Sunday

April 20, 2014

April 20, 2014

Total # Posts: 455

**chem**

Wow, I feel stupid...I need some sleep. Thanks so much!!

**chem**

Ok then, I got 750.81 torr. I know that Partial pressure = total pressure x the mole fraction Does this mean that I have to find moles of O2 and H2?

**chem**

I got .988atm, but what do I do with the temp?

**chem**

A sample of oxygen gas was collected via water displacement. Since the oxygen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 26.4 °C is 725 torr, what is the partial pressure of oxygen? The vapor pres...

**chemistry**

What is the density (in grams per liter) of a gas at STP if 4.16 L of the gas in a bulb at 43.7 °C, and 737.9 mm Hg weighs 0.262 g?

**Chemistry**

(NH4)2S is a strong electrolyte. Determine the concentration of each of the individual ions in a 0.200 M (NH4)2S solution. [NH4] = M [S] = M

**chemistry**

Knowing the concentration of a solution allows us to find all of the following except A. the mass of a solute. B. the mass of the solvent. C. the volume of the solvent. D. the concentration of a solution when conditions change.

**Algebra**

Neil gets in an elevator at the 30th floor and it begins to move downward at a speed of 8 feet per second. After 12 seconds the elevator is 240 feet above ground. a. Let y= the height in feet of the elevator 'x' secinds after Neil got in. Write an equation to show the ...

**Maths**

WhAt is x 3x9^x=81

**Chemistry**

Assume that the normal blood buffer contains 0.00080 M carbonic acid and 0.0085 M hydrogen carbonate, the pKa = 6.35 for carbonic acid and the volume of blood in the body is 7.00 L. The blood pH, due to disruption is now 7.20. What is the ratio of [HCO3−]/[H2CO3] now tha...

**Chemistry**

If you need to prepare 250.0 mL of a pH 5.00 buffer that has a total buffer concentration of acetic acid + sodium acetate of 0.050M, how many moles of each will you need to prepare the solution? Given solutions of acetic acid and sodium acetate with concentrations of 0.10M and...

**Math**

How do you factor 12v^2-25v-7?

**Chemistry**

How many lone pairs are in a chlorite ion (CLO2)- ?

**Chemistry**

What would be the speed of the following particles if they had the same wavelength as a photon of green light (λ = 500.0 nm)? Proton (mass = 1.673*10^(-24)g) =_____ neutron (mass = 1.675*10(-24)g) =_____ electron (mass = 9.109*10^(-28)g) =_____ alpha particle (mass = 6.64...

**Chemistry**

for both? and then add them?

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?

**Physics -URGENT-**

A 55 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.4 m/s^2, determine the magnitude of the acceleration of the boy toward the girl in m/s^2

**PHYSICS**

55 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.4 m/s 2 , determine the magnitude of the acceleration of the boy toward the girl in m/s^2

**Language Arts**

i have info about when it was invented and where it got its name from

**Language Arts**

yes I have some info on the history of the alphabet already.

**Language Arts**

can you help with a thesis statement about the history?

**Language Arts**

I am going to start with the history/ origin of the alphabet. Then I am going to talk about how it influences communication. What would be another point to sum that up?

**Language Arts**

I want to also incorporate the history

**Language Arts**

Its an informative speech on the alphabet.I want to talk about how the alphabet is essential in our daily lives and how everything in some form is based on knowing and understanding of the alphabet.

**Language Arts**

3 main points for a speech on the alphabet

**math**

suppose that an employee ears $28,000 in the first year on the job. Each year thereafter, the employee receives a %3 raise. Find the total amount that the employee earned in all 20 years.

**social studies**

which of the following groups benefitted the least from the prosperity of the second industrial revolution? a .textile workers b. railroad workers c. factory workers d. famers

**Physics**

I'm sorry, yes that is what I meant, but the difficulty I'm having is solving for z. I get it to a certain point and then I get stuck.

**Physics**

Consider the equation v = 1/8zxt2. The dimensions of the variables v, x, and t are [L]/[T], [L], and [T], respectively. The numerical factor 8 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the same dimensions? (Use t...

**physics**

The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is L = 81.0 m. In part (a) the person is looking at the base of the antenna, and his line of sight makes an angle of &...

