Number of results: 55,828
heat/science Xtremely important
Please help! I need a good website for HEAT in science! I'm in 8grade and I need info on heat http://www.school-for-champions.com/science/heat.htm
Wednesday, January 3, 2007 at 4:15pm by kp
Science
Organisms that maintain a constant body temperature rely on the heat produced by cells. Where does this heat come from? A) Special metabolic pathways exist just for the production of heat. B) Mitochondria produce heat in the form of ATP. C) Plants store up heat as they perform...
Wednesday, October 26, 2011 at 8:59pm by Jason
Science
I'm going crazy! The heat necessary to change the state of water between a solid and a liquid is called the latent heat of vaporization, latent heat of solidification, latent heat of fusion, latent heat of liquefaction, or none of the above. I thought it was none of the ...
Friday, December 8, 2006 at 11:25am by Pat
Science
yeh those are the two i narrowed it down to. You are very helpful though can I just ask you 1 more please. I think it's choice C, but I don't know really. Thank you! Organisms that maintain a constant body temperature rely on the heat produced by cells. Where does this...
Wednesday, October 26, 2011 at 7:29pm by Jason
science
uniform is the probably word they are looking for However, it is the temperature, not the heat, that "likes to remain" that way. Heat gets concentrated where the heat capacity is highest
Tuesday, March 24, 2009 at 3:20pm by drwls
heat/science
how is heat lost heat flows from a hot surface to a colder surface. Heat may be lost by conduction, convection, or radiation.
Wednesday, January 3, 2007 at 8:12pm by kp
science so confused??
heat capacity; temperature ; equal; calorimeter. Now on the first, the question is poorly worded. Heat given off is equal to the product of mass x specific heat capacity x change in temperature. Those three things define heat change. In olden days, mass x specific heat content...
Tuesday, April 22, 2008 at 1:18am by bobpursley
science
recall that heat absorbed released is given by Q = mc*(T2 - T1) where m = mass (in g) c = specific heat capacity (in J/g-k) T = temperature (in C or K) *note: Q is (+) when heat is absorbed and (-) when heat is released. substituting, Q = (480)*(0.97)*(234 - 22) Q = 98707 J = ...
Friday, October 28, 2011 at 2:30am by Jai
Science
Assume you can heat water with perfect insulation (all the heat from combustion of ethanol is transferred to water). What is the volume of ethanol required to heat 100 mL of water by 10 degrees C? (You will need to look up density of ethanol, specific heat capacity or water, ...
Thursday, March 21, 2013 at 2:08am by Alexandra
Science
I wanted to answer "Yes." But BobPursley explained it to me this way: "No air can come in/out, without an equal volume coming out/in. You are letting HEAT out. "Cold is the absence of heat. So heat goes out, and absence of heat comes in."
Friday, November 9, 2007 at 8:19pm by Ms. Sue
Science
A device that can be used both for cooling and heating is a _____. heat engine compressor heat pump vaporizer I think it is Heat pump..?
Monday, April 8, 2013 at 12:08pm by Cassie
Physical Science
Calculate the amount of heat required to heat a 45 sample of ethanol from 11.0 to 19.0. Specific heat capacity of ethanol is 2.42 .
Tuesday, October 19, 2010 at 12:19pm by Lechile
Science/Physics
The nerves in our skin do not sense temperature, they sense heat flow. If heat flow is great, we sense it as hot. If heat flow is outward, we sense it as cold. The seat has stored little heat, so touching it wont get much heat flow. The windshield actually has stored more heat...
Friday, December 9, 2011 at 6:18pm by bobpursley
science
your heat: 200*4.18*2.5 J heat per mole=your heat/(.005) = about 2000/.005J=about 400kJ work it accurately and see if D is correct.
Wednesday, December 29, 2010 at 5:17pm by bobpursley
science
The answer still is the same. Calcualte the heat stored in the 1 kg water and 1 kg gold and you will know which can produce the most heat to the bed. q = mass x specific heat x T
Saturday, September 8, 2007 at 6:27pm by DrBob222
science
Do you know the specific heat of solid water (ice)? If so, then it will take q calories = mass ice x specific heat ice x (0+10) to raise T from -10 C to zero C. Subtract that from 4500 to see how much(if any) heat is left. If some heat is available, then it can go to melting ...
