Monday

July 28, 2014

July 28, 2014

Number of results: 8,443

**Management Science**

Riverside oil company in eastern Kentucky produces 3 different grades of gasoline. They are regular, premium, and supreme grades. Each barrel of regular grade sells for $82 while premium grade sells for $88 per barrel and supreme grade sells for $89 per barrel. Petroleum ...
*March 18, 2013 by Annie*

**marketing**

Mass marketing is dead versus Mass Marketing is still a viable way to build a porfitable brand?
*August 26, 2010 by jhean*

**marketing**

how ca i create a brand name and hw can i say that the name is relevant to the business Thank you for using the Jiskha Homework Help Forum. First of all, you need to pick a business. The yellow pages can give you lots of ideas.
*March 13, 2007 by nina*

**Physics**

Tidal Energy. If we model 2 blades as thin uniform steel bars 15.0m long and .25m in diameter, at what rate (radians/second and revolutions per minute) must they spin for a turbine to store 10^6 J of energy? Keep in mind that the density of steel is 7800kg/m^3 and density is ...
*November 3, 2007 by Christina*

**physics, help with circuits please!**

Can the voltage across any of the three components in the R-L-C series circuit ever be larger than the maximum voltage supplied by the AC source? That maximum voltage is 50 volts in this situation. Also, does Kirchoff's loop rule apply to this circuit? In other words, is the ...
*March 1, 2012 by Jim*

**physics**

which of the following determine terminal speed of an object? 1)color 2)weight 3)air density 4)objects density 5)shape/aerodynamics 6)relative speed between air and object 7)surface area encountered by air. label all that apply?
*January 26, 2012 by taylur*

**calculus**

Sorry to post this again, but I am still unable to understand it and need help. Please help.1) Using 3(x-3)(x^2-6x+23)^2 as the answer to differentiating f(x)=(x^2-6x+23)^3/2, which I have been able to do, I need to find the general solution of the differential equation dy/dx...
*May 22, 2011 by Claire*

**fluid mechanics**

I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? i already did it using formula pressure=density*g*h but i want ans to be 0.165 meters which i dnt ...
*May 30, 2010 by Nick*

**fluid mechanics**

I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? i already did it using formula pressure=density*g*h but i want ans to be 0.165 meters which i dnt ...
*May 31, 2010 by Nir*

**fluid mechanics**

I have got differential pressure from an inclined manometer to be 2.8kPa and density of the fluid is 784kg/m^3. I need to calculate the manometer datum height. how do i do tht?? i already did it using formula pressure=density*g*h but i want ans to be 0.165 meters which i dnt ...
*June 1, 2010 by chika*

**Chemistry help pls helppppp**

What volume of a solution that is 15.7 % (w/w) lolinic acid (density = 1.64 g/mL) contains 4.25 g of lolinic acid? What is the molarity of a 20.2 % (w/w) solution of rossonic acid (423.6 g mol-1) that has a density of 1.78 g mL-1?
*January 31, 2014 by nene *

**Chemistry**

How many moles of bromine are there in a 0.35 mL dichloromethane solution of 10% bromine? Density of Bromine = 3.10g/mL Density of dichloromethane = 1.33g/mL
*January 24, 2013 by Nathan*

**Chemistry**

The molarity of H3PO4 is .01 M. The density of the H3PO4 in the solution is .0009 g/mL. What is the mass percent of H3PO4 in the solution, which has a density of 1.11 g/ml?
*February 18, 2014 by Anonymous*

**math**

A random sample of the houses in a particular city is selected and each of the houses in a particular city is selected and each of the house's level of radon gas is measured. The values collected are given in the table below in parts per million (ppm). 4 8 13 6 7 3 9 8 11 8 a...
*February 1, 2009 by helga*

**physics**

The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 3.25 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?
*November 1, 2012 by Lucy*

**physics**

The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 5.34 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?
*November 17, 2012 by Anonymous*

**fallacies in philosophy**

Michael Jordan wore that brand, so those must be the best basketball shoes. What fallacy would this be. Your exact answer is at the following web page: https://www.virtualschool.edu/mon/SocialConstruction/Logic.html Contracy to Fact Hypothesis.
*June 18, 2006 by selena*

**English**

Ms. sue I am writing a paper on cost of food today. Where can I find graph or table showing the increase in price for food and gasoline. Please help. Rose
*May 11, 2008 by rose- Ms. sue*

