Friday

January 30, 2015

January 30, 2015

Total # Posts: 1,509

**science**

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. Given this information, how many electrons does it have? How many protons and neutrons does this atom have?
*March 9, 2014*

**science**

A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?
*March 9, 2014*

**Probability**

Anyone know answer to 2?
*March 7, 2014*

**Geometry **

In baseball, the length of the path between each pair of consecutive bases is 90 feet. The paths form right angles. How far does the ball need to travel if it is thrown from home plate directly to second base? A. 90 feet B. 127.3 feet C. 135.7 feet D. 180 feet
*March 6, 2014*

**MATH**

I agree with tbetzz
*March 5, 2014*

**MATH**

But why would you subtract the 576 and 144. and plus to find the circumference you were supposed to times the 576 by pi and the 144 by pi
*March 5, 2014*

**Physics**

its 54.7 km/s
*March 4, 2014*

**Geometry **

A trapezoid has a perimeter of 14 feet. What will the perimeter be if each side length is increased by a factor 7? A. 21 feet B. 98 feet C. 196 feet D. 686 feet This one is def B correct?
*March 2, 2014*

**Geometry **

A rectangle has an area of 6 square meters. What will be the area of the rectangle if each side length is increased by a factor 5? A. 11 square meters B. 30 square meters C. 125 square meters D. 150 square meters I think the answer is B
*March 2, 2014*

**Geometry**

Is it D?
*March 2, 2014*

**Geometry **

A rectangular prism has a base that is 5 cm by 7 cm and a height of 12 cm. If all dimensions are doubled, what happens to the volume? A. When the dimensions are doubled, the volume is twice the original volume. B. When the dimensions are doubled, the volume is three times the ...
*March 2, 2014*

**Geometry **

A triangle is enlarged by a factor of 3. The perimeter of the new triangle is 36 feet. What could be the lengths of the sides of the original triangle? A. 3 feet, 4 feet, and 5 feet B. 1.5 feet, 1.25 foot, and 1.25 foot C. 2 feet, 0.5 feet, and 1.8 feet D. 4 feet, 4 feet, and ...
*March 2, 2014*

**Geometry **

The circumference of a circle changes from 20 to 4 after a dilation. What was the scale factor of the dilation? A. 1/25 B. 1/5 C. 5 D. 25
*March 2, 2014*

**Geometry **

A circle with a radius of 1/2 ft is dilated by a scale factor of 8. Which statements about the new circle are true? Check all that apply. A.The length of the new radius will be 4 feet. B.The length of the new radius will be 32 feet. C.The new circumference will be 8 times the ...
*March 2, 2014*

**Geometry **

What is the height of a cylinder with a volume of 384π cubic inches and a radius of 8 inches? Round to the nearest tenth of an inch.
*February 28, 2014*

**Geometry **

A cylindrical water tank has a diameter of 20 feet and a height of 15 feet. How much water is needed to fill the tank?
*February 28, 2014*

**math- calculus**

You will often see proj (Vector a onto Vector b) written as projb⃗ a⃗ .Show that projb⃗ a⃗ =(a⃗ ⋅b⃗/ b⃗ ⋅b⃗ )*b⃗ .
*February 26, 2014*

**physics**

(a) A car with a mass of 950 kg is moving to the right with a constant speed of 1.45 m/s. What is the total force on the car? (b) What is the total force on the car if it is moving to the left?
*February 21, 2014*

**math**

A stairway runs up the edge of the pyramid. From bottom to top the stairway is 92 m long. The stairway makes an angle of 70° to the base edge, as shown. A line from the middle of one of the base edges to the top of the pyramid makes an angle of elevation of 52° with ...
*February 20, 2014*

**Black Death**

I have to do a powerpoint on the Black Death. Where can I find the best information to write about it?
*February 19, 2014*

**Geometry**

Is it B?
*February 17, 2014*

**Geometry**

How does the volume of a rectangular prism change if the width is reduced to 1/10 of its original size, the height is reduced to 1/4 of its original size, and the length is reduced to 2/3 of its original size? A. V=1/120lwh B. V=1/60lwh C. V= 2/3lwh D. V=3/4lwh
*February 17, 2014*

**MATH**

David wants to reduce a rectangular image on his computer so that the new image has 25% of the area of the original image. How should David modify the image? Justify your answer.
*February 17, 2014*

