Sunday

April 20, 2014

April 20, 2014

Total # Posts: 1,061

**Statistics -Please help :/**

I'm having a problem with the entire Chi-square thing.. I do have answers to these but I'm not sure how to work them out.. If you could help that would be great! :) 1st part: A,B,C are schools. Is the choice of math programs followed independently by school? Write the ...

**5th grade math**

my sister say 76764546

**Chemistry**

What will be the final temperature of the water in an insulated container as the result of passing 6.00g of steam at 100.0 degrees Celsius into 100.0g of water at 24.0 degrees Celsius?

**...**

I happen to see this looking up my question and no. this was not me.. I'm wondering if "bj" took mine and modified it to make their own.. By the way, thank you for your help! I didn't get to reply because I was asleep..

**Chemistry**

After removing a crucible (containing CaCO3 obtained as a precipitate) from an oven, what could you do (if you were being extremely careful and had enough time) to prove that the CaCO3 is dry?

**math**

What is the answer to -12+r=-11

**Espanol III**

I am writing a composition for class and need someone to peer edit. No one around knows spanish so I am hoping someone here would be willing to look over it :) Thank you! Por primera, tú necesitas cambiar los hábitos. Si tú trabajas mucho para tener una bu...

**Algebra 1**

x+x+1/3(x)=315

**Algebra 1**

answered.

**Physics **

A skier is gliding along at 2.62 m/s on horizontal, frictionless snow. He suddenly starts down a 16.9° incline. His speed at the bottom is 18.4 m/s. What is the length of the incline?

**Biology**

In each set up the dialysis tubing contains a solution of 30% glucose and safranin. However, the set ups differ in the contents of the beaker. The control set up has the same solution in the beaker while in the experimental set up it contains just water. In both the level of f...

**Math**

how do you convert 0.625 into a fraction

**Chemistry**

How do you make Tris into the acid form?

**Chemistry**

D is clearly the correct answer. In a sense, activation energy is related to temperature and at higher temps, molecules move faster and therefore have more frequent collisions. Catalysts lower the activation energy by bringing substrates together.

**algebra 2**

Farmer Brown wants to double the size of his rectangular backyard vegetable patch by adding a strip (of the same width) all the way around it. If its current patch is 12 feet by 18 feet, how wide does the strip need to be? how do you solve it step by step ?

**Mathematics**

no 11 1/8 she needs to reduce

**Trigonometry**

46

**math**

48 duh

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?

**math**

all wrong

**math**

how do i write twenty-three hundredths as a number

**math**

Your answer will be zero. When you have a negative number like that in the beginning, you can make the problem much simpler by changing it. To change the problem, circle each number with the sign directly in front of it. So in this problem, circle the "-2" and the &q...

**History**

What is predestination and how did it affect New England settlements? How did religion play a crucial role in the lives of New England women?

**Chemistry**

i think its 2. am i right ?

**Chemistry**

what is the total number of moles in 80.0 grams of C2H5Cl (gram-formula mass=64.5grams/mole)? (1)0.806 (2)1.24 (3)2.48 (4)5.16 i appreciate any help.

**Chem**

so for zinc it would be 65.3 ?

**Chem**

what is the gram atomic mass of zinc? is gram atomic mass the same as atomic mass ?

**trig**

Simplify the expression cotx divided by secx

**Math**

Many more depending on how you interpret the words of the song: 1 2 + 1 3 + 2 + 1 4 + 3 + 2+ 1 5 + 4 + 3 + 2+ 1 6 + 5 + 4 + 3 + 2+ 1 7 + 6 + 5 + 4 + 3 + 2+ 1 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 11 + 10 + 9 + 8 + 7...

**Math**

Can't figure out the answer either need the equation explaining the relationship between s & t

**Chem**

did I do this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a ...

**Math**

Luke bought some thing at the store. He paid $5.98 for a pizza, $3.75 for a case of soda $2.50 for a box of brownie mix and $1.01 in sales tax. What information is needed to find Lukes correct change?

**Math**

C. 4/32

**Math**

Which fraction also belongs in set a? set - 3/24, 5/40, 9/72, 6/48 a. 4/24 b. 2/8 c.4/32 d. 8/40

**Math**

Jairo ears $256 for 50 hours of work. Write an equation(proportion) to find x his wages for 76 hours of work

**Chemistry**

is this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a cataly...

**English 101**

What does uncanny and marvelous mean?

**English 101**

What does uncanny and marvelous mean?

**Chem**

Calculate the percent yield of eugenol obtained considering the fact that clove oil is approximately 16-19 % clove by weight of cloves. isolated eugenol=061g purity of eugenol in clove oil=99.6% (based on clove oil gas chromatograph) Estimate the % yeild for eugenol.

**physics help**

wo thin rectangular sheets (0.13 m 0.52 m) are identical. In the first sheet the axis of rotation lies along the 0.13 m side, and in the second it lies along the 0.52 m side. The same torque is applied to each sheet. The first sheet, starting from rest, reaches its final angul...