**physics**

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the ...
*September 6, 2010 by Jack*

**chemistry**

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the ...
*September 6, 2010 by Jack*

**College Chemistry-Please**

*Only need input not doing it for me. PLEASE QUESTION: Some hydrocarbon fuels have sulfur present and contribute to air pollution. When this solid sulfur is burned in the presence of oxygen, the noxious, toxic gas sulfur dioxide results. If there is .50 grams of sulfur and 1....
*December 4, 2010 by Sue*

**Math**

The Lifetimes of a certain brand of photographic light are normally distributed with the mean of 210 h and a standard deviation of 50 h. What percent of lights will need to be replaced within 233 h? Out of 2000 lights, how many will have a lifetime between 200 h and 400 h?
*June 9, 2011 by Jerry*

**MATH 8 HELP!!!**

NYS 8th grade math curriculum 2013???? This year we have a BRAND NEW curriculum. I just want a list of units and topics in each unit because I want to know what I'm learning and what will I learn next (long story....) please help!!!!
*March 21, 2013 by LARUEN*

**statistics**

The true highway mileage, Y, of a specific brand of hybrid vehicle has a normal distribution with a mean of 42 and a standard deviation of 1.5. Find the probability that a randomly selected hybrid vehicle gets more than 38 miles to the gallon.
*June 17, 2014 by lisa*

**Chem**

Based on the number of atoms per unit cell and the mass of the atom, the mass of the unit cell can be calculated. The density of the unit cell and the material as a whole can be determined from the mass and the volume of the unit cell as. D= M/V The usual units of density are ...
*January 16, 2009 by Juliee*

**Physics**

Calculate the force required to pull a copper ball of radius 2.00 cm upward through a fluid at the constant speed 9.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force. Forcedrag=k v = .950kg/s * .09m...
*March 1, 2007 by Jean*

**physics**

An empty rubber balloon has a mass of 0.0100 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.300 m. If the filled balloon is fastened to a vertical line, what is the tension in the line?
*December 20, 2010 by april*

**chemistry**

Mercury(Hg) has a density of 13.5 g/cm cubed. How much space would 50.0 g of mercury occupy? Calculate the mass in grams, of a 3 cubic inch cube of aluminum(Al). The density of aluminum(Al) is 2.5 g/cm cubed. NOTE:(1inch cubed =16.4 cm cubed
*June 9, 2012 by John*

**Physics**

Estimate the terminal speed of a wooden sphere (density 0.770 g/cm3) falling through air, if its radius is 9.00 cm and its drag coefficient is 0.500. (The density of air is 1.20 kg/m3.) (b) From what height would a freely falling object reach this speed in the absence of air ...
*January 24, 2010 by ucieng*

**Physics**

Estimate the terminal speed of a wooden sphere (density 0.770 g/cm3) falling through air, if its radius is 9.00 cm and its drag coefficient is 0.500. (The density of air is 1.20 kg/m3.) (b) From what height would a freely falling object reach this speed in the absence of air ...
*January 24, 2010 by ucieng*

**physics**

The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 4.41 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water? ...
*February 9, 2012 by hannah*

**Physics. Free electron density, please help!**

A length of wire has a radius of 3.00 × 10-3 m and a resistance of 0.200 Ω. When the potential difference across the wire is 10.0 V, the electron drift speed is found to be 2.98 × 10-4 m/s. On the basis of these data, calculate the density of free electrons in the wire. ...
*November 21, 2012 by samantha*

**general physics**

The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 6.76 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?
*July 20, 2013 by please help with these practice problems*

**mathematics**

A cylindrical gasoline can is 18 inches across and 20 inches tall. which expression represents the approximate volume in cubic inches ? 1) (3.14)(9)2(20) 2) (3.14)(9)(20)2 3) (3.14)(18)(20) 4) (3.14)(18)2(20) 5) (3.14)(36)2(20)
*August 29, 2011 by unknown*

**chem**

a 10.0% sucrose solution has a density of 2.00 g/mL. what is the mass of sucrose dissolved in 1.00 liter of this solution? thanks, mary Well, in a liter, there are 2000 grams (from density), and 200 of those are sucrose.
*April 21, 2007 by mary*

**Physics**

An alloy of copper and gold displaces 1.935 cm^3 of water. It has a mass of 33.44g. If gold has a density of 19.3g/cm^3 and copper has a density of 8.9g/cm^3, what is the percent of gold by mass in the object?
*December 11, 2007 by Anonymous*