**Biomechanics**

What will be the vertical velocity at take off for a high jumper in order for them to clear a height of 2m?

**math find the max/min**

f(x) = x2 + 2x - 9

**math**

What is the solution of the equation |2-x | =3

**Pre-calculus**

As you drive down a mountain, you see a sign that says there is a 6 degree grade over the next 5 miles. What is the change in elevation over that 5 mile stretch?

**math URGENT thx**

what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2

**math**

what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2

**Math**

The AC voltage coming out of a standard wall plug in the United States can be expressed as the function V(t) = 120sin(120*pi*t), where t represents time (in seconds) and V is the voltage. We will let t be greater than or equal to 0 for simplicity. A. Make an accurate sketch of...

**Precalculus with Trigonometry**

Calculate the work done by gravity as a 10 kg object is moved from point A = (0,0,0) to point B = (1,2,0). We are given s = (x sub f - x sub I)x(hat) + (y sub f - y sub I)y(hat) + (z sub f - z sub I)z(hat). Sorry if that doesn't make sense. I think I have to plug in the nu...

**Math**

If a Ferris wheel has a 64 m radius and the center ot the wheel is 84 m above the ground, what is the height of a carriage above the ground starting from 0 degrees to 360 degrees?

**orchestra programs????????**

New York Jazz Workshop if you're willing to commute to NY. They have fabulous programs for teens under a great teacher/performer.

**math**

thx so much!!!

**math**

Triangle ADE is inside rectangle ABCD. Point E is half way between points B and C on the rectangle. Since AB is 8 cm and side AD is 7 cm. 1. what is the area of triangle ADE? 2. what is the ratio of the area of the triangle ABE to the area of triangle ADE? 3. What is the ratio...

**math**

thank u

**math**

Raymond is planting a border of 48 seedlings that will completely surround a rectangular garden. He wants to plant the seedlings 2 feet apart. If the garden plot is 30 feet long, how wide should it be?

**Precalc with Trig**

There isn't a typo this is the equation my professor gave us, thanks for the help!

**Precalc with Trig**

What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0

**Precalc with Trig**

No, I don't just my professor trying to trick us, thanks for the help!

**Precalc with Trig**

What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0

**Precalculus with Trig**

Rewrite the following expression as an algebraic expression in x: cos(arcsin(x))

**Precalculus with Trigonometry**

Graph f(x) = sin(3x)/sin(x) - cos(3x)/cos(x) and make a conjecture. Prove your conjecture.

**Precalculus with Trigonometry**

Prove or disprove the following identity: cos (x+pi/6) +sin (x-pi/3) = 0

**math**

A model of a park was built on scale of 1.5cm to 50m. If the distance between two trees in the park is 150m, what is the distance on the model?

**Precalculus with Trigonometry**

Prove or disprove the following Identities: cos(-x) - sin(-x) = cos(x) + sin (x) sin raised to the 4 (theta) - cos raised to the 4 (theta) = sin squared (theta) - cos squared (theta) cos (x+(pi)/(6)) + sin (x - (pi)/(3)) = 0 cos(x+y)cos(x-y) = cos squared (x) - sin squared (y)...

**Precalculus with Trigonometry**

Draw and solve any triangles satisfying alpha = 20 degrees b = 10 c = 16

**Precalculus with Trigonometry**

What values of theta between 0 and 2pi solve the following equation? sin squared (2theta)-sin(2theta)-2=0 NOTE: if you choose to plot this, a good WINDOW is (0,2pi) x (-3,3).

**Precalculus with Trigonometry**

Prove or disprove the following identity: (sin(10x))/(sin(x)+sin(9x)) = (cos(5x))/(cos4x))

**Life orientation**

In 10 to 15 lines critically discuss 5 ways in which human or environmental problem impact on the community.Provide relevant sources to support

**Life orientation**

community organizations that are involved in supporting HIV

**Life orientation**

Community organizations that are involved in supporting HIV

**Life orientation**

In 10-15 lines,critically discuss 5 ways in which human or environmental problem impacts on the community.Provide relevant sources to support your claims.

**Math**

Which sentence will give the best estimate

**Physics**

A transformer has 25 turns in the primary coil and 200 turns in the secondary coil. If 12 V is connected to the primary coil and a 20-Ω device is connected to the secondary coil, calculate the current in Amperes passing through the device.