**chemistry**

why sugar dissolve in cooking oil

**Chemistry**

By titration it is found that 68.9 mL of 0.122 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

**Chemistry**

The flask shown contains 10.0 mL of HCl and a few drops of phenolphthaein indicator. The buret contains 0.270 M NaOH. What volume of NaOH is needed to reach the end point of the titration? What was the initial concentration of HCl?

**Chemistry**

Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2(s)+ H2SO4(aq)---> BaSO4(s)+ H2O2(aq) How many milliliters of 3.00 M H2SO4(aq) are needed to react completly with 85.1g of BaO2(s)?

**Chemistry**

3.13g if CuNO3 is dissolved in water to make a 0.270 M solution. What is the volume of the solution?

**Chemistry**

Calculate the number of moles of solute in 18.33 mL of 0.1115 M K2Cr2O7(aq)

**chemistry**

How many grams of solute are present in 205 mL of .340 M KBr?

**Algebra**

Determine if the equation y = 2^x represents exponential growth or decay I thought at first it was growth but now I think it might be decay because there is no "b" in a parentheses so do I assume b is less than 1 so it's decay? Please help

**phyiscs**

A uniform plank of length 4.5 m and weight 233 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 454 N walk on the overhanging part of the plank before it just begins to tip?

**chemistry**

CO (g) + Cl2 (g) ↔ COCl2 (g In one experiment, 0.93 bar of CO was combined with 1.01 bars of Cl¬2 in a reaction vessel at 700K. After the system reached equilibrium, the total pressure was 1.24 bars. Calculate Kp0 for the system.

**physics help**

A 1.0 kg object is suspended from a vertical spring whose spring constant is 130 N/m. (a) Find the amount by which the spring is stretched from its unstrained length.

**science**

Are all materials in 3d why or why not?

**materials**

are all materials in 3d?

**physics help**

A 8.6 kg board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 186 N/m and is parallel to the floor. Find the amount by which the spring is stretched from its unstrained length.

**math**

63%

**Chem**

Can you please tell me if these are right? Classify the solutes in the following equations as a weak electrolyte, a strong electrolyte of a non electrolyte in water. a. XY2(s)=X2+(aq) +2Y-(aq) b. HX(g) ß=H+(aq) + X-(aq) c. XYZ(s)=XYZ(aq) d. YOH(s)=Y+(aq) + OH-(aq) a. str...

**integrals!!**

Compute the value of the integral using geometry. integral from -4 to 1 of (2x +8)dx

**calculus**

Referring to the Mean Value Theorem and Rolle's Theorem, how can I tell if f is continuous on the interval [a,b] and differentiable on (a,b).

**Chem**

Plese tell me if these are right. A 15.0-mL sample of NaCl solution has a mass of 15.78g. After the NaCl is evaporated to dryness, the dry salt residue has a mass of 3.26g. Calculate the following concentrations for the NaCl solution. a. %(m/m)= 3.26 x 100 / 15.78 = 20.7 b. %(...

**CHEM**

Will you please tell me if these are right? Write the symbol of the caton or anion that give(s) the following reaction:? 1. Forms a precipite with AgNO3 that does not dissolve in HNO3 2. Forms a gas with HCl 3. Give a bright, yellow-orange flame test 4. Forms a precipitate wit...

**english**

Imagine you are on a local commission appointed to study the lack of proper recreation facilities for youth in your neighborhood. Decide what facilities should be recommended. Write an appropriate resolution to be presented to your county government. Remember to give the reaso...

**Physics**

Initially sliding with a speed of 2.3 m/s , a 1.8 kg block collides with a spring and compresses it 0.36 m before coming to rest. WHat is the force constant of the spring?

**physics please help**

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) com...

**help me physics**

suppose the cart has mass m = 203 g, and it strikes the clay at speed vo = 5.24 m/s and comes to a dead stop. Assume the track is frictionless, and the clay is crushed inward by 1.83 cm. a)Find the magnitude of the impulse exerted by the clay on the cart. 1 N-m i got this answ...

**physics**

A 4111.0 kg truck is parked on a 14.6° slope. What is the friction force on the truck?

**physics**

A woman has a mass of 42.9 kg. What is her weight on earth? and what is her weight on the moon, where g=1.17 m/s2

**Calculus**

When air expands adiabatically (without gaining or losing heat), its pressure and volume are related by the equation where is a constant. Suppose that at a certain instant the volume is cubic centimeters and the pressure is kPa and is decreasing at a rate of kPa/minute. At wha...

**Calculus**

When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV1.4=C where C is a constant. Suppose that at a certain instant the volume is 470 cubic centimeters and the pressure is 89 kPa and is decreasing at a rate ...

**Physical Science**

an airplane is flying at 600km/h at an altitude of 2.0km. When the sound of the airplane's engines seems to someone on the ground to be coming from directly overhead, how far away is she from being directly below the airplane?

