# Posts by Kayla

Total # Posts: 1,463

**Chemistry**

H2 and F2 react according to the following equation, forming HF. H2(g) + F2(g) 2HF(g); H° = –271 kJ If H2(g) and F2(g) were mixed in a thermally insulated vessel, the reaction that occurred would be a. endothermic, and the temperature of the reaction ...

**Chemistry**

Bulb A is 100mL and contains Helium at 1atm. Bulb B is 500ml and contains Argon at 2atm The bulbs are connected together by a valve. (assume constant tempreature). What is the mole fraction of Argon in the opened system?

**Chemistry**

Would the total pressure be 2.19985 atm? Could you possibly help me with this one?

**Chemistry**

Bulb A is 100mL and contains Helium at 1atm. Bulb B is 500ml and contains Argon at 2atm The bulbs are connected together by a valve. (assume constant temperature). What is the total pressure of the system after the valves are opened?

**physics**

What is the electric field intensity produced by a charge at 10 meters, where the electric potential is 1.44 volts?

**Physics**

A disk in your computer spins at 5400 rpm. If this disk turns through 12 revolutions before coming to stop, find the disks angular velocity acceleration. Also find the time it takes to stop.

**physics**

How will changing charge change the equipotential at a distance of 2 meters? I honestly just don't even know where to start with this. If someone could at least point me in the right direction, that would be great!

**trig**

quadrant 1

**Science**

How do i calculate this? 5 ml of 0.1% (w/v) AgNO3 2 L of 1% (w/v) NaCl

**science**

it stores food.

**math**

Vance wants to fence in a rectangular area for his dog. He wants the length of the rectangle to be at least 30 feet and the perimeter to be no more than 150 feet.

**Math**

Tony wants to plant at least 40 acres of corn and at least 50 acres of soybeans. He wants no more than 200 acres of corn and soybeans. Show and describe all the possible combination's of the number of acres of corn and of soybeans Tony could plant. List two possible ...

**Math**

Linda works at a pharmacy for $15 an hour. She also babysits for $10 an hour. Linda needs to earn at least $90 per week, but she does not want to work more than 20 hours per week. Show and describe the number of hours Linda could work at each job to meet her goals. List two ...

**stats**

The percent of fat calories that a person that in America consumes each day is normallydistributed with a mean of 36 and a standard deviation of 10. Suppose that 16 individuals are randomly chosen for an experiment. 1. Completely describe the distribution of sample means for ...

**Stats**

1. If you were to receive $3 for every time a 7 or 11 was rolled with two fair dice and lost $1 for all the ther values, what is the expected value (mean) for you as a gambler in this experiment? (please show work so I know how to do it). 2. Going with the question above, ...

**Right angle trigonometry**

A sailor sights both the bottom and top of a lighthouse that is 20 and m high and which stands on the edge of a cliff. The two angles of elevation are 3 and 42. To the nearest meter, how far is the boat from the cliff?

**6th grade Math**

i can't figure out this problem 12 and 1/2 as a percentage... i need help

**Math**

Roulette is a well known game in which a mechanical device randomly selects one of 38 equally likely numbers. IF a player decides to play by choosing a number, he gains $35 if his number is selected by the device. If any other number is selceted he loses $1. Calculate the ...

**Math**

if the last digit of a weight measurement is equally likely to be any of the digits 0 through to 9.what is the probability that the last digit is greater than or equal to 5 ?

**English**

lol

**math ALG 2!**

The scientific notation 3.14 x 10 -3 has what value

**POLITICAL SCIENCE**

describe the European origins of American conservative and liberal ideologies. Then, explain how these two American ideologies have evolved from their European origins, and the key features of each American ideology today. Do “Tea Party” beliefs neatly fit in a ...

**AP Chemistry**

What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal reacts with excess water according to the chemical equation? 2Na(s)+2H20(l)=2NaOH(aq)+Hs(g) How many moles of Ag can be produced if 350. g of Cu are reacted with excess AgNO3 according to the ...

**Math**

67

**Science**

How do you do a Leg table in science?

**5th grade math (word problems)**

1. This one is ok. 2. The coffe cups should be divided by 8. If you were to make a drink for the club you would certainly have a drink. The answer is 30/8= 3.75; then you would multiply 8 * 3= 24; then you would subtract 30-24 you you would have 6 cups left.

**Lang. Arts**

Ther is non. B. is an interrupter.

**Math**

Graph 4x2 + y2 = 9. What are its lines of symmetry?

**Psychology**

Nothing. Some kids will choose not to let Mom or dad read to them. Some may take the opportunity and run with it. Reading to them does give them a better chance, but not a garnented chance of being able to read faster. The point is if you just read it's a story, but if you...