**physics**

n alloy of copper and gold displaces 1.935 cm^3 of water. It has a mass of 33.44g. If gold has a density of 19.3g/cm^3 and copper has a density of 8.9g/cm^3, what is the percent of gold by mass in the objec
*December 11, 2007 by Anonymous*

**physics**

A column of water of height h1 = 70.0 cm supports a column of an unknown liquid h2 = 30.0 as suggested in the figure (not drawn to scale). Assume that both liquids are at rest and that the density of water is 1.0x103 kg/m3. Determine the density of the unknown liquid.
*January 17, 2010 by sara*

**Chemistry**

What is the mass/ vol% ethanol in an ethanol water solution with density of 0.875g/ml and containing 65% ethanol by volume? The density of pure ethanol is 0.789g/ml? My calculation 0.875g/ml x 1000ml x 0.65/ 46.06 = 12.34m 12.34/0.789g = 15.6g I am not sure answer. Pls help
*August 18, 2012 by Fai*

**Dr. Bob, help please**

does the density of an element have anything to do with the number of elections? i have to work with a partner and his reasoning is this: "the higher the atomic number, the greater the density because the atomic number is made up of protons so the more protons there are, the ...
*October 1, 2012 by josh*

**Chemistry**

Calculate the height, in feet, of a column of water that would exert the same pressure as a column of mercury that is 754 mm high. (The density of mercury is 13.6 g/cm3 and the density of water is 100 g/cm3.)
*June 14, 2009 by Zandria*

**Chemistry.**

What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 13.7 L of water to produce an antifreeze solution with a freezing point of -30.0”ĘC? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.)
*November 23, 2009 by ?*

**Chemistry**

What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 13.7 L of water to produce an antifreeze solution with a freezing point of -30.0”ĘC? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.)
*November 23, 2009 by fdqed*

**Physics**

How is it that ships made largely of steel can float when the density of steel is much higher than the density of water? Why is it possible to make oil tankers much larger than other ships (and what happens when an oil tanker is unloaded?)
*August 6, 2013 by Cheyenne*

**Physics**

How is it that ships made largely of steel can float when the density of steel is much higher than the density of water? Why is it possible to make oil tankers much larger than other ships (and what happens when an oil tanker is unloaded?)
*August 7, 2013 by McKenzi*

**math **

suppose you drive a car with an average gas mileage of 31 miles per gallon.if you plan to take a 3000 mile cross countrytrip,how many gallons of gasoline should you expect to use?
*July 3, 2012 by verkesia*

**Science**

how can using biomass fuel instead of gasoline in car engines help conserve natural resources? It burns more fossil fuels It reduces the use of coal<--- It uses a renewable resource
*May 29, 2014 by Anonymous*

**math**

When 6 gallons of gasoline are put into a car's tank the indicator goes from 1/4 of a tank to 5/8. What is the total capacity of the gas tank?
*August 28, 2012 by Myra*

**math**

A cylindrical gasoline can is 18 inches across and 20 inches tall.which expression represents the approximate volume in cubic inches? (1)(3.14)(9)2(20) 2) (3.14)(9)(202)2 3) (3.14)(18)(20) 4) (3.14(18)2(20) 5) (3.14(36)2(20)
*November 15, 2012 by nadia*

**science**

why doesn't density depend on size? If you cut a block in half, and put it in water, wouldn't the density change because I think half a block wouldn't sink all the way in water?
*April 22, 2009 by Angie*

**chemistry**

The density of acetonitrile (CH3CN)is 0.786 g/mL, and the density of methanol (CH3OH)is 0.791 g/mL. A solution is made by dissolving 24.5mL (CH3OH)in 98.9mL (CH3CN). What is the mole fraction of methanol in the solution?
*September 11, 2012 by Anonymous*

**chemistry**

the density of water 20 degrees celcius is 1.00g?mL and the densityof ethylene glycol is 1.114g/mL, if 100.0mL if water is combined with 25.0mL is ethylene glycol, what would be the density of this mixture?
*October 17, 2012 by mat *

**statistics**

Suppose that the number of accidents occurring in an industrial plant is described by a Poisson process with an average of 1.5 accidents every three months. During the last three months, four accidents occurred. (a)probability that no more than 12 accidents will occur during a...
*September 30, 2011 by Michael *

