Thursday

April 24, 2014

April 24, 2014

Number of results: 4,793

**science (density)**

1) mass=100g, volume=10ml,density= 2) volume=7ml, mass=70g, density= 3) mass=50g, volume=10cm3, density= 4) volume=30cm3,mas=90g,density= 5) mass=120,volume=6ml,density= Thanks everyone i apresheate your help.
*Thursday, October 9, 2008 at 4:29pm by Carly*

**science (density)**

1) mass=100g, volume=10ml,density= 2) volume=7ml, mass=70g, density= 3) mass=50g, volume=10cm3, density= 4) volume=30cm3,mas=90g,density= 5) mass=120,volume=6ml,density= Thanks everyone i apresheate your help.
*Thursday, October 9, 2008 at 4:37pm by Carly*

**Ecology**

What are the types of population density measure and how each may be determined? Airkon Population density is a measurement of the number of people in an area. It is an average number. Population density is calculated by dividing the number of people by area. Population ...
*Sunday, October 8, 2006 at 1:27pm by airkon*

**chemisrty**

can anybody give me the density of arsenic oxide at STP is this the correct formula volume = mass/ density thanks Yes, but if you want the density, it is density = mass/volume. The number I have seen floating around on this board is 17.8 g/L but the density of a gas and the ...
*Sunday, February 4, 2007 at 2:34pm by bex*

**Chemistry**

If the column of water in the water barometer fore to a height of 35ft, what would the atmospheric pressure be in mm Hg? mmH20X(density of water/density of Hg)= mmHg Density of water=0.99707 Density Hg=13.5340
*Friday, February 11, 2011 at 1:45am by Brian*

**chemistry**

given the density of helium is 0.1785g/cm3 and the density of argon is 1.784g/cm.3 estimate the density of neon
*Sunday, October 28, 2012 at 4:14pm by Jessa*

**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...
*Tuesday, August 30, 2011 at 3:35pm by ALISON*

**Density**

Can you identify a metal if you know its density? Explain It depends upon how accurately the density is determined. In some cases, especially where the "unknown" has a density that isn't close to another metal, yes, the density can identify the metal with a high degree of ...
*Tuesday, August 29, 2006 at 10:03pm by John*

**Science**

What is the mass of 15mL sample of mercury? Look up the density of mercury. mass = volume x density. Make sure the density is in g/mL. If it isn't you will need to convert it. One place to find density of mercury is at www.webelements.com and click on element #80. I don't ...
*Thursday, November 16, 2006 at 6:11pm by Crystal*

**phy**

Calculate the density for a rectangular block using the following measurements. Length: 2.70 cm, Width: 1.10 cm, Height: 9.09 cm, Mass: 72.17 g. Round your answer for density to 2 decimal places. Include the correct unit for density. Show your work
*Wednesday, May 18, 2011 at 8:01am by irtaza*

**Physical Sciance**

Calculate the density for a rectangular block using the following measurements, Length: 2.70cm, Width:1.10cm, Height: 9.09cm, Mass: 72.17g. Round your answer for density to 2 decimal places. Include the correct unit for density.
*Tuesday, February 26, 2008 at 7:47pm by Devin*

**science(physics)**

Density is the ratio of mass to volume. Mercury has a density of 1.36 x 10^4 kg/m^3. What is the density of mercury in units of g/cm^3?
*Wednesday, September 5, 2007 at 10:07am by jen*

**Dobson**

a)The element with the greatest density is osmium, which has a density of 22.6g/cm3. Calculate the mass of 32.1 cm3 of osmium. b)A team of students determined the density of a sample of wood to be 0.52 g/cm3. A handbook of chemistry reported the density of 0.548 g/cm3 for the ...
*Friday, March 26, 2010 at 7:41pm by Anonymous*

**chemistry**

silver has density of 10.5 g/cm3 and gold has a density of 193.g/cm3 which liquid is denser silver and gold are liquids? That's news to me. You're given the ratios for density, which ratio is greater 10.5gm/cm^3 or 193gm/cm^3? It appears gold is over 18 times as dense as ...
*Sunday, September 10, 2006 at 5:57pm by delonte*

**Chemistry**

Can you convert density to moles? I am given the density of a substance [0.789 g/mL] but I need to know the number of moles for the equation. You cannot convert density to moles, unless you also know the volume and the molecular formula. (density) * Volume = mass = (# of moles...
*Thursday, December 28, 2006 at 8:12pm by Alexandria*

