Monday
March 2, 2015

Posts by ali


Total # Posts: 567

Math
11+2*(6+11)
June 18, 2012

Chemistry
In the following experiment, a coffee-cup calorimeter containing 100 \rm mL of \rm H_2O is used. The initial temperature of the calorimeter is 23.0 \rm ^{\circ}C. If 9.80 g of \rm CaCl_2 is added to the calorimeter, what will be the final temperature of the solution in the ...
June 17, 2012

Biology
Which of the following are three common characteristics of echinoderms? A tube feet, circulatory system, body symmetry B marine-dwellers, endoskeletons, water-vascular system C bilateral symmetry, ossicles, respiratory system D mouths, protosomes, body symmetry is it C...
June 14, 2012

geography
Southwest Asia can best be characterized as A) an area with few resources. B) a desert with an arid and semiarid climate. C) a region of forests. D) an area of forests and grasslands. I think it's B, just checking! thanks in advance
June 7, 2012

business
Is the correct answer D?
June 6, 2012

Physiology
if someone is infected with the common cold virus, which type of nonspecific immune response would attempt to deal with the invader? A) T cells B) b cells C) antibodies D) none of these
June 6, 2012

Math
how do you subtract hundreds?
June 4, 2012

Chemistry
1.) What are the equilibrium partial pressures of CO and CO2 if co is the gas present initially, at a partial pressure of .912 atm. Kp = 19.9 Fe2O3 + 3CO <--> 2Fe + 3CO2 I'm trying to find partial pressure of both CO and CO2 by calculating for "x" in the ...
May 8, 2012

statistics
a set of maths exame score mean is 70 and variance is 8. a set of english score has mean is 74 and variance is 16. for which exame whould a score of x=78 have a higher standing?
May 5, 2012

calcalus
Water is leaking out of an inverted conical tank at a rate of 12200 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 65 meters. If the water level is rising ...
May 2, 2012

Chemistry
KMno4+NaHso3
May 2, 2012

physics
A 40N force applied at an angle of 37 degrees above the horizontal pulls a 5kg box on a horizontal floor. the acceleration of the box is 3meter per second square. how large a frictional force must be retarding the motion of the box. a.50N b.13N c.17N d.25N
April 20, 2012

physics
a 2kg and a 4kg hang freely at opposite end of a light in-extensible string which passes over a small and light pulley fixed to a rigid support.calculate the acceleration of the system. a.3.3M/S square b.2.67m/s square c.4.41m/s square d.2.67m/s square.
April 20, 2012

physics
a 2kg and a 4kg hang freely at opposite end of a light in-extensible string which passes over a small and light pulley fixed to a rigid support.calculate the acceleration of the system.
April 20, 2012

Thermodynamics
Suppose an enzyme lowers the activation energy by an order of magnitude. What is the ratio of catalyzed rate to the uncatalyzed rate at at 25 °C? at 37 °C?
April 9, 2012

Honors Chemistry
1. 5 2. 1.0 x 10^-5 3. 2.5 4. 12 5. 1.26 x 10^-9
April 6, 2012

math
The perimeter of a rectangular pool is 84 feet. The width of the pool is half the length. What are the measurements of the rectangular pool?
March 20, 2012

trig
if cot(x-10)=tan(4x) what does x equal?
March 4, 2012

chemistry
how do you do electron dot diagrams?
March 3, 2012

Math
4*10=40 slices of bread. 18 ppl eat 2 slices each, making 36 eaten 36/40 slices were eaten
March 1, 2012

Chemistry--Plz HELP!
How would i go about balancing the following equation? My teacher said something about the charges: Silver Nitrate + Sodium Phosphate = Silver Phosphate + Sodium Nitrate
March 1, 2012

Chemistry-Stoichiometry
A 1.146 mixture of the solid salts Na2SO4 and Pb(No3)2 forms an aqueous solutionwith the precipitation of PbSO4. The precipitate was found to weigh 0.672g. The limiting reactant is Na2SO4. What is the percent by mass of each salt in the mixture?
March 1, 2012

math 2nd grade
simon ate 3/2 slices of an apple. Did he eat less than a whole apple or more than the whole apple. Draw a picture to show your answer
February 29, 2012

Econnomics
junanita has 6000 in a two year certificate of deposit (CD) money supply definitions
February 28, 2012

MATH - area question
I need help on where to begin with this problem. You are installing a new deck around your pool. The pool is rectangular with the dimensions 8m by 4m. The deck will surround the pool and will have a width by 2m. What is the area of the deck? I know that A=LxW and that the Area...
February 27, 2012

Math (Area)
I need help on where to begin with this problem. You are installing a new deck around your pool. The pool is rectangular with the dimensions 8m by 4m. The deck will surround the pool and will have a width by 2m. What is the area of the deck? I know that A=LxW and that the Area...
February 27, 2012

math
lisette drew a rectangle and divided it into fourths. She colored the whole rectangle. How many fourths were colored?
February 27, 2012

math
simon ate 3/2 slices of an apple. Did he eat less than a whole apple, the whole apple or more than a whole apple. Draw a picture to show the answer.
February 27, 2012

