Friday
November 28, 2014

Posts by Mark


Total # Posts: 1,264

English - Native speakers
Is it better to use a little or little in the following example? If you have__________ time could you come and help me do my homework
June 23, 2011

English - Native speakers
can we use here a lot of hope?
June 23, 2011

English - Native speakers
Can we say : Scientist have a little hope of finding a cure for cancer or little hope.Can we say both? A little means positive and little negative
June 23, 2011

English-Native speakers
Is a producer synonym for a director?
June 23, 2011

English vocabulary
Is the synonym for: to have a leading role=to star
June 23, 2011

English Passive
Can you put this sentence in passive Her mother is teaching her French
June 23, 2011

English Passive
Can we say in passive: The bad news were or was given? The same with cast has been chosen or have been chosen?
June 23, 2011

English question tags
Why is the following sentence correct: Nobody is indispensable, is he? Why he? Which question tag can we use here?
June 23, 2011

English-Native speakers
Why do we use definite article in the sentence: I went to the airport at 8 o'clock. when this airport is mentioned for the first time?
June 23, 2011

English third conditional
Hello! For example we have a sentence If you________ (not/be) late, we____________(not/miss) the bus. Is it correct to say If you hadn't been late, we wouldn't have missed the bus? Can we write would have not missed? This is wrong right?
June 23, 2011

General Chem
What do you call a solution that is maid by mixing solid Na2S2O3 5H20 with NaOH? Also, what is the complete balanced equation for mixing the above solution with an aqueous solution of NaClO? Thanks anyone!
June 22, 2011

math
my tens digit is 5 more than my ones digit and 2 less than my hundreds digit.if the sum of my digit is 18.what number am i?
June 22, 2011

English - Native speakers
One question: The rule says the we use the definite article with ordinal numbers.I have just seen the example saying "a second letter". Is there some rule when to use it and when not to?
June 16, 2011

English - Native speakers
Hello! I know articles are really complicated in English language but what is the easiest way to explain the usage of definite, indefinite and zero article?
June 16, 2011

English - tenses
Thank you both :)
June 13, 2011

English - tenses
About that May-I agree with both of you. But this sentence about the manager is supposed to be filled with either will arrive soon or is arriving soon (I would fill it in with will arrive but the correct answer is is arriving soon (I accidentally involved going to future in ...
June 13, 2011

English - tenses
Ok to conclude: Is when in the first sentence synonym for after? If it is then I am clear about the past perfect How would you as a native speaker (I guess :)) explain to me when to use Simple Future and when Going to future?
June 13, 2011

English - tenses
Yes, I would also use past continuous. One more question. Is it correct that we use Going to Future when we are more sure that something is going to happen and Simple Future when something is not so sure and things can change? If this is correct why is this sentence correct: ...
June 13, 2011

English - tenses
Why is this sentence correct - concerning tenses I did my homework when I had watched TV. Does this mean that person did her/his homework after watching the Tv?
June 13, 2011

bio
Explain how genetic diversity in plants and animals supports long-term viability.
June 11, 2011

English - Native speakers
Hello! What is the difference between switch off the TV and turn off the TV?
June 9, 2011

math
automoniles arrive at the drive-through windom at a post office at the rate of 4 every 10 minutes. the average service time is 2 minutes. the poisson distributimes are exponentially distributed. (A) what is the average time a car is in the system? (b) what is the average ...
June 7, 2011

law
In the video game Corporate Cowboy, your task is to investigate complaints of wrongdoing on the part of corporate directors and officers, decide whether there is a violation of the law, and deal with the wrongdoers accordingly. Jane, a shareholder of Goodly Corporation, ...
June 7, 2011

English - Native speakers
Hello! Can you improve this sentence please "She didn't ask her supervisor days-off."
May 26, 2011

