Wednesday
April 23, 2014

Search: thermal pollution and artificial eutrophication

Number of results: 906

physics
what is thermal equilibrim, and what is thermal energy? what are fluid molecules? does convectin involve the movement of matter in a circular manner only? thermal equilibrium: no net flow of heat in or out. thermal energy: The sum of all the interanal stored energy in the ...
Monday, January 29, 2007 at 3:15am by minerva

Physics
The rate at which the materisl can transfer heat to your hand is proportional to k/(density*C), where k is the thermal conductivity. This parameter is called the "thermal diffusivity". The steel hood has the highest thermal diffusivity. Glass is the lowest.
Saturday, December 10, 2011 at 5:38pm by drwls

Chemistry
There is certainly a difference in thermal conductivity between liquids. Hydrogen bonded liquids (water, alcohols) have a larger thermal conductivity than a hydrocarbon for example. The liquids with lowest thermal conductivities are the freons which are used as refridgerants.
Thursday, October 30, 2008 at 9:57pm by Dr Russ

physics
It loses the same amount of heat. Now temperature change depends on the thermal capacity, the one with the greater thermal capacity will lose less temperature. Heat= thermal capacity*deltatemp
Wednesday, January 30, 2008 at 7:00pm by bobpursley

Physics
An automobile is brought to a stop by applying friction brakes to the wheels. The brakes get hot; their thermal energy is increased. The decrease in kinetic of the car is equal to the increase in thermal energy of the brakes. According to the first law of thermodynamics, the ...
Thursday, February 28, 2013 at 7:57pm by Brandi

math
A) Since the masses are equal, there is more thermal energy in the hotter water. B) Since they are at the same temperature, there is more total thermal energy in the larger mass, 500 g. Temperature measures thermal energy per mass
Monday, December 19, 2011 at 12:02am by drwls

physics--heat
what is W1 and K1? so is Wair=thermal conductivity of air gap and Kair=thermal conductivity of glass?
Saturday, March 14, 2009 at 2:40am by lisa

Chemistry
i tried googling it but i got thermal changes of ... would thermal change be temperature change?
Thursday, June 10, 2010 at 11:37pm by Amy~

scientist
Solar cells convert what type of energy into electrical energy? chemical electromagnetic nuclear thermal Can someone plaese help I believe thermal
Monday, April 9, 2012 at 9:37pm by kevin

science
Turn an incandescent lamp on and off quickly while you are standing near it. You feel its thermal energy but find when you touch the bulb that it is not hot. why you felt thermal energy from it.
Wednesday, January 30, 2008 at 7:46pm by Ashton

science
Thermal energy is different from temperature because thermal energy depends on the _____.
Wednesday, April 18, 2012 at 3:04pm by john

phys. science
when most matter is heated it expands right? & doesnt water expand when it is heated? & what is the diff. b/w thermal conductor and thermal insulator? & in which direction will heat spontaneously flow?
Thursday, May 15, 2008 at 7:43pm by leann

physics
How do we compensate for thermal expansion /contraction in the construction of railway tracks? How do we compensate for thermal expansion /contraction in the construction of steel bridges? How do we compensate for thermal expansion /contraction in the construction of metal ...
Tuesday, October 4, 2011 at 11:53am by anil

Physics
A fossil-fuel power plant that generates 1000MW of electrical power discharges 1600MJ per second as waste heat into the river. A)At what rate(in MW) is thermal energy obtained fromt the burning of coal? B)What is the thermal efficiency(power output/heat input) of the plant? C...
Wednesday, May 4, 2011 at 1:35pm by Devon

Physics
Area=o.oo2m temperature difference=150oK thermal conductivity=0.84Js-1m-1K-1 thickness=0.03m time=60s ^=delta thermal conductivity=K A^T t\L 0.84*0.03*150*60\0.002=113400J
Monday, May 2, 2011 at 10:09pm by sam

