Wednesday

March 4, 2015

March 4, 2015

Number of results: 61,314

**chemistry**

A student is performing an experiment to find the density of water. She obtains a 100ml beaker, which weighs 53.257 grams, and she fills it with 60 mL of water. The temperature of the water is 25.5 degrees celsius (room temperature). Again the student takes the weight of the ...
*February 16, 2015 by Samantha*

**Math**

A driver uses about 600 gallons of gas a year to get around his car. For how many years could he drive his car on all the gasoline that is being lost in one day as a result of this spill.. In one day 2,000,000 gallons spilled.
*February 6, 2013 by Sarah*

**math/help**

A driver uses about 600 gallons of gas a year to get around his car. For how many years could he drive his car on all the gasoline that is being lost in one day as a result of this spill.. In one day 2,000,000 gallons spilled.
*February 6, 2013 by Nalini*

**Physics**

The volume of a 100 cu ft air tank at 45 psig is put in a 30 cu ft air tank. What is the gauge pressure in the 30 cu ft air tank?
*February 3, 2013 by Mustic Dicko*

**physics**

The volume of a 100 cu ft air tank at 45 psig is put in a 30 cu ft air tank. What is the gauge pressure in the 30 cu ft air tank?
*February 3, 2013 by Mustic*

**Physics, help please!!!**

A tank is fillwed with 0.7m of water, a hole at the bottum of the tank with a radius of 0.001m is opened. At the same time, water is added to the tank at the same rate as it exits, calculate the speed at which water flows out from the hole. I am using P=Po+pgh which gives me ...
*March 18, 2010 by Dave*

**chemistry**

if i mix 4 grams of hydrogen and 32 grams of oxygen how many grams of water would be produced
*May 24, 2010 by kee*

**physics**

A water tank is filled to a depth of 10 m and the tank is 20 m above ground. The water pressure at ground level in a hose 2 cm in diameter is closest to: A) 3.9 × 105 N/m2 B) 2.0 × 104 N/m2 C) 9.2 N/m2 D) The cross-sectional area of the tank is needed.
*March 30, 2014 by Georgey*

**algebra**

You are standing 14 feet from the edge of a cylindrical water tank and 26 feet from a point of tangency. The tank is 10 feet tall. What is the volume of the tank in cubic feet?
*March 13, 2011 by Sarah*

**Chemistry**

If 80.0 grams of methane were reacted with 368 grams of oxygen, how many grams of water would be formed (find limiter first).
*April 3, 2011 by Lisa*

**MACROECONOMICS**

Which of the problems in the construction of the CPI might be illustrated by each of the following situations? Explain. a. the invention of the Sony Walkman b. the introduction of air bags in cars c. increased personal computer purchases in response to a decline in their price...
*April 12, 2009 by SARA*

**physical science**

The density of copper is 8.92 g/cm cubed. if you plotted the mass of copper in grams verses the volume in cubic cm what would the slop of the line be?.
*January 24, 2011 by misti*

**chem**

gold hasa density of 19 g/cm^3 if an 18 inch necklace is made of pure gold how much would it weigh in grams if it is 1 cm wide and 1 mm thick
*March 16, 2011 by hillary*

**chemistry**

Ethanol has a density of 0.780 g/mL. What volume would 500. grams of ethanol occupy. Answer with correct number of sig figs
*January 31, 2012 by kr*

**Science**

Ethanol (grain alcohol) has a density of 0.789 grams per centimeter cubed, How many cubic centimeters of ethanol must be poured into a graduated cylinder to equal 30.3 grams?
*January 10, 2012 by Cedquandra*

**Math**

The price of gas is 85.9 cents per Litre. If Brenda needs 48.3 L of gas to fill her gas tank, how much will she pay? Please show the steps.
*April 15, 2014 by Anna*

**chemistry(Please Check)**

You have a 4.0 L steel tank containing hydrogen gas. You are able to heat or cool the tank, and measure the pressure of the gas. At what temperature, in Celsius, would you read a pressure of 4.5 atm ? 298
*April 23, 2012 by Wurola*

**physics**

A meter stick lies on the bottom of a 100 cm long tank with its zero mark against the left edge. You look into the tank at an angle of θ = 24°, with your line of sight just grazing the upper left edge of the tank, and h = 32 cm. (a) What mark do you see on the meter stick...
*September 10, 2011 by crystal*

