Tuesday
October 25, 2016

# Posts by Clara

Total # Posts: 109

Physics
The size of Rutherford's atom is about 0.1 nm. (a) Calculate the attractive electrostatic force between an electron and a proton at that distance. (b) Calculate the electrostatic potential energy of that atom. Express the result in unit eV. (c) The size of Rutherford's...
March 13, 2016

Physics
What is the wavelength of light that can cause a transition of an electron in the hydrogen atom from the orbit with n = 6 to n = 8?(answer in µm)
March 13, 2016

English
I don't want to guess for you but I'm assuming that they should all make sense and mean the same? Maybe u can try substituting "I" for a name like John or something and then see if the sentences make sense? Hope this helps :)
March 8, 2016

Math
The Fiedler family has up to \$130,000 to invest. They decide that they want to have at least \$40,000 invested in stable bonds yielding 5.5% and that no more than \$60,000 should be invested in more volatile bonds yielding 11%. How much should they invest in each type of bond to...
March 7, 2016

U.S. History
I think you are correct. Im not a tutor though.
March 7, 2016

Math
total paid = 35 * number of months 700 = 35 * n so n = 700/35 Therefore, 20 months
March 7, 2016

Math
An artist is creating a mosaic that cannot be larger than the space allotted which is 4 feet tall and 6 feet wide. The mosaic must be at least 3 feet tall and 5 feet wide. The tiles in the mosaic have words written on them and the artist wants the words to all be horizontal in...
March 7, 2016

Science
consider a solid cylindrical disk rotating on an axis through its center. If the angular momentum of the disk increases, what can you conclude?
October 8, 2015

global warming
i have heard*
June 17, 2015

global warming
why do you have to shout i have people talk that global warming exist
June 17, 2015

global warming
What is the Cause of global warming
June 17, 2015

Chemisty
Balance TeO3^3- + N2O4 --> Te +NO3^- using oxidation numbers Need help A.S.A.P
June 15, 2015

Biology
How can the mass transfer kc and ultrafiltration solvent flux be increased? Select one: a. Another stream of fluid can flow adjacent to the membrane to accumulate solute at the membrane surface b. Another stream of fluid can flow perpendicular to the membrane to accumulate ...
May 23, 2015

Biology
Sorry I meant I'm not sure if cross-flow and perpendicular flow are the same thing.
May 22, 2015

Biology
Hi, one more question to clarify: How can the mass transfer kc and ultrafiltration solvent flux be increased? Select one: a. Another stream of fluid can flow adjacent to the membrane to accumulate solute at the membrane surface b. Another stream of fluid can flow perpendicular...
May 22, 2015

Biology
What is the osmotic pressure of the salt solution in reverse-osmosis? Select one: a. An equilibrium state where the amount of solvent passing in opposite directions is equal b. An equilibrium state where the amount of solvent passing in one direction is greater than other ...
May 21, 2015

algebra
The manager of the school cafeteria is planning a plate lunch. She can spend no more than \$2.00 per lunch and can choose servings from selections A and B. The table indicates the cost and the quantity of sugar and protein (in grams) per serving of each food choice. Food Cost ...
March 30, 2015

Physics
A 1800 kg mass car is traveling south at a velocity of 15 m/s through an intersection. It is hit by a 3500 kg mass car traveling east at 20 m/s. If the two cars collide and become one object (perfectly inelastic). What will be the final displacement of the cars after the ...
January 30, 2015

Physics
A 5 gram bullet is fired into a 7 kg ballistic pendulum suspended vertically from the ceiling. If the bullet embeds into the block and the two move as one to a new final height of 12 cm. What was the initial velocity of the bullet before impacting the pendulum?
January 30, 2015

maths
Given the demand function:p(x)=-0.5x+500 where p is price in RM per unit and x is the quantity demanded and the marginal costfunction C'(x) = -0.5-480, and the fixed cost =RM 900, find a) the level of production that will maximise profit b) the maximum profit c) the price ...
January 4, 2015

algebra
what is the error and the correction in finding the difference? 3/4 - 9/2 = 3-9 (4-2) = -6 / 2 = -3
December 8, 2014

Algebra 2
Solving By Factoring 4x(x-6)-x(x-2)=-24 Please show work!!!
November 8, 2014

