Thursday

April 17, 2014

April 17, 2014

Total # Posts: 1,498

**chemistry**

A 2.500 gram sample of hydrate of calcium sulfate loses 0.532 grams of water when heated. Determine the mass percent of water in the hydrate and the formula of the hydrate.

**Physics**

An electron enters a parallel plate apparatus 10.0cm long and 2.0cm wide, moving horizontally at 8.0 × 10^7 m/s. (top plate is positive, electron is 1.0cm from each plate..) The potential difference between the plates is 6.0 × 10^2 V. Calculate... (a) the vertical ...

**math**

482 multiplied by 8,624,798,324.287

**physics**

How much kinetic energy is gained by an electron that is allowed to move freely through a potential difference of 2.5 × 104 V?

**Physics**

A 1.0 × 10−6 C test charge is 40.0cm from a 3.2 × 10−3 C charged sphere. How much work was required to move it there from a point 1.0 × 102 cm away from the sphere? what formula(s) should be used to calculate work...?

**PHYSICS**

Humid air breaks down electrically when its molecules become ionized. this happend in an electric field |E|=3*10^6 N/C. In that field, calculate the magnitude of the electric force on an ion with a single positive charge. ..when they say a single positive charge do they mean +...

**math**

bill is 6

**Chem**

Give the ideal bond angle for BrO3- ion? I know this has trigonal bipyramidal geometry and therefore the bond angle is < 109.5. Is there a way to determine a more specific bond angle?

**Chem**

How many sigma bonds are there in trypophan? I know the answer is 28 but I don't know how to get that answer. Can someone please explain?? Thanks!

**Chemistry**

What is the product of Bromo Blue, CaCl2 (calcuim cloride) and NaHCO3 (baking soda)?

**Pre Cal**

1 --------- 2x^2-2 --------------- 2 + x ---- ------- x+11 x^2-2x-3

**chemistry**

How much energy (in kilojoules) is released when 12.3g of steam at 121.5degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67 kj/mol, and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol) for th...

**chemistry**

What is the vapor pressure of CS2(in mmHg) at 18.5degree C? Carbon disulfide, CS2, has Pvap= 100mm at -5.1 degree C and change in Hvap = 28.0 kj/mol .

**chemistry**

At what temperature (in degrees C) does acetone have Pvap= 102 mmHg?

**9th grade Math**

I need help in creating 3 Math problems that has to do with Baseball. Does anyone know how to or websites to help me...

**Math**

It wasn't me. I don't understand how to do the entire thing.

**Math**

How would you explain how to do this problem step by step in words? The answer is suppose to be 43/128 11/16-(-3/4)^2/2^3/5

**Math**

A marching band has 88 students. If the band limits the group to marching in 11 rows, how many students will march in each row?

**math**

on a centemeter ruler where is .13 m?

**chemistry**

How much energy (in kilojoules) is released when 12.3g of steam at 121.5 degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67kj/mol , and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol)for th...

**physics**

lots of questions 1) a 2N and 6N force pull on an object to the right and a 4N force pulls to the left a 0.5 kg object what is the net force on the object 2)a 20mkg bike accelerates at 10m/s2 with what force was the person pedaling 3)if a person is pushing a cart with a force ...

**physics**

if a person pulls on a cart to the right with a force of 10N and a second person pulls to the left with a force of 3N what is the net force (+ direction)on the cart

**physics**

a sled is being pulled to the left by 5 dogs, each dog pulling with 6 newtons of force what is the net force

**science**

When a truck pulls a trailer, the trailer and the truck acclerate forward even though the action and reaction forces are the same size but are in opposite direction. Why don't these force balance each other

**algebra 9**

the sum of radical 5 and radical 45 is?

**Math**

2364

**chemistry**

A 2 x 10^-3 M solution of MnSO4 is gradually made more basic by adding NaOH. At what pH will manganese(II) hydroxide begin to precipitate? [Ksp of Mn(OH)2=2 x 10^-13]

**math**

How many liters are contained in a cube with each edge 1m? HOW do you do this? How do I know how many liters fits into a meter?

