Friday

October 9, 2015
Total # Posts: 2,545

**Physics**

The work function for potassium is 2.24eV. If potassium metal is illuminated with light of wavelength 310 nm, find the maximum kinetic energy of the photoelectrons. I have tried everything and still keep getting the wrong answer. The speed of light is 3 × 108 and Planck...
*April 13, 2010*

**fraction comparisons**

Max did 19 situps. This is 1/7 as many as Isabel. How many situps did Isabel do?
*April 12, 2010*

**chemistry**

help me. i dont understand
*April 11, 2010*

**chemistry**

Excess florine, F2(g) reacts at 150 degrees celius with bromine, Br2(g) to give the compound BrF(n). If 423 mL of Br2 at 150 Degrees and 748mmHg produced $.20 g BrF(n), what is it? describe the bonding in the molecule, using valence bond theory.
*April 8, 2010*

**grammer**

Yesy the correct one is 3. The conjunction in that sentence is for. A conjunction links sentences together. There is always a comma before a conjunction.
*April 8, 2010*

**geometry**

y= 24
*April 8, 2010*

**MATH**

It is a well-known fact that homing pigeons fly faster over land than over water. Assume that they fly at 10 metres per second over land, and only 8 metres per second over water. A pigeon is located at the edge of a straight river bank, 500 metres wide, and must fly to its ...
*April 8, 2010*

**geometry**

If a circle has a diameter of 2 3/8 inches, then what is the length of the radius?
*April 5, 2010*

**algebra **

Find the minimum and maximum values of the objective function subject to the given constraints? Objective Function: C=4x+5y Constraints: x>=0, y>=0, x+y<=6
*April 4, 2010*

**math**

you work at a grocery store. your hourly wage is greater after 6pm than it is during the day. one week you work 20 daytime hours and 12 evening hours and earn $280. another week you work 30 daytime hours and 12 evening hours and earn a total of %276. what is your daytime rate...
*April 2, 2010*

**math**

during a recent telethon people pledged $25 or $50. twice as many people pledged $25 as $50. altogether, $18000 was pledged. how many people pledged $25?
*April 2, 2010*

**Help me think of ideas for my essay?**

My thesis statement for my synthesis essay to connect The Grapes of Wrath, The Great Gatsby and The Death of a Salesman is "It is impossible to maintain honor and also achieve success." Could anybody give me any ideas for my 3 body paragraphs I'm having trouble ...
*April 1, 2010*

**Chemisty**

calculate pH of 50.0 mL of a .100 M solution of the weak monoprotic acid HX
*March 29, 2010*

**Chemistry**

When you balance equations, do you treat polyatomic ions as one unit or treat the different elements in the ion separately? Because if you treat them as one unit, then what if the elements get separated in the products side of the equation?
*March 27, 2010*

**Physics**

i need help on this problem too
*March 26, 2010*

**9th grade**

soil dwelling insects are examples of invertabrates. explain why this statement is true and use examples of two soil dwelling insects
*March 23, 2010*

**Civics**

Are there any reliable websites that would give information and statistics on improvements that should be made to Immigration Canada?
*March 21, 2010*

**science**

I am doing a project on the Silurian time period and we need to know some organisms that were created during the time and some that went extinct. I found a bunch that were created but i didnt find any that went extinct!! Help!!
*March 16, 2010*

**math**

5 x (x + 2y) - (5x +2y) + y(2x + z) translate into a word phase.
*March 12, 2010*

**physics**

A 250. MW coal-fired power plant burns fuel with an energy density of 35.0 MJ kg-1. Water enters the temp reduction tower at 293 K and leaves at 350. K at a rate of 4200. kg s-1. 4. Calculate the energy removed by the water each second. 5. Calculate the energy produced by the ...
*March 11, 2010*

**4gr math**

6/87
*March 7, 2010*

**4th grade math**

write and solve a mixed number word problem
*March 4, 2010*

**fractions **

Claire cut some apples into eights. She ate all but 17 pieces. how many whole apples and parts of apples did she have left over?
*March 3, 2010*

**fractions**

Castor brought 6 3/4 cakes to share with 26 students. Did Castor bring enough for each student to have 1/4 of a cake? Explain your thinking and show your work
*March 2, 2010*

**Math Analysis**

From a ship off-shore, the angle of elevation of a hill is 1.1°. After the ship moves inland at 4.5 knots for 20 min, the angle of elevation is 1.4°. How high is the hill? (1 knot = 1 nautical mile = 6080 ft per hour) As I was just about to get the answer, I realized ...
*March 2, 2010*