Algebra 2
Solving By Factoring 6x^2-13x=-6 (x-8)(x-5)=x 4x(x-6)-x(x-2)=-24 Please show work I want to learn!!!!!!
November 8, 2014

algebra
n a survey of 60 randomly-chosen employees, 15 said they would prefer an hour for lunch with no breaks each day. 45 employees said they would prefer thirty minutes for lunch with two other breaks each day. If there are 500 people employeed by the company, predict the number ...
August 4, 2014

algebra2
Scores on a test are normally distributed with a mean of 75 and a standard deviation of 8. Estimate the probability that a randomly selected student scored between 71 and 75.
August 4, 2014

algebra
The table below gives the value of a car over two years. Using an exponential best-fit model, after how many years is the car valued at 25% of the original value? Year 0 0.5 1.0 1.5 2.0 Value (\$) 15,500.00 14,560.00 13,911.20 12,969.66 12,204.09
July 29, 2014

Physics
A 2.0 kg ball moving with a speed of 3.0 m/s hits, elastically, an identical stationary ball as shown. If the first ball moves away with angle 30° to the original path, determine a)the speed of the first ball after the collision. b)the speed and direction of the second ...
July 17, 2014

Intro to computer
B. An image file featuring the Windows 8 operating system
June 2, 2014

Chemistry
In the reaction C(s) + 2S(s) ¨ CS2(l), the change of enthalpy (ƒ¢H) is 89.3 kJ. Calculate the amount of heat absorbed when 6.33 g of carbon disulfide is formed.
May 14, 2014

Chemistry
How many kilojoules of heat are absorbed when 1.2 L of water is heated from 24oC to 86oC?
May 14, 2014

physics
this is a physics qustion im stuck on: ingrid holds the womans record time for a marathon race of 2h 21min 6s for 42.195km. The mens record is held by Blake grison of 2h 6 min 50s. If they had been in the same race how much would blake win by.. find this in time as well as ...
March 25, 2014

math
A local photocopying store advertises as follows. " We charge 9 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 210 , and 3 cents per copy for each copy 210 and above. " Let x be the number of copies ordered and C(x) be ...
February 12, 2014

math
Help please >.< The Hotel Lakewell has 450 rooms. Currently the hotel is filled . The daily rental is \$ 750 per room. For every \$ 4 increase in rent the demand for rooms decreases by 7 rooms. Let x = the number of \$ 4 increases that can be made. - What should x be so as ...
February 9, 2014

math
how to change 25 in a mixed number
February 6, 2014

Chemistry
Co-ordination number of Cr in dibenzene chromium is ??
April 16, 2013

The cell potential of the following electrochemical cell depends on the pH of the solution in the anode half-cell: Pt(s)|H2(g,1atm)|H+(aq,?M)||Cu^2+(aq,1.0M)|Cu(s) what is the pH of the solution if Ecell is 375 mV? I first got .65 as my pH, but it said that it was wrong. ...
March 30, 2013

Math
If it takes 4 minutes to fill a bucket with one tap and 6 minutes to fill the bucket with another tap. Using both taps how many seconds will it take to fill the bucket?
February 4, 2013

math
I don,t know
January 28, 2013

Math
#4: Correct B.
January 27, 2013

Math on time
So we know that Paige spends an equal amount of time on each subject. We also know that she studies Spanish for a half hour or 30 minutes. So what the question is really asking you is how many increments of 30 minutes are in a hour or 60 minutes. So what's 30/60?
January 27, 2013

Penn Foster
Its A! I love PF!
January 22, 2013

Algebra
Find the number of decibels for the power of the sound. Round to nearest decibels. A rock concert, 5.21 x 10^-6watts/cm^2 D= dB
November 3, 2012

math
a seismoraph 300km from the epicenter of an earthquake recorded a maximum amplitude of 5.4 x 10^2um. Find this earthquakes magnitude on the Richter Scale. (Round your answer to the nearest tenth). M=
November 3, 2012

algebra
1/3log(x)-log(10000)=4
November 3, 2012

social studies
Because/Even though children’s understanding of AIDS increases with age: A. AIDS education should not be attempted before adolescence. B. relatively young children can still grasp complex scientific concepts about disease. C. children in grades K-6 cannot even give a ...
October 8, 2012

social studies
Fran's little girl, Fifi, is a real tomboy. Fran asks you to explain why Fifi prefers rough play, boys' clothing and toys, and the company of boys to the company of girls. You believe in the biological explanation of gender development, so you will tell Fran that it is...
October 8, 2012

social studies
October 8, 2012

social studies
October 8, 2012

social studies
I read it over my notes again, and it is B.
October 7, 2012

social studies
I do, and I meant to say C.
October 7, 2012

social studies
Pookie is listening to music through headphones so that no one else can hear it. When Pookie's sister walks into the room, he says, "Sissy, do you like this song?" even though she cannot hear the music. Pookie's question indicates that he engages in which ...
October 7, 2012

