Tuesday

February 21, 2017
Total # Posts: 2,481

**Chemistry**

these are (p*v)/t problems p=pressure v=volume t=temperature (in kelvin) it doesnt mention pressures in these problems so we assume it remains constant. the problems should be set up as: (Volume of initial)/(temp. of initial) = (volume of final)/(temp. of final) plug in and ...

*March 19, 2014*

**Maths,Tourism, science, Economics**

For three courses can able to do after grade 12

*March 12, 2014*

**Chemistry**

A 247 lb fullback runs the 40 yd dash at a speed of 17.09 ± 0.1 mi/h. (a) What is his de Broglie wavelength (in meters)? (b) What is the uncertainty in his position? ** I found part A but I am unsure how to use this information to get part B. Any help is appreciated :)

*March 11, 2014*

**Physics**

A truck and a bicycle are moving side by side with the same velocity. Which, if either, will require the larger impulse to bring it to a stop? a) The bicycle. b) The truck. c) Both will need the same impulse. d) There is not enough information to determine the answer.

*March 10, 2014*

**Physics**

The frequency of oscillation of a pendulum is 7 Hz. What is the period of oscillation?

*March 10, 2014*

**Physics**

A ball traveling with an initial momentum of 2.5 kg*m/s bounces off a wall and comes back in the opposite direction with a momentum of -2.5 kg*m/s. What impulse would be required to produce this change?

*March 10, 2014*

**Global Studies (Please help)**

im behind in my social studies and i would like to give a special thanks to eveyone here for helping, to any more future people the answers are infat a, d, a but you already know that, so ill be going i guess :)

*March 10, 2014*

**physics**

1. A ship has a top speed of 3.0 m/s in calm water. The current of the ocean tends to push the boat at 2.0 m/s on a bearing of due South. What will be the net velocity of the ship if the captain points his ship on a bearing of 55 North or West and applies full power?

*March 5, 2014*

**Science- Check Please :)**

Ok so #1 is correct but.... 2 and 3 are incorrect in my opinon. Photosynthesis produces glucose and oxygen which are the starting materials for cellular respiration and cellular respiration produces carbon dioxide and water, the starting materials used in photosynthesis. for #...

*March 5, 2014*

**math**

how do you do this problem h=2A/b1+b2 solve for b1

*March 3, 2014*

**English**

I m doing an analysis question on a poem called Question by May Swenson. The question says: Describe the prosody of the poem and comment on the effect of the initial substitutions of the meter. I do not even know where to start with this question, if you could help me out please.

*March 2, 2014*

**Chemistry (Thermodynamics)**

Write a balanced equation for the complete combustion of 1 mole of ethyne gas (C2H2) ?

*February 27, 2014*

**Math**

Nevermind, I understand!

*February 24, 2014*

**Math**

i'm not sure what you mean by up 10 and over thirty?

*February 24, 2014*

**Math**

Two poles are 20 feet tall and 30 feet tall, respectively. If they are 30 feet apart, how far is it from the top of one pole to the top of the other pole? Round your answer to the nearest tenth of a foot.

*February 24, 2014*

**College Physics**

A very long wire carries an I1 = 7.80 A current along the x axis and another long wire carries an I2 = 5.13 A current along the y axis. (I2 is directed upward on the y axis, and I1 is directed to the right on the x axis) What is the magnetic field at point P located at x = 4....

*February 23, 2014*

**Chemistry - check answers**

Can someone please check my answers and make sure they're correct? A) How much heat would it take to raise the temperature of 46.0 g of water from 90.0 to 100.0 C? Answer using correct sig figs, sign, and units. My answer: +1.92x10^3 J B) How many joules are released when ...

*February 23, 2014*

**Physic**

A large rock with a mass of 38.2 kg is rolling at a speed of 4.8 m/s. How much power is needed to stop the rock in 7.2 seconds?

*February 21, 2014*

**Personal Dimensions of Education**

are

*February 16, 2014*

**Physics**

arcsin(.178/1.19)=8.603

*February 15, 2014*

**Physics**

Whats the diameter of the sphere?

*February 14, 2014*

**Physics**

In a laboratory experiment, one end of a horizontal string is tied to a support while the other end passes over a frictionless pulley and is tied to a 2.6kg sphere. Students determine the frequencies of standing waves on the horizontal segment of the string, then they raise a ...

*February 14, 2014*

**Chemistry**

Got it, thanks!

*February 12, 2014*

**Chemistry**

Exactly 1.0 mole of oxygen and 7.0 moles of nitrogen gas are in a container. The total gas pressure is 5.7 atm. What is the partial pressure of nitrogen in atm? I'm not sure how to go about setting up the problem. Any help is appreciated!