Tuesday, January 3, 2012 at 3:20pm by DrBob222
material science
How much heat (in BTU) would be required to heat and vaporize 100 lb of water from 25°C to saturated steam at 1 atm? Assume heat capacity is constant at 1 BTU/lb-°F and the latent heat of vaporization is 1,000 BTU/lb
Wednesday, January 19, 2011 at 8:37am by zura
SCIENCE
A steady-state heat engine that absorbs 8000 J from a high-temperature reservoir and rejects 1000 J to a cold heat sink would produce 7000 J of work. There would be no other place for the energy to go. The heat engine efficiency would be 87.5%. I know of no heat engines that ...
Thursday, August 18, 2011 at 12:36am by drwls
Physcial science
Note that Celsius is the correct spelling. q = mass x heat fusion. Look up the heat of fusion for ice (in joules/g). You have the mass. Calculate q, the heat required to melt the ice. Be careful that specific heat you use doesn't conflict with the units for mass.
Monday, November 3, 2008 at 5:53pm by DrBob222
9th grade
add the following energyies: heat to heat ice at -10 to 0 heat to melt 20 g ice at 0C Heat to heat water from 0C to 100C heat to vaporize 20gwater at 100C. heat to heat steam from 100C to 200C
Tuesday, January 5, 2010 at 6:46pm by bobpursley
science
When you freeze water, 80 calories of heat are released into the surroundings for every gram of water that freezes. This is known as the "latent heat of fusion" of water, which is 80 cal/g. Heat of fusion is a characteristic property. Theoretically, if you could &...
Monday, January 31, 2011 at 12:14am by Elizabeth
science so confused??
help please I keep reading about heat in my book and jsut cant get it. the amount of heat gained or lost by a substance is equal to the product of its _______ times the change in _______. Within a closed container, the heat lost by one substance must be ______to the heat ...
Tuesday, April 22, 2008 at 1:18am by sam
Science
A 'heat calorie' is the amount of energy it takes to heat 1 mL of water 1 degree celsius. This is the 'real' calorie. A food calorie is 1000 heat calories. 1 food calorie is written as 1 C. So when you eat something with '150 calories', you're ...
Saturday, March 5, 2011 at 10:26pm by Hannah
science
heat=heatmeltingIce+heatRisingTempWater 5640=10*Lf + 10*cwater*(50-0) put in the specific heat of water cw, in joules/gram-C, and solve for heat of fusion, Lf.
Thursday, September 20, 2012 at 10:21am by bobpursley
Physical Science
(g steam x heat vap) + (mass ice x heat fusion) + [(mass steam H2O x specific heat x (Tfinal-Tinitial)] + [mass melted ice x specific heat x (Tfinal-Tinitial)]= 0 I don't know what units you ae using; you substitute them. (1g x -heat vap) + (xgrams x heat fusion) + [(1g x ...
Sunday, March 10, 2013 at 11:03pm by DrBob222
SCIENCE QUESTION
LEAD IS A SOFT, DENSE METAL WITH A SPECIFIC HEAT OF 0.028KCAL/KGC, A MELTING POINT OF 328.0C, AND A HEAT FUSION OF5.5KCAL/KG. HOW MUCH HEAT MUST BE PROVIDED TO MELT A 250.0KG SAMPLE OF LEAD WITH A TEMPERATURE OF 20.0C? Figure the heat to heat if from 20C to the melting point (...
Saturday, October 7, 2006 at 10:14pm by priscilla
physical science
q = quantity of heat = mass x specific heat x T
Tuesday, July 5, 2011 at 10:30pm by DrBob222
science
Black absorbs heat; white reflects heat.
Tuesday, February 17, 2009 at 12:27pm by DrBob222
Science
How much heat is necessary to heat 100 g of water at 10°C to 95°C?
Friday, October 12, 2012 at 2:51pm by Anonymous
science
Which has more stored heat? Ans: the one with the highest heat capacity.
Saturday, September 8, 2007 at 6:27pm by bobpursley
physical science
suppose you want to heat 40g of water by 20c.how many joules of heat are required
Friday, October 12, 2012 at 4:24pm by Anonymous
science
A _____ of heat is a place from which the heat comes.