**MATH**

Drew has a rectangular postcard that is 6 inches long and 4 inches wide. He uses a photocopier to enlarge it, so that the length and width are 1.5 times as long as those of the original postcard. Explain how the perimeter and area change.
*February 17, 2014*

**Geometry**

Thank you so much oh my god
*February 17, 2014*

**Geometry **

How does the volume of a square pyramid change if the base area is quadrupled and the height is reduced to 1/9 of its original size? A. V= 1/27Bh B. V= 4/27Bh C. V= 2/9Bh D. V= 4/9Bh
*February 17, 2014*

**Geometry**

but that's not a choice. A. 1/6 B. 1/3 C. 3 D. 6
*February 17, 2014*

**Geometry **

The volume of a square pyramid is equal to _____ times the volume of a cube where the bases are the same, but the square pyramid is half the height of the cube.
*February 17, 2014*

**Geometry **

If a cylinder’s radius and height are each shrunk down to a third of the original size, what would be the formula to find the modified surface area?
*February 17, 2014*

**Calc**

Find the coordinates of the point on the curve xy=6 in quadrant I where the normal to the curve passes through the origin.
*February 16, 2014*

**calc**

The slope of the tangent to the curve y=f(x) is given by (1/9)(x^2)(y^2). The curve passes through the point (3,1). Find the value of y when x=3*cubedroot(3).
*February 16, 2014*

**Calc**

it wasn't a typo.. how did you get 10?
*February 15, 2014*

**Calc**

Let f be the function that contains the point (-1,8) and satisfies the differential equation dy/dx=10/(x^2+1) (a) Write the equation of the tangent to f at x=-1. (b) Use your equation in part a to estimate f(0). (c) We know that the integral from -1 to 0 of 10/(x^2+1) equals ...
*February 15, 2014*

**Geometry **

Andrea has a yard shaped like parallelogram ABCD. The garden area, parallelogram EFGB, has an area of 105 ft. If Andrea wants to sod the rest of her yard, how many square feet of sod should she order? A. 765 ft B. 840 ft C. 945 ft D. 1,515 ft
*February 9, 2014*

**Math :-)**

Explain why knowing the height is needed when finding the perimeter of a right triangle.
*February 9, 2014*

**Geometry **

Maria is making a stained glass window in the form of a kite. The width of the window must be 15 in., and she only has enough stained glass to cover 60 in. What should the height of the window be? A. 4 in. B. 6 in. C. 8 in. D. 12 in.
*February 9, 2014*

**Classical mechanics**

Hi juanpro is there other classical mechanic. I might want to join too.
*February 7, 2014*

**Plz, plz help! SS**

Whats that Nicole M??
*February 5, 2014*

**english/writing**

does my thesis statement make sense? is it clear? any suggestions are welcomed In "The Love Song of J Alfred Prufrock," T.S. Eliot used Prufrock to symbolize modern man's fruitless struggle to find self-worth, love, and insecurities of owns appearance. thank you! :D
*February 4, 2014*

**biology**

"ide","ite","ate"
*February 4, 2014*

**Business/ Computers**

Hello I'm doing a powerpoint on the history of computers for business but I just have to look for people. Do you mind giving me a website that would be perfect to find all these people? 1. Blaise Pascal 2. Wilhelm Schickard 3. Christopher Sholes 4. George Stibitz 5. ...
*February 3, 2014*

**Science (Chemistry)**

After submitting the answer, this is what I received as feedback. The system is marking that the amount of moles of precipitate was incorrect, although when I did the problem originally I got the same number that you did. I am just posting this feedback for future reference, ...
*February 2, 2014*

**Science (Chemistry)**

A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
*February 2, 2014*

**Science (Chemistry)**

A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
*February 2, 2014*

**science**

Write a balanced equation to describe the following reactions: a) C14H30 is cracked to produce ethene, hydrogen and one other compound b) C16H34 is cracked to produce ethene and propene in a 2:1 ratio and only one other compound
*February 1, 2014*

**math**

72 scored higher than 85% 8 scored lower
*January 30, 2014*

**science(check answers)**

Its C lol
*January 29, 2014*

**URGENT Physics PLEASE help**

5. A 1,600 kg car is moving south at 24 m/s. What is its momentum? (Points : 1) 66 kgm/s south 66 kgm/s north 38,000 kgm/s north 38,000 kgm/s south Question 6. 6. The velocity of a 150 kg cart changes from 6.0 m/s to 14.0 m/s. What is the magnitude of the impulse that acted on...
*January 27, 2014*

