force. So when you take a shower you also get bombarded with electrons. Just like charging a battery. Those electrons sort of kick your nervous system up a notch for a little bit. Like I said, strange but true.
1017764
It is due to the hydrogens bonding to the oxygens. Water always easily breaks up into H+ and OH-, and therefore attracts polar molecules. Also, keep in mind things dissolved into water are either polar or nonpolar, so it based on what is being dissovled into water, it can either become ionized  (break into particles that are charged) or not.
962965
Here's what happens: imagine you're standing with the Sun at your back looking at a water drop. As a light ray from the Sun hits the drop, it is bent inwards, toward the center of the drop. It bounces off the back of the drop (coming towards you again) and then refracts again on its way out. As a result you see the light ray appearing to come from some point behind the drop, that is, on the opposite side of the sky from the sun (which is where you see rainbows!) \n\n\nBut what about the colors? It turns out that each color of light is bent a little bit differently - red light is bent the least and violet the most. So, each color appears to be coming from a slightly different place behind the water drop. \n\nThe rainbow is circular because only drops located at certain places on the sky (in a circle around the point opposite the Sun) redirect the light exactly back toward your eye. It's only the light from those drops that you see, and hence you see a circle.\n\nanother explaination: This is difficult to envision and to describe, but we'll use some real common sense objects for our model. Picture yourslf standing in front of a tunnel, like you might find under a bridge - a nice even, round, smooth tunnel. Now, if you cast a shadow parallel to the ground, like a shadow from a power line (not the pole, the line - which is parallel to the ground) and let the shadow fall inside the tunnel, you can imagine that the shape of the shadow on the ceiling of the curved tunnel looks as though it is arced, even though the source of the shadow is a straight line. Can you picture that? This is what is happening in the atmosphere. The rainbow is actually a straight line, since light travels in a straight line. Its just that the straight line is falling across a 'fish bowl' like pocket of moist, reflective air, like our tunnel in the model. The rainbow appears, therefore, to be an arc.
56159
negatively charged particles will go toward the positive end of the magnetic field and positively charged particles will go toward the negative end... for two reasons, because the positive is both repelled by the positive part of the field, and its also attracted by the negative end.  oh, and on diagrams, the arrows of magnetic flux usually go from negative to positive.