MATH
what addition fact can help you find 14-4? explain
February 27, 2012

english
what does this question mean?
February 21, 2012

english
also how does she describe her feelings as she waits for him?
February 21, 2012

english
ROMEO AND JULIET what are juliets feelings towards romeo in act 3 scene 2 from lines 1-35?
February 21, 2012

chemistry
Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...
February 19, 2012

engineering
Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...
February 19, 2012

math
for every 20 math books a school buys, they they get 7 aditional books for free. The school needs 297 math books. What is the total number of math books the school must buy in order to receive 297 math books in all?
February 8, 2012

Dynamics
A quarterback throws a football with a velocity vo at an angle of 45o with the horizontal. At the same instant a receiver standing 20 ft in front starts running down the field at 15 ft/s and catches the ball. What is the distance of the receiver from the quarterback when the ...
January 30, 2012

math
Thank You so much Ms. Sue,
January 26, 2012

math
3rd grade create an algorithm that has a difference of 20
January 26, 2012

Math
what is the scientific notation of 1,890,000
January 24, 2012

physics
A stone is launched straight up by a slingshot. Its initial speed is 20.1 m/s and the stone is 1.30 m above the ground when launched. Assume g = 9.80 m/s2. (a) How high above the ground does the stone rise? (b) How much time elapses before the stone hits the ground?
January 24, 2012

calculus
reverse the order of integration integration 1-e integration 0-lnx dy dx
January 12, 2012

English
ok thank you
December 15, 2011

English
I do not know I do think its situational though
December 15, 2011

English
Situational? I do not know I'm not very good at irony.
December 15, 2011

English
"Out of spite, the human being pretended not to believe that it was Snowball who had destroyed the windmill…The animals knew that this was not the case." What kind of Irony is this?, Situational,Dramatic, or Verbal
December 15, 2011

Learning skills
Explain the SQR3 OF READING.
December 12, 2011

Learning skills
What are the advantages of study reading?
December 12, 2011

history
Thanks again
December 8, 2011

history
How did the use of advanced technology make World War II the most devastating war in history?
December 8, 2011

Science
thank you sooooo much!
December 8, 2011

Science
Was Daniel Bernoulli for the atomic theory or against it and explain why?
December 8, 2011

english
can anyone help me with explicationg act 3 scene 1 (setting) (charcater) (plot) (theme) of macbeth?
December 5, 2011

math
The force F (in Newtons) required to move a box of mass m kg in motion by pulling on an attached rope is F(x) = f m g/(cos(x))+ f (sin(x)) where x is the angle between the rope and the horizontal, f is the coefficient of static friction and g = 9.8 m/s^2. Find the angle x that...
November 17, 2011

Calculus
The answer might be easy if you told us the minimum height requirement. Since the ceiling is cheaper, the lower the height, the cheaper it will be. Once we know that, the squarer the building, As equal as possible in length & width, the smaller the perimeter and therefore the ...
November 13, 2011

Finance
Trying to figure out how to do problems like these. So confused! 1. The receivables turnover for 2009 is 10 times. 2. All sales are on account. 3. The profit margin for 2009 is 14.5%. 4. Return on assets is 22% for 2009. 5. The current ratio on December 31, 2009, is 3.0. 6. ...
November 13, 2011

calculus
Differentiate the function. h(x)= ln(x+ sqrt(x^2 -4))
November 9, 2011

chemistry
A student measures 0.2452 g of a monoprotic solid acid, and dissolves the solid in water to make 100.0 mL of solution. the entire solution is titrated to a phenolphthalein endpoint with 45.06mL of 0.1725M KOH. A. what is the molarity of the acid solution? B. what is the molar ...
November 9, 2011

Calculator Help
1. The csc^-1(1.23) I got 1.061 in radian mode 2. Cot^-1(-2.26) I got 0.8240 in radians 3. Cos^-1(-0.84) I got 2.568 Are these correct?
October 30, 2011

Physics
Sam, whose mass is 72.0 kg, takes off down a 51.0 m high, 11.0^\circ slope on his jet-powered skis. The skis have a thrust of 180 N. Sam's speed at the bottom is 43.0 {\rm m/s}. What is the coefficient of kinetic friction of his skis on snow?
October 24, 2011

algebra
Susie has a budget of $92 to spend on clothes. The shorts she wants to buy are on sale for $14 each. The shirts are on sale for $12 each. If Susie purchases four shorts, what is the maximum number of shirts she can buy to go with the shorts?
October 24, 2011

science
How much work does it take to raise a 3kg object 5m into the air? (a) What is the potential energy of the object when it is 5m in the air? (b) What does this tell you about the potential energy you get when you do work to lift an object? (c) If you drop the object, how fast is...
October 22, 2011

reading strategies
reading titles and headings,and trying to get an overview of what lies ahead in reading passageis called
October 22, 2011

science
A 4kg block is sitting on the floor. (a) How much potential energy does it have? (b) How much kinetic energy does it have? (c) The block is raised to 2m high. How much potential energy does it have? (d) The block is raised to 4m high. How much potential energy does it have? (e...
October 22, 2011

physics
as a baseball player strikes the ball with his batt the 1kg bat applies an average force of 250N on the .15kg baseball for .2 seconds. A) what is the force applied by the baseball on the bat? what is the acceleration of the baseball? C) what is the speed of the baseball at the...
October 20, 2011

physics
Standing on a balcony, you throw your keys to a friend standing on the ground below. 1.2 seconds after you release the keys, they have an instantaneous velocity of 15.4 m/s, directed 60° below the horizontal. What initial velocity did you give them?
October 18, 2011

