Thermal Definition and 1000 Threads

Homework Statement [/B] Suppose the main water pipe breaks in a nuclear power plant, shutting off the water flow. If the control rods fall immediately into place, stopping the chain reaction, is there still a problem? Yes, because radioactivity continues to create lots of thermal energy. (A)...

If I know the temperatures of the two thermal reservoirs (one hot, one cold), the area of contact between each reservoir and the body, and the coefficients of conduction, it seems like I should be able to calculate the equilibrium temperature of the body, but I can't seem to figure out how.

Homework Statement A block with mass m = 1.46 kg is attached to a spring with spring constant k = 52.0 N/m and negligible mass. The coefficient of kinetic friction between the block and the table is µk = 0.349. The block is displaced from its equilibrium position to the left by 0.203 m...

I'm going to purchase a thermal cycler in the next few days. What qualities should I look for? How much should I spend? This is going to be a personal investment, and I'll have it in my home for periodic experiments at my own amusement.

Hi, please could someone explain why silver is a better conductor than, say, copper. Is it due to the fact that it has more conduction electrons than copper? I can't seem to find a definitive answer online. Thanks for any guidance offered.

1) PROBLEM: Task is to find the thermal conductivity of steel experimentally. I have conducted relevant experiments and I am trying to solve for the thermal conductivity (k) itself. My final however is ten times too large in size, and I am having trouble identifying where the error is coming...

I am doing a project on coal fired generator and I don't really know how my Alternator will work. I'm currently trying to use a 2 pole stator, 5 former making 1 pole, single phase alternator. These are the problems : how do I calculate/obtain the power rating of my alternator/ generator does the...

Homework Statement The temperature within the Earth's crust increases about 1.0 C∘ for each 30 m of depth. The thermal conductivity of the crust is 0.80 W/C∘⋅m. A)Determine the heat transferred from the interior to the surface for the entire Earth in 9.0h . B)Compare this heat to the amount of...

Homework Statement Suppose a car approaches a hill and has an initial speed of 116 km/h at the bottom of the hill. The driver takes her foot off of the gas pedal and allows the car to coast up the hill. Randomized Variablesvi = 116 km/h m = 780 kg h = 20.5 m a = 2.3 ° Part (a) If the car has...

guys i just wanted to know the formula by which i can calculate the thermal efficiency of a pass out steam turbine( a steam turbine with an extraction for process ) I've attached a simple diagram explaining my problem can anyone please help !

The thermal conductivity of most solids and liquids decreases with increasing temperature, but water is an anomaly because it actually increases with increasing temperature. I don't understand why though. I suppose it is something about the material itself and its hydrogen bonding, but not sure...

What is the relationship between heat and thermal energy?

Greetings While on an elk hunting trip in the mountains we awoke to roughly 2 feet of snow. Everyone wanted coffee and nobody had brought any conventional coffee tools. A cowboy boiled water in an aluminum pot just dumped coffee grounds in the water. Naturally a lot of those grounds floated...

Two 50g ice cubes are dropped into 200g of water in a glass. The water was initially at a temperature of 25°C, and the ice came directly from the freezer at -15°C. Neglect the heat capacity of the glass and any heat transfer to the environment. What is the final temperature of the drink when it...

Looking for some information on how a shrink fit collar actually works. I get the basic principle that you heat it, it expands, fit the collar, let it cool and it contracts and grips as a collar. However, if you heat a material am I right in saying that it expands in all direction. If this is...

hi, can somebody pls help me with the model i have appended to this post? it is a simple thermal mechanical contact problem but i don't know what is wrong about it and why there is some errors in it after computing. thanks

The information I am given is : a door has two steel layers both are .47 mm thick, the door itself is 725 mm by 1800mm. The question asks, how thick of a layer of wood (oak) would have to be put in the door to limit the heat loss to 740kJ per hour? Temp inside is 18C and outside is -20C All...

Fourier's law of thermal conduction states that \mathbf{j}=-k\nabla T, where \mathbf{j} is the heat flux. Integrating both sides of this equation over a closed surface gives the equation \frac{dQ}{dt}=-k\int \nabla T \cdot d\mathbf A. If there is a temperature discontinuity across this...