**Chemistry**

I need to work out the density of the gaseous oxide of arsenic at STP in g L-1 I realise density = mass/volume but my answer works out very high!! I have already worked out the volume to be 52cm^3 (Cubed). the mass to start with was 0.702g and at the end of the reaction was 0....
*January 31, 2007 by Annabel*

**Density of Gas at STP**

Hi Can anyone explain how to calculate the density in g l -1 of a gaseous oxide at STP. I dont understand the term g l -1 !! Thank You "g l-1" should have the -1 as a superscript, meaning g l^-1, or g/l. It means they want the density in grams per liter. There are 22.4 liters ...
*January 24, 2007 by Freddo*

**chemistry**

Calculate the mass percent of methanol, ethanol, and MTBE (answers must be received in that order) that must be present in gasoline to yield a mixture of 1.3 % oxygen by weight.
*April 12, 2010 by Laura*

**science**

in a gasoline engine, the area in the cylinder head where the air-end and-fuel mixture is burned is called the A. piston B. cylinder c. combustion chamber D. intake valve
*January 30, 2014 by Anonymous*

**density and density error (check calculations)**

Calculate the density of earth and its density error d=m/v where m = 6.00*10^24kg and v = (4/3)(pi)(6359000)^3 = 1.07709...*10^21 m^3 therefore d=6.00*10^24/1.07709...*10^21 m^3 d = 5570.5254...kg/m^3 using the sig fig rule, in division and multiplication take the least ...
*January 24, 2011 by Farah*

**chemistry**

A solution contains 4.44% by mass of NaI in water. Calculate the molarity of the NaI, if the density of the solution is 1.2711 g mL-1. i got the answer to be 8.48 M... the percent mass is irrelevant information, right? i figured out the answer just by the given density alone.
*November 11, 2007 by keely*

**math**

Suppose the income (in tens of thousands of pesos) of employees at University X can be approximated by a continuous distribution with density f(x) = ( 2x2; if x 2 0; if x < 2 Find the probability that a randomly chosen employee has an income between P30,000 and ...
*October 26, 2012 by vilma*

**math**

Suppose the income (in tens of thousands of pesos) of employees at University X can be approximated by a continuous distribution with density f(x) = ( 2x2; if x 2 0; if x < 2 Find the probability that a randomly chosen employee has an income between P30,000 and ...
*October 26, 2012 by vilma*

**brand image**

How do the components of Adidas create the product image? The components are the Logowhich is the 3 stripes, is there a trademark for Adidas? The other component is the slogan which isImpossible is nothing.
*May 9, 2011 by mary*

**College Chem NEED HELP**

Calculate the moles of N(2) in a 3.50 litercontainer at 1.15 atm pressure and 28 degrees C. What is the Density of the gas? What is the new pressure if the temperature is raised to 75 degrees C? What is the new density of the gas?
*January 31, 2011 by Nicole*

**Physics**

One cm of a 10-cm-long rod is made of metal, and the rest is wood. The metal has a density of 5000 kg/m3 and the wood has a density of 500 kg/m3. When the rod is set into pure water, the metal part points downward. How much of the rod is underwater?
*December 16, 2010 by Sara*

**Physics **

an open tank contains a layer of oil floating on top of a layer of water (of density 1000 kg/m3) that is 3.0 m thick, as shown. What must be the thickness of the oil layer if the gauge pressure at the bottom of the tank is to be 9.1×104 Pa? The density of the oil is 880 kg/m3?
*April 17, 2014 by Brady*

**Chemistry **

An object made of aluminum has a mass of 8.37g. When it was placed in a graduated cylinder containing 20.0mL, the water level rose to 23.1mL. Calculate the density and the specific gravity of the object. For the density I got 2.7g/mL, and for specific gravity I got 0.135g/mL...
*September 18, 2010 by Eric*

**Chemistry**

The vapor pressure of an unknown substance is given at various temperatures. properties of the substance are: density of solid=1.375g/ml density of liquid= 1.150g/ml. freezing point= 275.0K boiling point=375.0 K How would i calculate the vapor pressure at 150.0K
*February 7, 2012 by Gifty Ansah*

**Science**

Overpopulating rabbits in Australia were finally controlled by a disease spread trough the population. A higher death rate was recorded in regions with large population than small population. The disease can be considered.... A. A density-dependent factor. B. A density-...
*December 5, 2009 by Kaled*

**CHEM**

a gas bulb is connected to an open end manometer. the pressure in the bulb is .355 torr MORE than atmospheric pressure. If the manometer is filled with mineral oil (density .888 g/cm^3) then what wil be the difference in height between the two sides of the manometer? (density ...
*March 21, 2011 by Joanie*