**Science**

Planet D. Gravity and Inertia. The Moon would move in a straight line.
*January 24, 2014*

**permutation and combination**

The game of euchre uses only the 9s, 10s, jacks, queens, kings, and aces from a standard deck of cards How many five-card hands have at least two red cards?
*January 23, 2014*

**math**

8 Quarters + 3 Dimes + 7 Nickels = 21 coins he uses 16 coins 21 - 16 = 5 he used 8 Quarters, 3 Dimes and 5 Nickels therefore he has 2 Nickels left
*January 23, 2014*

**permutations with identical items. **

how many four letter arrangements are there for the word Mattawa?
*January 23, 2014*

**math**

* :)
*January 22, 2014*

**math**

your welcome ")
*January 22, 2014*

**math**

12/12 - (3/12 + 2/12) 12/12 - 5/12 = 7/12 therefore there are 7 green marbles
*January 22, 2014*

**Data Management**

what is the probability that either a heart or a face card (K Q J) is chosen but the Q of heart is missing from the deck?
*January 22, 2014*

**Data Management**

a couple is planning to have seven children. what is the probability that at least 3 of the children will have a birthday in the same month
*January 22, 2014*

**Data Management**

if mike does homework today the probability that he will do it tomorrow is 0.8. the probability he will do it today is 0.7. what are the odds that he will do it both today and tomorrow
*January 22, 2014*

**Data Management**

there is a six sided die, number 1- to 6. what is the probability that it it take exactly two tries to roll a 4? what is the expected waiting time until and odd prime number is rolled?
*January 22, 2014*

**Science**

Fuyuko is correct. D B B B
*January 21, 2014*

**Spanish**

Can somebody help with my Spanish review? Combina lógicamente las palabras de vocabulario de las dos columnas. a. la caza b. el boxeo c. penalizar d. el/la jinete e. la cancha f. transnochar g. el campamento h. los naipes 1. el arco y la flecha (A) 2. la tienda de campa...
*January 17, 2014*

**URGENT! PLEASE HELP QUICK PHYSICS**

Summarize two observations that are contrary to the predictions based on Newton’s laws but that confirm Einstein’s explanation of gravity. Indicate how the predictions based on Newton’s theory differ from Einstein’s.
*January 15, 2014*

**Damon**

I've spent 4 hours to solve it as the result question a is done, but i'm a russian teenager, that is going to attend the uneversity, and unfotunately, i don't know how to solve it with non-constant friction koff.
*January 12, 2014*

**World History**

What were the crusades? What motivated most Europeans to join the crusades?
*January 12, 2014*

**Proofreading**

Well SMS was my middle school and now we're in high school and we don;t even go to the same one
*January 10, 2014*

**Proofreading **

tomorrow is my friend's birthday and she's turning 15 so I'm writing her a birthday card and I was wondering if I did any mistakes (I'm going to now write it on the card). Happy Birthday Sarah, You were definitely one of the few people in SMS who managed to ...
*January 10, 2014*

**physics**

A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Why are marks left on the wooden floor by the woman's shoe heels but not her shoe soles?
*January 5, 2014*

**physics**

240n/2cm^2
*January 5, 2014*

**physics**

240n/40 cm^2
*January 5, 2014*

**physics**

A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Sometimes all this weight acts on the heels of her shoes. What is the pressure under her heels?
*January 5, 2014*

**physics**

A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Sometimes all this weight acts on the soles of her shoes. What is the pressure under her soles? area under sole 40cm squared are under heel 2cm squared
*January 5, 2014*

**physics**

A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Sometimes all this weight acts on the soles of her shoes. What is the pressure under her soles?
*January 5, 2014*

**physics**

A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Sometimes all this weight acts on the soles of her shoes. What is the pressure under her soles?
*January 5, 2014*

**Math :-)**

It was C nevermind lol thank you anyways
*January 5, 2014*

**Math :-)**

The answer is A. Right?
*January 5, 2014*

**Math :-)**

Analyze the conditional statement below and complete the instructions that follow. You will receive the trophy if you win the championship match. Identify the hypothesis and the conclusion of the conditional statement. A. hypothesis: you will receive the trophy; conclusion: ...
*January 5, 2014*