Homework Statement A metal rod of length 30 cm elongates 0.075 cm when heated from 00C to 1000C. a second rod of the same length but from an other metal elongates, at the same temperature difference, 0.045 cm. A third rod is made of 2 pieces from the 2 previous ones and of the same length...

Homework Statement A steel ring has a diameter of 75 mm at 20 deg C. how much must it be heated in order to mount on a brass shaft of dia 75.05 Then both are cooled. how must they be cooled so the ring will fall off? Homework Equations Thermal elongation coefficient of steel: 12E-6 Thermal...

To the best of my knowledge, thermal imaging (with a thermograph as the end results) is performed using arrays of thermopiles. This can become hugely expensive and is the reason fire services sometimes have trouble affording thermal imaging cameras. Snakes have heat sensitive ion channels...

Homework Statement A steel ruler is correct at 180c. when the temperature was 350c a distance of 28.85 m was measured between 2 points. what is the correct distance Homework Equations $$L=L_0(1-\alpha \Delta t)$$ The Attempt at a Solution $$1+12E-6 \cdot 17^0=1.000204$$ How many big...

Application: to measure the thermal strain of optical lens. Due to temperature variation the lens surface is expanding / contracting in radial direction with two extreme operating temperature. (-40C to +70C ) Optical lens is SF56A (CTE - 7.9*e-6 per Kelvin) What to do: I need to measure...

Homework Statement The pendulum of a clock is made of alumina. what is the relative elongation when cooled from 750 fahrenheit to 450? Homework Equations $$L=L_0(1-\alpha \Delta t)$$ From Fahrenheit to Celsius: $$t_f=\frac{9}{5}t_c+32^0$$ Coefficient of thermal elongation of alumina...

Homework Statement "see attachment" "q1" Homework Equations V=\frac{-A}{r}+\frac{B}{r^{10}} A=5*10^-30 B=8*10^-121 V=potential energy r=interatomic separation distance Coefficient of thermal expansion = \frac{change in L}{L*change in T} The Attempt at a Solution I have...

Hi everybody, I hope this is the appropriate place to post this question: A middle school physics book here in Sweden poses this question after giving a brief explanation of E = mc2: For you Swedish speakers here is the original text: So my answer is "Yes" to both since the additional...

Homework Statement One end of an insulated metal rod is maintained at 100∘C and the other end is maintained at 0.00 ∘C by an ice–water mixture. The rod has a length of 60.0cm and a cross-sectional area of 1.40cm2 . The heat conducted by the rod melts a mass of 7.15g of ice in a time of 15.0min...

Homework Statement Determine the thermal conductivity of a metal (assume linear heat distribution at steady-state, and well insulated), given, Thot = 96.8 Tcold = 29.5 There is also: 13.7 W being pumped in at one end. Water convecting heat away on the other end. Homework Equations...

I want to calculate the energy applied to a slab of steel with a temperature rise that varying with time (t) as - 13t + 5t^2 + 10* sin (3ωt) The energy applied to the system is calculated by mc (dT) equation where m mass of the slab c specific heat dT change in temperature

Homework Statement Many hot-water heating systems have a reservoir tank connected directly to the pipeline, so as to allow for expansion when the water becomes hot. The heating system of a house has 63.1 m of copper pipe whose inside radius is 7.69 x 10^-3 m. When the water and pipe are heated...

is it possible by any means to use a type of resonance wave to convert the vibrating motion of molecules in an object such that they start moving in the same direction causing the object to take off at high speed once the majority of the molecules are moving in the same direction? the...

Hi All, I would like to ask if what supplier's fabricate Low Coefficient of Thermal Expansion (CTE) glass tubing for Fiber Optics application. or What type of glass do we need in Low CTE? It will serve as the packaging for DWDM components. Hoping for your response. Thank you.

