# Tiffany

Popular questions and responses by Tiffany-
## physics

A pitcher throws a 0.5kg ball of clay at a 6kg block of wood. The clay sticks to the wood on impact and their joint velocity afterwards is 3m/s. What is the original speed of the clay? I know the answer is 39m/s but I have no idea how they come up with

*asked on September 23, 2012* -
## General Chemistry

The problem is: Calculate the standard free-energy change for the following reaction at 25 degrees Celsius. 2Au^+3(aq) + 3Cr(s)-> 2Au(s) + 3Cr^+2(aq) I worked it out, getting half reaction: Au^3+ + 3e- -> Au; E = 1.498 Cr^3+ + 3e- -> Cr; E = -0.74 Ecell =

*asked on April 14, 2014* -
## Physics

A record player rotates a record at 45 revolutions per minute. When the record player is switched off, it makes 5 complete turns at a constant angular acceleration before coming to rest. What was the magnitude of the angular acceleration (in rads/s2) of

*asked on June 20, 2017* -
## Chemistry

if an excess of Al and 7.9 mol of Br2 are reacted in equation 2Al + 3Br2= 2AlBr2, how many moles of AlBr2 will be formed assuming a 100% yield

*asked on November 3, 2012* -
## General Education

Memmie: The greater the population near a restaurant, the more potential customers it has and the greater chance its popularity will spread through word-of-mouth. O’Sullivans Restaurant just opened in the very densely populated town of Redville, so its

*asked on July 20, 2014* -
## chem 2

calculate kc for reaction I2 (g)+Cl2 (g)⇌2ICl(g )Kp=81.9 (at 298 K)

*asked on October 6, 2013* -
## General Education

Aron: The two double A batteries in my CD player are dead, so the CD player doesn’t work. My television remote control, which also uses two double A batteries, works fine. So if I move the two batteries from my television remote control to my CD player,

*asked on July 20, 2014* -
## physics

A ball is thrown straight downward from the surface of the moon. Is the maximum height it reaches less than, equal to, or greater than the maximum height reached by a ball thrown upwards on the earth with the same initial speed? Ignore air resistance in

*asked on September 23, 2012* -
## ALGEBRA

A transformer has cooling fans that are set to come on when the temperature reaches 32° Celsius. The temperature is 90° Fahrenheit. Are the fans running?

*asked on July 2, 2012* -
## prob. statistics

a survey indicates that 41% of women in the us consider reading as their favorite leisure time activity. you randomly select 4 women and ask them if reading is their favorite leisure time activity. find the probability that exactly 2 of them said yes

*asked on December 13, 2010* -
## Beowulf question

Why was it harder for Beowulf to kill Grendel's mother than Grendel himself?

*asked on July 1, 2009* -
## calculus

Find the volume of the solid generated by revolving the region about the given line. The region in the second quadrant bounded above by the curve y = 16 - x2, below by the x-axis, and on the right by the y-axis, about the line x = 1 I have gathered, that

*asked on April 12, 2013* -
## chemistry

a 5% acetic acid solution contains -----grams of acetic acid per ------

*asked on November 11, 2010* -
## Grammar (will you check the rest please)

FIND THE ADVERB AND THE WORD IT MODIFIES 1. Mac looked everywhere for his jacket but could not find it.EVERYWHERE MODIFIES LOOKED AND FIND MODIFIES COULD 2. Tom threw the ball fast and hard. FAST, HARD MODIFIES THREW 3. Soon it will be time to go to sleep.

*asked on April 12, 2010* -
## Chemistry

Write and balance equation for the complete combustion of decane, C10H22

*asked on February 8, 2012* -
## Chemistry

A student placed 17.0 g of glucose (C_6H_{12}O_6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100 mL mark on the neck of the flask was reached. The flask was then shaken

*asked on July 7, 2010* -
## Physics

A cheetah can run approximately 100 km/hr and a gazelle at 80.0 km/hr. If both animals are running at full speed, with the gazelle 70.0 m ahead, how long before the cheetah catches its prey?

*asked on September 29, 2016* -
## Bus.Math

John O'Sullivan has just completed his first year in business. His records show that he spent the following in advertising: Newspaper $725 Radio $525 Yellow Pages $700 Local flyers $425 What percent of John's advertising was spent on the Yellow Pages?

