Temperature change Definition and 134 Threads

Homework Statement One method for cooling a gas is adiabatic throttling (Joule-Thomson Experiment). Another method is a reversible adiabatic expansion. Show that if the initial and final pressures are the same, the difference in temperature obtained by the second method is always higher. Hint...

Hi, I am a non technical person seeking some advise from experts. My question is like this - I get bread from the machine at 30 Deg. Celcius and store it at warehouse maintained at 25 Deg. Celcius along with some other bakery products. Our ware house has capacity to maintain 25 Deg. Celcius...

Homework Statement A smooth vertical tube having two different sections is open from both ends equipped with two pistons of different areas figure. Each piston slides within a respective tube section. One mole of ideal gas is enclosed between the pistons tied with a nonstretchable thread. The...

Hello, I just have a question. When a gaz expands against a piston (that is insulated), the system is doing work so W>0 and we know that the volume will increase and the pressure decrease. But what I want to know, is how about the temperature, I'd say that it will decrease since the...

Homework Statement Large beds of rock are used in some solar-heated homes to store heat. Assume that the specific heat of the rocks is 0.82 J/g-K. (a) Calculate the quantity of heat absorbed by 50.0 kg of rocks if their temperature increases by 12.0°C. (b) What temperature change would these...

Homework Statement What is the expected temperature change during one second of a polypropylene solid with mass 0.1 g at 105 degC to air at 20 degCHomework Equations heat transfer: Q= c m (T1-T0) where Q = amount of heat c = specific heat capacity = 1.8 J/g/K m = mass T1-T0 = change in...

Homework Statement Two metals of identical masses and initial temperatures are dropped into water which has a lower temperature than the metals. Both the water and the metals have the same mass. One metal has a higher heat capacity than the other metal. Which metal will change the...

Answer is in document. The problem does make sense to me because how can you compare three difference temperature scales, and this is why I am posting the problem to make sure I am correct. Basically what I did was assumed that the numbers at the bottom corresponded to absolute zero for the...

Ok, this question goes on a little further. I want to find the velocity of air moving from the equator to the poles due to the change in pressure caused by differing temperatures. I've found the flux density from the sun, so I have a value of flux (hope I am using the right term here -...

I am thinking about the adibatic compression when the gas gets back to Th from Tc... My question is how the p and V gets same as the initial pressure and temperature... Can you prove it?

Hello, Homework Statement The volume of the container in the attachment is given as V. The container is filled with a fluid whose heat capacity is C and whose viscosity decreases linearly with the temperature. The fluid is initially at temperature T0, and a pipe carries fluid at temperature...

Homework Statement An open-end cylinder with inner and outer diameters of 2a=30 and 2b= 60 mm, respectively, is subjected to a uniform temperatures change from 25 oC to 45 oC. Assuming the cylinder is rest on a table and free to move, determine the stress and the final dimensions (i.e. length...

Need help on "length change due to temperature change" question Homework Statement The tallest building in the world, according to some architectural standards, is the Taipei 101 in Taiwan, at a height of 1671 feet. Assume that this height was measured on a cool spring day when the...

1. Will the recorded temperature change for an exothermic reaction performed in a glass calorimeter be greater or less than that in a styrofoam coffee cup calorimeter? Assume glass to be a better conductor of heat than styrofoam. Please explain

Hi, I'm writing a small student-paper on heat pumps, and I'm not at the point where i explain the physics behind it. This is probably a silly question, but there's something I can't seem to understand about the throttling process. First off I get that the enthalpy is conserved through the...

I'm a bit confused as to what I do next with this problem. Consider the initial value problem \frac{dy}{dx} = a(y-b) where y(0) = y0 With a > 0, b = 0, it represents exponential growth, while a < 0, b = 0 gives exponential decay. With y = T, a = -k, k = TA and y0=T0 it gives Newton's Law of...

Homework Statement A container is divided into two parts by a thermally conducting wall. There are N atoms of a monatomic ideal gas on the left side, 2N on the right. The gas on the left is initially at absolute temperature 200K, the gas on the right at 500K. a. After thermal equilibrium...

Say you have a member of original length L and after a change in temperature T it changes in length to L'=L(1+αT). If we apply a force so that the length is returned back to L, the change in length is LαT and the strain is ε=LαT/L=αT. My question is why is the denominator in the strain L and...

