Number of results: 102,246
heat transfer
True or false (i) Steel is better conductor of heat than bricks. (ii) Radiations are ultrasonic waves. (iii) Black body is having emissivity 2. (iv) Natural convection do not need any external source for fluid flow. (v) Fins cause increase in rate of heat transfer
Wednesday, August 1, 2012 at 10:33am by siddique
Physics - Heat Transfer
I am trying to calculate heat transfer between two objects. The units are as follows: m1: 100 g t1: 10 degrees C spec heat 1: 1.00 cal/g degree C m2: 200 g t2: 90 degrees C spec heat 2: 0.2 cal/gm degree C I set Q1 = Q2 m1 x spec heat 1 x delta T1 = m2 x spec heat 2 x delta T2...
Thursday, December 6, 2012 at 10:40am by Brenda
physics-heat transfer
energy conscious homeowners often insulate their homes. one form of insulation is thick pads of loosely packed glass fibres.explain how these pads reduce heat transfer. how do thick curtains help reduce heat loss from the windows of a house? builders often insulate parts of ...
Friday, May 4, 2007 at 8:47am by Emma
4th grade science
Ultimately, all winds and weather patterns on Earth are the result of radiative heat transfer from the sun. The winds themselves are a form of convective heat transfer.
Saturday, November 7, 2009 at 8:35pm by drwls
Energy Transfer and Heat flow
1. What is entropy? 2.With every energy transfer, what form of energy is always released? I think 2 is Heat? not sure about 1
Sunday, March 24, 2013 at 12:19am by Anonymous
Physics
How is it possible for a fabric (textile) to conduct the 3 modes of heat transfer (conduction, convection and radiation?) i've been searching for a possible experiment to investigate this but no luck Anything with a higher temperature than its surroundings can move that ...
Sunday, April 1, 2007 at 10:50am by Pet
Energy Transfer and Heat flow
1. What is entropy? 2.With every energy transfer, what form of energy is always released? I think 2 is Heat?
Friday, March 22, 2013 at 9:33pm by Stephanie
8th Grade Space and Earth Science
Need help with these questions its so hard, here are the questions: How is heat transfer demonstratedin the Interior of the Earth? and How is heat transfer demonstrated in Earths oceans?
Tuesday, February 3, 2009 at 9:44pm by Sam
engineering
"Cladding" refers to the high-temperature-resistant material that surrounds the fuel pellets in a nuclear reactor fuel rod. I don't see how it has any application in home heat transfer. The analogy would be the walls of the house, that keep the heat in or out. A ...
Saturday, September 6, 2008 at 8:20am by drwls
Physics
(a) Calculate the rate of heat transfer to the substance using P = V^2/R. Multiply by 240 seonds for the number of Joules. That energy divided by the mass and 60 C is the specific heat (b) time required = (Mass)(Heat of fusion)/(Power) We will be happy to check your work
Sunday, May 10, 2009 at 5:46pm by drwls
thermodynamic
heat transfer generally means heat conduction or radiation. Thermodynamics adds to this the quantity of time, and the heat storage content of materials and matter.
Monday, June 20, 2011 at 2:12pm by bobpursley
chemistry
I can't read your equation but I now what you want. There are two equations you need to do this. The heat transfer WITHIN a phase is q = mass x specific heat in that phase x (Tfinal-Tinitial). The second equation you need is for heat transfer AT THE PHASE CHANGE. q = mass ...
Friday, November 2, 2012 at 4:30am by DrBob222
physics
Q=mC(Tf-Ti) heat transfer is equal to the mass of an object time the specific heat of the object times the difference between the final and initial temperatures.
Monday, April 6, 2009 at 8:18pm by sophie
Physics
Aluminum is melted during the recycling process. (a) How much heat must be transferred to each kilogram of aluminum to bring it to its melting point, 660 degrees C, from room temperature, 20 degrees C? (b) About how many cups of coffee could you make with this much heat?
Thursday, February 17, 2011 at 9:03pm by Heat transfer
physics
Refrigerators transfer heat from the contents inside (food and drinks) to the air outside. In addition, the electrical energy needed to run the refrigerator's compressor winds up as heat in the room. So what do you think the answer is?
