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September 18, 2014

Search: Physics / Heat Transfer

Number of results: 60,982

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...
December 6, 2012 by Brenda

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
August 1, 2012 by siddique

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 ...
May 4, 2007 by Emma

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
March 24, 2013 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 energy...
April 1, 2007 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?
March 22, 2013 by Stephanie

Thermodynamics
A lawnmower tractor engine produces 18hp using 40kW of heat transfer from burning fuel. Find the thermal efficiency and the rate of heat transfer rejected to the ambient. I converted the power to 13.24kW then found the efficiency by dividing 13.24kW by 40kW but the answer is ...
June 12, 2013 by Kyle

heat transfer
a plane wall of thickness 10 cm and thermal conductivity of 25w/m degree centigrade has a volumetric heat generation of.3*10 to the power 16w/mque .the wall is insulated on one side & other side is exposed to fluid at90 degree temperature . determine maximum temperature in ...
July 24, 2013 by sushil

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 latent heat to the ...
October 2, 2006 by Fai

Physics -- check answers please
1. Which of the following best shows the transfer of heat by radiation? my answer: c 2. Which of the following best shows the transfer of heat by convection? my answer: b 3. Water has specific heat of 4200 J per kilogram per degree celsius. This means that 2 kg of water will ...
March 4, 2014 by Lisa

Science
which of the following illustrates conduction as a mode of heat transfer 1 point a microwave oven produces electromagnetic waves that transfer to the food in the form of head leaving a metal spoon in a bowl of hot soup will make the spoon at a well pasta rises and falls with ...
February 24, 2014 by Denna

Science
What does an Electromagnetic wave transfer into?? It can transfer to heat, electical power, mechanical power, or light.
November 26, 2006 by Jordyn

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
January 30, 2013 by John

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 / m2-deg...
August 1, 2012 by SIDDIQUE

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 ...
June 15, 2007 by jody

Physics -- check answers please
1. what is 67 K equivalent to in Celsius? answer: -206.15 C 2. what is 458.9 Celsius in K? answer: 732.05 3. heat is closely related to: a)temperature b)thermal energy c)force d)convection currents answer: b 4. What does a low efficiency score reveal about a home in terms of ...
March 2, 2014 by Lisa

Physics -- check answers please
1. what is 67 K equivalent to in Celsius? answer: -206.15 C 2. what is 458.9 Celsius in K? answer: 732.05 3. heat is closely related to: a)temperature b)thermal energy c)force d)convection currents answer: b 4. What does a low efficiency score reveal about a home in terms of ...
March 3, 2014 by Lisa

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?
October 19, 2008 by sammi

physics
the mass of the water is 131 kg and its initial temperature is 24.2C, how much energy must the water transfer to its surroundings in order to freeze completely? The specific heat of water is 4186 J/kgK, and the latent heat of fusion is 333 kJ/kg
August 5, 2014 by kb

physics
(a) How much heat (J) flows from 1.00 kg of water at 46.0C when it is placed in contact with 1.00 kg of 18C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable, taking the lowest ...
July 25, 2013 by Justin

physics
(a) How much heat (J) flows from 1.00 kg of water at 46.0C when it is placed in contact with 1.00 kg of 18C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable, taking the lowest ...
July 26, 2013 by Justin

physics
(a) How much heat (J) flows from 1.00 kg of water at 46.0C when it is placed in contact with 1.00 kg of 18C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable, taking the lowest ...
July 28, 2013 by Justin

physics
(a) How much heat flows from 1.00 kg of water at 46.0C when it is placed in contact with 1.00 kg of 18C water in reaching equilibrium? (b) What is the change in entropy due to this heat transfer? (c) How much work is made unavailable, taking the lowest temperature to be 18C?
July 28, 2013 by Justin

physics
(a) How much heat (J) flows from 1.00 kg of water at 46.0C when it is placed in contact with 1.00 kg of 18C water in reaching equilibrium? (b) What is the change(J/K) in entropy due to this heat transfer? (c) How much work (J) is made unavailable, taking the lowest ...
July 28, 2013 by Justin

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.
November 19, 2012 by S

physics
into which part of the fridge-freezer will the rate of heat transfer be greater?
September 27, 2011 by steve

physics
define black body, emissivity, solar constant in relation to heat transfer.
April 16, 2012 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?
October 27, 2011 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?
October 27, 2011 by Collin

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 sure.
January 16, 2007 by Emilie

Heat Transfer
Derive the general heat conduction equation in cylindrical coordinates by applying the first law to the volume element.
February 26, 2012 by Farant

