Total # Posts: 451
The melting point of a solid is 90.0 degrees C. What is the heat required to change 2.5 of this solid at 40.0 degrees C to a liquid? The specific heat of the solid is 390 J/kg (K) and its heat of fusion is 4000 J/kg. A. 4.9 10^4 J B. 1.0 10^4 J C. 5.9 10^4 J D. 5.0 10^4 J I am...
April 3, 2009
Heat is added to an open container of a liquid. The liquid is brought to its boiling point and half the liquid boils away. Which of the following graphs shows how the temperature changes with this time period? Would the graph be just an ascending line?
April 3, 2009
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 ...
April 3, 2009
hello me again! i am now looking at the wounderful painting of "little blue horses" by Franz Marc, dose anyone know any good websites where i can find the background history of this painting! i would be very greatful, an also if anyone konws of any quotes that i ...
February 18, 2009
i am doing a project about franz marc an i need some info on one of his animal paintings this info consists of: name: when it was made: how it was made: what it was about: does it tell a story: what is in it: is it happy sad boreing etc: how you feel: and many more! but i dont...
February 12, 2009
i have to write a full A4 page with no pictures about Franz Marc but i can not find enough info i have when he was born where an when he died an some other stuff but i am not sure what else to think of an put in!!!
January 9, 2009
i really need some help!! i understand the parts of the heart and their names, but i am really confused on the cardiac cycle graph that shows the pressure of the heart at certains stages HELP ME PLEASE!
December 1, 2008
do all populations- micheline tires, voters, people with high blood pressue...- produce a normal curve? True or False Is this false because all samples produce normal curves and not the populations, and dont you have to have a range of values and freequencies to have a bell ...
November 21, 2008
thanks.. im making my box its kind of retro neon colours, i have all luminous bright colours splattered all around it , at the back i drilled holes in and iv made a type of corset lace look , with the bright orange pink and green lace, inside ive got half a barbie hanging, ...
October 20, 2008
The solubility of benzoic acid in water is 2.56g in 100cm3 at 79 C and 0.29g in 100cm3 at 20 C. What is the minimum volume of water in which 1g of benzoic acid can be dissolved at 79 C? I set up a dimensional analysis but since the question gives 2 sets of results, I do not ...
June 25, 2008
i have homework and we have to name this shape below and note one of it's specal properties;i have traiedlooking on pc but i don't know the name of it;have eney one got an idear.r.s.v.p. Sophie-opel evan
April 11, 2008
Assuming the final concentration of chloride anion after the addition of HCl (precipitation step) was 0.1M, what is the remaining concentration of Ag+ in the solution? (pKsp for AgCl = 9.74)
February 27, 2008
maths and english
i have trouble with my subtractioin i also have problems with my spellings please help Please check these sites for games to help you improve your spelling. http://www.funbrain.com/spell/index.html http://www.eduplace.com/kids/hmsv/smg/ Please post a subtraction problem that ...
May 9, 2007
my writing is not very nice and neat should i practice more Here is what you can do: Start a Journal (blank book), writing on alternate pages. Write in it every day. Weekly, give it to a trusted friend (mom, aunt, friend) who can take the journal and mark up errors. Rewrite ...
May 8, 2007
why use a 3 wire system instead of a 2 wire system when wiring an electric heater with metal casing So the metal casing can be "grounded" andnot aquire the potential lethal voltage if a 110 V wire inside becomes loose, wet or loses its insulation. If this happens, ...
December 29, 2006
Physics! PLEASE HELP re Newton's Laws
What would you do given the following scenarios? 1. You are the capitan of a spacecraft traveling in the far reaches of outer space, a great distance from any other body. Unexpectedly your radar indicates a meteor on a collision course with your craft, necessitating a sudden ...
December 3, 2006
Physics- Newton's Laws in Space
Hi! I would really appreciate it if you could help me think through these questions discussing Newton's Laws in Space... Directions: Consider the following scenarios ignoring the effects of gravity: 1. You are the capitan of a spacecraft traveling in the far reaches of ...
December 2, 2006
How do you find the angle of FAC when: D is in the interior of <BAE E is in the interior of <DAE F is in the interior of <EAC m<BAC=130 degrees m<EAC=100 degrees m<BAD=m<EAF=m<FAC ? FAC is 40 degrees. All of these lines are linear pairs held on an 180 ...
October 16, 2006