Thursday, October 7, 2010 at 6:12am by drwls
physics
heat transfer is what the problem is... you need the specfic heat of water (how water reacts to the increase of heat) or dw(t)/dh (change of water temp with respect to heat added) etc etc its calorie/gram °C = 4.186 joule/gram °C make sure the units are the same and ...
Monday, November 22, 2010 at 5:20pm by matt
Physics
For the Newton's Law case, the heat loss rate rate is h*A(T - 20). and this equals M C dT/dt. M is the mass, C the specific heat and A is the area of the sphere(s). The differential equation can be solved for T(t) in terms of A, h, M and C. It results in an exponential ...
Sunday, March 14, 2010 at 5:29am by drwls
Science
What does an Electromagnetic wave transfer into?? It can transfer to heat, electical power, mechanical power, or light.
Sunday, November 26, 2006 at 7:27pm by Jordyn
physics
"An adiabatic process is a process in which no heat is transferred. This can happen if the process happens so quickly that there is no time to transfer heat, or if the system is very well insulated from its surroundings. " im not sure what the question means...either...
Monday, May 3, 2010 at 12:32am by lauren
Physics / Heat Transfer
How much heat must be removed from a 200 g block of copper to lower its temperature from 302 oF to 68 oF? Specific heat of copper: c = 0.092 kcal/(kg K) a. 2.4 kcal b. 2400 kcal c. 18.4 kcal d. 12 kcal e. 26 kcal
Wednesday, January 30, 2013 at 11:44am by John
physics
And what is your question? How much ice melts? The ball will transfer heat to melt the ice until it reaches a temperature of 0 C. The amount of heat transfered is M(iron)* C(iron) *95 C
Monday, January 17, 2011 at 4:34am by drwls
physics
A transfer of heat occurs with a pot of 8.0 kg of water that changes from 400 degrees kelvin to 320 degrees kelvin. How much heat is absorbed or given off?
Sunday, October 19, 2008 at 7:58pm by sammi
enthalpy change
The heat required to raise the beaker temperature will be 3/4 as much the second time, becasue of the delta-T rTIO. The heat required to heat the liquid will be higher by a factor (200/250)(2.43/0.67) = 2.90 Calculate the total heat required in the second case. The ratio (heat...
Sunday, October 10, 2010 at 6:30pm by drwls
thermodynamics
3.4 A heat engine operates between two heat reservoirs with temperatures of 560 and 280 K a) The heat engine itself has a temperature of 560 K during heat addition from the 560 K reservoir and a temperature of 280 K during heat rejection to the 280 K reservoir. The thermal ...
Friday, June 15, 2007 at 8:45am by jody
7th grade science (?) grammar
This is more of a grammar question. "Do you want to know about heat transfer?" It already an interrogative sentence. If you want to ask a question, it should be left in that form. You could, however, make it a declarative sentence such as "I would like to know ...
Sunday, November 22, 2009 at 6:57pm by drwls
Pysics
Equate the heat loss of the coin and the heat gain of the water. Heat transfer is M*C*(delta T) Mcoin*387*80 = 0.112*4186*8.58 The only unknown is Mcoin. Solve for it.
Monday, December 17, 2012 at 12:20pm by drwls
Physics
9. In which system is heat usually transferred from the cooler part to the warmer part? a. A stove as it heats up water. b. A refrigerator that is running. c. An electric fan that is running. d. None of the above, because it is impossible to transfer heat in this manner.
Monday, November 19, 2012 at 11:34am by S
physics
into which part of the fridge-freezer will the rate of heat transfer be greater?
Tuesday, September 27, 2011 at 11:04am by steve
Science
What is the main source of energy for the water cycle? What type of heat transfer does this provide? The sun is the main source driving it: Sun heats water, water evaporates. What type of heat transfer does it provide? I think that it is radiation, but I'm not completely ...
Tuesday, January 16, 2007 at 8:04pm by Emilie
HEAT TRANSFER
The door of a domestic refrigerates has an area of 1.7 m2 & it basically consists of a thin metal sheet with a 25 mm thick layer of insulation on the inside. The thermal conductivity of this insulation is 0.25 W / m-deg & heat transfer on each side of the door is 10 W...