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 ...
October 6, 2011 by tanner

Physics
what type of heat transfer does solar hot water heating use? (conduction, convection, radiation)
March 10, 2014 by Lisa

(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
March 12, 2009 by tony

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 14C, and the skin temperature is 36C. How much heat per second does the person lose due to conduction? You have a nice ...
April 18, 2007 by papito

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?
June 8, 2011 by Billy

linguistics
Describe what contrastive analysis is and what transfer is(both positive transfer and negative transfer)?
March 26, 2011 by Monique

linguistics
Describe what contrastive analysis is and what transfer is(both positive transfer and negative transfer)?
March 26, 2011 by Monique

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?
February 5, 2012 by uma

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.)
January 22, 2013 by Jack

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 ...
May 15, 2013 by jader

Material Science
A polystyrene ice chest contains 3 kg of ice at 0 degrees Celsius. Triangle H for melting = 3.34 x 10 to the 5 power J/kg p = 1000 kg/m cubed, CP =4190 J/ (kg K). Heat transfer is limited by conduction (k=0.06W/m K)) from the outside wall at 30 degrees Celsius. This means that...
August 24, 2013 by Joy

Heat Transfer
A 1 m square verticalplate is heated to 300 deg C and placed in room air at 25 Deg C. calculate the heat loss from the one side of the plate
March 27, 2014 by RHS

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.
September 5, 2011 by Keith

physics
Putting a lid on a boiling pot greatly reduces the heat transfer necessary to keep it boiling. Explain why
April 16, 2014 by Mohanad

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 ...
August 1, 2012 by Devi

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...
February 13, 2011 by brandon

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 ...
March 26, 2008 by Lindsay

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 ...
March 14, 2009 by lisa

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.
December 9, 2011 by THOMAS

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.In ...
August 1, 2012 by Dhilsath

Heat Transfer
A hollow tube having an inside diameter of 2.5 cm and a wall thickness of 0.4 mm is exposed to an environment at h=100 W/m2C and T =40C. What heat generation rate in the tube will produce a maximum tube temperature of 250C for k =24 W/mC?
March 4, 2014 by Ritesh

Heat Transfer
A hollow tube having an inside diameter of 2.5 cm and a wall thickness of 0.4 mm is exposed to an environment at h=100 W/m2C and T =40C. What heat generation rate in the tube will produce a maximum tube temperature of 250C for k =24 W/mC?
March 11, 2014 by RHS

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?
April 15, 2012 by Marcyel

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.)
February 5, 2010 by Al

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.)
February 1, 2011 by Kate

Material Science
A polystyrene ice chest contains 3 kg of ice at 0 degrees Celsius. Triangle H for melting = 3.34 x 10 to the 5 power J/kg p = 1000 kg/m cubed, CP =4190 J/ (kg K). Heat transfer is limited by conduction (k=0.06W/m K)) from the outside wall at 30 degrees Celsius. This means that...
August 24, 2013 by Joy

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 75F to 35F, if the heat capacity of the drink is 4.18 J/gC? (Assume that the heat transfer is 100% efficient.)
September 15, 2010 by Robbie

heat transfer
what are Biot & Fourier members?
July 24, 2013 by jigs

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 7.40 g of condensation forms on a glass containing water and 210 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
July 19, 2013 by Eric

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 7.40 g of condensation forms on a glass containing water and 210 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
July 21, 2013 by Alice

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 ...
August 6, 2007 by stanbee

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 gram mass...
December 4, 2012 by Brenda

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
July 20, 2013 by Alice

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
July 20, 2013 by Eric

physical science
How do heat and work transfer energy?
April 29, 2008 by sam

thermodynamic
what is the difference between thermodynamics and heat transfer
June 20, 2011 by mm

Heat Transfer
Define Thermal diffusivity law?
August 1, 2012 by Dhilsath

heat transfer
thermal conductivity of solids depends on ??
July 24, 2013 by jigs

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.
July 4, 2007 by Shannon

Chemistry
When ice melts, it absorbs 0.33 kJ/g. How much ice is required to cool a 11.0oz drink from 76F to 39F, if the heat capacity of the drink is 4.18J/gC ? (Assume that the heat transfer is 100% efficient.) I got 11 g, but I guess that's wrong...
April 4, 2013 by Jordann

physics
A heat transfer of 8.7 multiplied by 105 J is required to convert a block of ice at -12C to water at 12C. What was the mass of the block of ice?
November 22, 2008 by lyd

