Saturday
November 22, 2014

Search: thermo

Number of results: 34

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/
July 6, 2007 by Anonymous

Design and Technology
Why is the acrylic memory process only possible with thermo plastics?
September 13, 2008 by Lilly

Chemistry
How can you predict whether the change in entropy for a system will be positive or negative? Like if the enthalpy is negative what will the entropy be? Try these 2 sites: http://www.shodor.org/unchem/advanced/thermo/index.html http://en.wikipedia.org/wiki/Chemical_reaction
May 19, 2007 by Christian

physics, thermo
calculate the heat required to produce 1.7 kg of wet steam at 2000 kpa from water at 160 degrees celsius and a dryness fraction of 81%, answer in kj.
May 27, 2013 by chad, please help

Thermo Dynamics
Air loses heat to the surroundings at a rate of Q.= t/6 where out Q. is in Watts and t is time in seconds. For 20 minutes of operation, determine the heat loss from the air in kWhr???
May 10, 2011 by Justin

thermo
equal masses of ice at 0 oC, water aat 50 oC and steam at 100 oC are mixed and allowed to reach equilibrium. what will be the final temp of the mixture? and what percentage is the water and what percent will be steam??
November 5, 2010 by holly

thermo
equal masses of ice at 0 oC, water aat 50 oC and steam at 100 oC are mixed and allowed to reach equilibrium. what will be the final temp of the mixture? and what percentage is the water and what percent will be steam??
November 5, 2010 by holly

Thermo
Calculate the standard cahnge in enthalpy for the combusation of coal/ Show the balnaced reaction. How does one get the balanced reaction of coal? Coal has many substances that make up its compsistion
March 18, 2012 by Scott

Science
Warm air often goes to the upper parts of the house. Whar is the name of the process by which air moves and carries heat energy with it ? Since this is not my area of expertise, I searched Google under the key words "heat convection" to get these possible sources: http://sol....
April 24, 2007 by ASD

thermo
Consider a cylinder containing air at 1200 kPa and 350 C and then, the air is expanded to 140 kPa with a reversible adiabatic process. Calculate the speci c work (kJ=Kg) done by the gas. Assume calorically perfect gas.
March 30, 2010 by john

thermo
Consider a cylinder containing air at 1200 kPa and 350 C and then, the air is expanded to 140 kPa with a reversible adiabatic process. Calculate the speci c work (kJ=Kg) done by the gas. Assume calorically perfect gas
March 31, 2010 by john

Physics - electricity
A thermo junction of iron and copper connected to a galvanometer cannot be used to measure temp above about 450K, whereas one of iron-constantan may be used to at least 875K. What is the explanation? Is it possible that melting at the junction point is a limiting factor?
April 17, 2007 by Damilola

physics - another thermo problem
A bicycle pump is a cylinder 20 cm long and 3.0 cm in diameter. The pump contains air at 25.0 C and 1.0 atm. If the outlet at the base of the pump is blocked and the handle is pushed in very quickly, compressing the air to half its original volume, how hot does the air in the ...
September 18, 2008 by Nik

chem thermo
consider a system consisting of 2.0mol co2(g) initially at 25c and 10atm and confined to a cylinder of cross section 10.0cm2. it is allowed to expand adiabatically against an external pressure of 1.0atm until the piston has moved outwards through a 20cm. assume that co2 is a ...
October 20, 2013 by susie

Thermo engineering
The driveshaft of a building’s air-handling fan is turned at 300 RPM by a belt running on a 0.3-m-diameter pulley. The net force applied by the belt on the pulley is 2000 N. determine the torque applied by the belt on the pulley, in N.m, and the power transmitted, in kW.
May 10, 2011 by Justin

Chemistry
Ethanol, C2H5OH or C2H6O, is mixed with gasoline and sold as gasohol. Given the following thermo-chemical reaction, calculate the kilograms (kg) of CO2 produced when enough ethanol is combusted to provide (or give off) 369 kJ of heat: C2H5OH (l) + 3 O2 (g) --> 2 CO2 (g) +3 ...
July 12, 2011 by Robert

