# Posts by anonymous

Total # Posts: 109,624

**Physics**

Think about it or google oil slick reflection wavelengths and look at the geometry in the images. You will see that the shorter the wavelength the thinner the film.

**Physics**

Which is the shorter wavelength ?

**Physics**

If you google pinhole camera you will find diagrams in the images.

**Physics**

Draw a diagram, similar triangles, ratio is 1/2

**chemistry**

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The nutrition facts for a 200-...

**chemistry**

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The nutrition facts for a 200-...

**Pre-Algebra**

well, Google distributive property 4a(a^2) = 4 a^3 4a(7a) = 28 a^2 4a(4) = 16 a Now add :) ======================= distributive property again 2y(3y-2) = 6 y^2 - 4 y -3(3y-2) = -9y + 6 now add 6 y^2 - 13 y + 6 works every time

**chemistry**

What volume of H2 is produced if excess nitric acid (HNO3) reacts with 46.3 g of magnesium 2HNO3 + Mg ? H2 + Mg(NO3)2

**Trade**

I agree with you. It is very expensive to grow coffee beans in Iceland and at least as difficult to fish for cod in Brazil.

**Maths**

f = 5 d f+10 = 2(d+10) so 5 d + 10 = 2 d + 20

**economics**

A description of the market form in which milk producers operate?

**math-precalculus**

help me please.. and please provide steps so I can follow. sec(2?)=3... solve for all solutions on [0,2?]

**Social studies (Mr.Sue CHECK MY ANSWERS PLZ)**

Only question wrong was #6, which was B. Bank A. Compound Interest

**Social studies (Mr.Sue CHECK MY ANSWERS PLZ)**

I agree with your replies assuming that payroll taxes in #14 means FICA (social security and medicare) which are federal. All the others are also state taxes here in Massachusetts for example.

**history**

the answers to the quick check are 1~ C 2~ A 3~ D 4~ B 5~ B

**history**

the second one is B, and the last one is also B

**Health, Fitness, and Nutrition**

Carbohydrates are the body's main body supply of energy But I dont know the other one :(

**Calculus Please Check my answer**

Steve has shown you how. I then tried to simplify the integration process The problem is that even if you use Wolfram for the integration of ln (x+2)dx/x you get a messy function. I bet your teacher did not expect you to run into that and therefore suspect an error in the ...

**Calculus Please Check my answer**

I bet you have a typo somewhere but the basic idea is that you are given the RATE of filling = F-E To find the AMOUNT, you must integrate the rate over time. Then of course you have a constant of integration which is determined by the amount in the bucket at t = 0

**Calculus Please Check my answer**

I also hit the wall but took the following steps which might help: let z = t+2 then t = z-2 and dz = dt let Q = amount in there and it is 0 at t = 0 then dQ/dt = dQ/dt = (z+5)/z -ln(z+2) /z so integrate z dz/z + 5 dz/z - ln(z+2)dz/z = z + 5 ln z - a mess even with Steve's ...

**algebra**

Y=4.50g+3 Because every time she plays a game it will cost her 4.50 but she doesn't have to rent shoes every time, just once. So for example if she choose two play 4 games then the cost would be 4.50(4)+3

**Physics **

A plutonium- 239 nucleus initially at rest undergoes alpha decay to produce a uranium-235 nucleus. The uranium-235 nucleus has a mass of 3.90 x 10^-25 kg and moves away with a speed of 2.62 x 10^5 m/s. Determine the minimum wage electric potential difference that is required ...

**Biology-Genes**

red fish-recessive green fish-dominant -Can two red fish mate and have green offspring? Vice Versa?

**mechanics**

Find the greatest and least resultant of two forces whose magnitude are 12 N and 8 N respectively

**maths**

Draw a line segment xy of length 12.8cm.find a point z on xy,which divides it in the ratio 4:5.write the steps of construction

**physics**

Calculate the tension in a vertical strand of spider web if a spider of mass 8.00Ãƒâ€”10Ã¢Ë†â€™5 kg hangs motionless on it. (b) Calculate the tension in a horizontal strand of spider web if the same spider sits ...

**Math**

45% of 40 is 18% of what number?

**Physics**

In what part of the electromagnetic spectrum does the wavelength 0.0141 nanometers belong in?

**Physics**

r = 0.40 meters angular velocity = omega = w linear velocity = v v = w r = 20 m/s so 20 = w * 0.40 w = 200/4 = 50 radians/second so for part b 50 radians/s * 5 s * 1rev/2pi rad =125/pi revs

**economics**

What is South African government providing and for who in terms of welfare payments and consumer subsidies?