Physics
Thermal energy question A 40.0kg sample of concrete has 10% zinc impurity (by mass). If 6.0x10^4J of thermal energy is added to the sample, determine the change in temperature.
Thursday, January 2, 2014 at 3:39pm by Sandara

thermal Energy
Suppose a bar 1 m long expands .5 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated? If each one meter expands a half centimeter, then one hundred meters will expand 100*.5cm. Think on that. NO I DONT UNDRERSTAND WHAT THAT MENS...
Friday, June 17, 2005 at 3:14pm by Jarrad Schomaker

Physics
Forget the factor of three. They have given you beta (the volume thermal expansion coefficient), not alpha (the linear thermal expansion coefficient). Delta V = 5.81*10^-4*43*21.5 = 0.54 gallons
Wednesday, April 27, 2011 at 1:47am by drwls

science
Thermostats have a thermal device that moves in response to temperature, often these are bimetallic metals. This expansion controls switch points. Another type of switch is electronic, which has a thermal detector which causes a current which is amplified and triggers any ...
Saturday, January 24, 2009 at 5:15pm by bobpursley

chemistry
Assuming same molecular size, the diffusion coefficient scales with the random speed of thermal motion. There is also an inverse dependence upon pressure. Oxygen's thermal speed is sqrt16 = 4 times less than H2. Because molecules are not rigid spheres, this is an approximation.
Friday, August 5, 2011 at 7:41am by drwls

ap chemistry
a battery operated tool, such as a cordless drill, converts... a.) electrostatic energy to chemical potential energy b.) mechanical energy to thermal energy c.) thermal energy to mechanical energy d.) thermal energy to chemical potential energy e.) chemical potential energy to...
Friday, September 24, 2010 at 9:45pm by Sarah

phys
Thermal power is rate of thermal energy. P = (thermal energy) / (time) = Q/t = = mcΔT / t = (m/t) (c) (ΔT) Here m/t = 4.910^6 kg/s c = specific heat of water = 4186 J/kgC ΔT = change in the temperature = 0.50 C Substituting all these values in the ...
Monday, April 30, 2012 at 1:08am by Elena

phys
Thermal power is rate of thermal energy. P = (thermal energy) / (time) = Q/t = = mcΔT / t = (m/t) (c) (ΔT) Here m/t = 4.910^6 kg/s c = specific heat of water = 4186 J/kgC ΔT = change in the temperature = 0.50 C Substituting all these values in the ...
Monday, April 30, 2012 at 1:08am by Elena

physics
Stainless steel is a poor conductor of heat. To spread the heat evenly across the bottom, another metal is needed. On the second, they do. The universe is cooling. On the third, the temperature stablizes when thermal radiation radiating is equal to thermal radiation coming in.
Wednesday, January 30, 2008 at 6:40pm by bobpursley

scientist
Electromagnetic (light, in this case). This type of energy can be converted to electrical more efficiently than thermal energy can. You can also think of it as thermal energy conversion from a very hot (5800 K) body (the sun), and apply the Carnot efficiency limit (about 97%).
Monday, April 9, 2012 at 9:37pm by drwls

physics repost
Increasing temperature will indeed increase the thermal energy. However, the increase in thermal energy is not (in general) only an increase in average kinetic energy.
Friday, April 4, 2008 at 12:05pm by Count Iblis

physics
With each cycle, a 2650-W engine extracts 2330 J from a thermal reservoir at 85.1C and expels 1840 J into a thermal reservoir at 20.9C. a) What is the work done for each cycle? b) What is the engine's efficiency? c) How much time does each cycle take?
Sunday, January 1, 2012 at 9:39am by maria

Physics
In each cycle of its operation, a heat engine expels 6,100 J of energy and performs 1,300 J of mechanical work. (a) How much thermal energy must be added to the engine in each cycle? (J) (b) Find the thermal efficiency of the engine. (%)
Monday, November 26, 2012 at 4:27pm by Sam

