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02:55

Keshav S.

(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?

04:39

Muhammed S.

(I) A 7150-kg railroad car travels alone on a level frictionless track with a constant speed of 15.0 m/s. A 3350-kg load, initially at rest, is dropped onto the car. What will be the car's new speed?

03:38

01:24

Kai C.

(I) What is the magnitude of the momentum of a 28-g sparrow flying with a speed of 8.4 m/s?

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welcome to our first example video. Looking at the simple circuits we considered an alternating current we're going to consider first of all, a circuit that is simple. Resist er circuit with a source that looks like 120 volts times the cosine of omega T, where omega is equal to two pi times 60 hertz. So f is equal to 60 hertz here. Okay, given this we are actually going Thio not consider just this simple, but make it a little bit more inkley and give us a second Resist er we'll say we have two resistors of 10 homes and 20 homes and I would like to know first of all, what is the maximum voltage across each of these resistors? So this is actually a pretty simple problem. We in fact, we could redraw it as being a battery problem that we've seen before with direct current saying we have 120 volts and we have a 10 ohm resistor and a 20 ohm resistor and ask ourselves well how maney volts are across each of these, um, you know that they are equivalent is going to be equal to 30 bolts here and thus you know that the current through this circuit is gonna be 120 faults to borrow. Excuse me. 100 30 OEMs up here is the equivalent resistance, not volts. We have 120 volts divided by 30 homes. So that's gonna be equal to 40 amps, which is an enormous, enormous current that we would have going on here. Okay, so we had Sorry, not 44.0. Still very large current. So we have our current that is four amps, and we want to find out the voltage drop across east of these, all we have to do is say that Delta V is equal to I. Times are so for the 10 home resistor that's going to be four amps multiplied by 10 homes. So that's going to be equal to 40. Well, it's And for the 20 we have four amps multiplied by 20 OEMs, which is going to be equal to 80 volts, and we can see that that adds up to 120. Now, the question becomes what are the voltages across each of these as a function of time? Well, we simply have to write down what we have, You know V 10 as a function of time is going to be equal to Delta V 10. So that's 40 volts multiplied by. Remember, this part comes from the source, so we don't have to do anything. Here and again, Omega is equal to two pi times 60 hertz. Meanwhile, the 20 is a function of time would be equal to 20 volts from not 2080 volts times cosine of omega times time. Okay, we could take this a step further and ask for currents, but we already know the total current, and we know the current will be the same through each. So it's it's really not going to matter very much. We know that I, as a function of time, is going to be equal to four amps multiplied by the cosine of omega T. So we have all of our pertinent equations for this circuit

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