**Chem**

Would you please tell me if these are right? A sample of helium has a volume of 325 ml and a pressure of 655 mm hg. What will be the pressure if the helium is compressed to 125 ml (t and n are constant) I got 1703 mm of Hg A 75.0 ml sample of oxygen has a pressure of 1.50 atm....

**Chem**

Please tell me if these are right. How many grams are needed to obtain 1.5 moles of magnesium oxide? I got 60grams is this right? Write a balanced equation for the reaction of the magnesium and the oxygen including their physical states. I got 2Mg=Mg2+O2? Thank You!

**english**

In the answer area below, write the conjunction in the following sentence. Sentence: Give it to the boy or his mother. This doesn't seem like it should be difficult, but I want to make sure I understand. Is 'or' the conjunction?

**Chemistry**

Can you tell me if these are right please? When 2.50g of copper reacts with oxygen the copper oxide product has a mass of 2.81g. What is the simplest formula of the copper oxide. I got Cu2O (copper (I) oxide). Aluminum and oxygen gas react to produce aluminum oxide. A.) write ...

**english**

In the answer area below, write the 2 adverbs in this sentence and explain how each adverb is used. Example: Eventually, she walked proudly. Answer: eventually - eventually tells when she walked ; proudly - proudly tells how she walked Sentence: She walked very slowly into the...

**english**

List the nouns in the following sentence. Next to each noun - label whether it is concrete or abstract by writing a "C" or an "A." Sentence: In the midst of the excitement, Samuel lost his pencil on the bus. This is what I believe to be correct: excitement-...

**Physics #2**

A car can decelerate at -3.40 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 14° uphill? Assume the same static friction coefficient.

**Physics**

Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?

**Physics**

Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?

**algebra**

Two planes are 1,400 miles apart. They fly towards each other, one at 125 mph and the other at 175 mph. How long does it take the planes to pass each other (round to the nearest hundredth)?

**physics**

A cheetah is hunting. Its prey runs for 3.21 s at a constant velocity of +8.36 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time?

**physicS**

so thatd be H=dSin17.2 40.45m=dsin17.2 d=40.45/sin17.2 d=136.8 it all looks right, but for some reason incorrect, if anyone has a chance, can you check my math for me? i cant understand where i went wrong

**physicS**

A skier is gliding along at 6.93 m/s on horizontal, frictionless snow. He suddenly starts down a 17.2° incline. His speed at the bottom is 29.7 m/s. What is the length of the incline? i understand that the equation used is gH= change in (v^2)/2 so i plug in 9.8H=(29.7^2-6....

**college statistics**

In Chapter 5, Exercise 9, we studied the variability of crime rates and police expenditures in the eastern and Midwestern United States. We’ve now been asked to investigate the hypothesis that the number of crimes is related to police expenditures per capita because stat...

**Projectile Motion Physics**

An Arrow directed at a stationary target is shot at an angle of E25N. The arrow hits the intended target at the same height from which it is launched, 3.0s later. Determine the distance from the archer to the target.

**1st grade**

fine the rule

**math**

find the decimal notation for 63/3/8

**physics**

An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed? If this speed were increased by just 5.0%, how much longer would the jump be? I came up with a take off speed of 27.4 but the system is saying that is th...

**math**

nvm you dont have to answer this. i was told the wrong problem.

**math**

my friend asked me how to do this probelm and i could not figure it out for the live of me. its simple im pretty sure. (6-5i)/(6+5i) I tried using the conjugate method and my answer did not come out correct. can you please answer this?

**Chemistry **

A 0.25g sample of a pretzel is burned. The heat it gives of is used to heat 50.g of water from 18 to 42 degrees C. what is the caloric value of the pretzel in kcal/g? Can someone walk me through step by step?

**Chemistry **

175g of water was heated fro 15 to 88 degrees C. how many kilocalories were absorbed by the water? I got 94.5 kcal. Is this right?

**Chemistry. can jus anyone giv me ther opinion.**

k thank u

**Chemistry. can jus anyone giv me ther opinion.**

idk this is the question to a quiz im taking i askd my teacher and he didnt even kno what to say i think its D and i jus need to get this question rite and ill pass but if i miss it then i fail. i jus want as much help as i can get.

**Chemistry. can jus anyone giv me ther opinion.**

Eva has two containers labeled A and B. The diameter of container A is 8 inches and the diameter of container B is 12 inches. If Eva pours the water from container A into container B, which will occur? ---------------------------------------------------------------------------...

**English**

its talking about not quite understanding maturity in which a young person grows up to become an adult. for some its like watking thru a doorway and for others it seems they can't even get the door open.

**Chemistry...HELP!!!!**

In a reaction in which A + B yields AB, the reaction is referred to as a _________. A. decomposition reaction B. double-replacement reaction C. combustion reaction D. composition reaction i think is a

**Chemistry**

In a reaction in which A + B yields AB, the reaction is referred to as a _________. A. decomposition reaction B. double-replacement reaction C. combustion reaction D. composition reaction

**Economics**

Why has China begun an economic shift towards a free enterprise system?

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