Wednesday, August 1, 2012 at 10:26am by SIDDIQUE
Physics - Heat Transfer
aaaaaaaaahhhh. got it. you have to add them and set them equal to zero.
Thursday, December 6, 2012 at 10:40am by Brenda
Heat Transfer
Derive the general heat conduction equation in cylindrical coordinates by applying the first law to the volume element.
Sunday, February 26, 2012 at 10:56am by Farant
Physics
Heat energy is the energy associated with changes in internal energy. If no phase changes occur, the transfer of heat energy is accompanied by a change in?
Wednesday, June 8, 2011 at 8:20pm by Billy
Physics - Heat Transfer
Yes, you add them. One term is positive and the other is negative. The sum is zero.
Thursday, December 6, 2012 at 10:40am by drwls
physics
define black body, emissivity, solar constant in relation to heat transfer.
Monday, April 16, 2012 at 5:34pm by frank fred
Chemistry
How many grams of methane must be combusted to heat 1.05 of water from 24.0 to 89.0, assuming as a product and 100% efficiency in heat transfer?
Thursday, October 27, 2011 at 11:45pm by Collin
chemistry
How many grams of methane must be combusted to heat 1.05 of water from 24.0 to 89.0, assuming as a product and 100% efficiency in heat transfer?
Thursday, October 27, 2011 at 11:36pm by Collin
(SOL PS.7)(VBO 8.4.12)
DESIGN AN EXPERIMENT RELATE TO HEAT TRANSFER DESIGN AN INBESTIGATION FROM A TESTABLE QUESTION RELATED TO HEAT TRANSFER, OR SOUND (SOL PS.8)(VBO8.5.10 DESIGN AN EXPERIMENT FROM A TESTAN=BLE QUESTION RELATED TO SOUND
Thursday, March 12, 2009 at 3:19pm by tony
Chemistry HEAT OF FUSION
What is the final temperature, in oC, after a 15.0 g piece of ice, at 0oC, is placed in a styrofoam cup with 128 g of water initially at 74.0oC. Assume there is no transfer of heat to or from the surroundings. The specific heat of water = 4.184 JK-1g-1 The heat of fusion of ...
Thursday, October 6, 2011 at 1:35pm by tanner
physics - Heat transfer
A round scar of area 'A' is formed on the chest of a man of temperature 37C. The rate of heat radiated from this scar is 1% more than that from the remaining part of the body. What will be the excess temperature at this scar over other parts of the body?
Sunday, February 5, 2012 at 4:29am by uma
linguistics
Describe what contrastive analysis is and what transfer is(both positive transfer and negative transfer)?
Saturday, March 26, 2011 at 1:21pm by Monique
linguistics
Describe what contrastive analysis is and what transfer is(both positive transfer and negative transfer)?
Saturday, March 26, 2011 at 12:05pm by Monique
IPC
actually, Jai, it is a little more complicated then NO. Heat is being transfered, but at equal rates, so no net heat transfer occurs. This is the essence of thermal equilibrium.
Tuesday, May 3, 2011 at 10:06am by bobpursley
Physics
A person's body is covered with 1.4 m2 of wool clothing. The thickness of the wool is 1.3 10-3 m. The temperature at the outside surface of the wool is 14°C, and the skin temperature is 36°C. How much heat per second does the person lose due to conduction? You have...
Wednesday, April 18, 2007 at 6:09pm by papito
surface energy budget
I'm give the following data: Q*, QG, QH, QE for a 24-hour period, i'm required to plot these 4 data on the same graph, which I've already done. I'm also required to compute these 24 hours totals - transfer of sensible heat to the atmomsphere - transfer of ...
Monday, October 2, 2006 at 4:13pm by Fai
chemistry
Islands in the middle of the oceans (for example, Great Britain, Hawaii, Bermuda) tend to have more stable climates with smaller temperature fluctuations than regions of the same mass surrounded by land (for example, continents). Use your knowledge of heat energy, specific ...
Wednesday, May 15, 2013 at 9:38am by jader
chemistry
How much ice is required to cool a 15.0oz drink from 71 F to 34 F, if the heat capacity of the drink is 4.18 J/g*C ? (Assume that the heat transfer is 100% efficient.)
