# Posts by Tiffany

Total # Posts: 930

**Chemistry**

If I have 1.93 x 10^-6 mole of chromium that would equal 100.35 mcg correct?

**Chemistry**

If I have 40mg of potassium, that would be how many moles of potassium? mols= grams/atomic number 0.04g/39.0983= .001023062 would equal 1.02 x 10^-3 correct? Did I do this problem correctly?

**calculus**

1.Ruth has 240 feet of fencing available to enclose a rectangular field. Express the area A of the rectangular field as a function x, where x is the length of the field. 2. For what value of x is the area largest? 3. What is the maximum area?

**Math**

If I had to report calculations precision to +/-1, 23.40-18.2= 5.2 948.75+62.45=1011.20 Would those answers be correct?

**Chemistry**

When one gram of gas, is burned, 55.5kJ of heat are released. How many pounds of methane gas must be burned to release 2.578 x 10^3kJ of heat?

**smith**

The Smiths want to buy a 9 ft. by 12 ft. carpet and center it in a 15 ft. by 20 ft. room. What is the area of the carpet?

**math**

What is the molarity of a 15%w/v HCl solution (GMW=36.46)?

**math**

give x has a poisson distribution with mean=1.6 what is the probability that x=9

**math**

sam burned a CD with 6 songs how many ways can Sam arrange songs on a CD

**math**

Suppose a third world country in the last five years is now expanding their Internet access. If they went from 2.5% of their citizens having access to the Internet to 7.5% now having access, calculate the following: a) How many percentage points did they increase in access? b...

**Writing skills 1**

12. Sentence (i) has been shortened in sentence (ii) by using a(n) _______. (i) She likes a location that is in the sun. (ii) She likes a sunny location.

**computers**

why is payroll for employees and human resources listed as a co-number 11 business priority

**Calculus**

The limits are 0,3

**Calculus**

It is y^(2/3) - we have not gone over shell method yet so.....

**Calculus**

Find the volume using the shell method - about the x-axis x=y^2/3

**calculus**

Where does the 4/3 and 3/2 come from? Thank you

**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 washer method is to be...

**exponential equation**

Solve the exponential equation e^x + e^-x = 6

**Math**

4/7

**chemistry**

0.0048 ml

**Physics**

The current in a 5.00mH inductor drops from 2.50A to zero in 5.ooms. What is the average emf induced in he inductor?

**math**

Eric plays piano and guitar. He practiced on both instruments for a total of 8 hours this week. He practiced the piano for 1/4 of that time. For how many hours did Eric practice the piano this week?

**Physics**

A battery with an emf of 7.9 V and internal resistance of 1.37 Ω is connected across a load resistor R.If the current in the circuit is 0.88 A, what is the value of R? Answer in units of Ω What power is dissipated in the internal resistance of the battery? Answer ...

**Physics**

If the emf of a battery is 23 V and a current of 66 A is measured when the battery is shorted, what is the internal resistance of the battery? Answer in units of Ω How would you set up the equation to solve?

**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 principal 106+0.5% of principal

**math**

George finds a company that charges 59 cnets per day for each 1000 borrowed. if he borrows 3000 for 60 days, what amount will he repay, and what annual interest rate will he pay the company?

**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?

**math**

A woman 5ft 6in tall stands so that the tip of her shadow coincides with the tip of the shadow of a tall tree. The woman stands 18 ft from the tip of her shadow and 100 ft from the base of the tree. How tall is the tree?

**algebra**

what is 0.0446 rounded to the nearest hundredth of a percent

**Math**

How did you get that?

**Math**

factor the polynomials using whatever strategy seems appropriate. 12m^2n^2-8mn+1

**Help math calc**

Find the future value of $700 deposited at 3% for 9 years if the account pays simple interest and the account pays compounded annually? The future value of an account that pays simple interest is what?

**Math college**

Find the future value of $700 deposited at 3% for 7 years if the account pays simple interest and the account pays interest compounded annually

**Mth**

Find the slope of the line. 2x-4y=2

**Chemistry**

A solution contains 314 mg/L of Ca2 . What is the solution in nmol/m3?

**Physics**

We want to ﬁnd how much charge is on the electrons in a nickel coin. Follow this method. A nickel coin has a mass of about 4.9 g. Find the number of atoms in a nickel coin. Each mole (6.02 × 10 23 atoms) has a mass of about 58.1 g. Answer in units of atoms Find ...