**Physics**

1800 rev/min * 2 pi rad/rev * 1 min/60 s = Omegai 1200 similarly ---> Omegaf d omega = (Omegaf-omegai) dt = 25 s so d Omega/dt = alpha = d omega/dt average angular velocity = (Omagaf+Omegai)/2 total radians = average vel * 25 sec total revs = total radians/2pi

**Physics**

(2 k Q^2/a^2) cos 30

**Math**

81

**Geometry**

Two circles touch each other. One of the circles has a diameter of 26 cm and the other circle has a diameter of 12 cm. Write down (a) the least distance between the centres of the two circles, (b) the greatest distance between the centres of the two circles

**Chemistry **

The density of aluminum is 2.70 g/ml. What is the mass of a cube of Al that measures 2.20 cm on each side?(remember significant figures and to include the units of g in your answer, remember that 1 ml=1 cm3) Need help can someone go step by step so I can understand how to do it

**history**

ok will do!! thank you for your help :)

**history**

sorry I meant speak instead of speech

**history**

Opps sorry, could you help me fit this into what I already have please? ...People are allowed to speech freely and openly about whatever they think is important, and are allowed to tell the government what the people want

**history**

Ok here is mine. The congress is not allowed to make a law that includes a religion, people are free to worship whoever they believe in, worship where ever they think is the most appropriate place, and to fight for their beliefs.

**history**

Can anyone please paraphrase the first amendment

**Georgia State History**

Which of the following is a use of credit? A)buying groceries with cash B)purchasing home by taking out a mortgage C)purchasing something in exchange for a service D)paying with a personal check***

**Math**

So it's A???

**Math**

5 x^2 so 5 is coef of x^2 2 x so 2 is coef of x the -4 is a constant, not a coefficient.

**math**

Try typing 75*0.6 into Goggle :)

**Math**

I do not see your table. However if there is just one of each color of each thing then 1/4 * 1/2 = 1/8 The hat could be any old color.

**Pre- Algebra**

(1/6)(120)

**m**

what are the first four terms represented by n(n-2)-3

**math**

if you bet 9 on the green I bet 11 on the white although the probability of green = 9/20 and the probability of white = 11/20 the ODDS of green are 9/20 / 11/20 = 9/11

**Maths **

Nick is five years older than Ben. The sum of their ages is 33. How old is Nick?

**english**

An extensive list that identifies sources cited in your research report is called a(n):

**Geometry**

tan A = .11 = rise/run A = 6 degrees 17 minutes

**physics**

falls 4 meters v = -g t h = Hi - (1/2) g t^2 g = 9.81 m/s^2 so 0 = 4 - 4.9 t^2 t^2 = 4/4.9 t = .904 seconds v = -9.81 * .904 = -8.87 meters/second

**MATH**

Y

**math **

Janine is considering buying a water filter and a reusable water bottle rather than buying bottled water. Will doing so save her money? First, determine what information you need to answer this question, then click here to display that info (along with other info). How much ...

**Math**

1000(1.3)(.75)

**Math**

slope = dT(h)/dh = -0.003

**Math**

sqrt (x) = 6 x x = 36 x^2 but may introduce false solution along with correct one 36 x^2 -x = 0 x(36 x -1) = 0 x = 0 or x = 1/36 x = 0 works, 0 = 0 if x = 1/36 1/6 = 6/36 yes that also works so x = 0 or x = 1/36

**Math 6b**

yes, 1/2 * 1/6 = 1/12

**Science**

F = m a F = 90*.5 = 45 N so I agree with you Maybe they are rounding to one significant figure because they say 0.5 and not 0.50 ?

**Math**

check it (It works :)

**Math**

well, the highest power is 2 to get x-2 out of this (1x^3-3x^2+1x+2)/(ax^2+bx+c) = [ x - 2 + (-2x+4)/(ax^2+bx+c)] so multiply [ x - 2 + (-2x+4)/(ax^2+bx+c)] by (ax^2+bx+c) = -2x+4 -2 (ax^2+bx+c) +x (ax^2+bx+c) = 4-2c -2x-2bx+cx -2ax^2+bx^2 +ax^3 which has to be x^3-3x^2+x+2 so...

**math**

1 - probability of yellow 1 - 2/16 14/16 7/8 So it turns out I agree :)

**Math**

75

**math**

maybe: y(x) = 2 x + 4

**science**

initial energy = (1/2)m v^2 + m g (10) = m(.5 v^2+98.1) final energy = m(98.1) so 98.1 = .5(.5v^2 +98.1) 2(98.1) = .5 v^2 + 98.1 .5 v^2 = 98.1 v = sqrt(2*98.1) v = about 14 m/s

**science**

50 * 2*10^3 = 10^5 Joules

**Math-age problem**

43 67

**Math**

j = 20.281718

**algebra**

If the length of each edge of the prism is cut by 13 , the surface area will be 13 of the original surface area.