Tuesday, January 25, 2011 at 4:14pm by carol
Physical Science
They don't tell you the mass of the coffee, but you know the mass of the spoon. The heat lost by the coffee equals the heat absorbed by the spoon. Call it Q Q = (spoon mass) x (silver specfic heat) x (temperature rise of spoon) The specific heat of silver is 0.234 Joules/(...
Thursday, November 1, 2007 at 11:10pm by drwls
science
That depends upon how much there is and how has heat is being added to the mercury. It will not heat up by itself.
Tuesday, January 29, 2013 at 11:40pm by drwls
Science
heat= heatsublimation*mass I am not certain what your units are on the heat of sublimation, but they need to be in Joules/gram.
Saturday, March 12, 2011 at 1:34pm by bobpursley
Physical Science
Q (heat) = M * C *(change in T) M is the mass and C is the specific heat. You know all three quantitiies Take it from there.
Tuesday, October 19, 2010 at 12:19pm by drwls
Physical Science
Look at the heat capacities. Copper has a greater heat capacity per degree.
Tuesday, October 19, 2010 at 9:15am by bobpursley
Physical Science
Suppose you want to heat 40 kg of water by 20 C. How many joules of heat are required?
Saturday, November 14, 2009 at 3:52pm by Roberta
Science
Do you want this in BTU? q1 = heat to move from 180 to 212. q1 = mass x specific heat x (212-180) q2 = heat to vaporize water at 212 to steam at 212 F. q2 = mass x heat vaporization. Total heat = q1 + q2.
Monday, September 3, 2012 at 1:57pm by DrBob222
Physical Science
lead has specific heat of .028kcal/kgC, melting point of 328 degrees C and a heat fusion of 5.5 kcal/kg. how much heat must be provided to melt a 250kg sample of lead with a temperature of 20 degrees Celsius?
Friday, April 8, 2011 at 12:16am by yolanda
physical science
suppose you want to heat 40kg of water by 20 degrees celcius. how many joules of heat are required?
Thursday, October 2, 2008 at 5:32pm by Rosemary
science
is it energy or heat that produces heat thanks
Tuesday, April 22, 2008 at 12:54am by sam
Chemistry
heat lost by hot water + heat gained by cold water = 0 heat lostt or heat gain is mass x specific heat x (Tfinal-Tinitial)
Tuesday, June 7, 2011 at 8:23am by DrBob222
science
recall that heat absorbed released is given by Q = mc*(T2 - T1) where m = mass (in g) c = specific heat capacity (in J/g-k) T = temperature (in C or K) *note: Q is (+) when heat is absorbed and (-) when heat is released. we're looking for (T2 - T1) here. substituting, ...
Friday, October 28, 2011 at 2:36am by Jai
science
You wish to heat 30 kg of water from 60°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?
Friday, October 12, 2012 at 5:09pm by LeAnne
Science
q1 is heat from -10 to 30 q1 = mass x specific heat of frozen x (Tfinal-Tinitial) q2 = heat at 30 to thaw at 30. q2 = mass x heat fusion q3 = heat from 30 to 200 q3 = mass x specific heat of thawed x (Tfinal-Tinitial) Total heat = q1 + q2 + q3
Sunday, September 2, 2012 at 2:55pm by DrBob222
Science
heat lost by hot water + heat gained by cold water = 0 BUT something is wrong here because it doesn't. Heat was lost somewhere to the surroundings. 1. Temperature change is 60-39. 2. mass water x specific heat x (Tfinal-Tinitial) = 20g x (1 cal/g*c) x (39-60) = ?? 3. 40g x...
Monday, March 29, 2010 at 6:13pm by DrBob222
physical science
You wish to heat 30 kg of water from 60°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?
Saturday, March 2, 2013 at 12:26am by Anonymous
science
If it were a good conductor of heat, then the glass rod would heat up all the way to the top and you might not be able to hold it.