**science, density**

The density of sea water is slightly higher than that of fresh water. The higher density is due to the fact that sea water contains salts such as sodium chloride and magnesium chloride. Suppose you have a container that holds 5.00 kg of fresh water, which has a density of 1.00...
*Tuesday, September 28, 2010 at 12:11am by lisa *

**Physics**

what is the general relationship between the density of solids and the density of liquids? Are you talking about the density of substance X in the solid state vs the density of the same substance in the liquid state. GENERALLY, solids have a higher density than the ...
*Sunday, October 1, 2006 at 9:12pm by Katrina*

**physics**

A 650 kg weather balloon is designed to lift a 4600 kg package. What volume should the balloon have after being inflated with helium at 0 degrees celcius and 1 atm pressure to lift the total load? The buoyancy force must equal the weight lifted. Let V be the volume. g*[(He ...
*Wednesday, May 9, 2007 at 3:30am by Anonymous*

**Chemisty**

when filling a flask to measure the density of a sugar water solution, a student leaves an air bubble at the top of a 20.7 mL flask. How will the density the student calculates differ from the actual density?
*Tuesday, September 22, 2009 at 12:19am by Mike*

**physic**

Assuming uniform density, how much would 1.1 cubic centimeters of neutron star material weigh on the surface of the earth? You need the density of the neutron star to do this. weight= mass*g=density*volume*g
*Wednesday, May 23, 2007 at 11:45pm by x*

**Physics**

mass of an unknown sample is 0.240 kg in air and 0.208 kg when in oil of density=800 kg/m^3. Determine volume and density. Is the density 0.240/800?
*Saturday, December 15, 2012 at 10:29pm by Helen*

**physics**

mass of an unknown sample is 0.240 kg in air and 0.208 kg when in oil of density=800 kg/m^3. Determine volume and density. Is the density 0.240/800?
*Tuesday, December 18, 2012 at 5:37pm by Helen*

**logan high school**

The density of copper is 8.95g/cm3 and the density of zinc is 7.14 g/cm3, A sample of a Cu-Zn is 80.5 percent Cu and 19.5 percent Zn What is the density of the alloy?
*Tuesday, February 16, 2010 at 12:53am by mala*

**chemistry - density and error (check)**

Calculate the density of earth and the density error. i got the answer 5.57*10^3k +/- 9.60 *10^7kg/m is that the correct answer? please help
*Monday, January 24, 2011 at 7:43am by Farah*

**Physics-Math**

1.5 m3 of water is mixed with 0.50 m3 of alcohol. Density of water is 1000 kg m–3 and density of alcohol is 800 kg m–3. Whats the density of the mixture with volume 2.0 m3?
*Tuesday, September 13, 2011 at 5:02pm by rohan*

**Math! Help! Help! Help!**

Hello a compound with: density of: .80 g/cm^(3) volume of: 1ML what is the mass? How do you conver this? mass = volume x density solve for mass volume = 1 mL = 1 cc = 1 cm^3 density = 0.8 g/cc plug and chug Post your work if you don't understand this and tell us exactly what ...
*Wednesday, January 31, 2007 at 12:09pm by Amber*

**physics**

1.5 m3 of water is mixed with 0.50 m3 of alcohol. Density of water is 1000 kg m–3 and density of alcohol is 800 kg m–3. Whats the density of the mixture with volume 2.0 m3?
*Tuesday, September 13, 2011 at 6:16pm by lola*

**Calculus**

Consider the lamina ( with uniform density .01m) having the shape of the region Q in the xy-plane: 1≤x^2+y^2≤4. The density at each point P varies directly with the distance from P to the origin, with density at the point P(2,0,0) being 10kg/m3.Find the polar ...
*Thursday, May 2, 2013 at 3:03pm by JOhn*

**Science ASAP please**

1. Which of the following is an example of density? (1 point) ice floating on top of a river convection currents that cause wind oil spill cleanup all of the above 2. What type of property is density? (1 point) chemical property size-independent physical property all of the ...
*Tuesday, April 9, 2013 at 8:05pm by Delilah*

**Physics**

i'm having trouble with this Which of the following statements about floating objects is correct? a. the object's density is greater than the density of the fluid on which it floats b. the object's density is equal to the density of the fluid on which it floats c. the ...
*Friday, February 20, 2009 at 5:28pm by Bella*

**physics**

The density of liquid carbon dioxide is about 0.8 g/cm^3. What volume fraction inside the fire extinguisher (when full) is occupied by CO2? The density of CO2 gas is negligible compared to the density of liquid CO2. My answer was 75%. Please verify. Thanks.
*Monday, December 23, 2013 at 5:15pm by Alice*

