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Simon Fraser University
University of Sheffield
(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?
(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?
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Welcome to our second example video looking at sound and light in this video, we'll continue looking at sound by asking if we tap on a metal bar here and we put our our ear here a the end. Well, we hear the sound coming through the bar first, or the sound that's traveling through the air, both of which are created by tapping the end of the bar with a hammer or something. Okay, so we tap the end of the bar and now we're listening here. Do we hear the sound through metal or do we hear it through the air? Now, looking at this through the air, If we're at standard temperature, that's just 343 m per second. So we know that speed. We need to compare it to the speed of sound through the bar, for which we're going to have to resort to our original equation if we say the bar is made of steel steel, depending on the type, but it's approximately, has a density of 8050 kilograms per cubic meter and then are both module S B is approximately 163 times 10 to the nine. Pascal's okay, Yes. The units are passed out here. You can check that if you want. You can say we have Pascal's. Remember his Newton's kilograms meters per second squared, divided by meters squared and all of that divided by kilograms per meter cubed. So when we put this all together, what we're going to end up with is meters squared per second squared. We take the square root, we have meters per second. Okay, so we can take these numbers and type it in. Just find the speed of sound through the metal and which everyone is faster will be the sound that arrives first. Um, now you can do this with all sorts of things looking at sound, traveling through water or anything like that. Um, and you'll be able to do some interesting physics there, in particular as we move. See in the next unit, we'll get the physics of interference between these two types of sound
Thermal Properties of Matter
The First Law of Thermodynamics
Kinetic Theory Of Gases
The Second Law of Thermodynamics