**Physics**

Suppose you have a perfectly spherical water tank with an inside diameter of 8.6 metres. If the drain at the bottom of the tank can't handle a hydrostatic pressure of more than 50 kilopascals, what is the maximum volume of water, in litres, that can be contained in the tank? ...
*April 16, 2008 by Anna*

**Physics**

Suppose you have a perfectly spherical water tank with an inside diameter of 8.6 metres. If the drain at the bottom of the tank can't handle a hydrostatic pressure of more than 50 kilopascals, what is the maximum volume of water, in litres, that can be contained in the tank? ...
*April 16, 2008 by zahra*

**math**

compounded- what would be the amount of compound interest on $12,000 invested for one year at 6%, compounded quarterly? round your answer to the nearest tenth. could you show me the work please ? i had $737.00 is that answer correct?
*November 13, 2012 by linda*

**physics**

A primitive diving bell consists of a cylindrical tank with one end open and one end closed. The tank is lowered into a freshwater lake, open end downward. Water rises into the tank, compressing the trapped air, whose temperature remains constant during the descent. The tank ...
*November 19, 2008 by kb*

**business law**

Ron supervises delivery of flowers for a wholesale distributor of fresh flowers, Flowers. Inc. In order to accommodate one of the company’s best customers, Ron offers to immediately rush a delivery of fresh peonies. All of the delivery trucks are currently out on delivery. Ron...
*February 4, 2012 by sarena*

**college physics**

small one-cylinder gasoline engines sometimes use a device called a magneto to supply current to the spark plug. A permanent magnet is attached to the flywheel, and a stationary coil is mounted adjacent to it. Explain how this device is able to generate current. What ha[[ens ...
*March 8, 2013 by Anonymous*

**physical science**

The density of copper is 8.92 g/cm (cubed). If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?
*September 1, 2010 by Madi*

**Science**

The density of copper is 8.92 g/cm to the third power. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be
*September 23, 2010 by TJ*

**chemical calculations**

Brine from a first tank runs into a second tank at 2 gallons per minute and brine from the second tank runs into the first at 1 gallon per minute.Initially,there are 10 gallons of brine containing 20 lb of salt in the first tank and 10 gallons of fresh water in the second tank...
*November 6, 2014 by jj*

**Chemistry**

A mettallurgist decided to make a special alloy. He melted 30 grams of Au(Gold) with 30 grams of Pb. This melting process resulted to 42 grams of an Au-Pb alloy and some leftover Pb. This scientist wanted to make 420 grams of this alloy with no leftovers of any reactants. how ...
*October 31, 2011 by Eli*

**Chemistry**

For the equation below, if 58.6 grams of Al were to react with 540 grams of H2SO4, how many grams of H2 would be produced? 2Al+3H2SO4--->1Al2(SO4)3+3H2
*February 2, 2011 by Eva*

**chemistry**

Solid sodium azide (NaN3) is used in air bags to fill them quickly upon impact. The solid NaN3 undergoes a decomposition reaction to produce Na(s) and N2(g). a. Provide the balanced equation for the decomposition of NaN3. b. What mass, in grams, of NaN3 is needed to fill the ...
*November 6, 2013 by Anonymous*

**physics**

The pressure gauge on a tank registers the gauge pressure, which is the difference between the interior pressure and exterior pressure. When the tank is full of oxygen (O2), it contains 10.0 kg of the gas at a gauge pressure of 43.0 atm. Determine the mass of oxygen that has ...
*December 13, 2014 by shawn*

**Soil Chemistry**

Gasoline producers add oxygenated chemical compounds to reduce the amount of carbon monoxide produced when the fuel is burned. Methyl t-butyl ether (MTBE) is one such oxygenate that is no longer used because of health and environmental concerns. what are the correct exponents ...
*July 5, 2014 by John*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 9, 2013 by dmkp*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 9, 2013 by dmkp*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 10, 2013 by dmkp*

**Science**

Your family is going to have a contractor build a pool in your backyard. Your mom wants to make this a learning experience, so she asks you to find the mass of the water that will fill the pool. She has told you that the pool holds 75,700 L of water, and you know that the ...
*September 26, 2014 by Angela *