Thursday, November 13, 2008 at 12:01pm by E.G.
science HELP
the amount of heat gained or lost by a substance is equal to the product of its heat capacity times the change in temperaturetimes its _____________
Tuesday, April 22, 2008 at 9:21am by sam
Science
Can you describe forced convection? Please? It is a fan blowing a fluid across a heat source or heat sink. Thankz!! :P
Tuesday, December 12, 2006 at 6:20pm by Caley
science
Which provides more cooling for a Styrofoam cooler, one with 10lb of ice at 0C or one with 10lb of ice water at 0C? Explain your reasoning. 10# ice requires heat to melt the ice + heat to heat the water after it melts. 10# ice water requires heat to heat the water. Which do ...
Saturday, February 17, 2007 at 2:49pm by patrick
Science Dr. Bob222
I don't know how to find the specific heat in q1. I have q1 = 320 (specific heat) #2) How do I find heat vaporitzation for q2?
Monday, September 3, 2012 at 1:57pm by Anil
Chemistry Science
heat lost by Fe + heat gained by H2O = 0 [mass Fe x specific heat Fe x (Tfinal-Tinitial)] + [mass H2O x specific heat water x (Tfinal-Tinitial)]= 0 Substitute and solve for specific heat Fe.
Sunday, May 27, 2012 at 9:41pm by DrBob222
science
an aluminium container of mass 100g contains 200 g of ice at -20'c heat is added to the system at the rate of 100 cal/sec. what will be the final tmperature of the mixture after 4 min? given:specific heat of ice:0.5 cal/gm'c ,latent heat of fusion:80 cal/gm and ...
Thursday, March 17, 2011 at 8:32pm by anu
Science - Chemistry!!!
A lead bullet with a mass of 8.50 g traveling at 4.80 x 102 m/s strikes a 2.00 kg block of wood and is embedded in it. Both the bullet and the block are initially at 25.0°C. Assume that no heat is lost to the surroundings and that all the kinetic energy of the bullet is ...
Tuesday, October 23, 2012 at 11:07am by Lola
science
what uses both heat and sound. what uses both heat and electric what uses heat and kinetic. please help
Thursday, March 10, 2011 at 7:21pm by energy
Chemistry
Heat energy is the amount of heat used or available; heat capacity is the ability of a substance to absorb heat. Heat energy is measured in J or kJ and heat capacity is measured in J/g*K.
Saturday, April 21, 2012 at 3:15pm by DrBob222
science
Heat is stored in masses. How much heat depends on the temperature change, and the heat capacity. Things like water have very high heat capacity, so that if solar energy impinges, the temperature of the water does not change much. On the other hand, sand, and air, do not have ...
Sunday, September 12, 2010 at 1:21pm by bobpursley
Check 1 question.
Yes, you are correct. The first one is heat fusion. The second is heat of combustion. The third is heat of decomposition. The fourth is heat of solution.
Friday, June 22, 2012 at 1:39pm by DrBob222
science
heat and sound products electric and heat products kinetic and heat products ex.electric and sound ipod mp3 wii laptop tv please help!
Thursday, March 10, 2011 at 7:21pm by energy
physical science
Lead is a soft, dense metal with a specific heat of 0.028 kcal/kg·C°, a melting point of 328.0°C, and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 202.2 kg sample of lead with a temperature of 20.0°C?
Tuesday, October 12, 2010 at 10:56pm by Anonymous
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
science
what quantity of heat must be absorbed to convert 86.1 g of liquid to a vapor at its boiling point, -24.09 c? the heat of vaporization of ch3cl is 21.40
Saturday, April 23, 2011 at 1:29pm by Lindy
physics
I will be happy to critique your thinking. Add the following heats: heat to melt ice heat to warm water to 100C heat to change water to steam heat to heat steam to 150C
Thursday, April 21, 2011 at 12:39am by bobpursley
Science
q1 = heat removed to condense steam at 100 to liquid at 100 C. q1 = mass x heat vaporization q2 = heat removed to cool from liquid water at 100 C to body temperature of 37 C. q2 = mass water x specific heat water x (Tfinal-Tinitial). Tf = 37, Ti = 100. Total heat absorbed by ...
Wednesday, July 13, 2011 at 5:40pm by DrBob222
Physics
How much heat is added to a 10.0 g of ice at -20.0 degrees Celsius to convert it to steam at 120.0 degrees Celsius? compute and add the following heats: heat to heat ice from -20C to 0C heat to melt ice at 0C Heat to heat water from 0 to 100C heat to convert water to steam at ...