**Physics**

A 200-pound boy lifts a 40-kilogram box off of the floor 1.3 meters in 0.7 seconds. His brother lifts a 48-kilogram box off the floor 0.9 meters in 0.6 seconds. Which boy is more powerful? Explain.

**science**

a river does 6500J of work on a water wheel every second.The wheels efficiency is 12 percent.A)How much work in joules can the axle of the wheel do in a second? B)What is the power output of the wheel?

**fractions**

Adam can make the common denominator 12 because 6 and 3 go into it evenly. Then do 1/6x2=2/12 then you do 1/3x4=4/12!!!

**algebra**

(x^2)/25 - (y^2)/11 = 1

**physics**

oh no sorry nevermind it would be 2:1.. got it. Thanks man

**physics**

so is it a 1:2 ratio then? I have the options of 1:2 , 2:1, 1:3, and 3:1 on my homework. thanks for answering

**physics**

A proton and an electron enter perpendicular to the direction of the magnetic field. The speed of the proton is twice the speed of the electron. What is the ratio of the force experienced by the proton to the electron?

**physics**

Can someone please explain to me why or how this statement is true? I don't understand it.. Two events that are simultaneous in one inertial frame of reference will not necessarily be simultaneous in any other inertial frame of reference. Thank you

**physics**

ultra violet light

**Statistics**

If the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female. Use the normal distribution to approximate the binomial distribution.

**west chester university**

A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball is in the air for a total time of 8.26 s. What is its initial velocity? Neglect air resistance.

**math**

Carlos will use square floor tile that measure one foot on each side to cover a hallway that is eight feet long and four feet wide.how many floor tile will carlos need

**Science**

In lab the other day we did an acid/base extraction to separate mixtures. The top layer of the mixture is the organic layer, which consists of diethyl ether and fluorine. The bottom layer is considered to be the aqueous layer, which consists of water and benzoate anion. The ...

**physics**

Bert is standing on a ladder picking apples in his father's orchard. As he pulls each apple off the tree, he tosses it into a basket that sits on the ground 2.5 m below at a horizontal distance of 1.9 m from Bert. How fast must Bert throw the apples (horizontally) in order...

**geometry**

The price is$23

**algebra**

CA? me too :) b careful what u post and make sure u don't put ur name bc getting caught will lead to an automatic 0 on the quiz

**math**

Write a sequence of transformations that maps triangle ABC onto triangle A''B''C''. --------------------------------------… A in ABC is 1,9, B in ABC is 3,12, and C in ABC is 4,4. A'' in A''B''C'' is 3,-3, B''...

**Chemistry**

Adding 1.530x10^3 J of electrical energy to a constant-pressure calorimeter changes the water temperature from 20.50C to 21.85C. When 1.75g of a solid salt is dissolved in the water, the temperature falls from 21.85C to 21.44C. Find the value of qp for the solution process.

**Physics**

A hotair balloonist, rising vertically with a constant speed of 5.00 m/s, releases a sadndbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. a. compute the position and velocity of the sandbag at ....

**Physics**

A hotair balloonist, rising vertically with a constant speed of 5.00 m/s, releases a sadndbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. a. compute the position and velocity of the sandbag at ....

**Physics**

Okay. Thank you for your help

**Physics**

During 200 meter and 400 meter races, runners must stay in lanes as they go around a curved part of the track. If runners in two different lanes have exactly the same speed, will they also have exactly the same centripetal acceleration as they go around a curve? Explain.

**Chemistry**

How many types of stoichiometry are there? Can you list them? Thanks I appreciate it!

**Chemistry**

A sample of gas occupies 24.5 L at a pressure of 1.57 atm; what is the pressure if the volume is increased to 48.3 L?

**QUESTION**

can you please describe the chinese new year? and how its celebrated?

**living enviornment**

What structure is involved in carrying out each of the following life activities in the paramecium: A.INGESTION- B.DIGESTION- C.TRANSPORT- D.EXCRETION- E.WATER BALANCE- F.LOCOMOTION- G.REPRODUCTION- PLEASE HELP ME OUT

**Pre algebra**

5.4=y-1.5.+2.3

**Math...Please Help!**

Triangle ABC has coordinates A(1, 4); B(3, –2); and C(4, 2). Find the coordinates of the image A'B'C' after a reflection over the x-axis.

**Biology**

I need to answer the question Describe a series of small habitats that exist within 10 to 20 kilometers of your house and which might be subject to MacArthur and Wilson's theory of island biogeography. How do I know what small habitats exist around my house? I live with in...

**Physics**

A pendulum with a length of 2.0 m has a period of 2.8 sec. What is the period of a pendulum with a length of 8.0 m?

**ECE**

It is A. If you do not establish a plan of discipline then you job is pointless.

**calculus**

thank you!