**Math**

The price of a gallon of gasoline increased by 5 cents one week, decreased by 3 cents each of the next two weeks, and increased by 9 cents the fourth week. Find the average change in the price of gasolina for the 4 weeks.
*December 9, 2014 by Alice*

**Chemistry**

The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of 1.276X10^7 METERS. from these data calculate the average density of the earth(g/cm^3) could the earth be made mostly of water (density=1.00g/cm^3), abundant...
*August 30, 2011 by ALISON*

**Calculus 2 / Physics**

An underground tank full of water has the following shape 1) hemisphere of radius 5 m at the bottom 2) a cylinder of radius 5 m and height 10 m in the middle 3) a circular cone with base radius 5 and height 4 m at the top The top of the tan is 2 m below the ground surface and ...
*November 17, 2010 by John*

**calculus 2 or physics**

An underground tank full of water has the following shape 1) hemisphere of radius 5 m at the bottom 2) a cylinder of radius 5 m and height 10 m in the middle 3) a circular cone with base radius 5 and height 4 m at the top The top of the tan is 2 m below the ground surface and ...
*November 17, 2010 by John*

**PLZ ANSWER CHEM QUESTION**

a chemist reacted 64 grams of Ru with O2. This reaction produced 160 grams of ruthenium oxide and 4 grams of leftover O2. How much of the reactants would this scientist need to make 320 grams of the product with no leftover O2? Ru + O2 = RuO2 + O2 leftover
*November 3, 2011 by Griffinson*

**environmental engineering**

A water treatment plant has 6 settling tanks that operate in parallel (the flow gets split into six equal flow streams), and each tank has a volume of 600m3. If the flow to the plant is 10 mgd, what is the retention time in each of the settling tanks? If, instead, the tanks ...
*July 10, 2014 by =)*

**Math**

How would you go about solving this problem? A 2000 L tank containing 550 L of water is being filled with water at the rate of 75 L per minute from a full 1600 L tank. How long will it be before the two tanks have the same amount of water?
*October 12, 2008 by Megan*

**mechanical properties of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 9, 2013 by dmkp*

**physics**

If you have a tank of 51ft long by 4.7ft wide, and need to fill it to the two inch mark with hydrochloric acid, how many pounds are you putting in it? (Hint 1 gallon of acid weights 9.8 lbs.
*April 27, 2010 by Nancy*

**Math**

If you have a tank of 51ft long by 4.7ft wide, and need to fill it to the two inch mark with hydrochloric acid, how many pounds are you putting in it? (Hint 1 gallon of acid weights 9.8 lbs.
*April 27, 2010 by Nancy*

**chemistry**

Ethanol, C2H5OH, is being promoted as a clean fuel and is used as an additive in many gasoline mixtures. Calculate the ΔH°rxn for the combustion of ethanol. ΔH°f [C2H5OH(l)] = -277.7 kJ/mol; ΔH°f [CO2(g)] = -393.5 kJ/mol; ΔH°f [H2O(g)] = -241.8 kJ/mol
*March 10, 2013 by Anonymous*

**Chemistry**

For the balanced equation shown below, if 40.1 grams of C2H3O2Br were reacted with 8.01 grams of O2, how many grams of H2O would be produced? 2C2H3O2Br+O2->4CO+2H2O+2HBr Thank you!
*March 3, 2011 by Lelu*

**Chemistry**

For the balanced equation shown below, if 40.1 grams of C2H3O2Br were reacted with 8.01 grams of O2, how many grams of H2O would be produced? 2C2H3O2Br+O2->4CO+2H2O+2HBr Thank you!
*March 3, 2011 by Lelu*

**Algebra**

A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture? My problem is that I can't figure out ...
*February 16, 2007 by peggy*

**algebra**

A certain toilet tank can be emptied in 6 sec through its drain when it is flushed. This happens at the same time that the water is flowing in through the inlet pipe. Withthe drain closed, the inlet pipe canfill the tank in 30 sec. How long would it take to drain the tank if ...
*February 12, 2012 by carolyn*

