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University of Winnipeg
(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) 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$^2$ ?
Suman Saurav T.
(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 Unit A Lebanon oscillations in this video or the Rather instead of videos, we're going to be looking at motion that repeats itself. So, for example, classic oscillation is a pendulum. You could do this at home, just tie any massive object to a string of significantly less mass and displace it by some angle theta from its equilibrium point and then that it oscillate back and forth and back and forth and back and forth. You've probably seen motion like this before. Okay, so this is one of the most simple examples of oscillation. Another example that will consider here is one that you might have thought of before, which is a mass on a spring where we'll take some mass. And then again, massless spring here just like how we assumed a massless string over here and we're going to displace it some distance. Delta X, release it And assuming that it's on a surface that has zero friction, it will also oscillate back and forth, back and forth with a consistent amplitude. This sort of motion is known as an ocelot Torrey motion. So this is motion that repeats itself at a regular interval that interval, being known as T or the period. And we can describe that motion partially based on the period of it. Um, one other example of Oslo Torrey Motion that sometimes surprises people actually is circular motion. Think about this. If we have an object going around and around in a circle, and I were to shine a light on it from above and we were to watch the shadow don't here on the ground. But we would find is that the motion of the shadow would go to the left and then you go to the right. Then it go back to the left and then you go back to the right. And so when we take circular motion and project it into one dimension, we can actually find another example of oscillate Torrey motion. So we're gonna move on here and start talking about has specifically something known as simple harmonic motion. What describes it and how we can recognize it when we see it
Sound and Hearing
Thermal Properties of Matter
The First Law of Thermodynamics