History
what were 5 new weapons used in world war 1?
October 17, 2011

calculus
lim (9x^4+2x+1)^1/2/(3x^2+1) as x->-infinity
October 9, 2011

physics
A cube of aluminum is 4cm on each side.find the mass of the cube. (Density of aluminum is 2.7g/cm3
October 6, 2011

math
regroup 22: 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.
October 3, 2011

math
write three number sentences where difference is 50.
October 3, 2011

science
Steel expands 1 part in 100 000 for each 1°C increase in temperature. If the 1.5km main span of steel suspension bridge had no expansion joints, how much longer would it be for a temperature increase of 20°C?
October 2, 2011

chemistry
194
September 27, 2011

trig
A space shuttle 200 miles above the earth is orbiting the. Earth once every 6 hours. how far does the shuttle travel in one hour? Note the radius of earth about 4000 miles.
September 17, 2011

Math
around 55% exactly .5472
September 6, 2011

marketing
For business marketing, we are planning to make and sell soap, with our target audience as teenagers. What do you think we need to do in order to attract lots of customers and for them to sell?
August 31, 2011

science fair ideas
thank you both!
August 28, 2011

science fair ideas
What are some really good/cool science fair ideas?
August 28, 2011

physical science
I talked too my teacher over the this morning and he said that his question is written correctly but after i tried to tell him thats what proves the plate tectonic theory he said that i needed to research it more and re-evaluate my answer
August 28, 2011

physical science
One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?
August 28, 2011

science
please help!
August 27, 2011

science
One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?
August 27, 2011

alegbra
it may be a division as a one is overtop so the posibility is that the answer may be 6.5
August 27, 2011

math
i am good at math i go to school every day i love school so much i love my teacher and my school is name is sonoran sky
August 25, 2011

english
sir explain me about question tags..?
August 21, 2011

Biology
What is the primary focus on all biological studies?
August 11, 2011

math
A furniture store receives an invoice dated Sept. 27 for 5 bedroom sets at $3,000 each. The invoice indicated a trade discount of 5/8/3. The seller of the furniture prepaid the freight of $200. Terms were 2/10 EOM. Assuming Mel pays on Nov. 2, what amount would be paid. (Be ...
August 6, 2011

physics
A river flows at a uniform speed of 2ms-1 and is 100m wide. A motor boat has a maximum speed in still water of 7ms-1
August 4, 2011

statistics
You want to estimate the grades of st2%atistics students who gets grades of C or better. How many students should you survey to be 95% confident that the sample percentage is off by no more than 2 percentage points.
July 26, 2011

world history
How is the historical event of the 1981 Springbok Tour is, or was, of significance to New Zealanders.
July 3, 2011

chemistry
When magnesium is burnt completely in air the totol mass of the product was found to be grater than the original mass of the piece of magnesium.explain
June 14, 2011

statistics
A certain geneticist is interested in the proportion of males and females in the population that have a certain minor blood disorder. In a random sample of 1500 males, 75 are found to have disorder, whereas 80 of 2000 females appear to have disorder. Find a 90% confidence ...
June 3, 2011

statistics
It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. Random sample of 10 automobile owners are asked to keep a record of the kilometers they travel. If the sample mean and standard deviation of automobile driven are found to be 23,500...
June 3, 2011

statistics
A sample of 25 men has a mean weight of 65kg with standard deviation of 8kg. Suppose that the weight of men follows normal distribution with a standard deviation of 10kg. Find a 95% confidence interval for the population mean μ.
June 3, 2011

statistics
If 50% of the automobiles sold by an agency for a certain car are equipped with diesel engines, let X represent the number of diesel models among the next 5 cars sold by this agency, write the probability distribution of X.
June 3, 2011

MATH
553seven x 5seven
May 17, 2011

math
it costs $.20a min for ashley to call her best friend in mexico she calls her after school every day she called her friend @ 3:30 yesterday the cost was $8.60 what time did she end her call explain
May 10, 2011

university
Compare and contrast packet and circuit switching in 250 to 300 words. Which is more commonly used? What are the advantages and disadvantages of each?
May 9, 2011

science
what is the chemical equation for sodium nitrate?
May 8, 2011

Calc
this service is so nice make engineering services to coming education learning
May 3, 2011

math
what is tan p,out of p,8,q,6,r,and 10,in a fraction form?
April 21, 2011

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