Thermal Physics
Two cars collide head on while each is travelling at 80 km/hr. Suppose all of their kinetic energy is transformed into thermal energy. What is the temperature increase of each car? [You may assume that the specific heat capacity of each car is that of iron, 449 J kg-1K-1.]
Friday, May 20, 2011 at 10:22am by Francesca

thermal physics
A sphere of radius 0.583 m, temperature 39.4C, and emissivity 0.983 is located in an environment of temperature 85.1C. At what rate does the sphere (a) emit and (b) absorb thermal radiation? (c) What is the sphere's net rate of energy exchange?
Wednesday, April 1, 2009 at 8:18pm by sweety

PHYSICS DUE SOON
In each cycle of its operation, a heat engine expels 6,100 J of energy and performs 1,300 J of mechanical work. (a) How much thermal energy must be added to the engine in each cycle?_____J (b) Find the thermal efficiency of the engine.____%
Thursday, November 29, 2012 at 3:47pm by Ame

Science
less thermal energy because, thermal energy of water depends on the volume. more volume means that more capacity for storing heat energy.
Tuesday, May 7, 2013 at 9:44pm by bonjo

chemistry
in a exothermic reaction ________ energy is converted to ________ energy. A. potential, kenetic B. kinetic, potential C. thermal, potential D. heat, thermal
Saturday, March 5, 2011 at 2:53pm by emily

chemistry
I agree with you , the answers stink. chemcical potential energy is released to become thermal energy, however,under the KMT, thermal energy is movement of molecules, or in 4th grade terms, kinetic. A is the best of the lot, however, it would not explain how light or heat is ...
Saturday, March 5, 2011 at 2:53pm by bobpursley

Physics
A 500 g glass beaker is in thermal equilibrium with 100 ml of 20 Degrees celsius water in it. If a 5 g sample of copper is placed into the water and the system is allowed to come into thermal equilibrium, what will the final temperature of the system be? (assuming no heat loss...
Thursday, January 5, 2012 at 8:16pm by Rachel

science
Explain the relationship of the temperature of a substance during a change of state and the amount of thermal energy.Be sure to include information regarding change of state, absorption and realising of energy, and graph of thermal energy versus the temperature
Thursday, September 6, 2007 at 6:14pm by bah

physcis
Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030 m^2 thermal window at a temperature of 30 degree C. If the seals surroundings are a frosty -10 degree C, what is the net ...
Tuesday, April 6, 2010 at 11:30am by Kidda

Materials
What is the thermal expansion of brass per deg F? http://www.engineeringtoolbox.com/thermal-expansion-metals-d_859.html http://www.engineeringtoolbox.com/thermal-expansion-metals-d_859.html
Tuesday, July 3, 2007 at 3:17pm by Tom

Physics
An immersion heater of resistance R converts electrical energy into thermal energy that is transferred to the liquid in which the heater is immersed. If the current in the heater is I, the thermal energy transferred to the liquid in time t is ? The answer is I^2RT, but I don't...
Saturday, February 19, 2011 at 8:17pm by Amanda S.

Physics
Thermal resistance is series can be added. The SI units are, presumably, Watts/*m^2^*degC) Total thermal resistance = 0.033 + 2.97 + 0.33 = 3.33 W/m^2*C Multiply that by tha area (1 m^2) and 30 C for the heat loss rate in Watts. It looks like 100 Watts. For a large house, that...
Friday, October 8, 2010 at 7:50pm by drwls

physic
Thermal expansion equals stress compression. Solve for the stress, sigma. L*(alpha)*(delta T) = (sigma/E)*L sigma = E*(alpha)*(deltaT) E is Young's modulus for steel delta T = 38.9 C alpha is the linear coefficient of thermal expansionm of styel L cancels out and is not needed.
Monday, April 11, 2011 at 8:00am by drwls

