Friday

July 25, 2014

July 25, 2014

Total # Posts: 631

**math**

In the diagram, the circle will be dilated by a scale factor of 3 about the origin. The points C, A, and B map to C', A', and B' after the dilation. What is the length of ? Use the distance formula to help you decide.

**physics**

A diver with a mass of 51 kg reaches a maximum height of 5.8 m above the water. When the diver has fallen 2.8 m from the apex, what is her kinetic energy (J)? Assume horizontal velocity is zero.

**math**

A woman buys a $ 78 necklace at a jewelry store. She gives the jeweler a check for $ 100. Because he does not have the $ 22 change, he goes to another merchant next door. There he exchanges the woman's check for $ 100 in cash. He returns and Gives the woman the necklace an...

**physics**

A mass m is gently placed on the end of a freely hanging spring. The mass then falls 21.3 cm before it stops and begins to rise. What is the frequency of the oscillation? I found the same question (with a different length) posted on here, but following the steps of the answer ...

**Calculus **

Compute the absolute and relative errors in using c to approximate x. x=e;c=2.68

**Physics **

A box is pushed down an incline from point A to point B by a force F (and also under the influence of its weight). The distance from A to B, along the ramp, is 5.0 m. The force F is parallel to the incline, as shown, and has a magnitude of 2.0 N. The force of kinetic friction ...

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?

**Physics**

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the collision?

**Spanish 2**

Can someone help me with these two? Thanks! :) Directions: Re-write the sentences in Spanish. The sentences are in all tenses. 1.) Include a direct or indirect object pronoun in the re-write: He used to buy books for the students. 2.) We have eaten breakfast. My answers: 1.)So...

**statistics**

A manufacturer ships toasters in cartons of 50. In each carton, they estimate a 2% chance that one of the toasters will need to be sent back for minor repairs. In a batch of 25,000 toasters, what are the chances that fewer than 475 need to be returned? The probability that few...

**spanish - HELP!**

Thank you!!

**science**

are these correct??

**chemistry**

1. How many different 4p orbitals are there? 2. How many radial nodes are there? 3. How many angular nodes are there? (excluding the radial nodes) I thought it was 2,1, 2??

**chemistry**

1. it takes: ____ electrons to fill the 6d subshell of an atom. 2. It takes _____ electrons to fill the n=6 shell of an atom. I thought it was 22 and 72?

**chemistry**

What is the velocity, in meters per second, of a beam of electrons if they are to display a "de Broglie" wavelength of 41.2 um?

**chemistry**

no, there is no diagram. they just say it: 8p1 is the orbital number. So n=8. but i'm stuck from there. Thank you for your help.

**chemistry**

What is the longest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 8p^1? Thank you!!

**chemistry**

Thank you!! You are so helpful!

**chemistry**

What is (delta E) for the traansition of an electron from n=9 to n=4 in a Bohr hydrogen atom? What is the frequency? Thank you!

**chemistry**

What is the wavelength, in nm, of light with an energy content of (1.35x10^3 kJ/mol)? Thank you!!!

**English 9 - HELP!**

I wanted you to check my answers. 1. c 2. c 3. a 4. c 5. a 6. d 7. b 8. e

**English 9 - HELP!**

1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along the hiking trail. (1 point) recently discovered quick...

**chemistry**

Given the following thermochemical equations, NO(g) + (1/2) Cl2(g) --> NOCl(g) -37.78 kJ (per mol NOCl) NO(g) + (1/2) O2(g) --> NO2(g) -56.53 kJ (per mol NO2) 2 NO2(g) --> N2O4(g) -58.03 kJ (per mol N2O4) what is the standard enthalpy change for the reaction below? N2...

**chemistry**

What is w when 1.27 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 133oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &q...

**chemistry**

A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this c...

**Math**

The area of a rectangle is 32 in.² the length is twice the width. what is the perimeter of the rectangle?

**chemistry**

A sample of gas is compressed from 13.57 L to 3.93 L using a constant external pressure of 2.91 atm. At the same time, 1,759 J of heat flows into the surroundings. What is the internal energy change for the gas?

**chemistry**

A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this c...

**chemistry**

How do you calculate the volume on the left and on the right?

**chemistry**

The enthalpy change for the reaction below at 25oC is -2,051 kJ (per mole of C10H22). What is the internal energy change for the reaction at 25oC? 10 CO(g) + 21 H2(g) --> C10H22(l) + 10 H2O(l) Enter your answer in kJ (per mole of C10H22), rounded to the nearest kilojoule.

