# Posts by samantha

Total # Posts: 1,701

**math**

how to solve this need to change to equivalent divisio with a whole number 0.4/9.16

**physics**

calculate the uncertainty of the coefficient of friction. avg. ì=.574

**physics**

a car traveling 41.6 m/s is 190 m behind a truck traveling 19.4 m/s. how long will it take the car to reach the truck?

**physics**

at highway speeds, a particular automobile is capable of an acceleration of about 2.6 m/s^2. at this rate, how long does it take to accelerate from 60 km/h to 110 km/h?

**math**

The answers are: D B C A B A B C A

**math**

1 1/3

**geography**

do you think that the island of Santorini was in fact the legendary Atlantis Plato depicted? Support your view with evidence

**chemistry**

its -3.02

**Chemistry calorimeter.. please help!**

thank you!

**Chemistry calorimeter.. please help!**

A coffee cup calorimeter contains 100ml of .200M H2SO4 at 22.3 degrees Celsius. When 2.16g Mg is added, the temperature rises to 36.3 degrees Celsius. What is the heat of the reaction per mole Mg? Please help and show steps. Much appreciated :)

**Math**

Teresa had a family photo with the dimensions of 12 inches by 16 1/2 inches. What is the area of the photo in square inches? Please help!!! :(

**physics homework**

two tugboats pulled a disabled supertanker. each tug exerts a constant force of 1.80 x 10 degree N, one 14 degree west of north and the other 14 degree east of north, as they pull the tanker 0.75 km toward the north. what is the total work they do on the supertanker?

**physics homework**

You throw a 20 N rock into the air from ground level and observe that when it is 1 5.0 M high, it is traveling upward at 25.0 m/s. Use the work energy principle to find (a) the rock’s speed just as it left the ground and (b) the maximum height the rock will reach.

**physics**

A stone is thrown horizontally at 30.0 m/s from the top of a very tall cliff. (a) Calculate its horizontal position and vertical position at 2-s intervals for the first 10.0s. (b) Plot your positions from part (a) to scale. Then connect your points with a smooth curve to show ...

**english/history**

Explain how The Federalist Papers would have been more or less successful if newspapers had been printed monthly (rather than daily or weekly).

**Math**

Number Sense Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not. Tennis--2 players Basketball--5 players Softball--10 players

**Finance**

You (or your parents) plan to pay $1,275.00/month for a mortgage. How much is the minimum realized income per month to the nearest penny

**chemistry**

If you were asked to convert 25 cg to the unit hg, which of the following would be the first fraction used in the conversion?

**chemistry**

Which statement is the best example of pseudoscience? Mike joined a group that studies phrenology. C.J. joined a group that studies endangered species. Katarina joined a group that studies herbal remedies. Lee joined a group that studies stars and planets

**math**

find the unit rate of $122 in 8 days

**math**

the unit of $112 in 8 days

**Algebra II**

Simplify the expression in exponential notation. a*a*a I thought it was a^3 but that was wrong.

**Math**

Select all that justify the following statement. 2 * 1/2 = 1

**math,probability**

I just don't understand how to start it, I need structure , I can figure out the rest, don't know how to get into a strategy.

**math,probability**

Hi, I don't understand a homework question, can anyone please help me? I'm bad at probability. what is the probability that when you pick two cards, you will select at least one king out of two in a deck of six standard cards? (assuming there are no jokers)

**Chemistry**

How do I calculate the joules to heat 17 g of water from 22 degrees C to 78 degrees C?

**Math**

The ratio of the maximum speed of Car A to the maximum speed of Car B is 2:3. Explain whether Car A or Car B is faster.

**urgent i need help within an hour!**

Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 83.3 g of ascorbic acid dissolved in 210. g of water has a density of 1.23 g/mL at 55°C Calculate the molarity of ascorbic acid in this solution. i got 2.77 but its wrong

**chem**

a was incorrect

**chem**

Calculate the number of moles of solute present in each of the following solutions. a) 39.0 mg of an aqueous solution that is 1.00 m NaCl b)90.0 g of an aqueous solution that is 2.10% sucrose (C12H22O11) by mass.

**Math**

John bought some stamps. He used 3/5 of then to mail letters. He had 12 stamps left. How many stamps did he use?

**Percents Using Proportions**

Thank you! I will reverse my work now. This was extremely helpful for grasping a new concept.

**Percents Using Proportions**

Here is my (probably incorrect) work so far: 1) n/160 = 125/100 40 160x125=4000 ________ 100 | 4000 Was I suppose to divide it or not? I'm not sure. 2) 714/1295 = n/100 _________ 714/1295=102/185 185 | 10,200 102x100=10,200

**Percents Using Proportions**

I do not understand the wording and/or got stuck while I was working on the following two problems: The attendance at a family reunion was 160 people. This was 125% of last year's attendance. How many people attended the reunion last year? There are 1,295 students ...