Chemistry
When 0.5963g of a sample containing NaNO2 and some inert material is allowed to react with excess HSO3NH2, the volume of N2 gas produced is measured. The volume of N2 gas corrected to 298.15K and 100kPa is calculated to be 0.146L. Find the mass percent of NaNO2 in the sample ...
May 25, 2011

msth
you are planning for your kids future education. he is 8 years old now and will start in ten years. How much will you have to set aside each year in order to have 65,000.00 if the interest rate is 7%.
May 22, 2011

math
what will a deposit of 4500 be worth if left in the bank for 5 years at 8% compounded quarterly?
May 22, 2011

Chemistry
A glass of ice water was made by adding six 25 g ice cubes to one liter of water. If the water was initially 25C and the ice cubes were initially at -15C, what is the final temperature of the ice water?
May 20, 2011

English - Native speakers
Hello! Can we say the following "The three of them are the best of friends" the best of friends?
May 17, 2011

physics
juana slides a crate along the floor of the moving van the coefficient of kinetic friction between the crate and van floor is 0.120 the crate has a mass of 56.8 kg and juana pushes with horizontal force of 124 N. if 74.4 J of work are done on crate and the delta x is 1.3m. ...
May 11, 2011

Physics
juana slides a crate along the floor of the moving van the coefficient of kinetic friction between the crate and van floor is 0.120 the crate has a mass of 56.8 kg and juana pushes with horizontal force of 124 N. if 74.4 J of work are done on crate and the delta x is 1.3m. ...
May 11, 2011

physics
When combined together, what is the weight (NOT MASS) of the moving pucks?
May 5, 2011

English-Native speakers
Ok one maybe weird question. If Susie is married to Bruce now and they have a son whose name is Edward, what is Edward to Susie's ex-husband Robert(with whom she has 2 children)? Robert is Edward's what?
May 1, 2011

English-Native speakers
Is glasses only a plural noun? We can't say a glasses right? What about a matches and a tissues?
May 1, 2011

Math
How do you put 7x= 3y-12 in y=mx+b form?
April 26, 2011

English - Native speakers
Is it correct to say Is he at work now or Is he now at work?
April 25, 2011

English - Native speakers
Thank you :) Don't we use hate only with ing? I hate to eat is also correct?
April 25, 2011

English - Native speakers
Can you please correct these sentences(concerning grammar) We should reduce a politician salary. I hate to eat sweets because it is not good for my teeth. I am going to ban her computer games. I work only a few hours for a month. My salary is going to reduce. He was a judge in...
April 25, 2011

physics
A .095kg aluminum sphere is dropped rom the roof of a 45m building.If 65% of the thermal energy produced when the sphere hits the ground is absorbed by the sphere, what is its temperature change?
April 24, 2011

physics
A cube of ice is take from the freezer at -8.5C and placed in a 95g calorimeter aluminum cup containing 310g of water at 20degC. The final situation is observed to be all water at 17degC. What was the mass of the ice cube?
April 24, 2011

physics
What will be the equilibrium temperature when a 245g block of copper at 285 degrees C is placed in a 145g calorimeter aluminum cup containing 825g of water at 12 C ?
April 22, 2011

plz help
10
April 20, 2011

plz help
Southern latitude range of Brazil, south America
April 20, 2011

Science/ geography?
50?
April 20, 2011

Science/ geography?
I don't get the south latitude
April 20, 2011

Science/ geography?
8 S?
April 20, 2011

Science/ geography?
60 N, 60 S?
April 20, 2011

Science/ geography?
Is that all Brazil?
April 20, 2011

Science/ geography?
What is the latitude range for Brazil, South America?
April 20, 2011

statistics
24
April 20, 2011

statistics
What is the third quartile, Q3, of the following distribution? 27, 18, 20, 21, 29, 33, 12, 14, 34, 10, 16, 21, 22, 24, 26 A. 24 B. 18 C. 27 D. 4 E. 31
April 20, 2011