*asked on May 16, 2012* -
## chemistry

how to write this as a net ionic equation? Al(s)+ H2SO4(aq)

*asked on April 22, 2008* -
## Math

A customer buys for products priced at $18 $22 $35 and $40 from the same store the customer returns the most expensive product and gets a refund for that one pot out how much money did the customer end up spending at that store

*asked on December 21, 2019* -
## Writing

Expository writing prompt: Describe a family celebration that has special meaning for you. Please give me some feedback. Every year my uncle celebrates Christmas at his house. Unlike the common Christmas party where people hand out presents to other

*asked on September 18, 2017* -
## General Education

Only circus animals with a clean bill of health will perform in today’s exhibition. A monkey, a poodle, and a horse will perform in today’s exhibition. No circus animals with a clean bill of health were prescribed medications this week. If the

*asked on July 20, 2014* -
## Chemistry

Calculate the total heat energy needed to convert 110g of ice at -10°C to steam at 110°C..?

*asked on February 25, 2014* -
## calculus

Which of the following are antiderivatives of f(x)=sinxcosx? I f(x)=(sin^2* x)/2 II f(x)=(cos^2* x)/2 III f(x)=-cos(2x)/4

*asked on March 11, 2012* -
## Chemistry

Determine the number of moles of oxygen atoms in each of the following. 5.91mol H2O2 2.7mol N2O 2.23mol CO2

*asked on July 7, 2010* -
## Physics

A small metal cylinder rests on a circular turntable that is rotating at a constant speed. The small metal cylinder has a mass of 0.20kg, the coefficient of static friction between the cylinder and the turntable is 0.080, and the cylinder is located 0.15m

*asked on September 28, 2009* -
## Physics

Josh starts his sled at the top of a 3.0m high hill that has a constant slope of 25 degrees. After reaching the bottom, he slides across a horizontal patch of snow. The hill is frictionless but the coefficient of kinetic friction between his sled and the

*asked on June 16, 2014* -
## Calculus

Find the area of the indicated region. We suggest you graph the curves to check whether one is above the other or whether they cross, and that you use technology to check your answer. Enclosed by y = x^2 − 4x + 1 and y = −x^2 + 4x − 5

*asked on December 11, 2013* -
## Chemistry

A mass of 0.4113 g of an unknown acid, HA, is titrated with NaOH. If the acid reacts with 28.10 mL of 0.1055 M NaOH, what is the molar mass of the acid?

*asked on April 28, 2012* -
## chemistry

What volume of 16 M nitric acid must be diluted with distilled water to prepare 500.0 mL of 0.50 M HNO3?

*asked on August 2, 2009* -
## Chemistry (College) URGENT

1.6g of an unknown monoprotic acid (HA) required 5.79 mL of a 0.35 M NaOH solution to reach the equivalence point. Determine the molar mass of the acid and given that the pH at the half way point to the equivalent point is 3.86. Calculate the Ka of the

*asked on October 29, 2012* -
## math

The earth is approx. a sphere. Its diameter is about 12 730 km. Water covers approx. 66 percent of the earths surface. How many square kilometres of land covers the earth?

*asked on July 24, 2012* -
## MATH (PLease HELp)

Sally has three times as many dimes as nickels and twice as many quarters as dimes.In all she has $5.55. How many coins of each type does she have? Let 2x=quarters 3x=dimes x=nickles

*asked on October 18, 2011* -
## Chemistry!!!

Is the molarity of a solution that contains 6 moles of solute in 2 liters of solution 12 M????

*asked on May 1, 2010* -
## math

how do you make 87 cents with 6 coins none of which are half dollars

*asked on March 1, 2012* -
## Chemistry

Give the formula of each of the following copper minerals: A. cuprite, copper (I) oxide B. chalcocite, copper (I) sulfide C. covellite, copper (II) sulfide

*asked on January 23, 2012* -
## Chemistry

NH4+ + OH- NH3 + H2O What is the K for the reaction above in terms of Ka's, Kb's, Kw etc.?

*asked on October 4, 2010* -
## Urgent-Chemistry Help

I need help with the heat effects and calorimetry worksheet. Please explain how to solve it! Thank you so much! A metal sample weighing 45.2g and at a temperature of 100.0 C was placed in 38.6g of water in a calorimeter at 25.6 C. At equilibrium the

*asked on December 4, 2006* -
## algebra

Decide whether the equation is an identity, a conditional equation, or a contradiction. Give the solution set. 2[3-(5-5x)] - x = -10 + 3(2 + 3x)

*asked on March 19, 2020* -
## Math

Perform the indicated operation and simplify the result if possible. 20 yd. 2 ft. + 12 yd. 2 ft.