**Physics**

The primary of a step-down transformer connected to a 240 V source has 1000 turns. The secondary has 100 turns. What is the output voltage of this transformer?

**government**

During its early history, the British Parliament _____.

**satistics **

assume the probability that an electronic device will have a type 1 defect is 1% and the probability that it will have a type 2 defect is 2%. given that these two defects are not independent ,what is the probability that an item randomly selected has both a type 1 and type 2 d...

**math**

A rope is used to hold a tree upright. it is attached to the ground at a distance of 95 feet from the tree and forms an angle of 47 degree with the ground. How long is the rope to the nearest foot?

**Math**

Jen-Min wants to enlarge a 4 inch by 6 inch photo so that the longer side will be forteen inch how long will the shorter side be?

**math**

if part a of a square is one fourth and part c is one tenth then what is part b?

**Math**

A ship is traveling due north. Every 30 mins,the captain corrects his course by a certain number of degrees.Here are the corrections made during the first four hours of the voyage: 5,-7,3,2,-6,8,-4,-6 ps theres degrees in the numbers Note:in marine Navigation the course is the...

**Social Studies**

What did railroads contribute to the development of the west? Pls Help! Soical studies is my worst subject ever! Thanks if you can help!

**possesive nouns**

The sister of Miguel woke him up

**3rd grade math**

Jeff rodé his bike around a bike trail that was 1/3 of a mile long.He rode around the trail 9 times.Write a fraction greater than 1 for the distance.How many miles did Jeff ride?

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

**Chemistry**

A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

**Physics**

Compute the final temperature.

**Physics**

A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 499 cm ^ 3 of air at atmospheric pressure (1.01\times 10^5 Pa}) and a temperature of 27.0 degrees C. At the end of the stroke, the air has been comp...

**Physics or Math**

Yay thanks, thought it was simple thank you.

**Physics or Math**

I thought maybe I mixed up the order, and that I should have done (3,0,0) - (-1.3,2.4,0), point minus "effective origin" (the rotation axis) which makes more sense, this changes it to 12.67k, is that correct?

**Physics or Math**

A force F = 0.8 i + 2.5 j N is applied at the point x = 3.0 m, y = 0 m. Find the torque about the point x = -1.3 m, y = 2.4 m. Hmm, (this is essentially just a vector problem) I know you're supposed to find the position vector r and take the cross product of r x F, the fo...

**math**

3 sail boats to 6 fan boats

**Math**

The panels for the Pulsar 32-inch TV are manufactured in three locations and then shipped to the main plant for final assembly. Plants A, B, and C supply 50%, 30%, and 20%, respectively of the panels.The quality-control department of the company has determined that 1% of the p...

**Physics**

An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?

**physics**

A mass of 2.6 kg lies on a frictionless table, pulled by another mass of 4.7 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 .If the acceleration of the object has a magni- tude of 3.5 m/s2, what is the angle θ between the two force...

**Physics**

You will fire the spring gun 3 times from the first detent and measure the change in height of the (pendulum + ball) for each shot. Write the equation for the change in height of the first shot.

**algebra**

M --- +. 5= -2 3.

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the proce...

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the proce...

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the proce...

**Stats**

A large population has a mean of 200 and a standard deviation of 40. Which one of the following best describes the percentage of measurements that fall in an interval that is within two standard deviations of the mean?

**Physics**

The function ax(t) describes the acceleration of a particle moving along the x-axis. At time t=0, the particle is located at the position x0 and the velocity of the particle is zero. ax(t)=a0e−bt The numerical values of all parameters are listed below: x0=980 m a0=500 m...

**Physiology**

Why does a solution of Haemolysed red blood cells look clear instead of cloudy?

**Chem**

Can a 100ml sample of 3.0m H2 SO4 could be neutralized by 100 ml of 3.0m NH3

**College Physics**

A person who is properly constrained by an over-the shoulder seat belt has a good chance of surviving a car collision if the deceleration does not exceed about 30 "g"s (1.0 g= 9.8m/s^2) Assumind uniform deceleration of this calue calculate the distance over which the...

**Physics PLEASE HELP!**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2? I asked this today, and the person told me to do 0.029 * 6.022e23 and my answer was wrong :/ Can someone please tell me what my answer should be!!?

**Physics**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2?

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