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University of Michigan - Ann Arbor
(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?
(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?
(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?
(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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welcome to our third example video looking at sound and light in this video, we'll start looking at examples about light in particular. Um, we know that, as I said before, that light is an electromagnetic wave. It's an E and M wave. There's lots of different types of electromagnetic waves that don't all necessarily have the term light applied to them by non scientists. In particular, you've probably heard of things like X rays, UV light, infrared light. But then things such as radar, radio, TV, this is all electromagnetic radiation. So we're gonna look at what are the different frequencies of these different types of light? Okay, well, we know that they all travel at the same speed C three times, 10 to the eight meters per second. That's uniforms. Okay, well, what are the wavelengths of these things? It turns out that X rays tend to be on the order of about 0.0 one nanometers. Okay, so in other words, that's 10 to the negative 11 m. That's the wavelength of this electromagnetic radiation. A very short wavelength, incidentally, means a very high energy way. That's why X rays air so dangerous. UV light on the other hand is more on the order of nanometers. So it's something like tend to the negative 9 m and these air approximations there's, uh there's a range here that you ve sits in. That's less than X rays, but more than infrared. Now you ve again very energetic. That's why it burns visible light, which would sit right here. Is he on the order of hundreds of nanometers? Okay, so that's tend to the negative 7 m. Okay, so this is the range of light that we can see, in fact, and the whole electromagnetic spectrum we call it we can only V c a very small portion of it. Infrared as an infrared goggles is somewhat shorter than that. It goes from a large range of about one centimeter to approximately 1000 nanometers. Okay, that whole range is referred to as infrared. Meanwhile, radar operates on the order of centimeters. Okay, up 2 m and radio and TV is on the order of meters. Now you can't get much longer. For example, am radio is on the order of hundreds of meters long. Okay, well, for all of these, you can do the exercise where you calculate the frequency range of these same electromagnetic signals because we know that C is equal to F times lambda. So F is equal to see over Lambda so you can calculate these frequencies now. This is interesting because frequency is often how we refer to these things instead of talking about lambda because I've I've said Lambda changes depending on the material you go into. So it's much better to refer to these using frequency because it is consistent. Even if you pass into a material with this electromagnetic radiation so you can go through and calculate it. The range of values you'll find for frequency for radio in particular will probably look very familiar based on the numbers in your car, so it's kind of an interesting exercise to run through.
Thermal Properties of Matter
The First Law of Thermodynamics
Kinetic Theory Of Gases
The Second Law of Thermodynamics