*asked on February 19, 2019* -
## Math

On a Science exam Rita answered 36 questions correctly and receive a score of 100% her friend answered 27 questions correctly what score did read her friend receive

*asked on July 8, 2017* -
## computers

Wendy calls the help desk and reports that she is unable to access her files that are stored on the server. The network is a Windows Domain with Active Directory. Wendy is logged on locally to her workstation that runs Windows 8. You remote into her

*asked on December 23, 2014* -
## probability and statistics

Suppose every student in your class got a score of 85% on an exam. What are the mean and standard deviation of those exam scores without doing any calculations? I want to say the mean is 100 and the standard deviation is 1 but I don't know why. If all

*asked on June 17, 2014* -
## Spanish-3rd question

Cuáles son de espectáculo que te gusta? El circo es el espectáculo que me gusta.

*asked on March 13, 2012* -
## Chemistry

heptane and water do not mix, and heptane has a lower density (0.684g/mL) than water (1.00g/mL). A 100mL graduate cylinder with an inside diameter of 3.10 cm contains 39.90g of heptane and 34.00g of water. What is the combined height of the two liquid

*asked on January 21, 2012* -
## Math

the numbers M and N are different numbers selected from the first 25 counting numbers: If M is larger than N, what is the smallest value that M * N over M-N could have?

*asked on March 22, 2011* -
## Chemistry

A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 750 mL of a solution that has a concentration of Na^+ ions of 1.3 M? Express your answer numerically

*asked on July 7, 2010* -
## Physics I

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 61.2° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 20.5 m away. The rocket attains its launch speed in a negligibly short period of time,

*asked on February 7, 2010* -
## Chemistry

Find the volume of 0.250M sulfuric acid necessary to react completely with 79.3g sodium hydroxide

*asked on November 28, 2015* -
## Math 75

if you paid $120 to a loan company for the use of $2000 for 90 days, what annual rate of interest did they charge?

*asked on March 1, 2013* -
## Physics

Why are the tires for trucks carrying gasoline and other ﬂammable ﬂuids manufactured to be electrically conducting? 1. To make the truck easier to drive 2. To move the positive charges from the truck to the ground and avoid ﬁre 3. To neutralize the

*asked on February 7, 2013* -
## physics!

A 1.60-kg bottle of vintage wine is lying horizontally in a rack. The two surfaces on which the bottle rests are 90.0° apart, and the right surface makes an angle of 45.0° with respect to the horizontal. Each surface exerts a force on the bottle that is

*asked on February 7, 2011* -
## Chemistry

To increase the solubility of a gas at constant temperature from 1.20 g/L at 1.4 atm to 2.3 g/L what would the pressure have to be increased to?

*asked on May 1, 2010* -
## College-Chemistry

NaOH(s)+ H2SO4(aq)=Na2SO4(aq) + H2O(l) Consider the unbalanced equation above.A 0.900 g sample of impure NaOH was dissolved in water and required 37.0 mL of 0.145 M H2SO4 solution to react with the NaOH in the sample. What was the mass percent of NaOH in

*asked on February 26, 2010* -
## short stories

An individuated character is one who? A. Has his or her own unique history and personality. B. Is a symbol for some characteristic C. is able to be identified with the audience D. has a series of epiphanies

*asked on February 1, 2009* -
## college algebra

The half-life of carbon-14 is 5600 years. If a piece of charcoal made from the wood of a tree shows only 73% of the carbon-14 expected in living matter, when did the tree die?

*asked on December 6, 2015* -
## Chemistry

Calculate the mass of Fe(OH)3 s) produced by mixing 50.0 mL of 0.153 M KOH (aq) and 25.0 mL of 0.255 M Fe(NO3)3 (aq), and the number of moles of the excess reactant remaining in solution. I got 0.00383 mol Fe(NO3)3 remaining. I don't know how to obtain the

*asked on October 29, 2015* -
## Chemistry

Need help identifying organic functional groups of Mifepristone's lewis structure.