Hi all: Sorry for the basic question but I have come across the formula ºC.min-1 in a paper which I believe is the formula for temperature change during one minute. The thing is that when I go to see how the authors used it, they have greater temperature change values than the ones a basic...

I have a problem in relation to the pressure in a closed piston and cylinder assembly, I know the compression ratio and want to work out the pressure when the volume is at its lowest, boyles law only seems to works if the temperature remains constant but I know that as the piston moves and the...

I know how to do heat capacity problems but i am unsure of how to do them when two materials are combined together. Here is the question. Any help would be great, thanks. A 5 kg pieces of low carbon steel at room temperature 25°C is placed into contact with a 300g piece of polyethylene at 180°C...

Homework Statement This is the last part of the question. So far have been made to derive: ## \mu _{\text{JK}}=\left(\frac{\partial T}{\partial P}\right)_H=-\frac{1}{C_P}\left(\frac{\partial H}{\partial P}\right)_T ## Then ##\left(\frac{\partial H}{\partial P}\right)_T=V - T...

Homework Statement An aluminum vessel hose mass is 178g contains 90g of water at 15.5°C. How many calories of heat are required to bring the water to a final temperature of 85°C? The specific heat of water is 1cal/g°C. Given: mAl=178g mH2O=90g T1=15.5°C T2=85°C cH2O=1cal/g°C...

Homework Statement A crate of fruit with a mass of 33.5kg and a specific heat capacity of 3650 J/kg*K slides 8.20m down a ramp inclined at an angle of 37.6 degrees below the horizontal. If an amount of heat equal to the magnitude of the work done by friction is absorbed by the crate of...

I am a bit confused by the definition of an isentropic process in the flow of an ideal gas. isentropic implies reversible & adiabatic. for a process to be reversible, there are no losses to friction (viscosity in this case), for a process to be adiabatic, there is no heat transfer with...

Alright guys, just looking for a point in the right direction for a tutorial question. GIVEN VALUES: Temperature change with increasing altitude: 0.0065 K/m Temp at sea level: 15ºC Pressure at sea level: 101.5 kPa FIND: Atmospheric pressure at 7500m. So what I've done is found the...

If I have two spheres of the same radius, they can still have different temperatures. However: What if the colder sphere is closer to the ideal of being a blackbody than the hotter sphere? http://en.wikipedia.org/wiki/Emissivity In an open system without internal energy generation, both...

1. A lead bullet with a mass of 0.03 kg traveling at 198 m/s strikes an armor plate and comes to a stop. If all the energy is converted to heat and absorbed by the bullet, what is the temperature change? 2. Q=KE=1/2mv^2; Q=CmΔT 3. Heat capacity (C) of lead = 130J/kg-°C, mass of...

Homework Statement Three portions of the same liquid are mixed in a container that prevents the exchange of heat with the environment. Portion A has a mass m and a temperature of 94.0 °C, portion B also has a mass m but a temperature of 78.0 °C, and portion C has a mass mC and a temperature...

Homework Statement a) One day, the temperature outside changed by 13.7 degrees on a Fahrenheit thermometer. By how much did the temperature change on a Celsius thermometer? Homework Equations F = (9/5)C + 32 The Attempt at a Solution F2 - F1 = 13.7 (9/5)C2 + 32 -(9/5)C1 + 32 = 13.7...

Homework Statement On February 16, 2007, paraglider Eva Wisnierska was caught in a freak thunderstorm over Australia and carried upward at a speed of about 3000 ft/min. The table below gives the temperature at various heights. Approximately how fast (in ◦F/min) was her ambient temperature...

hello, If I had a substance (k) and heated it from Temperature1 to Temperature2, for z seconds, is there any (simple) equation that would give me the temperature (x) of this substance at the end? (knowing, of course, the substance's specific heat(C)) I found that: Q(energy exchanged during...

Please Help! Thermodynamics, the ideal gas equation and temperature change Hi all! :smile: I'm new here! I hope my question gets answered because I'm really confused. Homework Statement An amount of 0.18 mol of an ideal gas is held in an insulated cylinder fitted with a piston...

If 5g grams Urea is dissolved in 10mL water, what is the temperature change? We are not given any constants as we are meant to research. Here is what I think I have to do: Calculate enthalpy of solution of urea. That is, enthalpy of hydration - lattice energy of urea. Then I multiply this by...