**Algebra**

I need help with this like really badly sooo yeahhhh:) here it is: Hugo withdrew some money from his bank account. He spent one third of the money for gasoline. Then he spent half of what was left for a haircut. He bought lunch for $6.55. When he got home,he had $13.45 left. ...
*August 22, 2012 by Emily*

**chemistry**

How much ice at zero degrees Celcius (in grams) would have to melt to lower the temperature of 351 of water from 25 to 5? (Assume the density of water is 1.0 .)
*January 27, 2010 by Anonymous*

**HEEEEEEELP**

HI I have no idea what's Alternative energy source . Can anyone help me in giving me a defintion for it thanx An alternative energy source is an additional one that is not being used already. It depends on what source is predominant or currently being used. In cars, gasoline ...
*December 28, 2006 by Anonymous*

**physics**

extrapolation is the process whereby we extend an established numerical relationship between two variables beyong the elastic limit, why extrapolation would not be usedful in this particular situation? What "particular situation" are you talking about? Inelastic distortion ...
*October 25, 2006 by Katrina*

**geometry**

An open rectangular glass tank with a horizontal base PQRS measures 80 cm by 50 cm by 34 cm. 110 liters of water is poured into the tank. v The tank is tilted towards edge PQ until the water just reaches the edge TU. w Calculate the value of d. s
*June 19, 2012 by pamela*

**Calc**

A cylindrical slime tank is placed so that the axis of the cylinder is horizontal. Find the fluid force on a circular end of the tank if the tank is half full, assuming that the diameter is 6 feet and the slime weighs 54 pounds per cubic feet?
*December 14, 2013 by Ethan*

**construction**

A swimming pool is 120' long,45' wide and 10' deep.How long would it take to fill with water if your maximum fill rate was 15 gallons per minute?
*July 26, 2011 by Mark*

**Chemistrt**

How many grams in 4.00 moles of Fe2O3? Answer 4 Moles Mass = 159.7 grams 4 X 159.7/1 = 6.388 or 6.39 grams. How do you get 6.39X102grams? Fe is +2 and O is –2. you have 2-Fe and 3-O why would this not be 6.39X10-2 grams
*December 6, 2009 by Paul*

**math-DUE TONIGHT PLEASE HELP**

A shoe store carries one brand of shoe in 3 styles, 5 sizes, and 4 colors. How many different shoes are available for this one brand?
*April 12, 2010 by KiKi*

**Math**

1) Last year, Harjap spent a total of $11,348 on gasoline, oil, repairs and maintenance, and insurance. His travel log shows that he drove 14,488 km on business and 8329 km on personal use. What vehicle expense can Harjap report for the year? 2)Mr. Bartlett's will specified ...
*May 3, 2014 by Amy*

**to dr bob..chemistry**

bottle of wine contains 13.1% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/cm3. Calculate the concentration of ethanol in wine in terms of mass percent and molality. mass percent _______% molality ______mol/kg Thanks Responses AP CHEMMMM - DrBob222, Saturday...
*November 30, 2008 by Lawrence*

**math help**

Brand x cost $1.56 for 12 ounce. Brand y cost 2¢ more per ounce. What is the cost of 15 ounce of Brand y
*January 28, 2013 by Anonymous*

**math**

A tank was 3/5 filled with water. After removing 120 litres of water from the tank it was 1/5 filled. a)Find the amount of water the tank can hold when completely filed. b)If one litre of water has a mass of 1 kg, find the mass of water in the tank when filled.
*February 13, 2013 by sherika*

**Math**

A tank contains a certain amount of water. Each month half of the water in the tank evaporates and an extra liter of water is added. After 5 months, after the litres of water is added, there were 4 litres of water in the tank. How many litres were in the tank originally?
*September 1, 2014 by Anonymous*

**chem**

a 13.5L tank is filled with H2 to a pressure of 2x10^2atm. How many balloons (each 2L) can be inflated to a pressure of 1 atm from teh tank?assume there is no temp change and tank cant be emptied below 1 atm of pressure
*November 16, 2007 by mel*

**calculus**

Water is being filled into a water tank at 22 liters/second. The base of the tank has dimensions w = 1 meter and L = 2 meter . What is the rate of change of the height of water in the tank? (express your answer in cm/sec).
*November 9, 2012 by kchik*