**Physics**

An electroscope is a simple device consisting of a metal ball that is attached by a conductor to two thin leaves of metal foil protected from air disturbance in a jar. When the ball is touched by a charged body, the leaves that normally hang straight down, spread apart. Why? 1...

**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.

**Physics**

In a crystal of salt there are electrons and positive ions. How does the net charge of the electrons compare with the net charge of the ions? 1. Unable to determine 2. Sometimes the net charge of the negative electrons is greater than the net charge of the ions and sometimes ...

**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 charges...

**Physics**

At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the purpose of this wire? 1. To warn the drivers 2. To count the vehicles 3. To transfer positive particles to the ...

**math**

a baker made 100 dozen cookies she sold 3/5 of them before noon how many dozen were sold before noon

**Physics**

You have collected exactly 2800 aluminum cans for recycling, each with a mass of 13.6 g. How much energy is needed to melt them if their initial temperature is 26.2◦C? Assume the specific heat, the latent heat and the melting point of aluminum are 899 J/kg ·◦...

**Physics**

How much energy is required to change a 58 g ice cube from ice at −1◦C to steam at 101◦C? The specific heat of ice is 2090 J/kg ·◦ C and of water 4186 J/kg ·◦ C. The latent heat of fusion of water is 3.33 × 105 J/kg, its latent...

**Physics**

You have collected exactly 2800 aluminum cans for recycling, each with a mass of 13.6 g. How much energy is needed to melt them if their initial temperature is 26.2◦C? Assume the specific heat, the latent heat and the melting point of aluminum are 899 J/kg ·◦...

**Physics**

A 123 g cube of ice at 0◦C is dropped into 1.9 kg of water that was originally at 81◦C. What is the final temperature of the water after after the ice melts? The latent heat of fusion of water is 3.33 × 105 J/kg . Answer in units of ◦C

**physics**

How do your measured values of centripetal force compare to the calculated values of centripetal force?

**science**

How do you slove f=ma when a golfball weighs 45.9g and is going down a 13inch board at 0.5 seconds??

**math**

3(y-7)= 5y-19

**physics**

nucleus of oxygen-15 undergoes electron capture. Write out the reaction equation and determine the identity of the daughter nucleus

**physics**

nucleus of oxygen-15 undergoes electron capture. Write out the reaction equation and determine the identity of the daughter nucleus

**physics**

nucleus of oxygen-15 undergoes electron capture. Write out the reaction equation and determine the identity of the daughter nucleus

**Math**

Write the fraction in simplest form. 14. 18/48 15. 42/81 16. 32a / 8a squared 17. 15 b / 39b ( little 4)

**Math**

A store sells a pack of 10 baseball cards for $4.95 or five 10-packs for $49.95. Which would be the better buy?

**Math**

A 10-oz bottle of juice costs $1.49. A 30-oz bottle cost $4.25. Which is the better buy?

**Physics**

The ends of a light string are tied to two hooks A and B in a ceiling which are 100 cm apart horizontally so that the length between hooks is 140 cm. A 650g mass is then attached by a second length of string to a point C on the first, 80 cm from A, and hangs freely. Find, by ...

**Math**

i am a three digit decimal whose digit in the tenths place is 4 times the digit in the hundredths place and 4 more than the digit in the thousandths place. who am i?

**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

**AP Psychology**

elevating arousal and mood

**Physics**

Given that the Sun has a mass 333,000 times larger than Earth’s mass and Earth has an average distance of 1.49 x 1011 m from the Sun, at what distance from the Sun is the center of mass of the Earth-Sun system? a. 1.00 m b. 4.47 x 105 m c. zero d. 333,000 m e. 1.49 x ...

**math**

(7-2x)(4+x)

**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 unknown acid.

**algebra**

Two pumps can fill a water tank in 256 minutes when working together. Alone, the second pump takes times as long as the first to fill the tank. How many minutes would it take the first pump to fill the tank?