**science**

a piece of wood that measures 3.0 cm by 4.0 cm by 5.0 cm has a mass of 90.og. what is the density of the wood? would the piece of wood float in water? remember the density of water is 1.00g/ml
*June 21, 2011 by dylan*

**Chemistry**

At 20 degrees C ethanol has a density of 0.789 g/ml and H2O has a density of 1.0 g/ml. What is the % by volume of ethanol of a solution made by adding 50g of ethanol with 50g of H2O?
*November 28, 2011 by Shelly*

**density of Magnesium!**

Magnesium crstallizes in the hcp arrangment. The dimensions of the unit cell are height 520om, length on an edge, 320. Calculate the density of Mg (s) and compare it with the measured value of 1.738 g/cm^3 this is what i did : m= 2* 24.30g/6.022*10^23 = 8.07*10^-23 v= l^2*h v...
*February 6, 2009 by sandy*

**electric physics**

Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.4 cm-3, and their speed is 576 km/s. (a) Find the current density of these protons. (b) If Earth's magnetic field did not deflect the protons, what total current in amperes Earth ...
*April 14, 2009 by sweety*

**chemistry**

Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone and ethanol.
*May 4, 2010 by bob*

**college physics**

One cm of a 10-cm-long rod is made of metal, and the rest is wood. The metal has a density of 5000kg/m^3 and the wood has a density of 500kg/m^3. When the rod is set into pure water, the metal part points downward. How much of the rod is underwater?
*December 6, 2010 by jessica*

**college physics**

One cm of a 10-cm-long rod is made of metal, and the rest is wood. The metal has a density of 5000kg/m^3 and the wood has a density of 500kg/m^3. When the rod is set into pure water, the metal part points downward. How much of the rod is underwater?
*December 6, 2010 by jessica*

**CHEMISTRY**

An ethanol-water solution is prepared by dissolving 10.00 ml ethanol C2H5OH (density=0.789g/ml) in sufficient water to produce 100.00 ml of solution with a density of 0.982g/ml. What is the concentration of ethanol in this solution? Expressed as ml. a.)%volume b.)%mass c.)%m/v...
*November 13, 2013 by ADRIAN*

**Chemistry**

hmmm...I just can't seem to get it. It looks like I got it right up to the volume of the metal point. Don't I have to divide the mass of the metal by the density of the water given before? (0.9970)? I guess I am having a problem with this which results in the wrong answer for ...
*August 22, 2007 by Sara*

**Physics of materials**

Gaseous nitrogen has a density of 1.17 kg/m3 and liquid nitrogen has a density of 810 kg/m3. [The relative molecular mass of nitrogen is 28.0] What is the mean volume per nitrogen molecule in each case? What is the mean separation between nitrogen molecules in each case?
*May 18, 2011 by Francesca*

**Material Physics**

Gaseous nitrogen has a density of 1.17 kg/m3 and liquid nitrogen has a density of 810 kg/m3. [The relative molecular mass of nitrogen is 28.0] What is the mean volume per nitrogen molecule in each case? What is the mean separation between nitrogen molecules in each case?
*May 24, 2011 by Paula*

**Physics**

Two infinitely long slits, S1 and S2, each of width d=0.1 cm are used to prepare a box-shaped electron beam with energy E=400 eV. At what distance x from the slit S2 will the thickness of this electron beam double due to Coulomb's repulsion? The linear density of electron ...
*April 4, 2010 by Anna*

**chemistry**

The equation for burning C2H2 is 2C2H2(g) + 5O2(g) ⎯→ 4CO2(g) + 2H2O(g) a. If 15.9 L C2H2 react at STP, how many moles of CO2 are produced? (Hint: At STP, 1 mol = 22.41 L for any gas.) b. How many milliliters of CO2 (density = 1.977 g/L) can be made when 59.3 mL O2...
*June 2, 2010 by rob*

**math**

suppose you drive a car with an average gas mileage of 32 miles per gallon.If you plan to take a 2500-mile cross country trip,how many gallons of gasoline should you expect to use?
*July 3, 2012 by verkesia*

**7th grade Science**

How does the internal structures of earth's density compare to the lithosphere's density? It is a lot greater, a little greater, a lot smaller or a little smaller?
*January 4, 2009 by Mary Grace*

