Friday

February 27, 2015

February 27, 2015

Number of results: 55,914

**Physic**

The density of gold is 19.3 g/ml. If the statue is solid gold, how much does it weight?
*August 16, 2014 by Asma*

**Chemistry**

The density of solid W is 19.3 g/cm3. How many atoms are present per cubic centimeter of W? As a solid, W adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of W? What is the volume of a unit cell of this metal? What is the edge length...
*January 18, 2013 by Anonymous*

**chemistry**

A student breaks a thermometer and spills most of the mercury (Hg) onto the floor of a laboratory that measures 15.2 m long, 6.6 m wide, and 2.4 m high. (a) Calculate the mass of mercury vapor (in grams) in the room at 20 degrees celcius. The vapor pressure of mercury at 20 ...
*September 21, 2011 by Amber*

**math/chemisty**

Find the volume of a starburst candy (220 cm cubed). The mass is 5.14 grams. Calculate it's density. How many starburst would it take to fill your locker (139,200 cm cubed)? Use dimensional analysis to solve this problem.
*September 8, 2013 by jj*

**Science**

A 400 kg. wooden log is floating with 0.2 of its volume above water level. Given that the density of iron is 7.8 gram per centimeter cubic, calculate the least mass of iron object attached to the underside of log that will sink it.
*October 25, 2013 by Uddeshya*

**math**

A square shaped park measures 3/5 mile long on each side. What is the area of the park?
*November 8, 2010 by marty Martinez*

**math**

If a cardboard box measures 1 1/2 feet on each side what expression will represent the volume of the box
*November 10, 2010 by Ashley*

**math**

which has the greater area: a square with a side that measures 7 meters, or a 6-by-8 meter rectangle? what is the area?
*January 13, 2011 by tracy*

**milimeters question**

A box measures 24mm on a side. What is the volume of the box ? Help me with steps please?
*May 1, 2013 by Michael*

**pre algebra**

a fieldstone patio is in the shape of a square that measures 9 ft on each side what is the area of the patio
*June 23, 2013 by alonzo *

**Physics**

M, a solid cylinder (M=2.35 kg, R=0.111 m) pivots on a thin, fixed, frictionless bearing. A string wrapped around the cylinder pulls downward with a force F which equals the weight of a 0.750 kg mass, i.e., F = 7.357 N. 1)Calculate the angular acceleration of the cylinder. The...
*February 11, 2014 by Tomas*

**Forensic Psychology**

Using multiple sources, defend your thesis on how and why therapeutic and forensic roles can or cannot be reconciled. Ensure that you argue for a particular side of the issue (not arguing both sides) and that your argument is well-supported by scholarly literature, ...
*October 31, 2013 by debra*

**Chemistry**

Phase diagrams- Explain how the density of the solid and liquid phase would compare.
*January 16, 2008 by Lauren*

**Chem**

If the molar mass of monatomic deuterium (D) is 2.0141 g, then what is the density of diatomic deuterium (D2) gas at 25.0°C and 1.00 atm? I know the equation for density is: d=m/v What equation(s) do I need to use to solve this?
*April 19, 2008 by Ginger*

**physics**

A block of mass 200g and density 0.8g/cm3 is submerged in a liquid of density 0.2g/cm3. find minimum force required to keep the block floating.
*February 11, 2012 by Narayanan*

**Chemistry **

What is the mass, in grams, of a pure iron cube that has a volume of 4.30 cm3?
*February 2, 2015 by Samantha*

**algebra**

27a squared b cube - 36a cube b squared + 18 a squared b squared + 9 a to the 4th b cube
*August 22, 2011 by Anonymous*

**Chemistry**

An element has hcp packing with a hexagonal unit cell. Its density is 4.5 g/cm3 and the unit cell volume is 3.53 x 10-23 mL. Calculate the molar mass (g/mol) of the element to three significant figures.
*May 13, 2009 by Linda*