**4th grade**

4/5682
*March 1, 2010*

**science**

I figured out the other three questions but im stuck on this one... If you digest an entire human genome with a restriction enzyme you get a blurry smear in the lane of the gel. Why?
*March 1, 2010*

**science**

What type of organism makes restriction enzymes? How did restriction enzymes evolve? How do scientists use restriction enzymes? If you digest an entire human genome with a restriction enzyme you get a blurry smear in the lane of the gel. Why? I have a quiz tomorrow on ...
*March 1, 2010*

**6th grade**

Cone u
*February 24, 2010*

**english**

"There" is defined as "at or in that place." ex. Sit over there. "They're" is a contraction of the two words "they are." ex. They're sitting on the bench. "Their" is the "possessive form of 'they'." ex...
*February 23, 2010*

**Honors Chemistry**

How does heating or boiling a substance affect its pH?
*February 23, 2010*

**pre calc**

You're correct about the numerator. You would simplify the denominator to be x(x-1). So now you have: x(x+2) ------- x(x-1) You can cancel out the x's on both the numerator and denominator, and so for your final answer you would have: (x+2) ------ (x-1) Does this make ...
*February 23, 2010*

**Algebra 2**

Both the numerator and denominator have the same bases for the exponents, right? So, dividing these two variables is the same as subtracting the exponents, like: n^(3-¨i)
*February 23, 2010*

**Honors Chemistry**

Ohhh I see. This makes more sense. Thank you! :)
*February 23, 2010*

**Honors Chemistry**

If 20 mL of 0.01 M aqueous HCl is required to neutralize 30 mL of an aqueous solution of NaOH, determine the molarity of the NaOH solution. ==> I got 0.01 M NaOH as my answer. Is this correct?
*February 23, 2010*

**Honors Chemistry**

I don't exactly understand this question -- can someone maybe explain it to me please? 6) Suppose you have an NaOH solution of unknown concentration. Name three possible substances that could be used in "known" solutions to titrate the NaOH solutions.
*February 23, 2010*

**Math**

In right triangle ABC, altitude CD is drawn to hypotenuse AB. If AD equals 4 and AC exceeds DB by 1, find DB. It is from a worksheet about proportions in a right triangle.
*February 21, 2010*

**pre-Algebra**

Sorry, struggling through pre-Algebra .. :-( .. How do i figure out 5x = -20 ?
*February 19, 2010*

**Pre-Algebra ... again :-(**

Thank you Miss Rose!
*February 19, 2010*

**Pre-Algebra ... again :-(**

How do i go about finding the integers of a product and quotient ... like, product of -20 whose quotient is -5 ..... thanks again
*February 19, 2010*

**Math Pre-Algebra**

Gotcha ... makes sense to me! :-) ... thank you! ... i may be back! :-)
*February 19, 2010*

**Math Pre-Algebra**

What is the value of 1 raised to a negative exponent? ... Maybe an example would help me better understand. Thank you very much ... I know it is like a fraction
*February 19, 2010*

**Data management**

The camera club has 5 members, and the math club has 8 members. There is only one member common to both clubs. In how many ways could a committee of 4 people be formed with at least 1 member from each group?
*February 17, 2010*

**chemistry**

is the correct answer 68.93kJ?
*February 16, 2010*

**chemistry**

Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/g°C, calculate the total ...
*February 16, 2010*

**chemistry**

What quantity of heat is required to vaporize 32.5 g of liquid water at 100°C?
*February 16, 2010*

**Ecology**

How does the skin and life cycle of a frog help indicate the health of local ecosystems?
*February 13, 2010*

**cal 2**

Find the number b such that the line y = b divides the region bounded by the curves y = x2 and y = 16 into two regions with equal area. (Round your answer to the nearest hundredth.)
*February 12, 2010*

**Science**

Plants, cows and humans use the same amino acids to make up their proteins and yet the proteins are very different. Why?? Could a plant make a human protein if we could splice a human protein gene into the plant's genome? Why? ----Those questions are from a lab we did, i ...
*February 11, 2010*

**English**

We are doing this group project where we have to teach the class our vocab words. My job for the project is to make big flashcards with pictures of the words on it. One of the words is vignette, and I have no idea what picture to use, the definition is short verbal description...
*February 10, 2010*

**gr. 10 physics **

I must find the speed of an object, the infermation that is given to me is:n height: 0.10 kinetic energy: 0.50 time travel o.72 (m/s squared). i belive that speed = 0.3... is this correct?
*February 9, 2010*

**Yr 10 English - Poetry**

What were the hobbies (if any) of Nobel Prize winning poet Seamus Heaney? I searched everywhere and couldn't find anything. . .
*February 8, 2010*