**Physics**

A golf ball of mass 30.0 grams is struck by a 4.00 kg golf club for a time of 3.00 ms. If the golf ball obtains a velocity of 25.0 m/s after being struck then with what force did the club strike the golf ball? a. 2.50 N b. 7.50 N c. 250 N d. 750 N e. 25.0 N

**physics**

the frequency of middle C on a piano is 261.6hz. What is the wavelength of sound as it travels @room air and in water?

**physics**

what frequency of sound travels in air @20 degree C has a wavelength equal to 1.7m?

**physics**

In the past, ships often carried small cannons that wer used when approaching shore in a dense fog to estimate the distance to the hidden land. How would this work?

**physics**

how to calculate the speed of sound at temp of -83F and 135F?

**Chemistry**

How do you do this problem? Calcuate the mass of CuCl2*5H2O required for preparing 400mL solution that of .25M in chloride ions.

**history**

As ratified in 1870, the _______ Amendment prohibited any state from denying the vote to any male citizen on account of race, color, or previous condition of servitude. A. Thirteenth B. Sixteenth C. Fifteenth D. Fourteenth

**history**

In the Battle of _______, a disastrous charge against forces holding Cemetery Ridge led to Confederate defeat A. Cold Harbor B. Vicksburg C. Antietam D. Gettysburg

**american history**

Which of the following nineteenth-century inventors is associated with Menlo Park in New Jersey? A. Cyrus W. Field B. Thomas Alva Edison C. Alexander Graham Bell D. Gustavus F. Swift

**college physics**

By immersing a crown in water its volume is 26inc^3=4.2x10^-4m^3. what would its weight be if it were pure gold? What would its weight be if its volume were half gold and half lead?

**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?

**anthropology**

Amok (murderous raging) in Malaysian culture, susto (e.g., spirit attack) in Latin America, and fright in Caribbean Creole are all examples of____

**Physics**

A crate of mass 50.0 kg rests on a flat surface, and there is a coefficient of static friction of 0.200 between the crate and the surface. A person pushed on the crate with a force of 5.00 N at an angle of 25.0 degrees below the horizontal. Will the crate move? If it does move...

**Physics**

Given a wooden sign that is held up by two ropes. One rope at a 37.0 degrees to the horizontal has a tension of 2.00N and the other at an angle of 153.5 degrees to the horizontal feels a tension of 1.785N. How much does the sign weight?

**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 with that

**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 that

**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 both cases

**Accounting**

. Classify the following items as (a) an addition to the bank balance, (b) a subtraction from the bank balance, (c) an addition to the book balance, or (d) a subtraction from the book balance: _____ $20 in service charges _____ A $300 check deposited that was returned NSF ...

**math**

from 1am to 5am the temperature dropped 16 degrees what was the average change in temperature per hour

**math**

to find a lenght of a line segment over AB , with endpoints A(-7,5) & B(4,-6) you can use the ....?

**Math**

A. What do you get when you use your calculator to divide by 84 and 14? What does this tell you about 14 and 84? B. What do you get when you use your calculator to divide 84 and 15? What does this tell you about 15 and 84

**healthcare**

Write a memo to the staff of all 3 of Kyosha Valley’s locations and include the following information: 1.Explain the uniform policy. 2.Explain the expectations of staff with regard to teamwork in keeping the office and bathrooms clean during the day and in between ...

**Reading**

because everything is grey

**Physics**

Why is parallel circuit brighter compared to series? ( Only one bulb is present in both circuits) Thanks :)

**algebra**

Problems with simple interest loan, how would I go by determining the amount?

**math**

got my answer but thanx anyway

**math**

would it be b^2 =3v/h ???

**math**

does anyone know the formula for finding the base of a square based pyramid when u have the volume and height ?

**art history**

Discuss how the Italo-Byzantine sense can be seen as an evident in Berlinghieri’s St. Francis Altarpiece

**please help! :( math!**

transformations :)

**math**

thank-you soooo much ms.sue

**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?

**government**

Courts issued court orders, or i-j--cti---, to make sure that people of color were allowed to vote.

**2008 math**

Write the following as a sum using powers of 10 to show place value and explain your steps. 3) 620.83

**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?

**psychology**

Aversive conditioning-a type of counterconditioning that associates an unpleasant state with an unwanted behavior.

**statistics**

The weights of a group of adult males are normally distributed with a mean of 180lb and standard deviation of 8lb. Find the probability that a randomly chosen male from this group weighs more than 190lb.