Monday, March 5, 2007 at 7:45pm by Marie
chemistry
how much heat is required to completely vapporize 2.3 grams of ice starting at -50 degrees Celsius? (the specific heat of ice is 2.0 J/g.C; the specific heat of water is 4.184 J/g.C; the heat of fusion is 333 J/g; and the heat of vaporization is 22601 J/g)
Tuesday, March 22, 2011 at 12:04am by Anonymous
Physics
Heat lost by spoon = heat gained by water Use that heat, the aluminum temperature drop, and the specific heat of aluminum to get the mass. Ignore the styrafoam mass. It acts as an insulator to keep the heat inside, and weighs very little.
Saturday, May 7, 2011 at 12:56am by drwls
science
heat= mass*specific heat water*deltatemp solve for mass. Watch units.
Monday, May 24, 2010 at 10:08pm by bobpursley
science
what must be changed temperature or heat energy during condensation I think it is heat energy
Monday, October 22, 2007 at 2:09pm by bella
science
how much heat is required to heat 500 g of copper from 20 degree celsius to 80 degree celsius? specific heat of copper is 0.093 cal/g- degree celsius
Sunday, December 2, 2012 at 9:39pm by sam
science
Use the info provided by SraJMcGin plus the following: q= heat needed = mass Al x specific heat Al x (delta T). Use 50-21 for delta T. You must look up the specific heat of Al.
Friday, September 4, 2009 at 12:59pm by DrBob222
Science
C. Although some of the sun's infrared is transmitted through the glass, most is not. What is transmitted is not changed to heat; it already is heat.
Wednesday, September 26, 2012 at 12:01am by drwls
physical science
q = mass water x heat fusion. q will be in the same units as heat fusion.
Tuesday, March 16, 2010 at 10:12pm by DrBob222
Science - BTUs Please help
Although I vaguely see DrBob222's concept, I still need some help in the set up. Thank you. A 10 lb. frozen boneless roast needs to be thawed and baked to a temperature of 200 degrees F. The storage freezer maintains a temperature of -10 degrees F. Pork changes from solid ...
Monday, September 3, 2012 at 12:33pm by Sejul
science
Why is a heating element with a thermostat placed on the bottom of an aquarium? To heat the water. Heat rises so you would put it at the bottom of the tank.
Thursday, November 2, 2006 at 7:04pm by kelli
science
As a scientist, I recognize that cooking is mainly an art. The science is minimal (containing or destroying bacteria, breaking up protein with heat, and maybe some science in the biology of yeast in breads and cakes), but the main success of any cook is a art, not science.
Wednesday, September 9, 2009 at 9:15pm by bobpursley
science
a car of mass 1360 kg descends from a hill of height 86 m at a constant speed of 20 km/h. assuming that all the potential/kinetic energy of the car goes into heat in the brakes, find the rise in temperature of the brakes (use the heat capacity (C) of the brakes to be 16kJ/C ...
Saturday, April 26, 2008 at 7:02pm by kelsee
Science
For my science class I have to make a machine that attempts to convert heat energy into work. I'm not really sure how to do this, but I do have some ideas, however I'm not all the way there. If you told me your opinion of my ideas or if you gave me one of your ideas ...
Wednesday, October 15, 2008 at 9:42am by Lynn
chemistry
Let the heat capacity of A = c. The heat capacity of B is 2c. Let the final temperature be T. The heat lost by B when A and Be are placed together is: (2c)(450-T) The heat gained by A is (c)(T-300). Assuming the Law of conservation of Energy holds, and there are no heat losses...
Monday, June 22, 2009 at 5:43pm by GK
Science/C
A 250 gram sample of metal is warmed from 50°C to 90°C when 100 calories of heat are added. What is he specific heat capacity of the metal?
Friday, October 12, 2012 at 2:34pm by Raylee
science
the specific heat of sliver is 0.235j /g.c. how much heat is neeeded to raise the tempreature of an 8 gram sliver ring be 50 degrees celecius
Tuesday, March 1, 2011 at 4:18pm by nikita
PHYSICAL SCIENCE
DOES MOTION PRODUCE HEAT WE NEED TO ANSWER TRUE OR FALSE ON OUR HOMEWORK IF YOU RUN THAT IS MOTION WHICH MAKES YOU SWEAT THIS IS HEAT???