**chemistry**

An element has hcp packing with a hexagonal unit cell. Its density is 21000 kg/m3 and the unit cell volume is 2.94 x 10-23 mL. Calculate the molar mass (g/mol) of the element to three significant figures.
*February 9, 2010 by Luc*

**chemistry 1046**

A.Determine the pH of the solution. a solution that is 1.17% HCl by mass (Assume a density of 1.01 g/mL for the solution.) B. Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 279 mg/L.
*July 3, 2012 by Anonymous*

**chemistry**

an aluminum cylinder is 10.0 cm in length and has a radius of .25 cm. if the mass of a single atom of aluminum is 4.48X10^-23 calculate the number of aluminum atoms present in the cylinder. the density of aluminum is 2.70 g/cm^3 Please answer quickly.
*September 7, 2012 by Krista*

**college chem**

metallic iron crystallizes in a cubic lattice. The unit cell edge length is 287 pm. The density of iron is 7.87 g/cm^3. Calculate the mass (in grams) of one unit cell
*February 4, 2013 by luis fernandez*

**Science**

A stone with a mass of 225.0g is placed into a graduated cylinder with a starting volume of 200.0ml. If the water in the cylinder is displaced to 225.0 ml, calculate the volume of the rock and its density.
*October 8, 2013 by Bianca*

**CHEM**

Calculate the density of oxygen, , under each of the following conditions: STP 1.00atm and 25.0 degrees celsius Express your answers numerically in grams per liter. Enter the density at STP first and separate your answers by a comma.
*October 24, 2008 by Kara*

**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*

**Maths 132**

Find the volume of the solid lying in side both the sphere bounded x^2+y^2+z^2=4a^2 and the cylinder x^2+y^2=2ay
*June 25, 2011 by Bir*

**chemistry**

What is the mass/vol % ethanol in an ethanol-water solution with density of 0.875 g/ml and containing 65.0% ethanol by volume? The density of pure ethanol is 0.789 g/ml.
*June 27, 2010 by jimbo*

**physics**

a block off wood (density = 0.5 g/cm^3) is floating in oil (density = 0.75 g/cm^3). The mass of the wood is 1500 g. Determine the volume of the oil displaced
*December 2, 2011 by steph*

**Chemistry/physics**

i have a density of 1.9x 10 (negative cubed)g/cm cubed.and i have a mass of 50.0 g. do i need to convert my density in order to find my volume?
*February 20, 2013 by Armoured sheperd*

**physics**

The volume of a neutron is about 10−45 cubic meters. Suppose you packed the number of neutrons you found for problem 4 into a cube so that the neutrons touched edge to edge. How big would the cube be? (Hint: Problem 4 states that a neutron star has a mass of 3.4×1030 kg ...
*November 27, 2011 by Anonymous*

**Cemistry**

A solution is 36% silver nitrate (AgNO3) by mass. The density of this solution is 1.44 g/mL. The formula weight of AgNO3 is 170 g/mol. Calculate the molality of AgNO3 in this solution.
*June 9, 2010 by Swagato*

**Science **

A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15 g D. 17 g E. 32 g Is...
*November 6, 2014 by Callie*

**Science HELP**

A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15 g D. 17 g E. 32 g Is...
*November 6, 2014 by Callie*

**Chemistry**

A 2.28 m solution of the solute formic acid dissolved in the solvent H2O is available. Calculate the mass ( kg ) of the solution that must be taken to obtain 12.40 mol of formic acid. Correct Answer = 6.01 Molar Mass (g/mol): HCO2H 46.03 H2O 18.015 Density ( g/mL ): HCO2H 1....
*June 6, 2010 by Fred*

**chemistry**

NH4NO3(s) NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction above, 1.07 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid dissolves) is 22.4°C. ...
*November 16, 2012 by DeeDee*

**math/algebra**

I have a triangle one side = 3 side 2 = square root5 - square root 3 side 3 = square root 5 + square root 3 I can get the answer 3 and I know I am missing the square root part of the equation can you help me by showing how this problem is worked so I can see where I am missing...
*July 22, 2007 by Dee*