Tuesday, January 22, 2013 at 1:33pm by Jack
Chemistry
How much ice is required to cool a 15.0 oz drink from 71 F to 34F, if the heat capacity of the drink is 4.18 J/g*C? (Assume that the heat transfer is 100 % efficient.)
Tuesday, February 1, 2011 at 11:58pm by Jack
HEAT
arrangement of electrons? Nonsense. Heat is molecules in motion: vibrating, rotating, or moving. The warmer substances transfer energy to the "slower" colder substances in collisions when in contact.
Wednesday, December 8, 2010 at 10:23am by bobpursley
HELP URGENT Phyiics
To melt 446 g of ice and heat it to 65 C requires heat transfer to that ice of 446(333 + 65*4186) Set that number equal to the heat transferred from the steam mass M, which is M(2256 + 35*4186) Solve for the single unknown,M, in grams
Friday, April 12, 2013 at 5:44am by drwls
Chemistry II
Liquid sodium can be used as a heat transfer fluid. It's vapor pressure is 40.0 torr @ 633 degrees C and 400.0 torr @ 823 degreees C. Calculate it's heat vaporization.
Monday, September 5, 2011 at 2:28pm by Keith
Heat Transfer
I do not know
Wednesday, August 1, 2012 at 7:13am by Elijah
thermodynamics
Use the Carnot cycle H.C.O.P. and the required house heating rate to get the required heat transfer rate to ground water and the electrical input. Use Rankine temperatures for the HCOP. The mass flow rate of ground water can be computed from the water temperature drop and the ...
Sunday, January 16, 2011 at 10:30am by drwls
Heat Transfer
1.The physical significance of ....... is that it tells us how fast heat is propogated or it diffuses through a material during changes of temperature with time. 2. According to Krichoff's law in thermal equilibrium absorptivity is equal to ........ 3.In conduction heat ...
Wednesday, August 1, 2012 at 7:13am by Devi
chem
If the ice had not been dry, you would have been measuring the two things: heat to melt ice, and heat to heat up the surface melted water, making the calculations more complex Hot water is used to get a large change in temperature of the water, and to drive the final ...
Thursday, February 11, 2010 at 10:20am by bobpursley
CHEMISTRY
I know this question is already on here but the answer wasn't helpful to me. Liquid Sodium can be used as a heat transfer fluid. Its vapor pressure is 40.0 torr at 633 C and 400.0 torr at 823 C. Calculate its heat of vaporization.
Friday, December 9, 2011 at 6:16pm by THOMAS
Science (Chemistry)
Islands in the middle of the oceans (for example, Great Britain, Hawaii, Bermuda) tend to have more stable climates with smaller temperature fluctuations than regions of the same mass surrounded by land (for example, continents). Explain these facts by referring to heat energy...
Tuesday, April 10, 2012 at 4:22pm by Ricardo
Heat Transfer
Correct.
Wednesday, August 1, 2012 at 5:04am by MathMate
Chemistry
There are only two equations to remember in this heat transfer business with specific heat. 1. q= heat absorbed/releassed by phase change (melting/condensing) = mass x heat fusion for melting/freezing or heat vaporization for vaporization/condensing. 2. heat change by moving T...
Saturday, July 9, 2011 at 3:05pm by DrBob222
Heat Transfer
Fill In the Blanks: 1.The physical significance of ....... is that it tells us how fast heat is propogated or it diffuses through a material during changes of temperature with time. 2. According to Krichoff's law in thermal equilibrium absorptivity is equal to ........ 3....
Wednesday, August 1, 2012 at 5:04am by Dhilsath
physics
recall that for an energy transfer, q = -kA * dT / dx where q = rate of heat tranfer (in Watts) k = thermal conductivity (in W/m-K) dT = differential change in Temperature (in Celsius or in Kelvin) dx = differential change in position (x-direction) *note: this is negative ...
Thursday, April 14, 2011 at 8:27pm by Jai
physics--heat
a piece of glass is 6mm thick and the coefficient of thermal conductivity of this glass is K=0.75Wm^-1K^-1. if we add a 2nd identical piece of glass separated by an airgap of 5cm, the total thermal conduction will be reduced. what is the ratio of heat transfer by conduction ...