**science-repost! please help**

Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this

**science**

The enthalpy of solution of KBr in water is about +198 kJ/mol. Nevertheless, the solubility of KBr in water is relatively high. Why does the solution process occur even though it is endothermic

**chem**

Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this

**CJ 216**

I would like to mention, really rude answers.

**CJ 216**

I know its confusing because they don't really tell what Uncle Bob has done. I am finding the same difficulty. This website was of no help.

**chem-**

Draw the structures of the two monomers that yield Nomex®. can someone show me?

**Pre-Algebra**

Simplify the expression. Write the result using positive exponents only. (-2x^3y^-4)(5x^-1y)

**chem**

760 torr is wrong

**chem**

A liquid that has an equilibrium vapor pressure of 129 torr at 25°C is placed into a 1-L vessel like that shown below. A few mL of the liquid is introduced into the vessel at 25°C while it has a pressure of 1.00 atm of air in it, without allowing any of the air to ...

**Chemistry**

convert grams to moles then use the equatino to do moles of Na to moles of H2O then convert moles of H2O to molecules by using avogadros number (6.022e23) I believe

**chem-answer check please**

Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...

**chemistry**

Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...

**chem**

thanks! also what does a compound have to have to have dipole-dipole and also dispersion forces Identify the type or types of intermolecular forces present in each substance. hydrogen peroxide, HOOH i put dispersion forces and hydrogen bonding. but its wrong. is it also dipole...

**chem**

and would the same be for CH3CH2CH2Cl or CH3CH2Cl where the first one has more df?

**chem**

so chain 1 has more dispersion force?

**chem**

Which member in each pair has the stronger intermolecular dispersion forces? CH3CH2CH2I or CH3CH2I or neither? how do you know this

**chem please help!**

thanks bobpursley. drbob222 you answered the first part but i also needed helpp on the second

**chem please help!**

Krypton gas is four times denser than neon gas at the same temperature and pressure. Which gas is predicted to effuse faster? i got neon which is correct but How much faster? how many times? i don't know how to get htis

**math**

what is the next two numbers in the pattern 75,74,72,69,65,...

**chem**

thanks how do i know how much faster?

**chem**

Krypton gas is four times denser than neon gas at the same temperature and pressure. Which gas is predicted to effuse faster?

**chem**

its suppose to be a ratio

**chem**

You have two flasks of equal volume. Flask A contains H2 at 0°C and 1 atm pressure. Flask B contains CO2 gas at 0°C and 2 atm pressure. Compare these two gases with respect to each of the following mass of gas (Flask A:Flask B)

**plzz HELP me**

Hey stop being mean!!!!! It's true she suppose to help, not to give answers. Also she is not going to be there when you take the real test.... What if you're youre teacher asks you questions about this.... Learn little guy..

**Math**

oh, it's c

**Math**

A car salesman receives $575 a week in addition to 3% commission on all cars whose sticker price is above $4,500. One week he sold a Ford for $8,785 and a Buik for $5,832. How much did he earn that week? A. $749.96 B. $838.55 C. $1013.51 D. $4,385.10 Explain how you got your ...

**english langage arts**

@Writeacher, I don't get why your so 'furious,' all the time or is that your way of showing off. If you can go a day of helping someone without criticizing them, the person will actually want to thank you. And the story is "Fire Pond."

**Geometry**

Two cylinders have the same volume. If the radius of cylinder I is 3 times the radius of cylinder II, then the height of cylinder II is how many times the height of cylinder I? A. 12 B. 9 C. 6 D. 3 Please explain how, if possible.

**Math**

In the town of Niceville, a local lottery is held once a year for the residents. Lottery tickets cost 50 cents apiece. Each lottery ticket contains four numbers, from 1 to 20. The lottery machine will select six numbers from 1 to 20. A winning ticket, worth $100, will contain ...

**Algaebra**

Two functions f and g are defined by f:x = 25 /(3x-2) g:x = x^2 Find the composite function Please show all calculations, thank you!

**Algaebra**

Two functions f and g are defined by f:x = x^2 + 3 g:x = 2x+1 Find the function fg Please help and show all working out,i got the answer for it but i really don't understand it!!! Thank You

**Complex Algaebra, Plz Help!!**

Could you ellaborate further on how you got your answer for b please Damon. The composite function fg thank you

**Complex Algaebra, Plz Help!!**

Sorry i wrote c wrong its the solution of equation fg(x)=2/(x-1) really sorry, had less sleep last night

**Complex Algaebra, Plz Help!!**

If we can assume it means = I think that is right

**Complex Algaebra, Plz Help!!**

Good evening to all around the world. Need help with this question, however i must show my answers supported by the working out. Please help. This question is difficult, the one who solves it for me is my hero!!!! Q11) Two functions f and g are defined by F:x (arrow) 25/(3x-2...