social studies
Treasure claims that her 6-month-old baby, Precious, can add and subtract small numbers of objects. Recent research on infants' understanding of numbers would: A. indicate that Treasure is nuts. B. prove that Precious can add and subtract up to 20 objects. C. support ...
October 6, 2012

social studies
Results of Renee Baillargeon's sliding carrot research may suggest that object permanence: A. may not be present until much later than Piaget believed. B. may be present at a much younger age than Piaget thought. C. cannot be tested with violation-of-expectations methods. ...
October 6, 2012

social studies
Barbara's due date was over 2 weeks ago. Dr. Sally told Barbara that her baby is postmature, so she wants to induce labor. What is probably Dr. Sally's greatest concern regarding the health of Barbara's baby? A. The baby might be brain damaged. B. Barbara might be ...
October 4, 2012

social studies
Which one of the following babies is at greatest risk for SIDS? A. Alfred, who is 5 months old and had a difficult birth B. Mary, who is 2 weeks old and has irregular sleep patterns and an overweight mother C. John, who is 3 months old and has a teenage mother who smokes D. ...
October 4, 2012

social studies
Mary Lou must complete a research project to get her associate degree. She has just one year left to finish her degree and must spend as little time and money as possible on her research. She plans to compare stress levels of 8th graders to stress levels of 9th graders. What ...
September 27, 2012

social studies
The esteemed Dr. Bookworm has just completed a study in which he found a +1.0 correlation between the number of cups of coffee his students drank right before class and the scores they earned on his final exam. This correlation means that: A. the less coffee the students drank...
September 27, 2012

social studies
The right to __________ is not one of the ethical guidelines for research specified by the APA. A. financial compensation B. informed consent C. privacy and confidentiality D. avoidance of deception I cannot find the answer to this question.
September 27, 2012

social studies
Four-year-old Sergei can tell his Poppa how to wash the clothes. Yesterday, Sergei told Poppa, "First, get the dirty clothes from the basket. Next, put them in the washing machine. Now, add some soapy stuff. Close the washer lid and press the button. When the buzzer rings...
September 27, 2012

social studies
Four-year-old Sergei can tell his Poppa how to wash the clothes. Yesterday, Sergei told Poppa, "First, get the dirty clothes from the basket. Next, put them in the washing machine. Now, add some soapy stuff. Close the washer lid and press the button. When the buzzer rings...
September 27, 2012

social studies
An Li reached puberty at age 12, and John Smith retired at age 65. An Li's and John Smith's experiences are examples of: A. normative events. B. non-normative influences. C. critical periods. D. risk factors. I chose A. but now reading a little more into it, I'm ...
September 27, 2012

social studies
How many years can you expect to spend in retirement? A. 6 to 10 years B. 10 to 12 years C. 12 to 16 years D. from 16 to 25 years Is the answer C?
September 27, 2012

social studies
The people who are in the best position to save are: A. teenagers. B. young adults in their 20s. C. middle-aged. D. elderly I'm between C and D. Please help!
September 27, 2012

The average management fee for all mutual funds is: A. less than 0.25%. B. 0.25% to 0.50%. C. 0.50 to 1.25%. D. 1.25 to 2.50%. The answer I found is C, but I don't know if it is right.
September 27, 2012

I don't either, but I have to pick one. Which one do you think would be the best answer?
September 26, 2012

If creditors give you no credit for payments made during the billing period, this is called the: A. APR method. B. discount method. C. previous balance method. D. adjusted balance method. My choice is A, but Im a little confused.
September 26, 2012

If you think that your bill is wrong, you should first: A. contact the local credit bureau and inform it of the billing error. B. complain to the Better Business Bureau. C. contact your state consumer protection agency. D. notify the creditor in writing within 60 days after ...
September 26, 2012

Debt-to-equity ratio is: A. calculated by dividing total liabilities by net worth. B. calculated by dividing monthly debt payments by net monthly income. C. determined by dividing your assets by liabilities. D. rarely used by creditors in determining credit worthiness. My ...
September 26, 2012

An account at a commercial bank designed for people who want to earn a higher savings rate is a(n) __________ account. A. regular savings account B. regular checking C. share draft D. money market account My answer is D. Am I right?
September 26, 2012