**physics**

a) what is the density of a log floating in salt water if 42% of its volume is exposed? The density of salt water is 1025 kg/m^3 (b) What is the density of a sample of metal that sinks in water at 7.2 m/s^2
*Sunday, November 22, 2009 at 2:58pm by Sandhya*

**Science ~CHECK MY WORK PLEASE~**

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the density by ...
*Tuesday, January 28, 2014 at 3:24pm by Wendy*

**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.
*Saturday, December 15, 2012 at 8:18pm by Samantha*

**Science 8R - Homework Qs. Check **

If an object has mass of 70.5g and a volume of 64 cm(3), what is its Density? Will it sink or float and why? Answer - The Density of this object is 4512g/cm(3). It will sink because the amount of grams is a lot. Is the answer correct and good???? I multiplied 70.5 and 64 in ...
*Monday, October 15, 2012 at 8:27pm by Laruen*

**physic**

A 16 g piece of glass floats in bromoform (density = 2.89 g/ cm3) but sinks in bromobenzene (density = 1.52 g/ cm3), in which it has an appparent mass of 3.84.. What is the density of the glass ( in g/ cm3):
*Monday, April 23, 2012 at 8:22pm by Reem*

**Statistics**

If Y1 is a continuous random variable with a uniform distribution of (0,1) And Y2 is a continuous random variable with a uniform distribution of (0,Y1) Find the joint distribution density function of the two variables. Obviously, we know the marginal density functions of each ...
*Sunday, November 15, 2009 at 10:28pm by Sean*

**Physical Science**

The density of sea water is slightly higher than that of fresh water. The higher density is due to the fact that sea water contains salts such as sodium choride and magnesium chloride. Suppose you have a container that holds 5.00 kg of freshwater, which has a density of 1.00 g...
*Tuesday, August 24, 2010 at 6:55pm by Spazzo*

**probability**

a box contains 25 computer diskettes, 5 of which are double density and the remiander are high density. A second box contains 15 diskettes, 10 double density and 5 high density. A box is selected at random and then two diskettes are chosen randomly from the selected box. What ...
*Sunday, October 7, 2007 at 8:49pm by Josh_DB9*

**Chemistry;HELP**

Use the 5-step method and be sure to include units where appropriate. Round your answers to the correct number of significant digits. Mass m Density = -------------- or D = ------- Volume v Adjust the density formula and solve the problems below: m D = ------- Original ...
*Wednesday, January 16, 2013 at 2:35pm by Victoria*

**Density**

If the actual density is 1.2686 g/mL and the determined density by experiment was 1.0275 g/mL, is it reasonable to conclude the obtained product was fairly pure. I am writing a lab report and these were my results and interpretation, but I am not sure if the difference between...
*Monday, November 30, 2009 at 10:38pm by CMM*

**Chemistry**

A bottle that holds 250 grams of water holds only 175 grams of gasoline. What is the density of the gasoline? Take the density of water to be 1.0 g/ml mass = volume x density. Rearrange to find volume = mass/density volume of the bottle = 250/1.00 = ?? Now that you know the ...
*Thursday, February 15, 2007 at 6:00pm by Sarah*

**Chemistry**

How can you solve for a derived unit involving density? I dont know what you mean. Density is a derived unit, no mater what the units used are. Do you have an example of what you are doing? Yes. What is the mass of a sample of material that has a volume of 55.1 cm^3 and a ...
*Thursday, January 18, 2007 at 6:20pm by Whitney*

**Chemistry;HELP**

Use the 5-step method and be sure to include units where appropriate. Round your answers to the correct number of significant digits. Mass m Density = -------------- or D = ------ Volume v Adjust the density formula and solve the problems below: m D = ------- Original Formula...
*Wednesday, January 16, 2013 at 2:32pm by Victoria*

**mass/density**

If 1 cc of a substance has a mass of 1.5 g, the density is what? I think it is 1.5 but not sure. density = mass/volume d = 1.5 g/1 cc = 1.5 g/cc.
*Sunday, February 4, 2007 at 3:30pm by hollie*

**science**

Using Dimensional analysis, how do you set up a problem to find the density when given mass and volume? Suppose the mass of an object is 40 grams and the volume is 20 mL. Density has units of grams/mL. Then density = 40 g/20 mL = 2 g/mL. If this isn't exactly what you were ...
*Monday, August 21, 2006 at 9:46pm by Anne*

