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Rutgers, The State University of New Jersey
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Simon Fraser University
(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) 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?
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$^2$ ?
(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 physics, one of three in this first unit. We're going to be discussing some basics about matter. Of course, you're probably familiar with the various states of matter such as solids, liquids and gas is you probably even have pretty clear in your mind the differences between these three. That solids are rigid. They're characterized by strong bonds between atoms that hold the structure together has a fixed volume. Liquids, on the other hand, also have a fixed volume, but they're not rigid, so not rigid but still fixed volume. In fact, it's very difficult to get the volume of the liquid to change, though, as we'll talk about later on in this unit, you can do it by changing the temperature of the liquid. And with the gas is we have very weak bonds, if any, that are holding it together. And usually it's combined confined mawr to a particular volume because of physical constraints such as walls as opposed to some binding between the molecules themselves. So, looking at these three different states of matter, the gasses are the ones were particularly going to focus on in the upcoming unit on thermodynamics because gas is air what we often use to do work on our system or to have the system perform work back on its environment. Um, it's very convenient system for doing that. Occasionally we'll talk about liquids, which can be better for moving temperature around moving heat around than gasses are. Um, generally speaking, we will not be talking about solids in the upcoming units. Now for this first unit on matter, we're simply going to give a basic description of matter what the important variables are, how we describe them, how we handle them. Remember how to use Aava God rose number, which you may not have used since chemistry class and try to get a handle on how we can be prepared for our upcoming units on thermodynamics. Also, we'll talk about what makes up on ideal gas and start to get a preview of what some of the processes are that will really dive into in later units.
The First Law of Thermodynamics
Kinetic Theory Of Gases
The Second Law of Thermodynamics