**calculus**

Water is being filled into a water tank at 22 liters/second. The base of the tank has dimensions w = 1 meter and L = 2 meter . What is the rate of change of the height of water in the tank? (express your answer in cm/sec).
*November 9, 2012 by kchik*

**buisness**

I need help in a project on 'case study on soft drinks' of about 30 pages . Please provide some websites details which can help me. It should include information abou history,nature of soft drinks, process of manufacturing and a casestudy on a particular softdrink brand
*December 15, 2013 by rahul*

**ap chemistry**

What pressure would a mixture of 3.2 grams of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 5.1 liter container at 127C? Answer in units of atm
*February 9, 2013 by cheri*

**Process Technology **

How many minutes will it take for an oil well producing 350 barrels of oil per day to fill a 14 foot diameter by 49 foot tall tank?
*January 7, 2012 by Cori*

**maths**

A rain water tank is half full. After it rained the tank if four fifths full. - Find the amount of water collected as a fraction of a full tank.
*February 17, 2008 by cindy*

**physics**

A mortar fires a projectile at an angle of of 30 degrees above the horizontal with a velocity of 500 m/s. A soldier spots a tank to be travelling in the direction of the mortar at a constant the rate of 4 m/s. How far should the tank be from the mortar before the mortar is ...
*September 16, 2014 by Strom*

**physics**

A fully loaded 737 aircraft takes off at 250 {\rm km/h}.
*September 21, 2010 by Anonymous*

**math**

can anyone please help me with this problem. thanks Each week, Florida Citrus, Inc., uses a single machine for 150 hours to distill orange and grapefruit juice into concentrates that are then stored in two seperate 1000-gallon tanks before being frozen. (One tank is for orange...
*July 5, 2007 by Kevin*

**statistics**

The average gasoline price of one of the major oil companies has been $3.20 per gallon. Because of cost reduction measures, it is believed that there has been a significant reduction in the average price. In order to test this belief, we randomly selected a sample of 36 of the...
*November 12, 2013 by Alex*

**chemistry phyics HELP PLEASE STUCK**

A 20.0 L tank contains helium at a pressure of 100 atm and a temperature of 30 degrees Celsius. A) what is the mass of the helium inside the tank?(HINT: the molar mas of He is 4.0 g/mol B) what would the mass of nitrogen (N2) be under the same conditions?
*October 27, 2014 by nikkie*

**Chemistry**

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 50. cm3. If the combustion of this mixture releases 990. J of energy, to what volume will the gases expand against a constant pressure of 645 torr if all the energy of combustion ...
*October 13, 2011 by Sam*

**chemistry**

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 70. cm3. If the combustion of this mixture releases 885 J of energy, to what volume will the gases expand against a constant pressure of 645 torr if all the energy of combustion is...
*October 22, 2012 by Brandon*

**Chemistry**

1.50 liters tank filled with helium at 125 atm is used to fill balloons. The pressure in each balloon is 950 torr and the volume of each is 1.20 liters. How many ballons can be filled?
*September 8, 2010 by Alex Yoo*

**Algebra**

suppose you are at the gas station filing your tank with gas. the function C(g) represents the cost C of filling up the gas tank with g gallons give the equation: C(g)=3.03(g) A)what does the number 3.03 represent? B)find C(2) C)find C (9) D) for the average motorist, name one...
*July 18, 2009 by Patty G*

**Math - Calculus**

Im doing some practice questions and im stumped on this one. The amount of cleaning fluid in a partially filled, spherical tank is given by V = (pi)R(h^2)-(pi(h^3))/3 Where R is the radius of the rank, and h is the depth of the center of the tank. If cleaning fluid is being ...
*December 3, 2006 by Swk13*

**thermodynamics**

if a pump discharges 75 gpm of water whose specific weight is 61.5 lb/ft^3(g=31.95fps^2). find a) the mass flow rate in lb/min, and b) and total time required to fill a vertical cylinder tank 10ft in diameter and 12ft high.
*December 8, 2012 by 18ms*

**phys1**

A 528 kg automobile is moving at 20.4 m/s at a height of 5.0 m above the bottom of a hill when it runs out of gasoline. The car coasts down the hill and then continues coasting up the other side until it comes to rest. Ignoring frictional forces and air resistance, what is the...
*February 26, 2012 by opp*