*February 12, 2014*

**Data apps and healthcare statistics**

what are the categories of information systems, examples of each and their roles in the healthcare delivery

*February 9, 2014*

**Chemistry**

I wanted to make sure I knew the correct states. Thanks a lot for your help!

*February 8, 2014*

**Chemistry**

Write the chemical formula and number of ions formed when the following electrolyte dissolves in water. Make sure to include appropriate states. K3PO4 = ??? Any help with this is greatly appreciated!

*February 8, 2014*

**Science**

d,b,b,c,a these are the answers to that quick check i just took it and got 100% :)

*February 8, 2014*

**LA**

1.)1 2.)3 3.)2 4.)1

*February 6, 2014*

**physics**

A beach ball, moving with a speed of +1.28 m/s rolls off a pier and hits the water a horizontal distance of 0.74 m from the end of the pier. How high (magnitude only) above the water is the pie?

*February 4, 2014*

**PHY**

It is said that unlike charges attract. You should have observed that after the sticky side of a piece of scotch tape is pulled quickly off the smooth side of another piece of tape the tapes attract each other. Perhaps each tape has the same type of charge and the rule has ...

*January 31, 2014*

**ap chemistry**

a 0.76 mol sample of pcl5 is placed in a 500 ml reaction vessel. what is the concentration of pcl5 when the reaction pcl5(g) ⇀↽ pcl3(g) + cl2(g) has reached equilibrium at 250◦c (when kc = 1.8)

*January 31, 2014*

**AP Chem**

Predict whether the equilibria I) CO(g) + H2O(g) ⇀↽ CO2(g) + H2(g), ∆H ◦ = −41 kJ II) X2(g) ⇀↽ 2 X(g), where X is a halogen will shift toward products or reactants with a temperature increase.

*January 31, 2014*

**CERT IV in allied health**

Yes, what change could one suggest?

*January 30, 2014*

**CERT IV in allied health**

Make one suggestin to change workpractice in allied health facility How would you encourage team members to have positive attitude to the change you are suggesting?

*January 30, 2014*

**SAT**

Get you English up to the mark first before you attempt any tests.

*January 30, 2014*

**Data Management**

Expectation is that you'll be left with 0.8 cents, use a proability distribution chart to help you.

*January 21, 2014*

**World History**

What is the connection between Czar Nicholas II, mobilization, and WWI?

*January 13, 2014*

**Algebra 2**

Trying to help my daughter with her homework and im not sure how to do quadratic equations... Her question is X2(squared)+6=0 Im so lost!

*January 13, 2014*

**EARTH SCIENCE**

The answer is 1425 mL....because science is only measured using the metric system...

*January 7, 2014*

**Math**

"You have been asked to help build a rectangular play area at the new Tracy elementary school. You arrive at the site eager to begin! Much to your surprise, the only things available to work with are two pieces of rope. Explain how you can use the rope to find the ...

*December 20, 2013*

**statistics**

4. Are women getting taller? In one state, the average height of a woman aged 20 years or older is 63.7 inches in 1990. A random sample of 100 women is taken to test if women’s mean height today is different from 1990. The mean height of the 100 surveyed women is 63.9 ...

*December 16, 2013*

**science**

Thanks, I also got them all right, your to kind and have a blessed day.

*December 13, 2013*

**algebra**

How would you solve this one 40x^5-56x^4+24x^3 divided by -8x^2

*December 7, 2013*

**Bio**

What denotes the main relationship between protists and prokaryotes? do they both undergo transcription and translation? do they have different genetic codes?

*December 6, 2013*

**Math**

Suppose a baseball player had 211 hits in a season. In the given probability distribution, the random variable X represents the number of hits the player obtained in the game. x P(x) 0 0.1879 1 0.4106 2 0.2157 3 0.1174 4 0.0624 5 0.0060 a.) Compute and interpret the mean of ...

*November 26, 2013*

**Math help, anyone?**

11. would seem to me to be 9. It is fairly simply one to trick you. 12. x/4=6/7 multiply 6/7*4/x= 24/4 then simplify to get your answer. 15. 4 of 12 is 4/12 simplify

*November 26, 2013*

**Math**

0.90893

*November 22, 2013*

**Science**

Evolution and Biological Classifications 1.) what does a cladogram show? Answer: B = EVolutionary relationships between organisms 2.) Which pair below has the most shared derived characteristics? Answer: C = Cow, Horse 3.)Study the image below. Which pair of organisms is most ...

