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When air is heated, it ____ and can hold _____ water. a. sinks; lessb. sinks; morec. rises; lessd. rises; more...

Question

When air is heated, it ____ and can hold _____ water. a. sinks; lessb. sinks; morec. rises; lessd. rises; more

When air is heated, it ____ and can hold _____ water. a. sinks; less b. sinks; more c. rises; less d. rises; more



Answers

As the temperature of a diatomic gas increases, we expect its specific heat to
A. remain the same
B. increase
C. decrease

Okay, So back to the questions. Question 38 In the preceding problem, Supposed the block off would, with the bull high and dry, is floating in a tank. Water. Let's just draw that block work. It's here, floating in a tank of water and a steel ball on top. When the block is important, just inverted. Does the water level in attack decrease? Increase will stay the same. Well, we certainly showed that the volume of the wood was increased in the last question. But let's talk about what's going on in this world. What constitutes floating is really the best question for us. Floating happens when objects displaces water when its weight is equal to the weight of the fluid. Displaces saw it way to the fluid. Here we have a situation of floating and let me just make a quick note that f here will constitute fluid and s here will constitute soldier. Just so we get my convention well, from this weaken pretty much draw out. Wait. The fluid is the waste of solid. This gets us density of fluid. Phony. Move the fluid. Since she must be equal to dense do the soul it volume of the cellar times G. Well, of course, gravity plays no part in defining whether things float. That's on both sides of this equation, so we can now see proportionally the volume of this fluid. It's the volume in the cellar, most blood by a ratio of the densities. So it in the fluid. So a solid the volume V s and density RO s floats in a fluid of density Row F. The volume of the solid that is submerged is given by this so effectively the weight, the volume of the fluid displaced is the volume off. The submarine's stole it, and if that's the case, the volume of the submerged sell. It is equal to the volume off the fluid. The weight of the block is the same, whether it's erect or inverted, and so the mass will be supported by the water. That's the value of the water that must be displaced to Flint. The rock. The block will be the same when it's inverted, and as a result, the water level in the tank remains to say, and then it's time to choose from. The explanation is given to us sick about a very much stays the same. And, of course, our explanations betray the answer. Let's have a look. Explanation. Once it's inverting, the block makes the block float higher in the water, which lowers the water level in the tank. We just agreed that the water level states say two stays states that the same mass is supported by the water in either case, and therefore the amount of displaced water is the say Well, certainly that is convincing. Three says the inverted block floats lower in the water, which displaces more water and raises the level in the tank. Once again, we've done the maths, too. Has to be correct because it's the one that gives us the next best expert Nate. It's the one that explains what is going on.

Once again, we have a conceptual question for Question 79. The person float in a boat in a small backyard swimming pool inside the boat with the president's several blocks of wood. Suppose the person now throws the blocks of wood into the pool where they flipped. Does the boat flipped higher, lower or at the same level relative to water? Uh, heart One is very, very simple, really, because if we're talking about a boat floating in the water, my joining isn't really That's great. We consent and talk about it. We know that in a floating case, full weight is equal to the buoyancy force, and some water is displaced. So, of course, you floats up, throw some bricks off the boat on the weight of the water produces. This equation still has to pounce, so the buoyancy force will have to reduce. And the only way that that can happen, where we know that buoyancy force is equal to the dense to ofwater multiplied by volumes of Maris Most Blood Party. Subsequently, the volume has to go down and see the boat, but a floats higher in the water. And so it's a poppy, which asks does the water level in the pool increase decrease or ST ST? Well, as we're in a floating situation, the blocks of wood or displacing the same amount of water, whether they're in the boats are out of the birds due to this buoyancy force balancing Wait, So same volume displaced. So therefore, what's that level is, say, And we can see that once again just by effect that these lots of work have their buoyancy forces. There are waits that have to balance them. And so the volumes of mirrors to take same volume displaced most level states.

Yeah. So you asked about the formation of ice from water and were asked if it is accompanied by which of the following. So hey, an absorption of heat by the water be an increase in temperature D C. A decrease in volume and the removal of heat from the water E decrease in temperature. So, um, as water turns to ice, basically, you see that when its liquid, it drops the temperature. And then when the as it's forming ice from the we wind up at a constant temperature. Then when it's all ice, it will start to drop again. So we know that there is no decrease in temperature or, um, increase in temperature so B and E have to be are not correct. We also know that when water form turns to ice, they actually have an increase in the volume. So she is correct. Five countries, um and so we have an absorption of heat. Well, that isn't the case, because basically, as the water as the water turns to ice, we actually have to be, um, we have to be removing heat. So as we cool the water down, we're removing heat. Even though it's not the constant temperature as it's turning the water. We're still removing heat. And then as it goes, um, as it drops as it all turns to ice, then it stopped in temperature. We continue to remove heat. So during this whole process, although the temperature is, um, wind up decreasing than being constant, then decrease again. We're removing heat through the whole process. Um, S O. The answer is, um let's see, here D is so there's a removal. He must be removed from the molecules. Um, and then they let lose energy. So basically, you need you need to take energy away for to get it to change phase from a liquid to a solid, and that the energy that you need to do that is called the latent heat of fusion. Obviously, this is, you know, per per, um per kilogram or per mass of the amount of kill you you have. So if you think about the energy, you know if if you're if you're looking at the energy, um, you know there's a certain amount of energy that needs to be absorbed, um, or removed from the water in this region when it's at a constant temperature in order to get it to solidify into ice

So wait Give us defined in part a The foods we are forced to the wait off surrounding air ws So let's do that We are in force. Is the mass or the weight off gas this place or the media displaced So density times the volume times the gravity So that is about the cool one. So the amount of cold air replaced is and its weight gives you the blonde forced weight off hot air So I should give you give hot air here is throw each region since the question asks us to find the alien force to the weight off a guest and we will assume that volume is saying. But we will assume that the density falls as one over temperature. That is, the volume grows as linearly as temperature so cold. So this will be just t h divided by T. C T H is 15 cents yourself 50 plus 2 73 divided by 20 leads to 70. So let's on this. It is 1.1 now to solve the party part B asks us to find energy needed to cause one meter of air to go from when me to kill off where to go from 20 to 50 degrees Celsius. So yes, so we can simply use the formula. M c d Delta t No masses density times the volume because we are given the volume density off air is 1.29 kilograms. For me to kill you, volume is one meter cube. See, that is specific. Heat is 7 20 Jews for kilogram full degree Celsius. So furtively Kelvin and change in temperature. Here is just 30 and I stood this calculation so two times 7 20 times 1.2 night. So the answer here is 27864 Since we want answer in just three significant digits, we will keep answer in three significant digits. The 2.79 times 10 powerful Jews and the parties or gravitational potential Energy is gained by this volume if it rises by one meter. So let's find that out. See changing energy. Let's not use cue here. Let's use work MGH again Masses 1.29 tires William one times the gravity, which is 9.8 times of change in height, which is one meter. So let's do this calculation 1.29 times nine, which is your quarter? 12.642 So since we weren't talking only three significant digits, this will be 1.26 times 10 power one juice. Now compare it with this heat. This heat is very smart. That's what they will not be any significant cooling off the air. So let's actually find that out. Delta T is equal to work, divided by M. C. So that is 12.6 divided by mass, off 1.29 times 7 20 Special ticket. So also here is 0.13 which is not significant. Thank you for listening.


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