**geometry**

a pyramid has a square base that measures 3 feet on each side. the height of the pyramid is 19 inches. what is the volume?
*September 27, 2010 by margo*

**Geometry**

Tell if the measures 9,11, and 7 can be side lengths of a triangle. if so, classify the triangle as acute, right, or obtuse?
*July 21, 2011 by Lydia*

**Geometry**

What is the volume of a regular pyramid if it has a square base, one side of the base measures 4 cm, and the altitude is 5 cm?
*July 31, 2011 by Brianna*

**math**

mark wants to enlarge a 4" by 6" photograph so that the longest side measures 15" how wide will he need to make the photograph
*May 9, 2012 by american fork jr*

**geometry**

A regular pentagonal pyramid has a side length of 4 mm, an apothem that measures 3 mm, and a height of 4.1 mm. What is the volume of the pyramid?
*November 2, 2012 by Jade*

**physics**

What is the density of a solid 1.5 kg paperweight that gets submerged in water and displaces 150 cm3 of water
*May 8, 2010 by Jessica *

**MaTh**

A square game board measures 16 inches on each side. The game board is divided into smaller squares measuring 2 inches on a side. How many small squares are there on the game board? My answer is 16x16 = 256 x 2=512, then I 16/2 = 8 and 512/8 = 64. Is this correct if so is ...
*August 8, 2013 by Amy*

**physics lab**

For a physics lab, I measured length, width, thickness, and mass of 2 blocks of wood, 3 trials each. There were 2 questions on the lab that I did not understand how to do. 1. For each trial, find the ratio between the mass and the volume. Based on your data, what is the ...
*September 1, 2006 by anonymous*

**Chemistry**

Calculate the density of sulfur trioxide gas at 35 degrees celsius and 715 torr pressure. I know that d=m/v = PM/RT. Im not sure how to set this up. I know the molar mass of sulfur trioxide is 80.0642 but im not sure if I need to use that.
*January 11, 2012 by Hannah*

**chemistry**

Assume the density of aqueous HCl is the same as water (1.0 g/mL) and use the densities of ethanol (0.789 g/mL) and water as well as the actual amount of recrystallization solvent used to calculate the mass of recrystallization solvent.
*February 12, 2012 by Mike*

**INTRO TO PHYSICS**

Each of the following objects has a radius of 0.174 m and a mass of 2.16 kg, and each rotates about an axis through its center (as in the table below) with an angular speed of 37.3 rad/s. Find the magnitude of the angular momentum of each object. >Hoop of thin cylindrical ...
*October 31, 2012 by Sandy*

**Math**

Mr Shen wished to enter the orange kite competition with an innovative kite of his own design. He did tests that showed an irregular quadrilateral design was best. The longest side (A) was twice the length of the shortest side (C). Side B was one and one-half times the ...
*May 5, 2014 by Christopher*

**chemistry**

The density of a 60% (m/m) ethanol solution 0.8937g/ml , calculate the molarity of the solution , step by step . Molar mass of ethanol = 46.07
*July 29, 2013 by kaksha*

**Chemistry**

Calculate the enthalpy change for the melting of a 30 g ice cube. Show all your steps. Any help is appreciated! :)
*November 10, 2008 by anonymous*

**chemistry**

calculate the volume of Nitrogen gas to produce 5.6 dm cube of nitric oxide at STP ,N2 + O2 = 2NO
*February 20, 2013 by rupal*

**physics**

One mole of titanium (6 1023 atoms) has a mass of 48 grams, and its density is 4.54 grams per cubic centimeter, so the center-to-center distance between atoms is 2.60 10-10 m. You have a long thin bar of titanium, 2.4 m long, with a square cross section, 0.11 cm on a side. You...
*June 26, 2014 by hannah*

**Chemistry**

I have a solution made up of 100 ml of distilled water and 2.0g of NaOH. I need to determine the total volumeof the solution in order to the calculate the mass of the reaction mixture. How do I do this? We are to assume the density of the solution is the same as pure water, 1....
*April 28, 2010 by Jim*

