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Simon Fraser University

Hope College

University of Sheffield

01:24

Keshav S.

(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?

0:00

Aditya P.

(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?

Suman Saurav T.

00:56

Donald A.

I) How much tension must a rope withstand if it is used to accelerate a 1210-kg car horizontally along a frictionless surface at 1.20 m/s$^2$ ?

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Welcome to the second example video. Looking at our Elsie circuits in this video, we're going to consider the resistor we have here with the resistance of 100 homes and induct INTs of 10 million Henry and the capacitance of 10 Micro Farhad's. Given these numbers, we want to say, given a frequency equal to oscillating at 1000 hertz, what are the reactant for the inductive reactant, the capacitive reactant and the impedance going to be? These are all pretty much plug and chug sort of questions and answers. We know that Excel is equal to Omega Times. L X C is equal to one over Omega time. See and Z is equal to the square root of R squared plus x l minus X c squared. So we should do these two. First. Remember that Omega is equal to two pi f. So this is two pi times 1000 hurts times induct Ince's 10 million Henry That's 10 times 10 to the negative. Three. Henry and our capacitance will be one divided by two pi times 1000 hurts multiplied by 10 times 10 to the negative six fair ads. And once we have these numbers we plug these into Z along with our 100 homes and we'll be able to get our answer. Um, you should be able to see here why Z has our can end up being the dominant term in the impedance. Um, and many times will be if it's a significantly larger, uh, resist er than we have Excel or XY.

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