Physics
Set the (negative) thermal expansion equal per unit length to the strain due to tension. alpha*(delta T) = (F/A)/Y Y = (F/A)/[(delta T)*alpha] Y is Young's modulus A is the cross sectional area, 1.5*10^-5 m^2 delta T = 41 C F = 1200 N alpha = 2.1*10^-5 C^-1 is the coefficient ...
Friday, April 11, 2008 at 4:50am by drwls

physics--heat
Add the thermal resistances of the two glass slabs and the air gap. The conductance is the reciprocal of the resistance. Are you sure the air gap is 6 cm and not 6 mm? With a gap that large, you are likely to get convection currents in the gap. Thermal Resistance of one slab ...
Saturday, March 14, 2009 at 2:40am by drwls

Physics
The volume of the pipe is pi R^2 L = 1.93*10^-2 m^2 = 19.3 liters Calculate how much that volume of water increases when being heated from 20 to 75 C. You will need the bulk thermal expansion coefficient of water. It varies a lot from 20 to 75 C, but a suitable mean value is 4...
Saturday, April 5, 2008 at 3:29am by drwls

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #4: What is the increase in thermal energy to a 2000 kg bus and its ...
Thursday, March 7, 2013 at 8:23am by Anna

Technology in Health Services
Here's another, although I'm not sure that "high crime" fits its profile! http://en.wikipedia.org/wiki/Thermal%2C_California
Saturday, April 5, 2008 at 10:26am by Writeacher

Physics
The pipe shortens. That is a -55 C temperature change. length change = L*alpha*(delta T) -(65 m)*(thermal expansion coefficient of steel)* (55 C) Look up the thermal expansion coefficient of steel for that temperature range. It is about 12*10^-6 per degree C
Sunday, April 6, 2008 at 10:43pm by drwls

Science
1- When a solid like carbon dioxide changes directly into a gas without becoming a liquid its a____________. 2-what are the states of matter in order, from the greatest thermal energy to the lest thermal energy__________, ____________,and ___________. 3- when a gas changes ...
Wednesday, April 1, 2009 at 8:32pm by Jennifer

physics
If you are sitting at home in your room, the walls please help me pick one best answer of the followings. 1. emit visible light with a peak wavelength close to 0.5 micrometer. 2. emit thermal radiation in the near infrared with a peak wavelength close to 1 micrometer. 3. emit ...
Tuesday, October 4, 2011 at 12:22am by ice cream

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

heat transfer
The addition of insulation in some cases may reduce thermal resistance due to the reduction in convective thermal resistance because of increase in surface area as in case of cylinder and sphere. It may be shown that the thermal resistance actually decreases and then increases...
Friday, September 7, 2012 at 2:40am by paper kro

Physics/chemistry
so is it something like this The flight path of a Hot Air Balloon is ultimately controlled by thermal energy regulation. This regulation of the heat gives the pilot a precise control of the altitude of the balloon, which in turn provides for any lateral control that might be ...
Saturday, February 16, 2008 at 4:23pm by anum

physics
A brick wall with a thermal emissivity of 0.8 is heated by the sun all day and is at a temperature of 25 C in early evening. A pedestrian walking past the wall feels its warmth radiating in to the cool evening air. The wall has surface area of 5m^2. What is the total out put ...
Tuesday, January 3, 2012 at 8:23pm by sand

physics
Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at 20C, whereas system B contains 200 kJ of thermal energy at 50C. Now the systems are brought into contact with each other. Determine the direction of any heat transfer between the two systems.
Thursday, October 7, 2010 at 1:30am by sandhya

thermodynamics
Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at 20C, whereas system B contains 200 kJ of thermal energy at 50C. Now the systems are brought into contact with each other. Determine the direction of any heat transfer between the two systems
Monday, August 8, 2011 at 2:44pm by Yash

thermodynamics
Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at 20C, whereas system B contains 200 kJ of thermal energy at 50C. Now the systems are brought into contact with each other. Determine the direction of any heat transfer between the two systems
Monday, August 8, 2011 at 2:44pm by ahmed

college physics
If you are sitting at home in your room, the walls 1. emit visible light with a peak wavelength close to 0.5 micrometer. 2. emit thermal radiation in the near infrared with a peak wavelength close to 1 micrometer. 3. emit thermal radiation in the mid-infrared with a peak ...
Tuesday, October 4, 2011 at 12:36am by ice cream