**math**

A cylindrical can of cleaner holds 1 L of liquid. What is its height if the diameter of the base is 10 cm? How do I do this? I need to show my work AND I need to understand how to do it.

**math**

The two cereal boxes shown have corresponding edges in a ratio of 2:3.If the smaller box sells for $2.50 and the larger box for $4.00, which is the better buy? Why? What assumption(s) do you have to make when solving the problem? Estimate, then check. I think the answer is the...

**math**

A cylindrical can of cleaner holds 1 L of liquid. What is its height if the diameter of the base is 10 cm? How do I do this? I need to show my work AND I need to understand how to do it.

**math**

So does 166.28 sound about right? I don't have any examples to base the answer against, so I am very leery of this.

**math**

How do I find out on a standard calculator what this is: A=1/2 (4 3 )(48) It's supposed to read 4 square root 3 I don't even know how to input this into my calculator. Can someone tell me how? thanks!

**Physics**

A girl kicks her soccer ball with a velocity of 2m/s at an angle of 40 degrees with the horizontal. what is the total time? what is the ranger? and what is the max height of the ball?

**geometry/math**

How do I find the area and perimeter of a square when all I'm given is a diaganol line cutting the square into two equal halves, with the length of the line being 6square root2, and the angles of the square are all 90 degrees, with the angle bisected by the line being 45 d...

**spanish**

are these sentances correct? Las jirafas con los cuellos cortos vio la jirafa con el cuello largo. Las jirafas con los cuellos cortos pensaban que un largo cuello es muy guapo. Quisieron tener largos cuellos también. Las jirafas fueron a Frank. Esperan que él pue...

**english**

What are the differences and similarities between Modernism to Postmodernism. I get confused between these two.

**math/geometry**

a. Describe the different types of planes of symmetry and axes of symmetry of a regular octahedron. b. How many planes and axes of symmetry does a regular octahedron have? c. Make a sketch and compare the symmetry properties of a regular octahedron and a cube.

**geometry**

Why is it impossible for a regular polygon with more than six sides to tesselate the plane? I know it has something to do with the angles, but I'm not sure what to write for this. 3 hexagons tesselate the plane and they have angles at 120, but why can't an octagon? Why...

**algbera**

which ordered pair is a solution of the equation ? 3x+y=0 A.(-1,3) B.(3,-2)c.(-2,3) D.(3,-1)

**Economics**

This is what I've come up w/ so far... I just need to expand a bit.... Artificial supply creates artificial demand. Coupons don't work because the supply is not market driven. What they create is a black market. The value of coupons is inevitably to be determined by th...

**Economics**

How does a price ceiling undermine the rationing function of market-determined prices? How could rationing coupons insure that consumers with the highest values get the limited amount of a good supplied when government price ceilings create shortages? Fully explain your answer...

**science**

Chemical reaction

**U.S History**

Each quote is either from the Constitution (what part of it?) or the Bill of Rights (which amendment?) 1."He has endeavored to prevent the population of these states: for that purpose obstructing the Laws for Naturalization of Foreigners" 2."For cutting off our ...

**statistic help pls**

a car insurance company has determined that 6% of all drivers were involved in a car accident last year,among the 12 drivers living on one particular street,3 were involved a car accident last year.if 12 drivers are randomly selected what is the probability of getting 3 or mor...

**statistics**

the participants in a television quiz show are picked from a large pool of applicants with approximately equal number of men and women.Among the last 11 participant there have been only 2 women.If participants are picked randomly,what is the probability of getting 2 or fewer w...

**statistics**

an airline estimates that 97%of people booked on their flights actually show up.if the airline books 70 people on a flight for which the maximum number is 68,what is the probability that the number of people who show up will exceed the capacity of theplane

**to reiny**

so would my equation be: d^2 + 3^2=6^2 d^2 + 9=36 d^2=27 d=square root of 27? d=5.197 or 5.2?