**algebra**

If the dimensions of the rectangular prism are doubled, the surface area will increase 4 times.

**algebra**

If the dimensions of the rectangular prism are increased 4 times, the surface area will increase 8 times.

**Math**

E(m) is earnings as a function of number of times m E(m) = 20 m

**Physics**

1.16 m is tiny compared to the radius of 1.06*10^3 meters so I will assume g is constant for part (a) m g = G m M/r^2 g = 6.67*10^-11 (1.95*10^13)/(1.06^2*10^6) = 11.6*10^-4 m/s^2 d = (1/2)gt^2 =1.16 for part (b) the kinetic energy + potential energy at the bottom = potential ...

**American government check my answer**

That is ok, we did not need it :) Thanks anyway. The other answers apply to another president entirely.

**American government check my answer**

LOL, I do not see your excerpt but have to agree with your answer.

**American government check my answer**

agree with both

**American government check my answer**

It is not B or D. If the people in the photo are Asian in 1800s laborer garb it could be A If it is people from many places in 1920s garb it could be C depends on what is in the picture.

**Probability ,math**

permutations 4! = 4*3*2*1 = 24

**math **

You're planning on making 4 meatloafs for a party. You go to the store to buy breadcrumbs, and see they are sold by the canister. How many canisters do you need to buy? •How much breadcrumbs does the recipe call for? It calls for 1 1/4 cups of breadcrumbs. 1 canister ...

**Algebra**

4 x^3/2x^2 = 2x 10 x^2 /2 x^2 = 5 3 a/2x^2 = (3/2) a/x^2 {which is 1.5a x^-2} now add (distributive property) 2x + 5 + 1.5 a x^-2

**makes no ense**

Your passage seems not to relate to the questions.

**math **

Which of these glasses contains more liquid? Glass A contains about twice as much as glass B Glass A contains about 20% more than glass B Glass A and B contain about the same amount Glass B contains about 20% more than glass A Glass B contains about twice as much as glass A

**math**

the volume of the canister is pi r^2 h = pi * 1.75^2 * 7 = 67.35 in^3 the volume of a cup is 14.44 in^3 so the canister contains 67.35/14.44 = 4.66 cups so a cup of crumbs weighs 15/4.66 = 3.2 ounces

**math **

You're planning on making 4 meatloafs for a party. You go to the store to buy breadcrumbs, and see they are sold by the canister. How many canisters do you need to buy? •How much breadcrumbs does the recipe call for? It calls for 1 1/4 cups of breadcrumbs. • How ...

**LA plz help**

Yes, "shown in his earlier novels" gives the answer away. Yes, the word "humor" pops up repeatedly.

**GEOM B**

yes, two triangles with base 7.8 and altitude 3 hmm area of one of the six triangles = (1/2)(15)(13) = 97.5 times 6 = 585

**pre-algebra, math**

total costs c(x)= 3,000 + 10 x i(x) = 50 x p(x) = i(x) - c(x) = (50-10)x - 3,000 = 40 x - 3,000 40(100) - 3,000 = 1,000 0 = 40 x - 3,000 x = 300/4 = 75

**math**

Which of these glasses contains more liquid? Glass A contains about twice as much as glass B Glass A contains about 20% more than glass B Glass A and B contain about the same amount Glass B contains about 20% more than glass A Glass B contains about twice as much as glass A

**math **

Out of 250 racers who started the marathon, 233 completed the race, 14 gave up, and 3 were disqualified. What percentage did not complete the marathon?

**Science**

A cave explorer is surveying the cave. He follows a passage 100m straight east, then 50m in the direction 30degree west of north, then 150m at 45degree west of south. After fourth unmeasured displacement he finds himself back where he started. Whats the fourth displacement? In...

**ELA**

A

**physics**

A sandal is dropped from the top of a 15.0-m-high mast on a ship moving at 1.75 m/s due south. Calculate the velocity of the sandal when it hits the deck of the ship: (a) relative to the ship and (b) relative to a stationary observer on shore. (c) Discuss how the answers give ...

**Ela Helppp!**

Of course there is no need to believe me. Read it carefully.

**Ela Helppp!**

no

**Ela Helppp!**

I believe so.

**Ela Helppp!**

"from line fourteen; To wake at dawn with a winged heart". Joy

**2836?**

Perhaps you mean before and after Texas joined the United States.

**social studies**

Make a guess and count gods before asking us.

**english**

what are similes in the poem gathering leaves by Robert frost

**social studies**

Similar to Pan American but to the east.