Physics
Here, CSA of first rod = C CSA of first rod = D Thermal Conductivity of first wire = a Thermal Conductivity of 2nd wire = b Let the length of the two wires be L Temperature difference at the ends be ∆T Now by law thermal conduction for first conductor ∆Q/∆t...
Monday, June 3, 2013 at 4:01am by jai

physics
a metal cylinder containing water at 60ged C, has a thickness of 4mm.And the thermal conductivity 400W per m per K. it is lagged by felt of thickness 2mm and thermal conductivity 0.002W per m per K. the room temperature is 10deg C.Find the temperature gradient g for for the ...
Tuesday, May 1, 2012 at 8:42am by ridhi

science
i need help finding some household items that have some of the following forms of energy: radiant, chemical, nuclear, electrical, acoustic, thermal, and mechanical. so far i have the TV as electrical, acoustic, and mechanical; the stove top as electrical, caustic, mechanical, ...
Thursday, January 6, 2011 at 7:13pm by Bri

physics
Concrete sidewalks are always laid in sections, with gaps between each section. For example, the drawing shows three identical 2.4-m sections, the outer two of which are against immovable walls. The two identical gaps between the sections are provided so that thermal expansion...
Thursday, July 25, 2013 at 2:19pm by justin

science
1. Could only find 2 links: http://search.yahoo.com/search?fr=mcafee&p=how+to+convert+mechanical+energy+to+thermal+energy 2. You might try some of the following links: http://search.yahoo.com/search?fr=mcafee&p=what+does+the+plateau+on+a+typical+warming+or+cooling+graph+...
Sunday, May 1, 2011 at 11:57am by SraJMcGin

Physics
How do i determine the rise in temperature when the passage of steam is continued until a further 15g of steam has condensed and the mixture is in thermal equilibrium when dry saturated steam at 100 degrees C is passed into 25g of a mixture of ice and water contained in a ...
Friday, March 9, 2012 at 6:38pm by Kingsley

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 distance ...
Wednesday, June 15, 2011 at 11:50pm by drwls

Physics
True or false? Are these correct? In a gas kept at a constant temperature, all molecules move with the same speed. FALSE. A hot object has more thermal energy than a similar cold object only because of greater kinetic energy. TRUE. 3. The thermal energy of the particles in a ...
Thursday, May 14, 2009 at 11:15am by Damian

Electric currents and magnetic fields
Within a material, what results in the conversion of an electron's energy to thermal energy and electromagnetical energy? The electron moving makes an magnetic field, if it changes, there will be an electric field with the magnetic field. Thermal energy is the result of ...
Thursday, December 14, 2006 at 10:23pm by Kalee

physics
k=2.7510¹º A/m⁴ R=0.003 m i=∫JdA=∫kr²2πrdr= kπR²/2 =3.5 A The rate of thermal energy generation is P=iV=3.560=210 W. Assuming a steady rate, the thermal energy generated in 2h=7200 s is Q=P Δt=2107200= 1.5112 10...
Tuesday, October 16, 2012 at 8:10pm by Elena

Physics
A sealed box containing a chunk of ice is made of 2cm thick wood, a good thermal insulator. The air outside the box is warm. It takes the ice one hour to melt. If I had put 2cm of aluminum (a good thermal conductor) around the outside of the box, in contact with the wood, the ...
Thursday, November 29, 2012 at 3:57am by StressedStudent

thermal physics
Here are some links you might find profitable: http://www.google.com/search?q=Thermal+Physics+Tutorial&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a Sra
Thursday, April 9, 2009 at 5:26am by SraJMcGin

physics
A slab of a thermal insulator with a cross-sectional area of 115 cm2 is 4.00 cm thick. It is made out of red brick with thermal conductivity 0.600 J/s∙mC. The temperature difference between opposite faces is 95.0 C. Calculate the following: (a) The heat current ...
Saturday, July 20, 2013 at 11:21am by Alice