*asked on July 20, 2013* -
## math

An investor purchases 75 shares at 37.90 a share, holds the stock for 150 days, and then sells the stock for 41.20 a share. Find the annual interest rate earned. principal under 3000 3000-10,000 over 10,000 commission 32+1.8% of principal 56+1% of

*asked on March 1, 2013* -
## physics

HELP!!!A pitcher throws a 0.5kg ball of clay at a 6kg block of wood. The clay sticks to the wood on impact and their joint velocity afterwards is 3m/s. What is the original speed of the clay? I know the answer is 39m/s but I have no idea how they come up

*asked on September 24, 2012* -
## Physics

Work of 700 J is done by stirring an insulated beaker containing 110 g of water. (a) What is the change in the internal energy of the system? J (b) What is the change in the temperature of the water? °C

*asked on March 30, 2012* -
## Chemistry

A compound containing only C, H, and O was extracted from the bark of the sassafras tree. The combustion of 36.3mg produced 98.6 of CO2 and 20.2mg of H2O. The molar mass of the compound was 162 g/mol. Determine its empirical and molecular formulas

*asked on February 19, 2012* -
## Math

Solve for x log 1000=x

*asked on April 19, 2011* -
## Accounting

Need help with this bank reconciliation...this is actually for a job and I am forgetting everything about accounting because I am nervous. BANK RECONCILATION ============================================== On Aug 14th, One of our Partner's ( Compuville )

*asked on November 17, 2010* -
## math

if it takes 8 quarts of ice cream to feed 30 people, how many quarts will it take to feed 75 people?

*asked on July 6, 2010* -
## chemistry. Chl my answers please!

(1) To make NaTcO4, Tc metal is dissolved in nitric acid to make HTcO4, NO2 and H2O. Then the product HTcO4 is treated with NaOH to make NaTcO4. If you begin with 4.5 mg of Tc metal, how much of NaOH (in grams) is required to convert all of the HTcO4 into

*asked on December 3, 2008* -
## math

Write an equation of the line that passes through(6, -10) and is parallel to the line x = 5.

*asked on September 23, 2008* -
## math

10050 10110 10130 10200 10500 10550 10559 in roamn numerals plz http://www.novaroma.org/via_romana/numbers.html Let us know what you think it is and we'll give you feedback. =)

*asked on February 16, 2007* -
## Algebra

A museum charges $14.50 for a one day youth admission and $18.50 for a one day adult admission. One Friday, the museum collected $1694 From a total of 108 youths and adults . How many admissions of each type were sold?

*asked on May 6, 2020* -
## Math

Alexis pours 3/4 cup of juice in 6 glasses. How many cups does Alexis have?

*asked on April 18, 2018* -
## Brief Calculus

The demand function for a certain brand of CD is given by p = −0.01x2 − 0.2x + 12 where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. The supply function is given by p = 0.01x^2 + 0.5x + 3

*asked on August 3, 2016* -
## Math

Find the circumference of 15in and round your answer to the nearest tenth

*asked on February 26, 2016* -
## Physics 202

A rail gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass 10.0g and electrical resistance 0.100Ω

*asked on February 17, 2015* -
## psychology

Can someone give me an example of correlation and causation.

*asked on April 16, 2014* -
## Physics

A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of −4.9 µC. How many electrons are transferred from the wool shirt to the plastic rod? The elemental charge is 1.6 × 10^-19C.

*asked on February 7, 2013* -
## physics

the mass density of a mixture of ethyl alcohol and water is 950kg/m^3. is the mixture mostly water, alcohol, or about half and half. What is your reasoning?

*asked on October 1, 2012* -
## Philosophy: Introduction to Logic

1.) (L=N) > C 2.) (L=N) v (P>~E) 3.) ~E > C 4.) ~C /~P

*asked on February 13, 2012* -
## spanish

In the following sentences, change the position of the reflexive pronouns so that sentences retain their meaning. Have the correct account punctuation and accentuation. 1. Ellos vienen a despedirse esta noche 2. Daniel se esta afeitando 3. Patricia va a

*asked on February 8, 2012* -
## Physics!!

During a circus performance, a 73.1-kg human cannonball is shot out of a 19.5-m-long cannon. If the human cannonball spends 0.921 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.

*asked on February 2, 2011* -
## statistics

A manufacturer of computer disks has a historical defective rate of .001. What is the probability that in a batch oof 1000 disks, 2 would be defective?

*asked on January 23, 2011* -
## algebra

The length of a rectangle is 6 cm more than four times the width. If the perimeter of the rectangle is 42 cm, what are its dimensions? a. length = 18 cm; width = 3 cm b. length = 18 cm; width = 9 cm c. length = 6 cm; width = 9 cm d. length = 3 cm; width =

*asked on January 20, 2011* -
## english

How does " an occurence at owl creek bridge" a reflection of the period of time?