**Physics**

A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20×10^4 Pa, while in the region of blockage it is 1.15×10^4 Pa. ...
*Wednesday, November 12, 2008 at 9:53pm by Andrea*

**Physics Fluids**

When a crown of mass 14.7 kg is submerged in water, an accurate scale reads only 13.4 kg. Is the crown made of real gold? Ok How do I do this problem I set up my free body diagram Net Force = ma = 0= Ft + Fb - Fg were Ft is the force of tension on the scale that was used to ...
*Friday, October 23, 2009 at 5:20pm by Physics Fluids*

**astrophysics**

Mars has a mean density less than the mean density of the Earth's mantle. How is it possible that Mars could have a metallic core given this fact? Hint: No calculations are required. Compare the densities used in part a) with the density of mantle rocks like basalt at one ...
*Thursday, November 26, 2009 at 1:46am by cosmos*

**Earth science**

The inner core of the Earth is solid because of increased___________ a.)density and composition b.)density and temperature c.)temperature and pressure d.)pressure and density
*Saturday, January 12, 2013 at 10:28pm by ?*

**earth science**

#16 the inner core of the earth is solid because of increased__________ a> density and composition b> density and temperature c> temperature and pressure d> pressure and density
*Sunday, January 13, 2013 at 2:52pm by ?*

**chemistry**

Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water, determine the constants m and b in the equation Molarity = m⋅density + b that relates the NaCl molarity to the NaCl(aq) density. Take the density of water to be 1...
*Tuesday, May 28, 2013 at 2:49pm by Anonymous*

**Physics**

What is the acceleration of an 0.4m aluminum cube with a density of 2.72 in a beaker of methanol, which has a density of .791?
*Wednesday, February 1, 2012 at 4:29pm by Daisy*

**Density Problem**

The moon has radius 1740 km and mass 7.35x10^22? kg.What is its average density?
*Sunday, November 17, 2013 at 1:14am by xavier*

**Science**

If the density of a steel hammer 7gm/cm on earth what would the density be on a spaceship?
*Thursday, March 20, 2014 at 5:27pm by Mark*

**Math/Chemistry**

The density of water i 1.00 g/cm^3. Express this density in lb/ft^3. (1 lb = 454 grams)
*Monday, September 22, 2008 at 6:54pm by Claire*

**physics ( DENSITY )**

Assume that the density of a human is 1.13 g/cm3. What is the volume of a 51.5 kg person?
*Thursday, May 31, 2012 at 7:31pm by alyssa*

**Biology**

Describe how density-dependent and density-independent factors regulate population growth.
*Thursday, October 5, 2006 at 3:25pm by Anonymous*

**Honors Biology**

What does it mean when you compare and contrast the characteristics of density-dependent and density-independent?
*Saturday, October 18, 2008 at 11:33am by Randy*

**chemistry**

Answers for copper has a density of 8.92g/cm3 and nickel has a density of 8.90 . which one is denser
*Thursday, November 4, 2010 at 5:17pm by Anonymous*

**Science (Chemistry)**

The Average density of Earth is 5.52g/cm^3. What is its density in a. kg/m^3 b. lb/ft^3. Please help me set up these equations. Thank you!
*Monday, June 13, 2011 at 4:16pm by Grace*

**chemistry**

nonane has a density of 0.79 g/mL and boils at 151 celsius. will it float or sink in water (density of 1.00 g/mL)
*Wednesday, July 27, 2011 at 1:02pm by melissa*

**Physics**

Estimate the density of the water 6.0 deep in the sea. By what fraction does it differ from the density at the surface?
*Tuesday, November 15, 2011 at 7:51pm by Anonymous*

**physics**

Why we use square root of density in Grahms law instead of simpl density?
*Wednesday, September 25, 2013 at 11:43pm by Anonymous*

**Chemistry**

a) The element with the greatest density is osmium, which has a density of 22.6g/cm3. calculate the mass of 32.1 cm3 of osmium. Answer: 22.6g x 32.1 = 725.46 Did I have right answer? b) A team of students determined the density of a sample of wood to be 0.52g/cm3. A handbook ...
*Friday, April 2, 2010 at 8:09am by Anonymous*

**chemistry**

Convert a density of 2.74 x 103 g/L into a density with dimensions of kg/mL. please show how would this conversion be done.??
*Monday, September 6, 2010 at 6:19pm by Jack*

