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03:38

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?

01:24

(II) According to a simplified model of a mammalian heart, at each pulse approximately 20 $g$ of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle?

03:04

Kai C.

(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?

04:15

Kathleen T.

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welcome to our fourth example video looking at power dissipated in a sea circuits. In this video, we're going to return to our RLC circuit. That is 50 OEMs, 10 micro ferrets and 15 Milly Henry's. And we're going to say that this circuit is drawing 100 million amps. If this circuit is drawing 100 million amps, I'd like to know what is, er m s going to be equal to now when I say it's drawing 100 million amps. We know that it's not drawing the same amount of current all the time. In fact, this is a measure of I r m s, not I maximum because we say it's drawing 100 million. That's an average current. Okay, So in order to solve for this is going to be most helpful to remember our impedance definition. Remember, before we had, eh? Not over. I maximum well here if we just write this as e r. M s over. I r m s. Remember, the only difference between these two numbers is a route to a factor of one over route to so that will cancel out. And so this is a perfectly good definition for impedance, which means, er m s is going to be equal to the impedance multiplied by I r M s now impedance isn't too difficult to calculate. Remember, it's equal to r squared minus omega l sorry. Plus omega L minus one over Omega Psi squared. So that's XL minus X c Quantity squared on DSO All we really need here is a frequency. If we were to say this is the standard 60 hertz circuit, we know that Omega is equal to two pi f and we would be able to find our impedance and thus find our e r m s as well. Okay, so this is kind of a neat trick, and it can show up in a lot of different problems where you can calculate the impedance easily and use it to find the E. R. M s or the I. R. M s and then proceed to solve for other issues.

Electromagnetic Waves