**math/geometry**

complete the statements: To find the length of the hypotenuse of a 45-45-90 triangle, multiply the length of one of the legs by:? Could the answer be .5??? to find the length of the shorter leg of a 30-60-90 triangle, multiply the length of the longer leg by:? To find the leng...

**geometry again**

I have a pic of a right square pyramid with equilateral triangular faces with each side of the triangle measuring 6 in. i have a line "d" intersecting one of the triangles making 2 right angle triangles. Using the pythagoream theory- how do I find the distance d? I k...

**geometry**

The skipper of a boat knows that the water is too shallow to bring his boat inside a "danger semicircle" that goes from lighthouse to lighthouse. How can the angle between his sightings of the two lighthouses help him decide when he is entering the danger zone? How c...

**re: geometry**

The boat is outside of the semicircle. So how can his angle help him decide when he is entering the dangerous semicircle? is there a certain theory that this pertains to? I still don't understand. Please, help again? thanks

**geometry**

The skipper of a boat knows that the water is too shallow to bring his boat inside a "danger semicircle" that goes from lighthouse to lighthouse. How can the angle between his sightings of the two lighthouses help him decide when he is entering the danger zone? How c...

**home economics**

Teacher @ High School level Teacher at Vocational School Cook homemaker Cooking TV Show Host Martha Stewart/ Rachel Ray Book (Author like Emerald L) Host at a restaurant Personal Chef Seamstress Macy's sales person in home department Manager of Homegoods

**physics**

if a block of wood dropped from a building has attained a velocity of 78 m/s how long has it been falling?

**math**

how do you find domain and range for the problem f(x)=x cubed

**college math**

sam bought 1 of 250 tickets for $2 in a raffle with the prize of $400. Was $2 fair price? Can someone show me the formula on how to get this answer. My text is super confusing.

**5th grade**

21n

**Math**

If you have 200 blocks and want to stack them in a solid shape, how many shapes can you stack them?

**Physics**

Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characeristic radiation characteristics?

**physics**

How does the mass of a nucleon compare with the mass of an electron?

**college math**

a bag contains 7 red chips and 9 blue chips. Two chips are selected randomly from the bag without replacement. What is the probability that the two chips are the same color? If someone could just point me in the right direction for the many equations I could use I would be gra...

**math**

Babe Ruth's lifetime betting averge was .343. In three times at bat, what is the prbability of the following? a. he gets three hits b. he gets no hits c. he gets at least one hit. d. he gets exactly one hit

**college math**

a pair of dice are rolled and the sum is recorded. What is the probability that the sum shown is 8 given that one die is showing 5? Is this done correctly? P(8|5)=1/6 x 1/6= 1/36 I really just want to make sure I have done this the right way!

**college math**

Can someone just tell me the formula to use for this problem? Jack is taking a four item true/false test. He decides to flip a coin to answer. What is the probablility he gets a perfect score? What is the probablility on a 10 question test?

**math**

So I just multiply the probability of each ball on each turn? Thank you sooo much! Why can't the text just say that?

**math**

I have a question in my math class in college. Here is the question, but I just need help on HOW to answer it. My text isn't clear at all. A box contains 2 black balls and 3 gold balls. 2 balls are randomly drawn in succession. a.if there is no replacement, what is the pro...

**Physics**

Describe the Bohr model of the atom. What is de Broglie's key idea (involving matter waves) that makes the Bohr atom have discrete energy levels?

**Physics**

The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n^2, where n=1 labels the lowest or "ground" state, n=3 is the thrid state, and so on. If the atom's diameter is 1 x 10^(-10...

**math**

Henry's z-score on his reading test was 1.27. The class average was 60, the median was 58.5 and the variance was 6.2. What was Henry's "raw" score (his score before converting to z-scores)

**Algebra 2**

what is the answer to: -6psquared+11p+7=0 i'm confused...