**chemistry**

The standard enthalpy of combustion of C2H6O(l) is -1,367 kJ mol-1 at 298 K. What is the standard enthalpy of formation of C2H6O(l) at 298 K? Give your answer in kJ mol-1, rounded to the nearest kilojoule. Do not include units as part of your answer. Note: The standard enthalp...

**chemistry**

Given the following thermochemical equations, NO(g) + (1/2) Cl2(g) --> NOCl(g) -37.78 kJ (per mol NOCl) NO(g) + (1/2) O2(g) --> NO2(g) -56.53 kJ (per mol NO2) 2 NO2(g) --> N2O4(g) -58.03 kJ (per mol N2O4) what is the standard enthalpy change for the reaction below? N2...

**chemistry**

When a 6.79-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 369 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture? The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1...

**chemistry**

What is w when 1.27 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 133oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &q...

**chemistry**

Ah! okay! But thank you so much for answering a few!

**chemistry**

Hello, a few questions: Thanks so much! 1. The heat capacities of titanium and water are 0.522 J g-1 K-1 and 4.184 J g-1 K-1, respectively. What is the final temperature of the titanium-water mixture if a 175.0-g sample of titanium, initially at 90.0oC, is added to 50.0 g of w...

**Math**

A line in coordinate plane contains the points P(2, -7) and Q(-4, -1). What point is the midpoint of PQ?

**The Power of Media**

Ok, #1 is Which of the following is an example of a print medium? a.) a blog b.) a newspaper ******* c.) a magazine’s website d.) all of the above

**Is a blog a print media? yes or no?**

Oh ok, thanks!

**Is a blog a print media? yes or no?**

Is a blog a print media? yes or no? I think yes it is.

**chemistry**

we're in the same class!

**chemistry**

A 33.0-L cylinder contains 481 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 6.16 atm, assuming the temperature remains constant? Thanks! :D

**chemistry**

Hydrogen peroxide, H2O2, is used to disinfect contact lenses. What volume of O2, in mL, or O2(g) at 31 degree celsius, and 741mmHg can be liberated from 10.0mL of an aqueous solution containing 3.00% H2O2 by mass? The density of aqueous solution of H2O2 is 1.01g/mL. Thanks! :)

**Math ~ Need Help! ~**

Thnx

**Math ~ Need Help! ~**

• 1. Draw a segment and create a perpendicular bisector using the geometric construction techniques. • 2. Draw an angle and create an angle bisector using geometric construction techniques.

**Math! HELP!**

Can you help me with some graph ones?

**Math! HELP!**

Reiny, Steve!! I need help!

**Math! HELP!**

For questions 14-15, find the simplified form of each expression. (3/2b^4)^3 (3/5y^4)^-2

**Language Arts- Writeacher check again**

#2. Which is the correct MLA citation for a magazine article? a.) Brian Carson. ''The Real Story Behind Big Foot.'' Myths and Legends Mar. 2010: 20. Print. b.) Carson, Brain. ''The Real Story Behind Big Foot.'' Myths and Legends Mar. 2010: 20. ...

**Language Arts-check answer-**

ok

**Language Arts-Only 2 answers to check!**

I just need #2 and #3!

**Language Arts-check answer-**

#1. What is one thing a strong introduction does NOT do? a.) capture the reader's interest b.) present evidence to explain the topic******* c.) provide background information d.) state the main idea of the report #2. Which is the correct MLA citation for a magazine article...

**Language Arts ~CHECK MY ANSWERS~**

Read the following passage to answer #1 and #2. April 15, Miss Kinnian says I'm learning fast. She read some of the Progress Reports and she looked at me kind of funny. She says I'm a fine person and I'll show them all. I asked her why. She said never mind but I sh...

**Math**

a 16-foot ladder is leaning against a house and is 2 feet away from the foundation of the house. How high up will the ladder reach?

**Math, anyone, plz help**

What were 14 and 15?

**Homework help plz( Steve or Reiny)**

Did you get a solution to 14 or 15?

**Is the Cations and Anions right?**

Is the Cations and Anions right? Iron (III) Sulfate its F 3+ and SO2- Colbalt (II) Chloride its Co+ and Cl-2 Nickel (II) Chloride its Ni 2+ and Cl-2 Copper (II) Sulfate its CU+ and SO-4 Are these right?

**History**

The correct answer is India.

**History**

Thank you!

**History**

China but when I took the test it said that, that was wrong.

**History**

During the nineteenth century, which of the following countries experienced a decrease in industrial production? A. Britain B. China C. India D. Japan Not sure I think the answer is C.