Physics
A horizontal force of magnitude 30.0 N pushes a block of mass 3.85 kg a distance of 3.00 m across a floor, where the coefficient of kinetic friction is 0.600 a.)How much work is done by that applied force on the block-floor system? b.)During that displacement, the thermal ...
Tuesday, November 30, 2010 at 10:03pm by Sam

Heat Transfer
A fin 30 cm long & 10mm diameters throughout is made of steel alloy of thermal conductivity 43 W/m-deg. the fin attached to a plane heated wall at 200 deg.C temp. extends into surroundings at 25 deg.C.& Unit surface conductance of 120W/m^2-deg. Workout the heat flow rate from ...
Wednesday, August 1, 2012 at 7:11am by Rafeeq

Heat Transfer
A fin 30 cm long & 10mm diameters throughout is made of steel alloy of thermal conductivity 43 W/m-deg. the fin attached to a plane heated wall at 200 deg.C temp. extends into surroundings at 25 deg.C.& Unit surface conductance of 120W/m^2-deg. Workout the heat flow rate from ...
Wednesday, August 1, 2012 at 7:11am by Guru

College Physics
Electronics and inhabitants of the International Space Station generate a significant amount of thermal energy that the station must get rid of. The only way that the station can exhaust thermal energy is by radiation, which it does using thin, 2.2 m-by-4.1 m panels that have ...
Saturday, October 8, 2011 at 3:17am by Set5

Physics
Two cylindrical rods are made of the same material and have the same length but one is hollow and other is solid. Both are heated to same increase in temperature. Which rod expands more? From my understanding of linear thermal expansion, linear thermal expansion only depends ...
Monday, July 23, 2012 at 11:54pm by James

Physics
A metal tank with volume 3.10 L will burst if the pressure of the gas it contains exceeds 100 atm. (a) If 11.0 mol of an ideal gas is put into the tank at a temperature of 23.00C, to what temperature can the gas be warmed before the tank ruptures? You can ignore the thermal ...
Thursday, February 25, 2010 at 10:18am by Baker

physics
Assume that expansion is linear with temperature change. Actually, this is often not the case. The thermal expansion mentioned is also much too high for metals. The thermal coefficient of expansion often varies a lot with temperature. If a 150 deg C temp rise causes a 50% ...
Thursday, November 24, 2011 at 12:55am by drwls

Chemistry
A 100g sample of ice at 0C is added to 150.0 mL of liquid water at 80C in a styrofoam cup calorimeter. (The specific heat capacity of water is 1.184 J/gC, the density of water is 1.00 g/mL, and ∆Hfus = 6.01 kJ/mol) a) Does all of the ice melt?( show work to recieve ...
Monday, November 5, 2012 at 3:53pm by Lauren

Science
Using the second lay of thermodynamics, way energy cannot be recycled? Some energy is lost to entropy increase, and entropy is unusable energy. http://hypertextbook.com/physics/thermal/thermo-second/
Friday, July 6, 2007 at 9:49pm by Anonymous

Science
Sarah heated two cubes of aluminum to 50 degrees celsius. Cube B has a volume of two cubic centimeters. If the cubes do not touch each other, which of these statements is true? A. Cube A has a higher temperature than cube B. B. Cube B has a higher temperature than cube A C. ...
Tuesday, February 5, 2013 at 8:35pm by Sabrina

physics
An oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and heat energy. If the light bulb converts 75% of the electrical energy to thermal energy, and the oven is used for a ...
Thursday, May 30, 2013 at 8:49am by maddy

physic
http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
Monday, April 11, 2011 at 10:26am by bobpursley

Science
Thank you for using the Jiskha Homework Help Forum. Here is some help for you: 1. http://coolcosmos.ipac.caltech.edu//cosmic_classroom/light_lessons/thermal/transfer.html 2. http://www.qrg.northwestern.edu/projects/vss/docs/thermal/1-how-does-heat-move.html 3. http://www....
Tuesday, October 16, 2007 at 11:27am by SraJMcGin