**Math**

Which of the following statements is not always true? A. In a rhombus, the diagonals bisect opposite angles. B. In a rhombus, the diagonals are perpendicular. C. In a rhombus, the diagonals are congruent. D. In a rhombus, all four sides are congruent. I think the answer is A. :-)
*January 4, 2014*

**Math **

Which parallelograms have perpendicular diagonals? A. rectangle, rhombus B. square, rhombus C. square, rectangle D. none I know the answer isn't C.
*January 4, 2014*

**Physics 2**

Stop trying to cheat S104 OU TMA04
*January 2, 2014*

**magnets**

A particle of charge +q and mass m is initially launched at speed v in a region with a constant, uniform magnetic field of magnitude B. If the particle launched in a direction perpendicular to the magnetic field, by the time the particle has traveled a distance d, the work ...
*December 18, 2013*

**AP CALC**

find an equation of the tangent line to the graph of x^4-2y^2=1 at the point (2,4)
*December 17, 2013*

**AP CALC**

Suppose that g(x)=h(x)/f(x) and f(3)=5, h(3)=6, g'(3)=4 and f'(3)=1. find h'(3).
*December 17, 2013*

**Math**

Alan, Gil, and Deb's point score in a video game was in a ratio of 2:3:4. Deb scored 114,400 points. A) how many points did Gil score? B) how many points did all of them score? i dont know how to do this would you please help me, thank you
*December 17, 2013*

**electricity and magnets**

A thick metal slab carries a current I. A uniform magnetic field B points perpendicular to the slab (and into the page). If point P on the slab is at a higher potential than point , what can we say about the charge carriers that produce the current in the slab?
*December 17, 2013*

**Physics**

Two thin, infinitely long, parallel wires are lying on the ground a distance d=3cm apart. They carry a currentTwo thin, infinitely long, parallel wires are lying on the ground a distance d=3cm apart. They carry a currentTwo thin, infinitely long, parallel wires are lying on ...
*December 12, 2013*

**physicS IMP PLS**

@Greco I tried it and it workrd for a and c and for Fy but Fx was wrong!why did you use alpha? please help with this question!
*December 9, 2013*

**physics I'M STUCK PZL HELP**

is the "u" the ejected fuel in m/s instead of km/s?
*December 8, 2013*

**physics I'M STUCK PZL HELP**

in the equation above what is the "ln"?
*December 8, 2013*

**PHYSICS IMP PLS**

@Hil if you had calculated correctly it seem to be right
*December 8, 2013*

**PHYSICS IMP PLS**

it's simple 10%/2 because 145=290/2 and it said "assume the burn rate is constant" so V=Vex*ln(1/(1-%/2)) for your case V=2000*ln(1/(1-0.05)) a=V/145
*December 8, 2013*

**Writing Skills**

Thank you so much ^_^
*December 4, 2013*

**Writing Skills**

i think 1 is 2 2 is 2 3 is 2 are they correct?
*December 4, 2013*

**Writing Skills**

1) Frequently their renovation need to be completely redone. 1 need 2 needed 3 were needing 4 will have been needing 5 needs 2)If we were teenagers at the time these licenses signified our passage to adulthood. 1 time these licenses 2 time, these licenses 3 time; these ...
*December 4, 2013*

**Science**

How far does a wave travel in three cycles?
*December 3, 2013*

**Science**

The distance from the crest of a wave to the next crest is 10 centimeters. The distance from a crest of this wave to a trough is 4 centimeters. a. What is the amplitude of this wave? b. What is the wavelength of this wave?
*December 3, 2013*

**World History**

How do the beliefs of being a Christian and being a Crusader contradict each other? How are the ideas of the Crusades used today for both Christians and Muslims?
*December 1, 2013*

**Solar**

Someone please help me. I keep getting the same wrong answer (38.4). Please help ASAP. Thanks.
*November 29, 2013*

**Solar**

All, anything on this yet? please help!!! Thanks in advance again./Anon1...didn't know there was an Anon already
*November 29, 2013*

**Solar**

Greeting All, please assist with the below. Thanks. The spectral power density of a solar simulator is given by: P(λ)=7.5∗1015λ−2.25∗109 [Wm^-2m^-1] for 300nm<λ<500nm P(λ)=2.25∗109−1.5∗1015λ [Wm^-2m^-1] for ...
*November 29, 2013*

**History**

Who were the Seljuk Turks? What did they do?
*November 25, 2013*

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