*November 18, 2013*

**algebra**

Remove the parentheses from the following expression, and combine like terms: (2x + 3y – 4z) – (x – y – z) A. 3x + 4y + 5z B. 3x + 4y – 3z C. x + 4y – 3z D. x + 2y – 5z

*November 17, 2013*

**Algebra**

–2x(–3x ^2y)(2y) = ? A. 12x^3y^2 B. –3xy^2 C. 3xy^2 D. –12x^3y^2

*November 17, 2013*

**really need help in math**

–2x(–3x 2y)(2y) = ? A. 12x3y2 B. –3xy2 C. 3xy2 D. –12x3y2 sorry that was the problem. i need help with this one. thanks xo

*November 15, 2013*

**really need help in math**

24x^2y^2 ?

*November 15, 2013*

**biochemistry**

i am currently doing an iodine value lab an error occured in my results and i do not know how to write up the conclusion and the discussion

*November 15, 2013*

**Circular motion Problem - moon completing an orbit**

Given that sidereal month, the amount of time it takes the moon to complete one orbit, is 27.332 days. How far is the moon from the earth?

*November 13, 2013*

**Circular motion Problem -Motorcycle HELP!!!?**

A motorcycle is traveling about a circle with radius of 15meters. If the coefficient of friction between the tires and the track is 0.76, how many laps can the motorcycle complete in one minute? (N o t e: Friction between the tires and the road enables a vehicle to turn)

*November 13, 2013*

**Circular motion Problem - Please! need HELP!!!fast**

An asteroid in space is attracted to the planet XYZ such that it accelerates at 0.0085 m/s^2 towards it. Given that planet XYZ has a mass of 4.7*10^24 kg. How far out from the planet is the asteroid?

*November 13, 2013*

**Fly Ball Lab - Projectile Motion Please HELP FAST!**

In this lab, you will perform graphical and mathematical analysis on a tennis ball that is struck by a bat. The data required for this lab is the horizontal displacement of the ball from the location where it was hit to the point where it first strikes the ground and the time ...

*November 12, 2013*

**Science**

This lesson is : Evidence of Evolution 1.) Which of the following explains why the a bone in a bird's wing is homologous to a bone in a lizard's front leg? ANSWER: D = the two species have a common ancestor 2.) A portion of the amino acid sequence of an enzyme taken ...

*November 10, 2013*

**physics-Gravitational Attraction(please help)**

1. The centers of two 11.80 kg spheres are separated by 0.09 m. What is their gravitational attraction? 2. What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? Please answer both Thank you

*November 9, 2013*

**physics**

Radius of Curvature A bicyclist traveling at 8 m/s rides around an unbanked curve. The coefficient of friction (is this static or kinetic friction?) between the tires and the road is 0.36. What is the radius of the shortest turn that the bicyclist can safely make? Please, ...

*November 9, 2013*

**physics**

Gravitational Attraction 1. The centers of two 11.80 kg spheres are separated by 0.09 m. What is their gravitational attraction? 2. What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? Please answer both, I'd be greatful. ...

*November 9, 2013*

**math**

What is the vertex of y=[-2x]?

*November 6, 2013*

**Physics**

When a person is given intravenous fluid, the bag containing the fluid is typically held about 1.2 m above the person's body. If the pressure in this fluid is just barely able to push the fluid into the person, what is the pressure in the person's blood? (The density ...

*November 3, 2013*

**English**

Which sentence is correct: They are planning a persons' party. or They are planning a people's party. I don't think either sounds correct, but these are the only choices!

*October 28, 2013*

**Statistics**

12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known allergies to poison ...

*October 24, 2013*

**Statistics**

12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known allergies to poison ...

*October 24, 2013*

**Statistics**

6)You are given the information that P(A) =0.30 and P(B) =0.40 (a) Do you have enough information to compute P(A or B)? Explain.(events A and B are mutually b) If you know that events A and B are mutually exclusive , do you have enough information to compute P(A or B)? Explain...

*October 24, 2013*

**Statistics**

a. Critical Thinking Critical Thinking Suppose you and a friend each take different random samples of data pairs (x,y) from the sample population. Assume the samples are the same size. Based on your samples, you compute r= 0.83. Based on her sample, your friend computes r = 0....

*October 20, 2013*

**Statistics**

A sociologist is interested in the relations between x=number of job changes and y=annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information: X(Number of job changes)4 ...

*October 20, 2013*

**Biology**

You wish to produce a human enzyme, protein A, by introducing its gene into bacteria. The genetically engineered bacteria make large amounts of protein A, but it is in the form of an insoluble aggregate with no enzymatic activity. Which of the following procedures might help ...

*October 10, 2013*

**Business**

no, D is wrong

*October 7, 2013*

**chemistry**

Consider the reaction between hydrogen and oxygen gases to form water: 2H2(g) + O2(g) ¨ 2H2O(l) Which of the following is not conserved in this reaction?

*September 30, 2013*

**intermediate algebra**

A local electronics store will sell seven AC adapters and two rechargeable flashlights for $86, or three AC adapters and four rechargeable flashlights for $84. What is the price of a single AC adapter and a single rechargeable flashlight?