Math
Oh sorry 246 marables
April 19, 2011

Math
Liz, jas and Sam each have a collection of marbles. The three of them pool their marbles to make a larger collection. They weigh the marbles on a postal scale. Together they have 2$6 marbles which.weigh 183 ounces. What is the average weight(unit rate) of each marble?
April 19, 2011

physics
Thanks
April 19, 2011

physics
A storage tank at stp contains 18.5kg of nitrogen. What is the volume of the tank and what would the pressure be if you added another 15kg of nitrogen at the same temperature?
April 19, 2011

physic
c) Given these views of Darwin, we can derive an expectation of the ratio of transitional to non-transitional fossils found. I include in the following only those factors which yield a differential expectation of discovery of transitional fossils displaying the action of ...
April 16, 2011

physic
Given these views of Darwin, we can derive an expectation of the ratio of transitional to non-transitional fossils found. I include in the following only those factors which yield a differential expectation of discovery of transitional fossils displaying the action of natural ...
April 16, 2011

English - Native speakers
Ok and the last one. Is there a singular form of sheets? Do we say change your sheets? (sheets on the bed, not a sheet of paper)
April 14, 2011

English - Native speakers
Can we then say He may have come yesterday or just He might have come yesterday? Can we use may in the past tense or not?
April 14, 2011

English - Native speakers
Ok thank you both :) One more question. Is might the past form of may?
April 14, 2011

English - Native speakers
Yes thank you and is there a singular a toiletry or just plural toiletries?
April 14, 2011

English - Native speakers
Hello! What does toiletries mean? Is this stuff we use in our bathroom e.g. toothbrush, comb etc. or is this a perfume but with higher percentage of water?
April 14, 2011

English - Native speakers
Hello what is the difference between a supermarket and a market a chemist and a pharmacy a shopping centre and a department store a shopping centre and a shopping mall
April 12, 2011

Calc
[9:52:53 PM] Pardeep Narang: y''+2ty'−4y=8 y(0)=4 y'(0)=0 i need to solve this using laplace transforms
April 11, 2011

geometry
in a regular polygon, with center O, and a side AB, measure of angle AOB =72 degrees. If AB is 4.6 in. find the perimeter
April 10, 2011

physics
Thanks, very much.
April 9, 2011

physics
The gauge pressure in each of 4 car tires is 240kpa. If each tire has a footprint of 220cm^2 , what is the mass of the car?
April 9, 2011

Physics
A raindrop (mass 1.00 g) is travelling at a speed of 40m/s when it hits the surface of 100 g of water contained in a drinking glass. What is the change in temperature of the water in the glass if we assume that a) all the kinetic energy of the raindrop is converted to energy ...
April 7, 2011

anatomy
Compare and contrast the two feedback mechanisms our bodies use to maintain homeostasis what would happen if our thermoregulation used positive feedback to maintain homeostasis
April 6, 2011

English - Native speakers
Ok I got confused How to solve the following example? My brother__ wife__ name is Pauline. Where do we put possessive s???
April 6, 2011

English - Native speakers
Helo :) Can you tell me if the following explanation of mine concerning possessive s is correct? We put 's with every noun in singular (my mother's house)and when we have irregular plurals (this is my children's school) We put just the apostrophe when we have ...
April 6, 2011

English - Native speakers
Another one! Why can't we say this stain remover is very efficient. Why do we say effective? What is the difference? What are facilities and what amenities? When do we use specimen and when sample?
April 5, 2011

English - Native speakers
Hello what is the difference between a chef and a cook? Another question: If we have a sentence: It is mary's and john's birthday today do we put apostrophe where I put it? Can we say: He said in he camera or he said to the camera? (On TV) Do we say he lied on the bed ...
April 5, 2011

Chemistry
Thanks!
April 3, 2011

Chemistry
Vinegar is a dilute solution of acetic acid. In the titration of 5.00 mL of vinegar, 39.75 mL of 0.137 M sodium hydroxide solution was required to neutralize the vinegar to a phenolphthalein end point. Calculate each of the following of the vinegar. (a) the molarity : I got 1....
April 3, 2011