*asked on January 19, 2011* -
## Chemistry

3H2(g)+N2(g)=2NH3(g) Suppose the equilibrium constant Kp = 0.003337 for the reaction above. If the equilibrium mixture contains partial pressures H2 = 0.400 atm and N2 = 0.350 atm. What is the equilibrium partial pressure of NH3 in atm?

*asked on September 23, 2010* -
## Grammar (will you check these please)

Rewrite the sentence or phrase using comparative form of the adverb 1. Approach slowly. = Approach more slowly. 2. Get well. = Get better. 5. Come quickly. = Come more quickly. 6. favorably received = most favorably received 8. far away = farther away 9.

*asked on April 26, 2010* -
## Chemistry

CS2(g) + O2(g) CO2(g) + SO2(g) (a) Consider the unbalanced equation above. What is the maximum mass of SO2 that can be produced when 46.0 g of CS2 and 29.0 g O2 react? (b) Assume the reaction in part (a) goes to completion. Calculate the mass of excess

*asked on February 28, 2010* -
## Chemistry

how many grams of NaCN would you need to dossolve in enough water to make exactly 250.0mL of soultion with pH of 10.00?

*asked on February 22, 2010* -
## physics

A cable is lifting a construction worker and a crate, as the drawing shows. The weights of the worker and crate are 930 and 1640 N, respectively. The acceleration of the cable is 0.620 m/s2, upward. (a) What is the tension in the cable below the worker?

*asked on February 15, 2010* -
## Physics

When you drive down the highway, you are moving through space. What else are you moving through?

*asked on April 30, 2008* -
## chemistry

What volume of oxygen gas will be produced when 13.5 g of potassium chlorate is decomposed at STP? 2KClO3(s) → 2KCl(s) + 3 O2(g)

*asked on May 6, 2020* -
## chemistry

If a 0.500 mole of carbon disulfide reacts with oxygen completely, what would be the total volume of the products at STP? CS2(l) + 3 O2(g) → CO2(g) + 2 SO2(g)

*asked on May 6, 2020* -
## math

James bought a few hamsters. For each day after the first day of the week, the hamsters ate 20 grams of food more than the previous day. The hamsters grew fast, finishing 1260 grams of food in the first week. How much food did the hamster eat on the first

*asked on October 25, 2018* -
## Writing

Expository writing prompt: Why is diversity in a workplace important? Please give me some feedback. It is not uncommon to hear employers emphasize the importance of diversity in a workplace. Diversity is important in a workplace because it creates an

*asked on September 18, 2017* -
## Writing

The essay below is an expository essay and was written in 15 minutes. Please give me some feedback on my essay ( a score of 1 being the lowest and a score of 5 being the highest). Prompt: Explore how obesity affects a nation's productivity and economy. My

*asked on September 18, 2017* -
## Algebra

A manuscript needs to be printed. One printer can do the job in 60 minutes and the other can do it in 40 minutes. How long would it take if both printers were used?

*asked on April 19, 2017* -
## Math

The wingspan of a Boeing 747-400 is 64.4 metres. a. If a scale model is built to the scale 1:20, what would the wingspan of the model be in centimetres? b. If the wingspan of another model is 53 cm, find the scale of the model in the form 1:x.

*asked on September 11, 2016* -
## Chemistry

Calculate the mass of Fe(OH)3 s) produced by mixing 50.0 mL of 0.153 M KOH (aq) and 25.0 mL of 0.255 M Fe(NO3)3 (aq), and the number of moles of the excess reactant remaining in solution. I got 0.242 g Fe(OH)3 and 3.83 mmol Fe3+ remaining.

*asked on October 28, 2015* -
## Chemistry -Dr.Bob

Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1ppm arsenic (As)? DrBob222 1 ppm = 1 mg/L and although

*asked on October 25, 2015* -
## Chemistry

Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1ppm arsenic (As)?

*asked on October 23, 2015* -
## Algebra

Ticket sale for a music concert was $2,160. Three times as many tickets were sold for the Saturday night concert as were sold for the Sunday afternoon concert. Two times as many tickets were sold for the Friday night concert as were sold for the Sunday

*asked on October 22, 2015* -
## Chemistry

1. Iron oxide and carbon monoxide react according to the following equation . Identify which reactant is limiting and which is excess if 43.5 grams of Fe2O3 reacts with 43.5 grams of CO Fe2O3 + 3CO2 --> 3CO2 + 2Fe 2. Calculate the percent yield of Carbon

*asked on March 19, 2015*