Physics: true or false
1. In a gas kept at a constant temperature, all molecules move with the same speed. A. True B. False 2. A hot object has more thermal energy than a similar cold object only because of greater kinetic energy. A. True B. False 3. The thermal energy of the particles in a gas is ...
Friday, April 3, 2009 at 1:05pm by sophie

Physics
Overall 80 % of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated. The mechanisms of elimination are radiation, evaporation of sweat (2430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction, and convection. A person ...
Thursday, December 3, 2009 at 8:46am by Vico

science
Try some of the following links for information: http://search.yahoo.com/search?fr=mcafee&p=difference+in+Thermal+Energy+and+Heat.+ Sra
Monday, October 24, 2011 at 8:41pm by SraJMcGin

Science
http://coolcosmos.ipac.caltech.edu/cosmic_classroom/light_lessons/thermal/heat.html
Tuesday, October 26, 2010 at 9:53pm by Ms. Sue

Science
http://coolcosmos.ipac.caltech.edu/cosmic_classroom/light_lessons/thermal/heat.html
Tuesday, October 26, 2010 at 9:55pm by Ms. Sue

Science
http://coolcosmos.ipac.caltech.edu/cosmic_classroom/light_lessons/thermal/measure.html
Sunday, October 2, 2011 at 1:57pm by PsyDAG

chemistry
http://coolcosmos.ipac.caltech.edu/cosmic_classroom/light_lessons/thermal/differ.html
Monday, April 23, 2012 at 10:35pm by DrBob222

Physics
First let's use symbols people can read. a1 = 1.1*10^-5 C^-1 (thermal expansion cefficient of steel) a2 = 2.2*10^-5 C^-1 (thermal expnsion cefficient of aluminum) The hole and the ball will both expand in proportion to the linear expansion coefficient and the temperature rise...
Friday, March 25, 2011 at 10:47pm by drwls

physics 102
(T - 20)*(thermal expansion coeff.)* 30.6 = -0.06 Look up the thermal expansion coefficient of aluminum, and solve for T. It will be less than 20 C. http://hyperphysics.phy-astr.gsu.edu/hbase/tables/thexp.html
Saturday, April 27, 2013 at 8:42pm by drwls

Physics
If you are talking about two masses establishing thermal equilibrium with each other, the statement is false. The heat energy transferred to one equals the heat energy received by the other. If you are talking about two masses at the same temperature establishing thermal ...
Tuesday, June 21, 2011 at 9:49pm by drwls

physics
The Easy Bake Oven is a common toy for young children who want to emulate the process of cooking. Suppose this oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and heat ...
Thursday, May 30, 2013 at 11:05pm by Julia

Physics
This is not an exponential decay problem. Calculate the rate that heat enters the cooler. Heat will flow in at a rate dQ/dt = (Surface Area)*k/(thickness) where k is the thermal conductivity of Styrafoam (aka polyurethane foam). You will need to find a value for the thermal ...
Tuesday, August 9, 2011 at 4:33pm by drwls

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...
Wednesday, August 1, 2012 at 10:26am by SIDDIQUE

Science
C. thermal energy
Monday, February 26, 2007 at 8:11pm by unknown

physics
what is thermal resistance?
Friday, January 25, 2013 at 1:37pm by Phalguni

Material Science
Pure copper wire of diameter = 2.0 mm has an electrical resistance, R, of 0.005 ohm/m (upside down U/m). p = 8900 kg/ m cubed, Cp= 440 J/(kg K). Passage of electrical current produces thermal energy generation = I triangle V= I squared R (J/sec). Note that Units: Volts = J/...
Saturday, August 24, 2013 at 10:27pm by Joy

IPC
Sometimes thermal energy and sound energy can be harnessed to do useful work. However, these types of energy dissipate rapidly. Thermal energy produced by friction cannot usually be used to do work. A) True B) False my question is; it says they can be used to do work, but it ...
Monday, January 3, 2011 at 11:21am by Prue

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