Chemistry
A 22.3 mL sample of a weak monoprotic acid, HX, requires 50.0 mL of 0.040 M NaOH to reach the equivalence point. After the addition of 30.0 mL of NaOH, the pH is 5.30. What is the Ka of HX?
April 3, 2011

physics
Thanks , I knew this just didn't seem right.
April 2, 2011

physics
A 33kg traffic light hangs from a vertical beam by two wires. The wire on the left side of the light has an angle of 53 degrees to the beam and the right side wire has an angle of 37 degrees with the beam. Calculate the tension in each of the wires. Would the tension just be ...
April 2, 2011

math
Chords AC and BD intersect at the center of circle ABCD. If the length of CP = 8, which is the length of PB?
March 31, 2011

English - Native speakers
Hello! How do you call a person who checks if passengers in buses or trains have tickets? It is not a conductor right? Conductor is a person who conducts an orchestra. Another question: How do you call the woman who is helping a woman to give birth? and do you say indefinite ...
March 31, 2011

math
3 1/5 x 2 5/6 express in simplest form
March 30, 2011

English - Native speakers
So you don't write :I live in the North?
March 30, 2011

English - Native speakers
Do you write North South East West with a capital letter? Why do you write then: He lives in north London?
March 30, 2011

physics
A merry-go-round of mass 1640kg has a radius of 7.5m. How much work is required to accelerate it from rest to a rotation rate of 1 rev. per 8 seconds? (assume a solid cylinder) /
March 29, 2011

English - Native speakers
Than you :) And what about this one: On TV had said that it is going to rain
March 29, 2011

English - Native speakers
I have couple more sentences: when we heard unusually dog barking. Can we better say when we heard unusual dog barking or unusual barking of a dog. do we say the dog was barking crazy or like a crazy? He was trying to explain us something or to us something? car was empty of ...
March 29, 2011

English - Native speakers
How would you correct this sentences? It should have been a day just like other days.A usual day
March 29, 2011

English - Native speakers
Thank you :)
March 29, 2011

English - Native speakers
Hello! Can we say: Are you going to apply to a job soon? or is apply for a job more correct? In which cases can we say apply to?
March 29, 2011

physics
A 650g ball on the end of a light rod is rotated in a horizontal circle of 1.2m radius.Calculate the torque needed to keep the ball rotating if the air resistance exerts a force of .02N on the ball. Ignore the moment of inertia and the air resistance of the rod.
March 27, 2011

grade 9 polynomials
Yes , but 39s
March 27, 2011

grade 9 polynomials
Multiply the # outside the parenthesis by each item inside the parenthesis to remove the parentesis and then combine the like terms (r's & s's).
March 27, 2011

English - Native speakers
Hello! Is it correct to say He watches sport on TV or he watches sports on TV. What is the difference?
March 27, 2011

physics
How can I convert 0.06981 radians/ sec^2 to rpm?
March 26, 2011

science
Magnetic field?
March 25, 2011

physics
A centrifuge takes 1 minute to turn through 20 complete revolutions before reaching it's final speed. What is the angular acceleration (assumed constant) and what was it's final angular speed in rpm? How do I solve this without knowing the radius of the centrifuge?
March 25, 2011

English - Fools Crow
Yes you did :) I just wasn't sure what exactly is the plural. I knew the singular was A French :) Thank you and I'll be back :)
March 24, 2011

English - Fools Crow
It is not an error since it is used 5 times. But it is probably your above explanation! So is the group which is learning English from the beginning now at the first degree or class or level? What is correct? I have another question. Is the plural from a French the French or ...
March 24, 2011

English - Fools Crow
This example We're in Class 2 is written in the student's book (english as a foreign language- elementary level) It is used as an example of the Present Simple Tense. So how to explain this word? It is obviously not the classroom. Could it be for example Class 1, Class...
March 24, 2011

English - Fools Crow
Oh interesting! But when this word refers to classroom, to pupils what's the explanation then?
March 24, 2011

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