**chem**

As little as 1.oomg of Arsenic in 1-L of water can kill you. Calculate the following. Assume the density of the solution is 1.00g/cc. a.) How many moles of arsenic in 1 mg? b.) What is the mass percent of the solution? c.) What is the concentration in ppm and ppb? d.) What is ...
*December 8, 2012 by Tricia*

**physics**

The Moon can be considered to be a sphere with uniform density with mass MM and radius RM. At the (exact) center of the Moon, the gravitational force on a mass m due to the mass of the Moon is? I know the answer is zero but want to know why using gauss' law
*July 9, 2012 by lanre*

**Last Question Plz helppp:((im soo sleepy!!:(**

1)The reaction between solid sodium and iron(III) oxide, Fe2O3(s), is one in a series of reactions that occurs when an automobile air bag inflates. 6Na(s) + Fe2O3(s) -> 3Na2o(s) + 2Fe(s) If 100.0 g of iron(III) oxide are used in this reaction, what mass of solid iron will ...
*December 19, 2012 by Nikki*

**CHEM-HELP!!!!**

help? how do i calculate the heat of formation of a solid? i only know how to find the heat of formation of a liquid. here's what i have so far. delta t= 16.8 degrees c mass= 33.136 g cp = 4.184 j/g degrees c m cp delta t = -2329J (process is exothermic) what do i do now?
*October 24, 2007 by Jake*

**Chemistry**

I know how to find a and b on this problem but how do I find c? Really would appreciate the help, thanks! The formula of a compound of iron and sulfur was determined using the method of mass measurements. A sample of iron was weighed into a crucible and covered with finely ...
*February 21, 2010 by Jenny*

**Algebra**

A large cube is formed by using many small 1"x1"x1" cubes. Once the large cube is formed, all the outside faces are painted. There are now exactly 27 small cubes that do NOT have any paint on any face. How many 1"x1"x1" cubes were used to form the large cube?
*February 25, 2013 by Kevin*

**Physics **

A light string is attached to both a hanging mass m1 = 5 kg and to a pulley of mass m2= 6 kg, and radius R = 0.75 m. If the pulley is a solid disc rotating about its center with a moment of inertia of I = 0.5*m2R2, and the string does not slip on the pulley, (a) what is the ...
*February 8, 2015 by Anonymous*

**science**

I see others have asked the same question but I do not understand the answers given. Question is to do with zinc solid and dilute sulphuric acid. What substance is left? I see by other posts that Bob Pursley answered this question. I haven't seen his answer but here is a hint...
*October 15, 2006 by teddy*

**chemistry help**

this isnt exactly a chemistry question, but i am doing chemistry homework with my calculator. and i want to know if someone can tell me how can i cube something with this calculator? TI-30X IIS? i wanted to post a pic but i cant post sites. i have this calculator can you tell ...
*November 28, 2010 by jessie*

**algebra 2**

need help with The Chin's family room measures 24 ft by 30 ft. they are covering a floor with square tiles that measure 1 foot on a side and cost $0.73 how much will they spend on tile?
*April 30, 2013 by bernie*

**chemistry**

I need help with Part 2 Part 1. Record the following for each of the three experiments: (a) Mass of the empty calorimeter (g): 11.600 g (b) Initial temperature in the calorimeter (C): 21.00 (c) Maximum temperature in the calorimeter from the reaction (C): 29.27, 34.78, 40.29 (...
*May 7, 2010 by Amanda*

**Chemistry**

Describe how to prepare 5.00 liters of a 5.00 % (w/w) NaCl solution, which has a density of 1.06 g/mL, from pure solid sodium chloride. I have no idea how to find the starting measurements please help!
*February 6, 2011 by Anon*

**Math**

The tree faces of a rectangular solid have areas 6,10, and 15. If the dimensions of the rectangular solid are all integers, what is the volume of the solid?
*August 13, 2013 by Anonymous*