**Chemisry**

What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. The density of the solution is 0.995 g/mL. Please show work, thank you!
*Saturday, February 23, 2013 at 11:45am by Rena*

**Math(Please help, thank you)**

I am trying to calculate my percent error for an experiment conducted. I need to compare my average density calculated to the accepted average density but I am having trouble doing this because of the conversions. My average density was 0.12 g/mm^3. The accepted value is for ...
*Wednesday, August 29, 2012 at 1:55pm by Hannah*

**chemistry**

calculate the density of NO3 gas at 0.970mm Hg and 35C Take 1 liter. calculate n in PV=nRT then, density= mass/volume= (n*molmassNO3)/1liter. I STILL DONT UNDERSTAND HOW TO DO IT COULD U PLEASE EXPLAIN What don't you understand about PV = nRT and how that fits your problem. Or...
*Tuesday, January 9, 2007 at 6:57pm by TIFFANY*

**chem 111**

Average density of a copper-coated iron BB is 8.00g/mL. If the density for copper is 8.92 g/mL, and the density for iron is 7.43g/mL, what is the percentages of copper and iron in a BB?
*Thursday, September 11, 2008 at 3:23pm by Heather*

**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? Tutor Answer: Use density = mass x volume to convert 50 g ethanol to volume and to convert 50....
*Tuesday, November 29, 2011 at 9:24pm by Shelly*

**physics**

What is the apparent weight of a 36 kg block of aluminum (density 2700 kg/m3) completely submerged in a fluid with density 1300 kg/m3?
*Tuesday, November 30, 2010 at 5:38pm by kate*

**chem (measurements & dimensional analysis)**

the density of regular gasoline is 0.9854 g/cm3. What is the density in lbs/gal
*Monday, October 29, 2012 at 4:49pm by Maria*

**Chemistry**

Density of a metal cube of dimension 10 inches X 10 inches x 10 inches is 8.05g/cm3. What is its mass? 10inches? isnt that 25 cm? So get the volume in cm^3 by multiplying the three dimensions in cm. Multipy that volume by density. Mass= density*volume
*Sunday, June 10, 2007 at 2:49pm by Brooke*

**physics**

The nucleus of a hydrogen atom is a single proton, which has a radius of about 1.0 10-15 m. The single electron in a hydrogen atom normally orbits the nucleus at a distance of 5.3 10-11 m. What is the ratio of the density of the hydrogen nucleus to the density of the complete ...
*Friday, December 1, 2006 at 10:43am by MIke*

**8th grade science**

The densities of four different woods are shown below. Wood Sample Densities Type of wood: African Teakwood Density(g/cm3) 0.98 Type of wood: Balsa Density(g/cm3) 0.14 Type of wood: Cedar Density(g/cm3) 0.55 Type of wood: Ironwood Density(g/cm3) 1.23 Which wood will sink when ...
*Tuesday, April 3, 2012 at 7:52pm by Lana Grib*

**chemistry**

water has a density of 1g/cm3 ; if 2 different pieces of the wood are put into water which will float and which will sink ? Wood 'a' has a density of 1.19g cm3 Wood "b" has a density of .67 g/cm3 Explain your answer?
*Sunday, August 19, 2012 at 8:40pm by maria*

**chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*Wednesday, February 1, 2012 at 2:25pm by victoria*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*Tuesday, September 3, 2013 at 2:30pm by Elizabeth*

**Chemistry**

a chemist needs 2.00 grams of a liquid compound witha density of 0.785 g/cm^3 density. what volume of compund is required?
*Tuesday, September 3, 2013 at 2:45pm by Elizabeth*

**math**

what is the density of the block? density is 2700 volume is 10^-4
*Sunday, November 15, 2009 at 6:08pm by Annie*

**chemistry**

Water (density = 1.00 g/mL) will float on hexane (density = 0.95 mL).
*Sunday, April 3, 2011 at 7:56am by Anonymous*

**earth**

#16 the inner core of the earth is solid because of increased__________ a> density and composition b> density and temperature c> temperature and pressure d> pressure and density
*Sunday, January 13, 2013 at 3:42pm by ?*

**physics**

A rectangular box of negligible mass measures 5m by 1m by .5m. How many kgs of mass can be loaded onto the box before it sinks in the water? V=5*1*.5 = 2.5m^3 density of water =1g/cm^3 =1000 kg/m^3 I also know that when the density of the mass is greater than the density of ...
*Monday, December 3, 2007 at 5:00pm by Tammy*

