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Cornell University
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Kai Chen
(I) A constant friction force of 25 N acts on a 65-kg skier for 15 s on level snow.What is the skier's change in velocity?
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Kathleen Tatem
(II) A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 $g$'s. Calculate the force on a 65-kg person accelerating at this rate.What distance is traveled if brought to rest at this rate from 95 km/h?
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(I) A 110-kg tackler moving at 2.5 ms meets head-on (and holds on to) an 82-kg halfback moving at 5.0 m/s. What will be their mutual speed immediately after the collision?
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Averell Hause
(I) What force is needed to accelerate a sled (mass = 55 kg) at 1.4 m/s$^2$ on horizontal frictionless ice?
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Welcome to our next unit on electromagnetic induction. In this unit, we're going to examine the effects of three experiments that were performed by a guy named Michael Faraday. And how those experiments informed what we understand today to be the idea of electromagnetic induction. Those experiments went something like this in the most basic form. He had a magnetic area that he created using a soul annoyed, and it's partially inside that area. He had a circuit with some resistor r here, and he found that when he pulled the circuit out of this magnetic area, he actually generated a current in the loop, which is very interesting. Next he had the same set up, but this time, instead of pulling the circuit, he pulled whatever was generating the magnetic field, the coil, and he pulled that to the left with a velocity V, and he found the same potential appeared across the resistor. Rather, the same current flowed through the resistor interesting and then third, he varied the magnitude of it. So here we have a d b d. T. So there's some change in magnetic field over time and again, he found that there was a current that flowed through the circuit. So with each of these situations, he observed some current that was created by the relative motion of the circuit and the magnetic field area, or by just simply changing the magnetic field with respect to time. So these two experiments led him to posit a new idea that we know today is Faraday's law, which will look at in a couple section. Um, but what? The essential idea is that a magnetic field can create a current under the right circumstance. Um, in fact, we also are because the magnetic field here is technically created by a current through a soul. Annoyed. We're using this current to create a current somewhere else that current to create experience somewhere else. Um, but it's doing so via magnetic field. So we're going to look at these concepts here, uh, in order to understand them fully, though, we're going to have to first understand a little more about what we call emotional. I m f. Which, if you recall IMF is the short term for electro motive force, which is not actually a force. So it's kind of a misnomer, which is why now we call e m F. Previously, we've used the symbol with a curly E to represent emotional e m f. And there were We are also going to need to understand the concept of magnetic flux, which is similar to electric flux, if you remember that from a couple of units ago. So we're going to take a look first at these two concepts. And then we moved on to looking at what Faraday said about these three experiments and how we can use that to predict the interactions between electricity and magnetism.
Inductance
Alternating Current
Electromagnetic Waves
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02:00
03:03
02:15
03:14
08:42
03:34
04:28
02:57
03:23
03:28
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