Saturday, March 14, 2009 at 2:40am by lisa
Chemistry
How do you determine the specific heat of a metal. You heat it to a specified temperature, transfer it to water at a known T and measure the rise in T of the water. Could you enclose the Na metal in a non-reactive metal container (one which you have already measured the mass ...
Monday, October 15, 2007 at 8:36pm by DrBob222
Heat Transfer
1.diffusion
Wednesday, August 1, 2012 at 5:04am by paper kro
physics
Which of the following is a True Statement? PLEASE EXPLAIN ANSWER A) It is possible for heat to flow spontaneously from a hot body to a cold one of from a cold one to a hot one, depending on whether or not the process is reversible or irreversible. B) It is impossible to ...
Monday, August 6, 2007 at 12:27am by stanbee
Physics
A steam engine's boiler completely converts 155 kg of water to steam. This process involves the transfer of 3.5 x 10^8 J by heat. If steam escaping a safety valve does 1.76 x 10^8 J of work against the outside atmosphere, what is the net internal energy of the water-steam ...
Wednesday, March 26, 2008 at 6:23pm by Lindsay
Chemistry
From the last problem you know how to handle the two different kinds of heat transfer; i.e., one kind at changing T when in just one state, the second when change state. Therefore, I will leave this to you except to point out the transitions that must be made. q1 = heat ...
Tuesday, April 13, 2010 at 7:32pm by DrBob222
chem
What would happen to the specific heat if some of the warm metal shot were lost during the transfer to the calorimeter? Answer a. It would not affect the calculated value of specific heat b. It would cause the calculated value of specific heat to be artificially high c. It ...
Sunday, October 24, 2010 at 11:33pm by kellie
Science
I hated heat transfer, so I can't help. Sorry.
Tuesday, January 16, 2007 at 8:04pm by Jade
Science, Heat Transfer
someone please help me!
Monday, January 14, 2013 at 7:36pm by Jade
Heat Transfer
Please help. its very urgentW
Wednesday, August 1, 2012 at 7:11am by Rajan
HEAT TRANSFER
Please help. its very urgentW
Wednesday, August 1, 2012 at 10:24am by Rajan
HEAT TRANSFER
Please help. its very urgentW
Wednesday, August 1, 2012 at 10:26am by Rajan
Heat Transfer
2.Emissivity 3.high 5.Electromagnetic
Wednesday, August 1, 2012 at 5:04am by Dhilsath
Chemistry
When ice melts, it absorbs 0.33 per gram.How much ice is required to cool a 12.0 drink from 72 to 37, if the heat capacity of the drink is 4.18 ? (Assume that the heat transfer is 100 efficient.)
Tuesday, February 1, 2011 at 11:58pm by Kate
Chemistry
When ice melts, it absorbs 0.33 per gram. How much ice is required to cool a 11.0 drink from 75 to 37, if the heat capacity of the drink is 4.18 ? (Assume that the heat transfer is 100 efficient.)
Friday, February 5, 2010 at 2:28am by Al
general science
When heat energy travelsby convection enrgy is transferred by the circulation of heated material is this tru? Yes. Convection heat transfer takes place as the result of circulation of a fluid between hot and cold regions.
Wednesday, July 4, 2007 at 3:37pm by Shannon
physics
A monatomic ideal gas (Cv = 3/2 R) undergoes an isothermal expansion at 300 K, as the volume increased from .05 m^3 to .15 m^3 The final pressure is 130kPa The heat transfer to the gas, in kJ, is closest to?
Sunday, April 15, 2012 at 2:38pm by Marcyel
HEAT TRANSFER
it is very urgent..............tell any one..............
Wednesday, August 1, 2012 at 10:26am by SIDDIQUE
Heat Transfer
Define Thermal diffusivity law?
Wednesday, August 1, 2012 at 4:59am by Dhilsath
thermodynamic
what is the difference between thermodynamics and heat transfer
Monday, June 20, 2011 at 2:12pm by mm
physical science
How do heat and work transfer energy?