*September 30, 2013*

**English**

what is nonfiction? it means that it is real so it is a "which a is an accurate statement."

*September 27, 2013*

**science**

An object with a mass of 70g and a volume of 100ml is most likely what substance

*September 26, 2013*

**Biochem**

Thank you!

*September 9, 2013*

**Biochem**

We will need 0.5L extraction buffer with 25 mM HEPES, 1 mM EDTA, and 1 mM DTT. Please calculate how many grams of each solute are needed. (HEPES 238.3; EDTA 292.2; DTT 154.2)

*September 9, 2013*

**small engane**

FIGURE A-9—This photo should be used to answer Question 15. 15. Two small engine technicians are disassembling the engine shown in Figure A-9. After observing the engine components, both technicians say that this engine has a splash-type lubrication system. Technician A ...

*September 5, 2013*

**Physics**

Identical point charges of +2.9 µC are fixed to three of the four corners of a square. What is the magnitude of the negative point charge that must be fixed to the fourth corner, so that the charge at the diagonally opposite corner experiences a net force of zero?

*September 4, 2013*

**Physics**

A hydrogen atom has a diameter of about 10.1 nm. Express this diameter in meters.

*August 26, 2013*

**Introduction to Physical Science**

thank you getting the hang of this

*August 22, 2013*

**Introduction to Physical Science**

How do you calculate the wavelength of the radio waves that are produced is 561 m, when electrons on a radio broadcasting tower are forced to oscillate up and down an antenna 535,000 times each second.

*August 22, 2013*

**economics**

the south african government is not providing enough welfare or subsidies to poor and underpriviledge?

*August 20, 2013*

**Algebra 1-Math**

There's a table that says Company A charges $0.36 plus 0.03. And Company B charges $0.06 per minute. The question Im having problems with are: How long is a call that costs the same amount no matter which company is used? Be sure to show your thinking?

*August 18, 2013*

**vocabulary**

___________definitions are subject to individual interpretation.

*August 12, 2013*

**algebra for business**

As an entrepreneur, there are going to be many decisions that you need to make, such as the price to charge your customers for your goods and services. You have just graduated from college and recently opened a specialty pizza restaurant. Based on surveys conducted in your ...

*August 11, 2013*

**geometry**

A cross country race course on flat ground has runners heading from point A for 3.5 km on a bearing of 047degT to point B. From point B they turn and run for 2.8 km on a bearing of 342degT to point C. They then run back to point A. Determine the Distance from C back to A.

*July 22, 2013*

**Statistics**

If 1000 raffle tickets were sold for a TV prize that is worth $275 and a ticket number is drawn to determine the winner, what is the expected value of the raffle?

*June 27, 2013*

**Trigonometry**

solve for all possible x in [0,2pi): (cscx+2)(cscx-√(2))=0

*June 26, 2013*

**Math**

P(7<x<9) when mu=7

*June 26, 2013*

**Math**

If P(F)=0.3, P(E or F) =.65 and P(E and F)=.15, find P(E)

*June 25, 2013*

**Applied Geometry maths**

How would I find out how far away from the base of the tower she was when she made her first measurement of 15deg20'

*June 19, 2013*

**Geometry**

40. Find the surface area of a conical grain storage tank that has a height of 42 meters and a diameter of 20 meters. Round the answer to the nearest square meter. (1 point) 3,028 m2 3,971 m2 1,357 m2 1,671 m2

*June 11, 2013*

**math**

.72222

*June 7, 2013*

**Writing help!**

1.In the bitter cold, (he, him) and Dad struggled to save the orange crop. My answer:he 2. (Her and me, She and I) have joined the Shutter and Lens. My answer:she and I 3. Phil showed Danny and (I, me) his butterfly collection. My answer:me 4. Bert warned Hank and (I, me) ...

*June 6, 2013*

**Writting**

Imagine that you are an agent who is interested in publishing new authors. Choose any book you like and present the book to a publisher in New York. You want to be the person responsible for putting the book on the shelf. You should convince the publisher that the book is well...

*June 4, 2013*

**Economics**

Explain the difference in prices for each of the following pairs of goods in terms of the laws of supply and demand: (a) natural diamonds and zircons (human-made diamonds), (b) a loaf of bread baked today compared with day-old bread, (c) roses in January and roses in June. ...

*June 4, 2013*

**Writting**

Persuasive Writing Assignment: Imagine that you are an agent who is interested in publishing new authors. Choose any book you like and present the book to a publisher in New York. You want to be the person responsible for putting the book on the shelf. You should convince the ...

*June 4, 2013*

**L.o**

Human or environmental problem under substance abuse. The impacts

*May 26, 2013*