PLEASE HELP ME IN THIS PHYSICS PROBLEM
A heat transfer of 9.5 x 10^5 J is required to convert a block of ice at -15C to water at 15C. What is the mass of the block of ice?
January 14, 2013 by JOHN

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 ...
October 24, 2010 by kellie

HEAT TRANSFER
Compute the heat flux thoroughly a 10 cm thick brick wall (k= 0.69 W/m-deg) Which has temperature of 105 C & 10 C maintained on its two faces. How this heat flux would vary when 3cm thick layers of magnesia insulation is added on the inside & outside faces of the wall? Also ...
August 1, 2012 by SIDDIQUE

chemistry
capacity of the drink is 4.18 J/gC? (Assume that the heat transfer is 100% efficient.)
September 15, 2010 by Rebekah

heat transfer
Explain the concept of critical thickness of insulation with expression
September 7, 2012 by paper kro

heat transfer
Derive 3D general conduction equation for homogeneous material
July 24, 2013 by jigs

science
what kind of heat transfer causes earth's major wind patterns
March 15, 2011 by molly

Science, Heat Transfer
list 3 forms of radiation from the sun. how are they alike. how do they differ?
January 14, 2013 by Jade

Physical Science
The transfer of heat that takes place because of the density difference in fluids is
March 18, 2013 by L

chemistry
When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 12.0 fluid ounce drink from 75F to 35F, if the heat capacity of the drink is 4.18 J/gC? (Assume that the heat transfer is 100% efficient.) please explain realy realy well thanks:)
September 15, 2010 by Rebekah

Geography (Ms. Sue)
what role do wind and ocean currents play in climate? My answer: Wind and ocean currents help distribute the sun's heat from one part of the world to another through convention, the transfer of heat in the atmosphere by upward motion of the air.
September 2, 2013 by Anonymous

Physics
You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and Hf for lead is 2.04 × 104 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?
March 18, 2012 by Pat

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 ...
April 19, 2010 by Anonymous

Physics
Two equal-volume compartments of a box are joined by a thin wall as shown in the figure. The left compartment is filled with 0.050 mole of helium gas at 403 K, and the right compartment contains 0.025 mole of helium gas at 213 K. The right compartment also has a piston to ...
February 3, 2014 by Lyra

physics
Milk with a mass of 0.021 kg and a tempera- ture of 13C is added to 0.12 kg of coffee at 94C. What is the final temperature? Assume the specific heat capacities of the two liquids are the same as water, and disregard any energy transfer to the liquids surroundings. Answer ...
February 11, 2014 by Heather

thermodynamics
0.5 kg of saturated vapor is contained in a closed system with pressure of 10 bar is cooled at constant volume until pressure decreases to 5 bar. Determine heat transfer and sketch the process in a P-v and T-v diagram answer = -473.35 kJ(heat is transferred from system to ...
April 16, 2012 by shasha

Science
Explain the difference between conduction and convection heat transfer,and give an example of each.
January 25, 2009 by Jillian

4th grade science
What kind of heat transfer cause Earth's najor wind pattern?
November 7, 2009 by Damian

heat mass transfer
Eskimos make double walled houses of blocks of ice.
September 25, 2012 by chanchal

heat transfer
what is utility of extended surface? derive governing differential equation for fins
July 24, 2013 by jigs

Chemistry
In the equation Q = mc(deltaT), I learned that Q means heat transfer. Is it the heat transfer from the system to the surroundings, i.e. the system loses/absorbs heat or is it from the surroundings to the system? A couple of places on the Internet say that Q is the heat energy ...
March 4, 2013 by a Canadian

Physics
Help me understand this please You have a 2.00 kg block of lead. Lead melts at 327.5C. CPb = 130.0 , and Hf for lead is 2.04 10^4 J/kg. Say you start at room temperature (25.0C). How much heat must you transfer to melt all the lead?
March 25, 2014 by Me and I

7th grade science
how do you change the question do you want to know about heat transfer into a regular sentence?
November 22, 2009 by jamzin

science
how do hydrogen bonds relate to the transfer off heat from the equator towards the poles of earth
January 27, 2011 by lulu

Heat Transfer
Explain thermal conductivity & give its variation in case of solid, liquids and gases?
August 1, 2012 by Dhilsath

science
if the compressor in a refrigerator stopped working, how would its failure affect the heat transfer cycle?
January 17, 2013 by Taylor

sciene
if the compressor in a refrigerator stopped working, how would its failure affect the heat transfer cycle?
January 17, 2013 by Taylor

science
if the compressor in a refrigerator stopped working, how would its failure affect the heat transfer cycle?
January 17, 2013 by Taylor

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