**chemistry**

A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml volumetric flask and diluted to the mark. It was found that 38.5 ml of this diluted solution was needed to react the stoichimetric point in a titration of 10.0 mL of a phosphoric acid, H3PO4, solution. The ...
*June 20, 2009 by dan*

**Chemistry**

Calculate the freezing point depression and osmotic pressure at 25 degrees C of an aqueous solution of 1.0 g/L of a protein (mol wt= 90,000) if the density of the solution is 1.0 g/mL. I know how to calculate freezing point depression and osmotic pressure, but I'm having ...
*March 24, 2007 by Jessica*

**physicss please help**

Calculate the terminal velocity for a baseball. A baseball's diameter is approximately d = 0.073 m, and its mass is m = 0.146 kg. Express your answer in meters per second and miles per hour. (Assume a drag coefficient of 1 and air density of 1.3 kg/m3.) __ m/s __ mph
*February 14, 2009 by kj*

**chemistry**

Calculate the volume of fuel needed for a flight if the jet fuel has a density of 0.803kg/L.First use dimensional analysis to convert liter to grams.Then substract to find how many kilograms need to be added.then convert this mass into liters
*September 9, 2014 by treasa*

**physics**

Two boxes sit side-by-side on a smooth horizontal surface. The lighter box has a mass of 5.18 kg, the heavier box has a mass of 7.51 kg. (a) Find the contact force between these boxes when a horizontal force of 3.9 N is applied to the light box.
*September 26, 2011 by jeff*

**algebra**

the perimeter of a triangle is 205. one side is 10 longer than the shortest side. the third side is 5 less than twice the shortest side.how long is each side
*February 28, 2011 by tana*

**chemistry**

a room is 18ft long, 15ft wide and from floor to ceiling is 8ft6inches. what is the rooms volume in cubic meters? i have 6.498716 is this correct? what is the mass of air in the room in kilograms assuming the density of the air is 1.2g/l and the room is empty of furniture. i ...
*October 3, 2011 by cheryl*

**algebra**

The ratio of the measures of three sides of a triangle are 1/2:1/3:1/5, and its perimeter is 6.2 centimeters. find the measure of each side of the triangle
*January 23, 2009 by chargersmath*

**5th grade**

the lengths of two sides of a triangle are 15in.each.the third side measures 10 in.what type of triangle is this
*December 2, 2010 by Anonymous*

**physics**

The density of liquid carbon dioxide is about 0.8 g/cm^3. What volume fraction inside the fire extinguisher (when it is full) is occupied by liquid CO2? The density of CO2 gas is negligible compared to the density of liquid CO2. Volume of fire extinguisher is 7.1*10^-3m^3; ...
*December 24, 2013 by Alice*

**G.N.M.P.S**

A solid weighs 1000g in air , 75g in water, and 70g in oil. Calculates the relative density of oil ?
*March 8, 2014 by shakshi*

**8th grade**

Please help me how you get the answer. PLEASE I NEED HELP. A triangle sail has a perimeter of 25 m. Side a is 2 m shorter than twice side b, and side c is 3 m longer than side b. Find the length of each side. Thank you ver much for helping me
*October 27, 2010 by Glenda*

**physics**

1) Two boxes are placed are placed side by side on a frictionless surface so that they touch each other. Box A has a mass of 4 kg. Box B has a mass of 12 kg. A constant force of 24 N is applied to box A. What force does box A exert on box B?
*November 10, 2009 by pat*

**Physics**

A cable passes over a pulley. Because of friction, the tension in the cable is not eh same on opposite side of the pulley. The force in one side is 110 N, and the force on the other side is 100 N. Assume that the pulley is a uniform disk of mass 2.1kg and radius 0.21. ...
*October 15, 2010 by Rod*

**Chemistry**

An element has ccp packing with a face-centered cubic unit cell. Its density is 8.92 g/cm3 and the unit cell volume is 4.72 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures.
*May 16, 2009 by Kristina*

**Chemistry**

An element has ccp packing with a face-centered cubic unit cell. Its density is 8.92 g/cm3 and the unit cell volume is 4.72 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures.
*May 16, 2009 by Kristina*