**algebra**

x - = 12 3
*February 3, 2010*

**English- Mrs.Sue Please**

Hello Im am stuck on these sentence things and we have to say if it is a preposition, verb, pronoun, conjunction ect. what do I do?
*February 1, 2010*

**Spanish **

how do you make comparisions use equality and superlatives?
*January 26, 2010*

**CP Science 9th grade**

A Sample of Air at 35 degrees Celsius has a relative humidity of 15%. How do you find the dew point temperature?
*January 26, 2010*

**FIN200- FV, PV and Annuity Due CP**

Take the $95. Assuming you take the $95 and compound it daily at an annual rate of 12% for 50 years you would have $38,287.96 which is obviously more than $30,000.
*January 26, 2010*

**Literary Analysis and Composition**

Hey, I was trying to figure out some similarities between the Stories Barrio Boy by Ernesto Galarza and No Gumption by Russell Baker. I got some, but I am supposed to make a four paragraph essay out of it. It would be great if you could list some similarities and differences. ...
*January 22, 2010*

**Literary Analysis and Composition**

thanks! i got a B+ (88.2%)
*January 21, 2010*

**Literary Analysis and Composition**

Sorry, Apparently the last post i did didnt show my selections. Please check these answers for me. Thanks 1. Works such as "To Build a Fire" gave Naturalist writers such as Jack London a platform to argue that (Points: 5) human wisdom ingenuity can solve all problems...
*January 21, 2010*

**Literary Analysis and Composition**

Could you check my work for me? and please hurry, i have 40 minutes left to complete. Thanks so much! 1. Works such as "To Build a Fire" gave Naturalist writers such as Jack London a platform to argue that (Points: 5) human wisdom ingenuity can solve all problems. ...
*January 21, 2010*

**Literary Analysis and Composition**

Could you please check my answers? Thanks! 10. Identify how each gerund or gerund phrase is used in the sentence. All units will remain here for processing. (Points: 3) subject direct object predicate nominative X object of a preposition 11. Identify how each gerund or gerund ...
*January 20, 2010*

**Literary Analysis and Composition**

Please help me out with this question! I am still trying to understand participle phrases. Write the first and last word of the participial phrase. We studied the notes, including all the lectures and outlines.
*January 20, 2010*

**social studies**

how did geography affect the italian peninsula?
*January 14, 2010*

**Precalculus**

Can someone check my answers please? Thank you :) 30. What is Earth's rotational speed at (a) Bangor, Maine (latitude 45 degrees N) and (b) Rio de Janeiro, Brazil (latitude 23 degrees S)? (It's given in the problem also that Earth's rotational speed at the equator ...
*January 13, 2010*

**Math Analysis**

What is the approximate horizontal distance traveled by a soccer ball that is kicked at an angle of 30 degrees with an initial speed of 60 feet per second? a) 84 ft b) 88 ft c) 93 ft d) 97 ft e) 105 ft ==> I tried solving it by solving for x in the equation cos30 = x/60, x ...
*January 10, 2010*

**algebra**

How do you write equations for 4 lines that intersect to form the sides of a parallelogram? What must be true about such lines?
*January 10, 2010*

**Geography**

Ms. Sue sounds like she was having an off day... ^^^
*January 7, 2010*

**MATH!! **

The slope of a line segment AB is 2. The coordinates of the endpoints of the line segment are A(-2,11) and (X,7). Determine the value for X.
*January 7, 2010*

**Math Analysis**

Ohhhhhh I get it now! I was imagining the scenario in a completely different way. Thank you!
*January 6, 2010*

**Math Analysis**

What is the apparent size of an object 1 cm long held 80 cm from your eyes? ==> When they say "apparent size", they mean the angle from which one object is viewed by, say, a person (or in this case a pair of eyes). I thought I'd be able to find the angle by ...
*January 6, 2010*

**English**

Thank you so much Ms. Sue!!
*January 5, 2010*

**English**

I need help with prepositional phrases. I’m given sentences and I’m supposed to rewrite them changing the position of the prepositional phrases so that the sentences are not confusing. If they are already correct, I’m supposed to write correct. I made ...
*January 5, 2010*

**English**

I need help with prepositional phrases. I’m given sentences and I’m supposed to rewrite them changing the position of the prepositional phrases so that the sentences are not confusing. If they are already correct, I’m supposed to write correct. I was wondering ...
*January 5, 2010*

**10th grade**

I am writing an essay on things from the natural world and I need to think of categories for the things in order to write paragraphs. The sun, moon, sea, and sea shore are all things from the natural world. What one smaller category do they fit in?
*January 3, 2010*