Homework Statement Heater dissipates 500W when applied potential diference is 110V and wire is 800C. How much power would it dissipate if the wire temperature were held at 200C? Homework Equations a=4.0e-4 p=V^2/R Rf=R0(1+a(T-T0) where R is resistance after temp change...

Homework Statement a) 100 cm3 of 0.1 mol/dm3 of hydrochloric acid was added to 100 cm3 of 0.1 mol/dm3 of sodium hydroxide and a rise in temperature of 4 degrees was observed. If 200 cm3 of 0.1 mol/dm3 of hydrochloric acid and 200 cm3 of 0.1 mol/dm3 of sodium hydroxide were used, the rise in...

I need to know how much the water temperature will change in a PVC pipe. I have a 1.2m long PVC pipe filled to 1 meter of water. The inside diameter is 12 inches and the outside diameter is 13 inches. I have a plastic end cap on the bottom and the pipe stands up vertically. I keep it in a 20...

According to Milankovitch cycles, is the Earth in a warming, stable, or cooling period ?

I have a pipe with a constant mass flow rate dm/dt of air being blown gently through which opens out into the atmosphere at both ends. At the middle point of this pipe it is heated at a constant rate dQ/dt. Assuming that the air is heated rapidly and all the heat is transferred to the gas is it...

A raindrop (mass=1.00g) is traveling at a speed of 40m/s when it hits the surface of 100g of water contained in a drinking glass. What is the change in temperature of the water in the glass if we assume that i)all the kinetic energy of the raindrop is converted to energy that changes the water's...

Homework Statement Two pounds of air contained in a cylinder expand without friction against a piston. The pressure on the back side of the piston is constant at 200 psia. The air initially occupies a volume of 0.5 ft3. What is the work done by the air in ft-lbf if the expansion continues until...

A tub of icy water at 0 degrees C hold 100 gallons. You put a 25 pound watermelon with a temperature of 29.4 degrees C. The tub is wrapped in blankets to avoid heat loss. What will be the final temperature of the watermelon, considering that a watermelon is mostly water?

Hi, I am working on simulating the change in temperature over time for the ground, given different material types. For instance, I'm considering an asphalt patch of ground say 10 square meters in area. For now, I'm willing to ignore atmospheric effects like rain, wind, and varying sun...

I am Not familiar with thermodynamics and stucked at work. Can anyone give an advice how I should approach to get an answer to the example question below please? If a 1000 cc of N2 gas cylinder is compressed at 100 cc/sec, what would be the gas temperature when the compression is stopped...

Please help: I need help to figure out the following: Given: An alluminum wall of thickness s. T outside wall, To T inside wall, Ti If the temperature changes on one side of the wall To, how long will it take until the the other side of the wall Ti reaches Tr, where To < Tr <Ti I...

Homework Statement One day you notice that the outside temperature increased by 29° F between your early morning jog and your lunch at noon. What is the corresponding change in temperature in each of the following scales? _____C _____K Homework Equations Tc = (5/9)(Tf - 32) T...

Homework Statement A thermos contains 150 cm3 of coffee at 85 oC. To cool the coffee, you drop two 11g ice cubes into the thermos. The ice cubesare initially at 0 oC and melt completely. What is the final temperature of the coffee? (Treat the coffee as if it were water) Homework...

Homework Statement A kid places a bottle of soda in a fridge and let's the temperature drop to 16K. What is the magnitude of its temperature change [Delta]T = 16 K in degrees Celsius? Homework Equations T=275K + deg cel The Attempt at a Solution 16-273 = -257 degree Celsius...

"Pounding an nail into wood makes the nail warmer. Consider a 5-g steel nail 6 cm long, and a hammer that exerts an average force of 600 N on it when driving the nail into a piece of wood. About how much hotter will the nail become? (The specific heat capacity of steel is 450 J/kgC.)" Here's...

in the following problem i know that ΔT=120 now the maximum deflection is 0.5mm so i looked for the total deflection had there been no restrictions ΔL(aluminium)=300*(23e-6*120)= 0.8280 ΔL(st steel)=250*(18e-6*120)= 0.5400 this is clearly more than the maximum deflection of 0.5-...