Thermo
In an isothermal reaction (either reversible or irreversible), DELTA T is constant..hence zero since temperature remains constant, can we also assume that heat is also zero? if so, how then is an isothermal reaction different from an Adiabatic one?
March 12, 2010 by Kim P

Chem Question (thermo)
Calculate ΔG at 25 ºC for a reaction in which Ca2+(aq) combines with CO32–(aq) to form a precipitate of CaCO3(s) if the concentrations of Ca2+(aq) and CO32–(aq) are 0.023 M and 0.13 M, respectively. (ΔGº = –47.94 kJ) A. –62.3 kJ/mol B. –33.5 kJ/mol C. –17.8 kJ/mol D...
March 1, 2012 by M

Physics-Thermo
Imagine a 600 g of water at 70oC in a piston-cylinder device. Initially, the 9-kg, 13-cm diameter piston rests on two stops such that the water occupies a volume of 0.2 m3. Heat is transferred to the system until the water is completely vaporized. Take the atmospheric pressure...
March 26, 2012 by sara

science
Whar is the name of the process by which hrat energy is tranferred through the walls of the house ? Conduction, convection, and radiation are the three ways energy is transferred. Look up each in your text/notes/dictionary and make your choice. In case you are posting under ...
April 24, 2007 by QAQA

thermo
four hundred cubic centimeters of a gas at 740mm Hg absolute and 18 degree celcius a process until the pressure until the pressure becomes 760mm Hg absolute and the temperature o degree celcius. what is the final volume of the gas
October 3, 2012 by 111111

Science
What is the name of the process by which energy reaches the walls of the house directly from the sun ? In case you are posting under difference addresses, please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time ...
April 24, 2007 by 12345

college (physics thermo)
A 1.20 mol sample of an ideal diatomic gas at a pressure of 1.20 atm and temperature 380 K undergoes a process in which its pressure increases linearly with temperature. The final temperature and pressure are 680 K and 1.83 atm. (assume 5 active degrees of freedom) b. ...
February 2, 2009 by dennis

thermo
Saturated water vapor at 100 kPa jets into a pitcher containing 0.17 Kg of water initially at 278 K. If steam ow rate is 4 gm/min, estimate how long it takes to heat the water to 322 K. Assume the process is at constant pressure (at 100 kPa) and kinetic energy of the incoming ...
March 31, 2010 by john

Thermo
one more question: a worker cleans a railroad car with steam of 15000ft^3 car on inside, t=240F P=14.7psia of steam. the car is closed. the steam inside cools until P=12 psia, at which time salad oil is added to tank. find a. heat transfer from steam during cooling, b. amount ...
March 15, 2010 by spencer

Chemistry (Thermo)
High quality coal (anthracite) is almost pure carbon. The combustion of carbon to carbon dioxide releases 393kJ per mol of carbon burnt. If 1kg of anthracite is burnt: a) How much heat is released? b) How much ice (in kg) at 273K could be melted to give water at 273K? c) How ...
September 10, 2010 by Amy

Science
Match these with the key terms (1) A form of energy that is always transferred from a warmer substance to a cooler one. (2) device that converts hear to a small amount of electric energy often used in temperature sensors. (3) A Push button barbecue lighter produces a small ...
December 2, 2013 by Aurore

more thermo
For the following question I was able to find the heat transfer and the entropy but I am having trouble finding the work done. When i solved delta E = Qnet - Wnet I got Win = Wout but Im not sure that is correct. I think that i need to solve for the final temp and pressure but...
June 18, 2007 by jody

Chem.
Nitrogen oxide (NO) has been found to be a key component in the many biological processes. It also can react with oxygen to give the brown gas NO2. When one mole of NO reacts with oxygen, 57.0 kJ of heat is evolved. a) Write the thermochemical equation for the reaction between...
January 29, 2007 by Christopher

thermo
For the following problem... I found the second pressure by solving P1V1/T1 = P2V2/T2. The Volumes is const so those cancel and then i am able to find the P2. From there i looked at the 1st law and came up with delt U = Qin which = mCvdelta T but that is where I am stuck. Can ...
June 17, 2007 by jody

Science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
January 30, 2014 by Sania

Physics
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
January 30, 2014 by Sania

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
January 30, 2014 by Sania

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
January 30, 2014 by Sania

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