**Physics**

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

**Physics**

An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: Power suppled to the secondary?

**Physics**

20=240/N Is the answer 480=N

**Physics**

A model electric train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the primary is connected to a 120 V household circuit?

**physics**

How can you easily increase the magnetic field strength inside a current-carrying coil?

**art**

during what years did boticelli visit rome

**writing ASAP-.**

i'm work on a book project on ameila earhart.The queston on my book report is ...How is the provied by the author imporant or relatable to today's modern society ?Please tell what this means and give an example.

**Physics**

How do you divide 4.0 V by .041 A? Would the answer be: 97.6

**Physics**

Is the answer 30?

**Physics**

The voltage across a 10-ohm resistor carrying 3 amps must be?

**National and State Government**

How did the Civil Rights Division of the Department of Justice operate during the George W. Bush administration?

**History**

Which political faction would Obama have fallen under: Federalist or Jeffersonian?

**Physics**

Is the answer F subscript elec F subscript grav = (8.22 x 10 subscript -8) (3.63 x 10 subscript -47) = 2.26 x 10 subscript 39

**Physics**

How do you calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10 to the negative 10 m. Is the answer: m x a = (4p2r/t2)= 10 - 30 x 4 x1021= 4x10

**9th grade(math)**

the product is two times m

**Trig**

Oh, so basically.. I would subtract 2pi, which gives me 11pi/6. The cos of 11pi/6 is sqrt(3)/2. Since the sec is 1/cos(23pi/6), it would also be 1/(sqrt(3)/2)? Simplified, that gives me a final answer of 2sqrt(2)/3, which is the answer I was looking for. Thank you for your res...

**Trig**

Oh, so basically.. I would subtract 2pi, which gives me 11pi/6. The cos of 11pi/6 is sqrt(3)/2. Since the sec is 1/cos(23pi/6), it would also be 1/(sqrt(3)/2)? Simplified, that gives me a final answer of 2sqrt(2)/3, which is the answer I was looking for. Thank you for your res...

**Trig**

Find the exact circular function value for: sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to solve the problem. I have a unit circle, but 23pi/6 is not on it, so I don't know how to find the (x,y)

**home economics**

HBV protein is a type of protein that comes from animals like the protein in liver or beef and it contains all the essential amino acids and in the correct proportions. LBV is protein from vegetable products like lettuce.

**Math**

greater than 30 but less 40 and if you add the digits you get a sum of 10. What is the number word? greater than 7/10 tens but less than 8/10 tens the number has 4 ones, what is the number word? I have more but will wait for these first, thanks. This is to try and help my litt...

**algebra**

what is 1.59x+4.23=3.56x+2.12

**algebra**

what is 1.59x+4.23=3.56x+2.12

**chemistry**

I still do not understand how to figure out this problem yet? 6FeO3----->4Fe304+02 DELTA H=+ 392kj If 2.83 g of Fe2O3 decomposed according to the above reaction , how many kj of heat would be exchanged with the enviroment? chem - DrBob222, Thursday, October 15, 2009 at 11:1...

**chem**

6FeO3----->4Fe304+02 DELTA H=+ 392kj If 2.83 g of Fe2O3 decomposed according to the above reaction , how many kj of heat would be exchanged with the enviroment?

**4th grade**

if a=11 b=2 c=18 then what does a+c-b=?

**Calculus**

wow im sorry, this was a lot easier than i thought

**Calculus**

y = ln(3x+5), then d^2y/dx^2 = a. 3/(3x+5) b. 3/((3x+5)^2) c. 9/((3x+5)^2) d. -9/((3x+5)^2) e. -3/((3x+5)^2)

**Calculus**

f(x) = sq.root(e^2x+1), then f'(0)= a. -sq.root(2)/2 b. sq.root(2)/4 c. sq.root(2)/2 d. 1 e. sq.root(2)

**Math**

Pages are 30 and 31 30x31=930

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