**calculus**

Use left endpoints and 9 rectangles to find the approximation of the area of the region between the graph of the function cos2x and the x-axis over the interval [0, pi/2] . Round your answer to four decimal places.

**algebra**

a large group of students want to go to the movies. if the students take 3 vans and 1 car they can transport 22 people. if they take 2 vans and 4 cars. they can transport 28 people.write and solve a system of equations to find the number of people that can be transported in a ...

**Algebra**

domain is 4

**Physics**

A 155 N force is applied to the end of a 40 cm wrench at a angle of 45 degrees to the handle. What is the torque?

**Math**

-6(7x-1)<-8x+9(3x-4)

**Business Short Essay**

Thank you so much!

**Business Short Essay**

How should I start of a one page written assignment on the marketing failure of a company? What should the first paragraph include?

**Business / Marketing**

Thank you so much! Does RIM count as a market failure? Like.. its close to one I think.

**Business / Marketing**

What corporation/company recently had a market failure in 2012.. at least from September to now? I need one for my assignment, but can't think of find any.

**Math**

The depreciation rate, r, for a $50,000 news car is given by the function r = 1 - (V/50,000)^(1/5), where V is the value of the car when it is five years old. a) What is the depreciation rate for a $50,000 BMW that is worth $28,000 after 5 years? (I already found the answer to...

**math- unit rate**

what is the unit rate for 18:1.25

**algebra**

the polynomial that passes through the points of (7,13) (11,-12)(0,5)

**health**

i think its a?

**health**

What is stress management? A. Controlling and reducing the tension that occurs in stressful situations B. Controlling and reducing the tension that occurs in peaceful situations C. Controlling and reducing the happiness that occurs in peaceful situations D. Controlling and ...

**health**

Question 11 of 20 5.0 Points Regular physical activity appears to reduce symptoms of ________ for children and adolescents. A. Anxiety and depression B. Low self-esteem C. Identity or role confusion D. All of the above i think it is b?

**Physics**

For a single movable pulley with a mechanical advantage of 2, how much rope must be pulled to lift a 150 neuton load 2 meters above the ground?

**physics**

a jet plane traveling at +87 m/s lands on a runway and comes to rest in 11 s. a)Calculate its uniform acceleration b)Calculate the distance it travels

**math**

1 5/8

**math**

1 5/6

**math**

3 1/2 + 2 5/8 -4 1/4=

**math**

4 3/4 +3 1/2

**math**

help me! 2 3/5 + 1 4/5=

**Physics- PLEASE HELP**

When I followed that i got .26 meters and i think that is too small, right?

**Physics- PLEASE HELP**

A painter climbs a ladder leaning against a smooth wall. At a certain height, the ladder is on the verge of slipping. Let the mass of the painter be 69.0 kg, length = 2.80 m, the ladder’s mass to be 21.0 kg, θ = 57.0°, and the coefficient of friction between ...

**Physics- PLEASE HELP**

A painter climbs a ladder leaning against a smooth wall. At a certain height, the ladder is on the verge of slipping. Let the mass of the painter be 69.0 kg, length = 2.80 m, the ladder’s mass to be 21.0 kg, θ = 57.0°, and the coefficient of friction between ...

**Physics**

FOr my Tension 1 I am getting 7.875 and its wrong, im so confused what im doing wrong!

**Physics**

I am geting .875 for my acceleration and its saying its wrong! Was your value this small?

**Physics**

A 9.00 kg mass is connected by a light cord to a 1.00 kg mass on a smooth surface as shown in the figure. The pulley rotates about a frictionless axle and has a moment of inertia of 0.300 k∙m2 and a radius of 0.500 m. Assuming that the cord does not slip on the pulley, ...

**math**

3/50

**math**

add and subtract unlike fractions 3 over 50

**science**

give an example of a physical stimulus for touch, sight, and hearing. name the organs this sense is associated with.

**Pre- AP Physics**

The earth exerts a force of 2800 N on an or- biting communications satellite that is 31 mi above the Earth. What is the magnitude of the force the satellite will exert on the earth? Answerinunitsof N

**Geo**

A 30ffoot tree cast a12 foot shadow find the measure of the angle of elevation of the sun to the nearest degree.

**Chemistry**

How much heat is required to bring 1.0kg of water from 25 degrees celsius to 99 degrees celsius?

**Chemistry**

How much heat in kilojoules has to be removed from 225g of water to lower its temperature from 25.0 degrees celsius to 10.0 degrees celsius?

**Physics**

During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 4.11 s, how high does it rise?

**Physics**

A bullet is fired straight up from a gun with a muzzle velocity of 312 m/s. Neglecting air resistance, what will be its displacement after 1.4 s?

**Modern world studies**

7. The French philosopher Baron de Montesquieu believed that the power of a government __________.

**math**

how do you multiply monomials ?