**Chemistry**

In cold climates, methanol is often used as a gasoline antifreeze and an additive of winer gas. How does it remove water vapour an ice from the gas tank and the fuel line?
*June 14, 2010 by Amy*

**math**

While on his way to school, Norman saw that the cost of gasoline was $2.50 per gallon. Write a direct variation equation to describe the cost y of x gallons of gas. Then graph.
*November 16, 2010 by David*

**business**

Which stage in the consumer purchase decision process suggests criteria to use for the purchase, yields brand names that might meet the criteria, and develops consumer value perceptions
*September 17, 2011 by tiffay*

**physics**

A raft is constructed of wood havig a density of 600kg/m^3. The surface area of the bottom of the raft is 5.7m^2 and the volume of the raft is .60m^3. When the raft is placed in fresh water having a density of 1000kg/m^3, how deep is the bottom of the raft below water level ?
*February 1, 2012 by Kayle *

**Calculus**

The median value of a home in a particular market is decreasing exponentially. If the value of a home was initially $240,000, then its value two years later is $235,000. a) Write a differential equation that models this situation. Let V represent the value of the home (in ...
*June 17, 2014 by Jamie*

**Science- physics**

A balloon weighing 80 kg has a capacity of 1200 m3. If it is filled with helium, how great a payload can it support? The density of helium is 0.18 kg/m3 and the density of air is 1.30 kg/m3. Express your answer in Newtons. I know the answer is 12, 400 Newtons I just don't know...
*October 23, 2011 by Hannah*

**Chemistry**

Calculate the pressure in an evacuated 250. mL container at 0.00 degrees C if 3.20 cm^3 of liquid oxygen evaporates. Assume that the liquid oxygen has a density of 1.118 g/cm^3 I understand that the density and volume can be used to find the mass in grams. However, I'm ...
*May 7, 2012 by Lindsey*

**Physics help**

The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The evolution of our ...
*May 23, 2013 by SOmebody*

**business**

Assume that at the beginning of 2000 Speedy Delivery a Fed Ex competitor purchased a 737 aircraft at a cost of 60,000,000 Speedy Delivery expects the plane to remain useful for 5 years (5 million miles) and to have a residual value of 5,000,000 Speedy Delivery expects to fly ...
*January 5, 2010 by Ronnie*

**Chem**

What is the density of N2O, a gas, at STP? How many moles are in 16 grams of O2? density = mass/volume 1 mol of a gas occupies 22.4 L at STP. density = molar mass/molar volume = ?? #2. 1 mol O2 has a mass of 32 grams? grams = mols/molar mass = ??
*February 5, 2007 by Chris*

**Chemistry**

O.k. I am confused. So here is what I did. Mass of empty flask plus stopper: 37.34g mass of stoppered flask plus water: 63.67g Mass of stoppered flask plus liquid: 52.01g Mass of water: 63.67 - 37.34= 26.33 Volume of Flask(density of H20 at 25*C, 0.9970 g/cm^3: (37.34g)/(0....
*August 22, 2007 by Sara*

**PHYSICS NEED HELP FAST**

a 1.0kg beaker containgin 2.00kg of oil with a density of 916kg/m3 rests on a scale. a 2.0kg block of iron is suspended from a spring scale and completly submerged in the oil, find the euilibrium readings of both scales.density of iron 7860.
*February 13, 2011 by ricki*

**PHYSICS NEED HELP FAST**

a 1.0kg beaker containgin 2.00kg of oil with a density of 916kg/m3 rests on a scale. a 2.0kg block of iron is suspended from a spring scale and completly submerged in the oil, find the euilibrium readings of both scales.density of iron 7860.
*February 13, 2011 by ricki*

**PHYSICS NEED HELP FAST**

a 1.0kg beaker containgin 2.00kg of oil with a density of 916kg/m3 rests on a scale. a 2.0kg block of iron is suspended from a spring scale and completly submerged in the oil, find the euilibrium readings of both scales.density of iron 7860.
*February 13, 2011 by ricki*

**Statistics**

In terms of the mean and standard deviation: -What does it mean to say that a particular value of x has a standard score of +2.1? -What does it mean to say that a particular value of x has a z-score of -2.4?
*October 17, 2011 by Jen*

**statistics**

. In terms of the mean and standard deviation: - What does it mean to say that a particular value of x has a standard score of +1.5? - What does it mean to say that a particular value of x has a z-score of -2.6?
*September 29, 2012 by Anonymous*

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