**physics**

A rectangular box of negligible mass measures 5m by 1m by .5m. How many kgs of mass can be loaded onto the box before it sinks in the water? V=5*1*.5 = 2.5m^3 density of water =1g/cm^3 =1000 kg/m^3 I also know that when the density of the mass is greater than the density of ...
*Monday, December 3, 2007 at 8:06pm by Tammy*

**science**

1. the molar mass of helium is 4.00 g/mol. calculate the volume of 1 mol of helium at STP (T = 273, P = 1 atm) what is the density of helium at STP? 2. the density of an ideal gas is 1.35 kg/m^3. if the temperature is Kelvin and the pressure are both doubled, find teh new ...
*Wednesday, April 23, 2008 at 10:17pm by billystar*

**Science**

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the density by ...
*Friday, November 22, 2013 at 6:19am by Billy Jean Not Mah Lover*

**Science**

Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the density by ...
*Thursday, March 6, 2014 at 11:41pm by Steve*

**ET3034TUx Solar Energy**

The current density of an ideal p-n junction under illumination can be described by: J(V)=Jph−J0(eqVkT−1) where Jph is the photo-current density, J0 the saturation-current density, q the elementary charge, V the voltage, k the Boltzmann's constant, and T the ...
*Wednesday, October 16, 2013 at 2:20pm by Anon*

**Solar Energy Help ASAP**

The current density of an ideal p-n junction under illumination can be described by: J(V)=Jph−J0(eqVkT−1) where Jph is the photo-current density, J0 the saturation-current density, q the elementary charge, V the voltage, k the Boltzmann's constant, and T the ...
*Thursday, October 17, 2013 at 3:50pm by Anonymous*

**science**

how many centimeters cube of olive oil of density 0.92g/ml have the same mass as 1.00L of gasoline of density 0.66g/ml?
*Monday, September 2, 2013 at 2:21pm by keziya*

**physics**

12. The ratio of the tensile (or compressive) strength to the density of a material is a measure of how strong the material is “pound for pound.” (a) Compare tendon (tensile strength 80.0 MPa, density 1100 kg/m3) with steel (tensile strength 0.50 GPa, density 7700 kg/m3): ...
*Monday, November 26, 2012 at 9:21am by mary*

**Density**

A new penny has a mass of 2.54 g and a volume of 0.354 cm3. Is the penny made of pure copper? what is its density? thanks:) Density is mass/volume but I dont know how to find it with g and cm3
*Thursday, August 26, 2010 at 7:04pm by Maria*

**Chemistry**

Average density of a copper-coated iron BB is 8.00g/mL. If the density for copper is 8.92 g/mL, and the density for iron is 7.43g/mL, what is the percentages of copper and iron in a BB?
*Thursday, September 11, 2008 at 7:15am by Heather*

**chem**

Forty miles above the earth's surface the temperature is 250 K and the pressure is only 0.20 mm Hg. What is the density of air (in grams per liter) at this altitude? (Assume the molar mass of air is 28.96 g/mol.) PV=nRT n/V= molar desity= P/RT mass density= molar density*...
*Friday, March 30, 2007 at 1:27am by Helpme*

**HELLO I NEED HELP AND NOBODY EVER HELPS ME.**

1. the molar mass of helium is 4.00 g/mol. calculate the volume of 1 mol of helium at STP (T = 273, P = 1 atm) what is the density of helium at STP? 2. the density of an ideal gas is 1.35 kg/m^3. if the temperature is Kelvin and the pressure are both doubled, find teh new ...
*Wednesday, April 23, 2008 at 11:29pm by billystar*

**physics--pressure**

how high would the atmosphere extend if it were of uniform density throughout, equal to half the present density at sea level?
*Sunday, March 22, 2009 at 8:35am by lisa*

**chemistry**

one mole of a gas occupies 27.0 liters, and its density is 1.41g/l at a particular temperature and pressure. what is its molecular weight? What is the density at STP?
*Sunday, June 28, 2009 at 8:59pm by Bobby*

**physics**

a ball of mass of 4kg,of density 4000kg/m3 is completely immersed in water of density 1000kg/m3.find the force of buoyancy.[g=10m/s2]
*Tuesday, October 23, 2012 at 11:45am by keerthiga*

**Chemistry**

length in cm of one side of perfect cube of gold with a density of 18g/cc and mass of 25g? How would i set up this equation? I don't know what length formula I would use, because I know that i am not supposed to just divide the density by the mass, because that would be ...
*Saturday, September 24, 2011 at 5:11pm by Bob*

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