When two gases are mixed, if they are to be in thermal equilibrium, they must have the same average molecular speed. Why or why not?

im not talking about geothermal energy because my teacher gave us topics and mine is thermal energy and i did some research but i still don't get it if its renewable or nonrenewable because i got mixed answers when i researched about it. and are there any advantages for this energy? i think...

Hi everyone, i am trying to solve and program a non linear differential equation in MATLAB where thermal conductivity depends on temparature.I am trying it to solve by explicit finite difference method. the given equation is ∂2t/∂x2+∂2t/∂y2 *k(t)= -q (x,y) i have solved the equation taking...

Hi all I am very much a layman when it comes to Thermal Hydraulics and this may be a naive questions but here it goes... On the job, i use various codes to examine two phase flow in the core loop. Despite being vetted and validated numerous times over the course of many years (TRAC, RELAP...

How effective are the thermal management techniques in satellites? What kind thermal loads can they support? And I take it that while conduction can be used to transfer heat from one area of the satellite to another, that the ultimate limiting factor is the amount that it can dissipate as radiation?

Hello, I have modell in Ansoft Maxwell sumulate and need to transfer (import) it in Workbench ANSYS for the next step (Thermal analysis). How can i import it? Thank.

Homework Statement Here's a link to the pV-diagram I am using - http://session.masteringphysics.com/problemAsset/1396784/2/p16.7.jpg A heat engine takes 2.0 moles of an ideal gas through the reversible cycle abca, on the pV diagram shown in the figure. The path bc is an isothermal process...

I have just joined the forum so please be nice as I'm not an engineer. lol Thank you for any and all help. I wanted to tap the knowledge here because my brain hurts... I'd like a better understand of how to get the answer not just the answer if possible. I am designing a mechanical...

Homework Statement From a journal I read that the cobalt-based perovskite cathode usually has better ionic and electrical conduction but higher TEC compare to Maganite-based perovskite cathode. Because of the Co-O bond is weaker than Mn-O bond. e.g. Cobalt-based perovskite cathode...

Homework Statement If a copper kettle has a base of thickness 2.0mm and an area 3.0 x 10-2 m2 estimate the steady difference in temperature between the inner and outer surface of the base which must be maintained to enable enough heat too pass through so that the temperature of 1 kg of...

Thermal energy is momentum right? Is this a correct interpretation: If I slide an object across a frictional surface, the momentum will still be conserved, just not visibly (because it's now atomic momentum, called "thermal energy"). If yes, then, in all of these conservation of momentum...

Hi all, I know how if a statistical partition function is written as a path integral in imaginary time (Wick's rotation) the fluctuations around the mean-field represent thermal fluctuations. If the path integral is instead done in real time then fluctuations from the...

I have a simple question. If when mixing two liquids together the directions say mix 10.4 parts of hardner by weight for every 100 parts of resin and I want the final mixture to be 2.75lb, could I do the following? Mh = mass of hardener Mr = mass of resin Mh + Mr = 2.75lb Mh/Mr =...

I have to calculate the amount of thermal energy due to friction, it will be rolling friction if that makes a difference but i would like to know how (if possible) to calculate thermal energy due to friction in sliding friction as well. Thank you!

Homework Statement Homework Equations The Attempt at a Solution I don't know what is the difference between the change in entropy of the gas vs the thermal reservoir??

A man is running and chemical energy converts to thermal and kinetic. The output (thermal and kinetic ) has the same amount of energy as the input (chemical). But what does thermal and kinetic energy convert to?

Hello. In CGS unit electron thermal conductivity for plasma is expressed as \frac{n_{e}T_{e}}{m_{e}\upsilon_{e}}\Gamma_{1} [1] where \Gamma_{1} is the dimensionless transport coefficient. [2] You can also find similar expression in...

Homework Statement The cross section of ##^{59}Co## for capturing the thermal neutrons is ##2000 fm^2##. A ##10g##, thin paper of ##^{59}Co## is radiated for ##100 hours## in reactor with neutron flux ##2\cdot 10^{18} /m^2s##. Density of ##^{59}Co## is ##8.9g/cm^3##. Half life time of...