Sunday

April 20, 2014

April 20, 2014

Total # Posts: 787

**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 th...

**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 i...

**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 a...

**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 d...

**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

**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 101...

**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 janito...

**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

**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?

**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.

**math**

Imagine that I am hiring you to work for me for the next month (30 days). Would you rather have $10,000 in a single payment on the 30th day? Or would you rather be paid by the following schedule: on the first day, $0.01; on the second day, $0.02; on the third day, $0.04; on th...

**Finance for Buisness**

The target capital structure for QM Industries is 42% common stock, 12% preferred stock, and 46% debt. IF the cost of common equity for the firm is 18.9%, the cost of preferred stock is 9.2%, the before-tax cost of debt is 8.4%, and the firm's tax rate is 35%, what is QM&#...

**economics**

You are hired as the consultant to a monopolistically competitive firm. The firm reports the following information about its price, marginal cost, and average total cost. Can the firm possibly be maximizing profit? If not, what should it do to inc...

**economics**

Give two examples of price discrimination. In each case, explain why the monopolist chooses to follow this business strategy.

**math**

[(14+7) / 3] + 10 x (6-3)

**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? (Round to the nea...

**american literature**

identify two rhetorical devices Lincold used in his "Gettysburg Address" - Include examples from the speech of each device

**physics- please help !**

this is 13

**soc 120**

Give an example of something that one culture might regard as a virtue that another culture might not. Explain why this could lead to relativism.

**Chemistry**

Determine the identity of an unknown solution that formed a yellow precipitate with solution 1, No Reaction with solution 2, No Reaction with solution 3, and a canary yellow solution with solution 4?

**Chemistry**

Complete each ionic equation Cu+2 + SO4-2 + 4H2O ---->

**Chemistry**

Complete each ionic equation Cu+2 + SO4-2 + 4H2O ----> Ca+2 +2NO3-1 + 4H2O ----> 3K+1 +PO4-3 + 6H2O ----> Na+1 + Br-1 + 2H2O ----> 2Na+1 + S-2 + 2H2O -----> 2NH4+1 + CO3-3 + H2O ----> 2Na+1 + Cr-2 + 2H2O -----> Mg+2 + 2Br-1 + 4H2O -----> Na+1 + Cl-1 + 2...

**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?

**Chemistry**

If 0.150 moles of salicylic acid and execs acetic anhydride are used during a synthesis of aspirin, how many grams of aspirin will be obtained if the reaction gives a 38% yield?

**Chemistry**

The uranium used for nuclear fuel exists in nature in several minerals. Calculate how many moles of uranium are in 6.0 moles of the following: Carnotite; K2(UO2)2(VO4)2*3H2O Uranophane; CaU2Si2O11*7H2O Autunite; Ca (UO2)2(PO4)2*10H2O

**economics**

In 1989, the Detroit Free Press and Detroit Daily News (the only daily newspapers in the city) obtained permission to merge under a special exemption from the antitrust laws. The merged firm continued to publish the two newspapers but was operated as a single entity. a. Before...

**Statistics**

Determine if a linear relationship exists between unemployment rates and cost of living indexes by constructing a scatter chart and adding a trend line. What is the regression model and R2?

**chemistry **

In the chemistry exp molar mass of a volatile liquid what will be the outcome if the hole in the aluminu foil was larger would it make the molar mass high or low. Or what will happen if yhr water vapors condensed under the aluminum foil before the final weighing

**chemistry **

A volatile liquid was allowed to evaporate in a 43.298g flask that has a total volume of 253 mL. The temp of the water bath wad 100 °C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vaporous was 44.173g. Calculate the molar mass of the liquid

**Chemistry**

Titanium (6.94x10^-19) and silicon (7.77x10^-19) surfaces as irradiated with UV radiation with a wavelength of 231 nm. what is the wavelength of the electrons emitted by the titration surface?

**calculus**

Suppose lighthouse A is located at the origin and lighthouse B is located at coordinates (0,6). The captain of a ship has determined that the ship's distance from lighthouse A is 2 and its distance from lighthouse B is 5. What are the possible coordinates for the ship?

**Chemistry**

What is the frequency of the photons emitted by hydrogen atoms when they undergo transition from n=5 to n=3?

**Math**

An unfair coin with Pr[H]=0.25 is flipped 95 times. A random variable X is defined as the number of heads that occur. Find the standard deviation. Any help??

**math**

if you have 6/24 and 18/72 and 3/12 it all reduces to 1/4

**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

**Physics**

How much heat must be added to 30 g of water at an initial temperature of 62°C to completely convert the 100°C water to steam?

**Chemistry**

What about the iron (II) oxide? and the KOH?

**Chemistry**

I will do an experiment that includes 4 grams of aluminum hydroxide and iron (III) oxide mixture, where 75% of it is Al(OH)3, and 15 ml of water and 25 ml of 2M KOH will be added and then boiled so that the Al(OH)3 dissolves. It will be filtered and then sulfuric acid will be ...

**calculus**

4. A particle starts at the point (5, 0) at t = 0 and moves along the x-axis in such a way that at time t > 0 the velocity is given by v(t)=t/(1+t^2) a. Determine the maximum velocity attained by the particle. Justify your answer. b. Determine the position of the particle a...

**calculus**

1. A conical reservoir has a depth of 24 feet and a circular top of radius 12 feet. It is being filled so that the depth of water is increasing at a constant rate of 4 feet per hour. Determine the rate in cubic feet per hour at which water is entering the reservoir when the de...

**Understanding psychology eighth edition**

verbal skills and muscular coordination have been observed to impruove women when

**Spanish-SRAJMcGin please check**

Could Sra JMcGin please check my answers to these questions if she has time? Thank you

**Spanish-3rd question**

I know what it means in English-I was wondering if it was correct in Spanish.

**Spanish-3rd question**

Thank you again for checking these-I couldn't number them or put question marks in front because jishka wouldn't accept them

**Spanish-3rd question**

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

**Spanish-2nd answer**

I was wondering if they were correct in Spanish-I know what they mean in Englsih-I wrote the answers.

**Spanish-2nd answer**

¿Qué hace los actores en la ópera de teatro? Los actores juegan unos papeles en la obra de teatro. ¿Qué pasa hacer la semana próxima? Voy a la escuela la semana próxima ¿Qué hiciste la semana pasada? Hice mi tarea ...

**Spanish**

I have to post the questions separately with my answers or they won't accept them-I'm really sorry it keeps saying URL so I will have multiple listings Thank you for checking

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