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. A thermos for liquid helium. A physicist uses a cylindrical metal can 0.250 $\mathrm{m}$ high and 0.090 $\mathrm{m}$ in diameter to store liquid helium at $4.22 \mathrm{K} ;$ at that temperature the heat of vaporization of helium is $2.09 \times 10^{4} \mathrm{J} / \mathrm{kg} .$ Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 $\mathrm{K}$ , with vacuum between the can and the surrounding walls. How much helium is lost per hour? The emissivity of the metal can is 0.200 . The only heat transfer between the metal can and the surrounding walls is by radiation.

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5.78$g$

Physics 101 Mechanics

Chapter 14

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

Rutgers, The State University of New Jersey

Simon Fraser University

University of Winnipeg

McMaster University

Lectures

02:20

A solid, liquid, or gas is one of the three main states of matter. Solids have a definite shape and volume, and retain their shape when a force is applied to them. They are rigid, and do not flow to take on the shape of a container, but retain their own shape. Solids are held together by intermolecular forces, which are usually chemical bonds. Liquids have a free-flowing, continuous surface, and take the shape of a container. They flow to fill an available space. Their particles do not have a definite shape or volume, and they are not rigid. Gases have no definite shape or volume. They are not held together, and are not rigid. They flow to fill an available space. Gases are often described as being the state of matter with the lowest density.

03:25

The First Law of Thermodynamics is an expression of the principle of conservation of energy. The law states that the change in the internal energy of a closed system is equal to the amount of heat energy added to the system, minus the work done by the system on its surroundings. The total energy of a system can be subdivided and classified in various ways.

05:12

A physicist uses a cylindr…

06:41

03:18

01:42

(10 pts) You are building …

03:26

Liquid helium is stored at…

02:25

02:34

A cryogenic storage contai…

03:19

05:23

You come into lab one day …

Alright, guys, let's take a question. The question was asking us how much he in is lost per hour. Well, you want to determine almost Syrian loss per hour. When did you figure out how much he was burned? OK, and how much he was burned is related to the key currents question here, which is on a natural now he radiation in question. It's a you go to eight times eat and sigma tense t want to about hormones t to the power ace of surface area of the cylindrical model can he's ah imbecility. Sukma is the step on Constant. She wants the temporal liquid helium and a teacher is the temperature of liquid hydrogen. Okay, it seems that we got the value of B Ah very of Sigma America t one and t two. We don't have a very off surface area. So in order to determine the value off of the now he radiation waiting to find out the very of a surface area Well, that's the equation. While the service for the, uh, cylindrical surface area which is a equal to to buy our times r plus age, we know the highest age zero points with me was our here was the radius year. Well, no question the diameter was given, so the radio was just simply equal to the diameter by about two, which is zero point your name. You do I want to. And this will give us 0.45 years. So the surface area of the city vegetable matter is equal to two pi times 0.45 meter times 0.4 by media plus zero or in +25 meter. And this will give us the surface era over. The sensual matter is 0.83 meters square. So now we have the service area. Now I can determine the value for their now he radiation which is equal to such things ish equal to eat on. Sigmund has a test you want about four months to to to power for and we plugging value. We should get negative 2.33605 watt because you see any and was 4.2 to come into the power for minus 77.3 come into a power for so if a small way finest a large way give us a negative, but that's a matter. Because eventually, um, you can't. So I haven't show you Why? Okay, of the and now we have the he Kurds. Okay, It was just like the power. So in order to determine the heat, we just want. But by the time I remember, Waas can also become equal as Jew per second and we're talking Mullah, how much heating was lost per hour. So in one hour, there's 3600 seconds. Okay? And we know that we only we only need to determine the amount of heat. It was burned, so we can just make the positive he was connected. At this point, it's meaningless. Okay, so this will give us negative a negative 0.0 33 605 watts times 3600 seconds and this will be their positive. 0.0 336 Joe, five watts times 3600 seconds and it will give us 120 0.978 Que Well, he that is burning off the aging process. Okay, I remember final question later he off The heating was Cuban, which is to my own I Okay, so They were here before the vibration of the heating was to going all night times 10 to the power for Jew. Her Children's. Okay, so now we have Le heat. And now I have a later heat so we can determine the mass over. He didn't have his burned all we just am equal to Q. Do you have a All this will give us one in 20.978 Do you do I buy the lady? You were just two point or not. Center power forward. You per kilogram. Yeah, and this will give us you double check. Zero point 00 by 79 filled rooms. If we can vary the grams this week or two, five point 79 grabs. Okay. And that's the answer for this question. So about 507 9 grams. Oh, here, Ian. Who lost per hour. Okay. Thank you.

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