Tuesday, April 29, 2008 at 12:04am by sam
Physics
Have you performed the experiment? What did you find out? The answer to c. may not be what you think, or what the teacher thinks. The energy of hand stirring is negligible compared to another source. Stirring affects convective heat transfer rates.
Tuesday, December 28, 2010 at 12:31pm by drwls
Physics - Unit Conversion
I am trying to calculate heat transfer between two objects. The units are as follows: mass: grams specific heat: cal/gm degree celsius temperature: degree celcius My numbers aren't working out and I know how to do the problem. So, what's the deal with the gm. Is that ...
Tuesday, December 4, 2012 at 2:51pm by Brenda
thermal energy/science
fluids transfer heat by convection
Tuesday, February 16, 2010 at 7:14pm by ali
physics
A combination of .403 kg of water at 45.1 C, .471 kg of aluminum at 41.1 C, and .307 kg of copper at 50.4 C is mixed in an insulated container and allowed to come to thermal equilibrium. Determine the final temperature of the mixture. Neglect any energy transfer to or from the...
Sunday, February 13, 2011 at 11:06pm by brandon
Chemistry I
When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 24.0 fluid ounce drink from 75°F to 35°F, if the heat capacity of the drink is 4.18 J/g·°C? (Assume that the heat transfer is 100% efficient.)
Wednesday, September 15, 2010 at 8:46pm by Robbie
Physics
The final volume will depend uipon whether the expansion is isothermal (no temperature change) or adiabatic (no heat transfer with the surroundings). In either case your answer is incorrect. You have just stated a pressure ratio, P2/P1.
Monday, March 12, 2012 at 9:04am by drwls
PHYSICS!!!HELP！！
You need the heat transfer coefficient of styrofoam. It is about .01 watts meters/deg call area of foam A = .016 m^2 call temperature difference across styrofoam = 35 - 0 = 35 deg C call thickness of foam t = 2*10^-3 m then heat gained through foam = (k A/t)((35-0) heat gain ...
Thursday, February 21, 2008 at 5:44pm by Damon
laser ablation of tissue
I've got news for you. This question is about the physics of ablation and heat transfer. It is not social studies. I do not understand the ¢J units of the laser ablation threshold temperature. Heat conduction can be ignored if the characteristic thermal conduction ...
Wednesday, June 15, 2011 at 11:50pm by drwls
science
Try some of the following links: http://search.yahoo.com/search?fr=mcafee&p=what+kind+of+heat+transfer+causes+earth%27s+major+wind+patterns+ Sra
Tuesday, March 15, 2011 at 10:42pm by SraJMcGin
Energy Transfer and Heat flow
ignore this please I refreshed by accident
Friday, March 22, 2013 at 9:33pm by Stephanie
Physical Science
The transfer of heat that takes place because of the density difference in fluids is
Monday, March 18, 2013 at 9:54am by L
HEAT TRANSFER
kyu bro paper krna hai kya
Wednesday, August 1, 2012 at 10:26am by Anonymous
chemistry
oops here. When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 12.0 fluid ounce drink from 75°F to 35°F, if the heat capacity of the drink is 4.18 J/g·°C? (Assume that the heat transfer is 100% efficient.)
Wednesday, September 15, 2010 at 5:00pm by Rebekah
Chemistry
In lab we conducted a calorimetry experiment with a peanut. We burned a half a peanut and placed it underneath a pop can with 50mL of water inside. One of our questions is why heat transfer to the pop can isn't accounted for when calculating heat generated and why it's...
Monday, April 19, 2010 at 6:27pm by Anonymous
science
Try some of the following links: http://search.yahoo.com/search?fr=mcafee&p=how+hydrogen+bonds+relate+to+the+transfer+of+heat+from+the+Equator+toward+earth%27s+poles Sra
Thursday, January 27, 2011 at 8:24am by SraJMcGin
Science, Heat Transfer
list 3 forms of radiation from the sun. how are they alike. how do they differ?
Monday, January 14, 2013 at 7:36pm by Jade
heat transfer
Explain the concept of critical thickness of insulation with expression
Friday, September 7, 2012 at 2:40am by paper kro
science
what kind of heat transfer causes earth's major wind patterns
Tuesday, March 15, 2011 at 10:42pm by molly
Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>
For Further Reading