**Please..**

what would happen to the respiratory system if it didn't have the nose, pharynx, larynx, trachea, bronchi, lungs, and mucus? I know what would happen to the human body but what would happen specifically to the respiratory system? Thank you!

**Biology**

what would happen to the respiratory system if it didn't have the nose, pharynx, larynx, trachea, bronchi, lungs, and mucus? I know what would happen to the human body but what would happen specifically to the respiratory system? Thank you.

**science**

Both Jim and his mother have a widow's peak but his father doesn't. Jim marries Lisa, who doesn't have a widow's peak. What is the probability that their children will have widow's peak?

**science**

A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the figure below. When 0.46 kJ of heat is added to the gas, it expands and does 186 J of work on the surroundings. What are the values of ÄH and ÄE for this process?

**science**

An experiment calls for you to use 100. mL of 0.91 M HNO3 solution. All you have available is a bottle of 5.00 M HNO3. How would you prepare the desired solution

**science**

(c) The kinetic energy of the emitted electrons is measured to be 15.2 eV. What is the first ionization energy of Hg in kJ/mol?

**science**

thanks!!!

**science**

Calculate the density of sulfur hexafluoride gas at 703 torr and 23°C. density is mass/volume so how do i get those from what i am given? also ) Calculate the molar mass of a vapor that has a density of 6.735 g/L at 11°C and 743 torr.

**science**

Calculate the number of molecules in a deep breath of air whose volume is 2.68 L at body temperature, 37°C, and a pressure of 743 torr (b) The adult blue whale has a lung capacity of 5.0 103 L. Calculate the mass of air (assume an average molar mass 28.98 g/mol) contained ...

**science**

thanks! for b i used that equation and got the volume to be .400 buts its wrong. do i use the presure from a or do i just use 1atm?

**science**

that was my answer for letter a and i did all of those conversions first and i still got that anwerrs which is wrong. can you do the problem and tell me what you get?

**science**

i got 1.28 but its wrong

**science**

how do i ansewr this question? An aerosol spray can with a volume of 400. mL contains 2.25 g of propane gas (C3H8) as a propellant (a) If the can is at 31°C, what is the pressure in the can? (b) What volume would the propane occupy at STP? (c) The can's label says that...

**science**

A fixed quantity of gas at 22°C exhibits a pressure of 739 torr and occupies a volume of 5.46 (a) Calculate the volume the gas will occupy if the pressure is increased to 1.74 atm while the temperature is held constant.

**geometry**

find the measures bc and ac

**People**

who is a famous person who didn't go to college or didn't graduate high school and is in bad shape because of it. (aka is poor or cant get a job or turned into a criminal etc)

**ece**

1.wich of the following dramatic play behaviors are most typical for a 2-year old child? a.uses realistic props,and repeats routines over and over. b.prefers exciting and danger-packed themesfor play. c.plays in groups of one gender, with lots of dialogue. d.prefers rigid ...

**math**

28 weeks

**chemistry**

what is the concentration of the hydroxide ion in a solution if .12 mol of strontium hydroxide are dissolved in water and the final solution volume is 500. mL?

**debate**

does that mean that companies that supply arms and stuff are the reason why we would go through war/ i dotn understand...honestly i don't understand capitalism at all..:(

**debate**

why would a capitalist society, in general, cause war?

**chemistry**

(a) Construct a Lewis structure for O2 in which each atom achieves an octet of electrons. (Assign lone pairs where appropriate.) i am using marvin sketch and don't know what i need to show

**chem**

Which ionic compound is expected to form from combining the following pairs of elements? yttrium and oxygen i put YO but its wrong

**biology**

why would a One serving of particular food that contains 16 g of carbohydrates, 2 g of proteins, and 10 g of fats hav 300 calories?

**math**

the ratio of the number of men to the number of woman working at tommys pub is 7:2.altogather there are 360 workers at the company. how many of the workers are woman.

**chem**

Arrange the following oxides in order of increasing acidity: P2O5, As2O5, N2O5, SnO2, SeO3, and BaO. (Use the appropriate <, =, or > symbol to separate substances in the list.)

**Physics. Easy question? Please help**

What is the (a) maximum and (b) minimum total resistance value that can be obtained using three resistors whose values are 2.0 ohms, 4.0ohms and 6.0 ohms? The resistors can be used individually, in pairs, or all three at once. Is this a trick question? Is the answer 12 and 2?

**chemistry**

i got BaO < SnO_2 < N_2O_5 < P_2O_5 < As_2O_5 < SeO_3 but its wrong

**chemistry**

Arrange the following oxides in order of increasing acidity: P2O5, As2O5, N2O5, SnO2, SeO3, and BaO. (Use the appropriate <, =, or > symbol to separate substances in the list.) I have no idea how to do this! please help!

**chemistry**

how does aluminum's position on the periodic table relate to its properties? i mean like how does it effect it's properties? thank you

**math**

ok thank you!!