**English**

I am writing an essay on things from the natural world and I need to think of categories for the things in order to write paragraphs. The sun, moon, sea, and sea shore are all things from the natural world. What one smaller category do they fit in?
*January 2, 2010*

**Pre Cal**

If log 3=A and log 5=B express Log 75 in terms of A and B. (using the Law of Exponents)
*December 22, 2009*

**Precalculus**

If f(x) = ab^x where a > 0, b > 0, and b is not equal to 1, then b is called the _______________ of the exponential function. Any help is greatly appreciated!! :)
*December 14, 2009*

**Math**

It helps to draw out what the photo in the frame will look like, so you'll draw a rectangle with length "L" and width of "L + 2" (because it says the width [think w] is 2 more than the length "L"). Now, it says a border of 1 in. is placed ...
*December 14, 2009*

**3rd grade math**

explain how to use multiplication to convert yards to feet
*December 10, 2009*

**Math -- HELP!!!!**

y + 5y = 90 6y = 90 y = ? Divide each side by 6 and you get your answer.
*December 10, 2009*

**Math Analysis**

31. Radioactive decay of material is determined using the formula N = Noe^-kt. Find the constant k for Plutonium-239 given that its half-life is 24,390 years. ==> I don't really get where to start here because the problem does not give you how much Plutonium-239 there ...
*December 10, 2009*

**math**

What's your question?
*December 10, 2009*

**math**

You're welcome! :)
*December 10, 2009*

**math**

I mean the piece he has is 1/2 yard long, not half of the 3/4-yard one. oops sorry! lol
*December 10, 2009*

**math**

Yep! :)
*December 10, 2009*

**math**

Multiply 3/4 by 2/3 to get the piece Robert needs: (3/4) * (2/3) = ? If you don't have a calculator, cross multiply so the 3s cancel out and the 2 goes into the 4 twice...leaving you with an answer of?
*December 10, 2009*

**math**

An ordered pair consists of an x-coordinate and a y-coordinate, like (x,y). Sooo, you can just start picking random values for x and plugging it in to the equation to get a y value. For example, if you were to plug in 3 for x, you would get: y = 20 + x/3 y = 20 + 3/3 y = 20 + ...
*December 10, 2009*

**9th grade**

Convert milligrams to grams to make it easier: 1 milligram = 0.001 gram Convert kilograms to grams as well so you have the same units: 1 kilogram = 1000 grams Divide kilograms (1000 grams) by milligrams (0.001 grams) to get your answer.
*December 10, 2009*

**algebra**

In this case I would use the method of synthetic substitution, but since I never learned this technique 'til this year in Precalculus, let's stick with long division: 1) Write out the problem like an elementary division problem, with the bar over the 4m^2-9m^2...+7 and...
*December 10, 2009*

**Physics**

1-A car is lifted a certain distance in a service station and therefore has potential energy with respect to the floor. If it were lifted twice as high, how much potential energy would it have? Answer: twice as much 2-Two cars, one twice as heavy as the other, are lifted to ...
*December 9, 2009*

**Social Studies?**

What were churches like in England/Britan during the 1800's?
*December 9, 2009*

**Physics**

if a car travels at 50 km/h, it has kinetic energy. How much more kinetic energy does it have at 100 km/h? Answer=100 squared as much (10000)
*December 9, 2009*

**Physics**

1-A car is lifted a certain distance in a service station and therefore has potential energy with respect to the floor. If it were lifted twice as high, how much potential energy would it have? Answer: twice as much 2-Two cars, one twice as heavy as the other, are lifted to ...
*December 9, 2009*

**Precalculus**

Ohhh I see. Thanks Reiny this helped a lot!! :)
*December 8, 2009*

**Precalculus**

Solve the equation x^3 - 2x + 4 = 0. ==> I know the answer is -2, but I can't seem to remember how to solve these by hand without using a graphing calculator. Any help is greatly appreciated!! :)
*December 8, 2009*

**english**

good, great, nice, and wonderful.
*December 8, 2009*

**Math**

This is the question given: "Peanuts sell for $5/kg and cashews for $20/kg. Mary wants to sell a mixture of peanuts and cashews for $12/kg. How many kilograms of peanuts and cashews would Mary have to mix in order to make 30kg of the $12/kg mixture?" This is an ...
*December 8, 2009*

**Precalculus**

Ohh never mind, I found my error. I feel kinda stupid now though lol
*December 7, 2009*

**Precalculus**

Find the vertex, focus, and axis of symmetry of the parabola x^2-10x-8y+29 = 0. ==> I do it over and over and over, but I keep getting the same answers of (5,4) for the vertex, (5,6) for the focus, and x = 5 for the LOS, but according to this one website, everything except ...
*December 7, 2009*