I meant to say C.
September 26, 2012

Most people pay federal income tax by: A. paying the total amount owed by April 15. B. filing quarterly tax payments. C. having amounts withheld from income. D. earning tax credits for various deductions. I chose d. But I am not sure
September 26, 2012

phycology
Money management refers to: A. preparing personal financial statements. B. day-to-day financial activities. C. storing financial records for easy access. D. spending money on current living expenses.
September 26, 2012

math
Please show steps and give me explanations! Thank you. 1. If x=1/2, what is the value of 1/x+1/x-1 ? The answer is 0. 2. The sequence ZWYX may be changed in either two ways. Either two adjacent letters may be interchanged or the entire sequence may be reversed. What is the ...
July 26, 2012

algebra
mean is 20; 6,22,7,36,x what is the value of x
March 22, 2012

Nursing
functional health assessment on movie chareacter "my sister's keeper"
February 17, 2012

wchs
A checkerboard measures 144 square inches. What is the length of a small square on its side? Hint: It has 8 squares per edge.
January 30, 2012

algebra
lean can paint her new apartment 3 hours longer than his friend,carlos.if both can do painting in 2 hours,how long will it take each one to finish the job alone?
January 5, 2012

Math Finance
How much interest does \$2560 earn in 17 months at a rate of 5 1/8 ?
January 2, 2012

math
SWITCH IT WITH 0.75?
December 11, 2011

math
least to greatest 0.75, 0.39, 0.2, 0.35 i think its 0.2, 0.35, 0.75, 0.39
December 11, 2011

Chemistry
Consider the following reaction: C6H5CL+C2HOCL3=>C14H9CL5+H20 If 1142 g of C6H5CL is reacted with 485 g of C2HOCL3, what mass of C14H9CL5 would be formed?
November 21, 2011

chemistry
Consider the following reaction: C6H5CL+C2HOCL3=>C14H9CL5+H20 If 1142 g of C6H5CL is reacted with 485 g of C2HOCL3, what mass of C14H9CL5 would be formed?
November 20, 2011

math
Suppose you borrow \$12,000, which you must pay back in 30 equal monthly payments, each of which includes a .8% interest charge on the unpaid balance. a) How much will you need to pay each month? b) How much money did the bank make on this deal?
November 14, 2011

Math
The domain of a function, f(x), is all numbers between -1 and 6, inclusive. The range of this function is all numbers between 0 and 12, inclusive. a) What is the domain of .5f(3x)? b) What is the range of .5f(3x)?
November 14, 2011

math
Thanks, how much money will the bank receive at the end of the 13 years?
November 14, 2011

Englisch
Can somebody help me to write a summary? The article "Towards a greener Economy?, written in 2009 by friedman, deals about the economic system in unsustainable. The satirical newspaper decribe the americans are wasteful. Than i don't know how can i write the rest of ...
September 20, 2011

Geography
You and your partner are considering opening eight new upscale department stores in Nicaragua. Would your stores most likely do well or fail in this region? Explain your answer.
May 4, 2011

geometry
Find the length of the median of a trapezoid with vertices at C(3,1) D(10,1) E(7,9) and F(5,9)
March 16, 2011

math
what is a communitative property
November 2, 2010

economics
A- give them to a specific group, such as high-risk populations. yes I would allow those individuals allocated to vaccine to sell their dose to someone else.
September 19, 2010

chemistry
3. Using the coefficients in the balanced equation, convert moles Sb2S3 to moles Sb. i don't get this step?
March 31, 2010

chemistry
Heating an ore of antimony (Sb2S3) in the presence of iron gives the element antimony and iron(II) sulfide. Sb2S3(s) + 3 Fe(s) 2 Sb(s) + 3 FeS(s) When 10.9 g Sb2S3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the percent yield of this reaction?
March 31, 2010

English
I'm writing a persuasive essay about how women with HIV should not be allowed to have children. Can you please help me find some reliable sources about my topic? Thank you.
February 22, 2010

math
Krista has \$0.85 in nickels and dimes. She has 2 more nickels than dimes. How many nickels does she have?
January 24, 2010

spanish
To a point yes. They are both past forms of show but one is group ownership translating as they showed while the other translates as it showed. Remember the basic rule of spanish on translations and the difference in which is which should come to you.
May 30, 2009

spanish
Due to the number of postings that you have on Spanish, it seems that you are at the wrong level to make these translations. Request to go back a level; otherwise, help from this site may decrease. Overall this loosely translates as follows in English - Would you show your Ana...
May 30, 2009

spanish
English translation is "When it rained last night, all lights went out of the house and I could not see anything! What a pity! You must have a flashlight with good _____ emergency." Which of the options would make sense in the blank? a. Batteries b. coins c. keys d. ...
May 30, 2009

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