**Art**

1. This is where an interior designer does most of her work. in a factory at the client's home in an office <<<<<<<<< in a studio 2. When looking at fabrics, an interior designer will focus on these characteristics. shape and form space and color...

**MATH**

Lucy was helping her parents construct a concrete birdbath in her backyard. they had a cone shape and a flattened cylinder. how did they put this birdbath together?

**science**

whats the uses of the element mercury?

**Mathematics**

A man received an invoice for a leaf blower for $478 dated April 17 with sales terms of 4/10 EOM. How much should he pay if he pays the bill on April 29? is it - 478-(478*4/100)= $458.88

**Mathematics**

296 :)

**Mathematics**

Find the amount of increase if 740 is increased by 40%

**Mathematics**

The formula Total cost = Cost + Shipping cost - Holding cost is used to find the total cost of a business asset. The formula can be written in symbols as T=C+S+H. Solve the formula for C, the the cost of the asset. C=

**Math**

One company has $200,000 to distribute in dividends. There are 21,000 shares of preferred stock that earn dividends at $0.70 per share and 80,000 shares of common stock. How much money goes to preferred stockholders?

**Mathematics**

thanks

**Mathematics**

Convert to years, expressed in decimal form to the nearest hundredth. 10 months

**Mathematics**

Find the amount of increase if 480 is increased by 10%

**math**

Thank you

**Science!**

By any chance. Have you figured the questions out?

**science**

Ithank you

**science**

An objects ______ does not change no matter where in the universe it is.

**science**

An objects _________ does not change no matter where in the university

**math**

What are all the 2 numbers thy equal 24

**Question About Math**

So #1 is A and #2 is D?

**Question About Math**

Hello! I have two math questions: 1.) Marcos has 28 coins that are all nickels (n) and dimes (d). The value of the coins is $2.05. Which system of equations can be used to find the number of nickels and the number the dimes? A. n + d = 28 5n + 10d = 205 B. n + d = 28 10n + 5d ...

**Science**

What process involves the comparison of rock layers with others in a sequence to determine its age? radioactive decay radiometric dating relative dating absolute dating To determine the most accurate and precise age of Earth's oldest rocks, geologists would use relative da...

**Math**

Thank ya'

**Math**

Thank ya'

**Math**

Help!?! 4x+49<9-x Thank ya ^.^ (^~\' my taco face lol ) (\:D-:) my cookie face lol )

**History**

What is the purpose of government?!?

**chemistry **

A sample of gas in a balloon has an initial temperature of 25\({\rm \, ^{\circ}C}\) and a volume of 1670\({\rm L}\) . If the temperature changes to 82\({\rm \, ^{\circ}C}\) , and there is no change of pressure or amount of gas, what is the new volume, \(\texttip{V_{\rm 2}}{V_2...

**Algebra /.-**

Thanks!

**Algebra /.-**

-4x-23=-107 Help!?!?

**History**

Will you please check my answers? 1. Which of the following is an example of new economic divisions in the European peasantry that began to occur during the fifteenth century? A. Peasants throughout Europe became poorer. B. Peasants living in the Balkans became freer. C. Peasa...

**science**

Explain what causes the tides to change

**ALGEBRA 1 **

A nonstop bus ride from the bus station in Atlantic City, New Jersey, to the bus station in Albany, New York, took 6 hours. If the average speeed of the bus was 21 meters per second , what is the distance between the two bus stations, to the nearest kilometer? A. 756 B. 454 C....

**Algebra 1**

For $46, Joel can rent a machine to make novelty buttons to sell at the county fair. The materials cost $0.39 per button. How many buttons must he sell at $1.40 each in order to make a profit. Identify the graph that shows all the possible answers. A: 45, 46, 47, 48....... B: ...

**Math**

In the figure below, points A, B, and C are collinear, and AB and BC are each 6 units long. If the area of ACD is 24 square units, how many units long is the altitude BD? A. 2 B. 4 C. 6 D. 8 E. 12

**Math**

Thank ya' ^.^

**Math**

5(2a + b)-2(3a-5b) Is the answer 4a+15b just checking

**Algebra 1**

You work in the local mailroom at a college. One of your duties is to sort local mail from all of the other mail. You can sort 8 pieces of mail in 10 seconds. How many pieces of mail should you be able to sort in 45 minuets?

**Math**

Help! Plz 3/4(x)=8

**Social studies (urgh!)**

^.^ :P

**Social studies (urgh!)**

Thanks love it!

**Social studies (urgh!)**

What would you draw for the word diverse/diversity?!? Definition: many & different

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