Tuesday, April 22, 2008 at 9:24am by claire
science
Specific heat of water: 4.187 kJ/kg-K Specific heat of steam: 1.996 kJ/-kgK Heat of vaporization = 540 kcal/kg heat removed per kg: 20*1.996 + 10*4.187 + 540 = 622 kcal/kg
Thursday, October 13, 2011 at 1:03am by drwls
Science
A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...
Monday, September 26, 2011 at 1:29am by Anonymous
Physical Science
The infrared heat and light radiation from the bulb goes instantly to your skin, but it takes time for the bulb to warm up because of its heat capacity.
Monday, March 10, 2008 at 6:12pm by drwls
Science
1. How much heat energy is lost by 3 kg of water when it cools from 80 degrees C to 10 degrees C? 2. A 300 g piece of aluminum is heated from 30 degrees C to 150 degrees C. What amount of heat energy is absorbed? 3. Determine the temperature change in each of the following. (a...
Sunday, October 23, 2011 at 12:56am by Debra
Science
How about a candle giving light and heat? Or gasoline and air (chemical energy) burning in an engine and accelerating a car (to produce kinetic and heat energy)
Saturday, December 29, 2007 at 8:56pm by drwls
Physics
figure this in three parts: heat to heat water from 25C to 100C heat to vaporize water at 100C heat to heat steam from 100C to 120C add them
Thursday, November 18, 2010 at 8:46pm by bobpursley
Science 8R - help (please read!!!)
Homework - Pick 4 out of the 6 forms (types) of energy and gives an example of each from your house. Types/Forms of Energy 1. Mechanical Energy 2. Electrical Energy 3. Electromagnetic Energy 4. Heat Energy 5. Chemical Energy 6. Nuclear Energy I'm picking heat and ...
Monday, November 26, 2012 at 8:39pm by Laruen
science
A heat exchanger is used to warm apple cider using steam as the heat source. The cider is heated from an initial temperature of 4 degrees celcius to a final temperature of 65 degree celcius. The steam enters the heat exchanger as 50% quality steam and exits as water condensate...
Monday, March 4, 2013 at 8:02pm by Bev
chemistry HELP
heat = (sp. heat)(grams)(temp. change) or q = (C)(m)(Tf-Ti) Heat released by Cu = Heat absorbed by H2O (C)(46.2g)(95.4C-21.8C)= (4.18J/g.C)(75.0g)(21.8C-19.6C) Solve for C to get the specific heat of copper.
Friday, January 2, 2009 at 7:52pm by GK
Science
The specific heat of copper metal was determined by putting a piece of the metal weighing 33.6 g in hot water. The quantity of heat absorbed by the metal was calculated to be 47 J from the temperature drop of the water. What was the specific heat of the metal if the ...
Saturday, October 18, 2008 at 10:42pm by Brittany
science
The specific heat of solid gold is 0.13J/gC.How much heat is needed to raise the temperature of 25.0g of gold from 23C to its melting point at 1063C
Friday, July 15, 2011 at 11:30pm by Toni
Science
Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
Saturday, March 12, 2011 at 5:30pm by Katie
Science
Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
Saturday, March 12, 2011 at 1:34pm by Katie
Chemistry
find the heat of commbusion, then figure the heat from the ocatane. Now, the water: heat to heat water:masswater*c*22 efficiency=heatforwater/heatfromoctane * 100 if you want it in percent.
Monday, February 4, 2013 at 6:07pm by bobpursley
Physics
There may be friction in a hydraulic jack, and a bit of heat produced, but that does not make it a heat engine. A heat engine converts heat to mechanical energy. None of the things on your list do that.
Sunday, January 2, 2011 at 11:38pm by drwls
Science
recall that heat absorbed or released is given by Q = mc(T2 - T1) where m = mass (in kg) c = specific heat capacity (in J/kg-K) T = temperature (in C or K) *note: Q is (+) when heat is absorbed, and (-) when heat is released. #1. we just substitute. the c for water is equal to...
Sunday, October 23, 2011 at 12:56am by Jai
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