**AP Chemistry**

What pressure would a mixture of 3.2 grams of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 4.1 liter container at 127 degrees C? Answer in units of atm
*February 16, 2014 by Gabriella*

**Physics**

An 80 kg man is put into a tank of water. When completely submerged he displaces 75 L of water. If fatty body tissue has an average density of 0.9 kg/L and non-fatty body tissue has an average density of 1.1 kg/L, what percentage of the man is composed of fat?
*May 28, 2014 by Teagan*

**Calculus**

The tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank. The tank shown is a hemisphere with r = 5 ft. The water is to be pumped out at the top. First I solved for ri, ri / (5 - xi) = 5 / 5 ri = 5 - xi Vi...
*June 22, 2007 by COFFEE*

**chemistry**

How many grams of methane gas were used to fill a baloon to a volume of 3.0 L at STP?
*December 5, 2010 by Naples*

**chemistry**

Problem#9: Consider the fuel octane (the main component of gasoline) and its combustion reaction 2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(l) ΔHo = -10,942 kJ The “fuel value” of a fuel (unit kJ/g) is defined as the energy released when 1 g of the fuel undergoes ...
*October 21, 2010 by Sarah*

**Algebra**

Two hoses are connected to a swimming pool. Working together, they can fill the pool in 4 hr. The larger hose, working alone, can fill the pool in 6 hr less time than the smaller one. How long would it take the smaller one, woking alone, to fill the pool? Please explain
*November 4, 2011 by Megan*

**Physical Science**

Suppose an all good crown has mass m=3800 grams. Gold has a density of 19 grams/ cm^3. What is the volume of water displaced by a gold crown (in cm^3)? Please help :)
*September 17, 2014 by Belle*

**Chemistry**

Question: What mass of water, in grams, would have to be decomposed to produce 17.6 L of molecular oxygen at STP? Work: n=PV/RT x=(1 atm)(17.6 L)/(0.0821)(273 k) x = 1.27348295454546 1.27348295454546 x 2 = 2.54696590909092 Grams= Moles x 18.0 Grams = 2.54696590909092 x 18.0 ...
*July 13, 2011 by Bradley*

**Math**

The gas tank of a car holds 20 gallons of gas. A gallon of gas costs $1.22. When the tank was filled it cost $20. About what percent of the tank was filled?
*March 21, 2011 by Sammy*

**physics/chemistry**

A rigid tank contains 0.40 moles of oxygen (O2). Determine the mass (in kg) of oxygen that must be withdrawn from the tank to lower the pressure of the gas from 37 atm to 23 atm. Assume that the volume of the tank and the temperature of the oxygen are constant during this ...
*January 3, 2011 by kate*

**physics**

A large water tank is 18m above the ground. Suppose a pipe with a diameter of 8cm is connected to the tank and leads down to the ground. How fast does the water rush of the piper at ground level? Assume that the tank is open to the atmosphere.
*December 11, 2012 by zoe*

**College Chemistry**

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 50. cm3. If the combustion of this mixture releases 955 J of energy, to what volume will the gases expand against a constant pressure of 675 torr if all the energy of combustion is...
*October 31, 2011 by Amanda*

**9th gradae physical science**

teh density of copper is 8.92 g/cm3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?
*January 20, 2012 by allie*

**AP CALCULUS!!! HELPP**

related rates: the base of a pyramid-shaped tank is a square with sides of length 12 meters, and the vertex pyramid is 13 meters above the base. the tank is filled to a depth of 5 meters, and water is flowing into the tank at the rate of 2 cubic meters er second. find the rate...
*April 14, 2011 by Raven*

**Math**

Two hoses are connected to a swimming pool. Working together, they can fill the pool in 4 hr. The larger hose, working alone, can fill the pool in 6 hr less time than the smaller one. How long would it take the smaller one, woking alone, to fill the pool? Please use the work ...
*November 5, 2011 by Skylar*

**Chemistry**

A sheet of aluminum foil has a total area of 1.000 ft squared and a mass of 3.636 grams. What is the thickness of the foil in millimeters? (Density of Aluminum is 2.699 grams/cm cubed.)
*September 12, 2008 by Paige*

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