**chemistry**

An element has ccp packing with a face-centered cubic unit cell. Its density is 1770 kg/m3 and the unit cell volume is 1.50 x 10-28 m3. Calculate the molar mass (g/mol) of the element to three significant figures.
*January 20, 2012 by Crystal*

**Calculus III**

Find the moment of inertia about a diameter of s spherical shell of uniform density, D, bounded by two concentric spheres of radii a and b, where a<b. Express your answer in terms of a, b and the mass of the spherical shell. So far I have found my equation for row (p), and ...
*August 4, 2014 by E*

**chemistry**

What mass of solid sodium acetate, NaCH3COO, must be added to 2.50 L of an aqueous solution of 0.55 M acetic acid, CH3COOH, in order to make a buffer solution whose pH is 4.50 ? Assume that adding the solid does not change the volume of the solution. Use the simultaneous ...
*December 6, 2014 by airman*

**Physics**

A 6-g ice cube at −8°C is dropped into 70 g of water at 31°C. (a) After enough time has passed to allow the ice cube and water to come into equilibrium, what is the temperature of the water? (b) If a second ice cube is added, what will the temperature be?
*July 20, 2012 by Vladimir*

**Math**

Use differential, (i.e. linear approximation), to approximate cube root of 64.1 as follows: Let f(x) = cube root of x. The linear approximation to f(x) at x = 64 can be written in the form y = mx+b. Compute m and b and find cube root of 64.2 via linear approximation
*December 19, 2014 by Anonymous*

**Chemistry**

A tetrahedral site in a close-packed lattice is formed by four spheres at the corners of a regular tetrahedron. This is equivalent to placing the spheres at alternate corners of a cube. In such a close-packed arrangement the spheres are in contact and if the spheres have a ...
*February 6, 2015 by Mike*

**Chemistry**

A tetrahedral site in a close-packed lattice is formed by four spheres at the corners of a regular tetrahedron. This is equivalent to placing the spheres at alternate corners of a cube. In such a close-packed arrangement the spheres are in contact and if the spheres have a ...
*February 6, 2015 by Mike*

**Math**

Nathan is designing a box to keep his pet newt in. To make the box, he’s going to start with a solid rectangle and cut squares with sides x cm in length from each corner, as shown in the picture below. The dimensions of the of the solid rectangle are 51 cm by 45 cm. The volume...
*October 30, 2014 by Matt*

**Chemistry**

An ice cube at 0 degrees Celsius was dropped into 30.0 g of water in a cup at 45.0 degrees Celsius. At the instant that all of the ice was melted, the temperature of the water i the cup was 19.5 degrees Celsius. What was the mass of the ice cube?
*April 21, 2010 by Scoob*

**Chemistry**

An ice cube at 0 degrees Celsius was dropped into 30.0g of water in a cup at 45 degrees Celsius. At the instant that all of the ice was melted, the temperature of the water in the cup was 19.5 degrees Celsius. What was the mass of the ice cube?
*April 23, 2010 by Help1001*

**Chem-Lab-HELP!!**

Heating 1.124g of an unknown NaHCO3-NaCl mixture resulted ina mass loss of 0.270g. 1) Calculate the mass of NaHCO3 present in the original mixture. 2) Calculate the mass percent of NaHCO3 in the uknown mixture
*February 17, 2010 by Macey*

**chemistry**

ohh im sorry i also have another problem i don't understand. "A rectangular solid measures 1.0 m by 5.6 cm by 2.1 dm. Express its volume in cubic meters, liters, cubic inches, and cubic feet." i don't even know what dm means ! Someoneee please help me!
*July 21, 2008 by Jecce*

**Science**

what happens when we apply force below the centre of mass of a cube ? Will it tip?
*October 1, 2012 by suman*

**chemistry**

What is the mass of 1120cm cube of hydrogen gas at 750mmHg and 40 degree celsius
*October 4, 2012 by Femi*

**chemistry**

Calculate the number of grams of reactant left over when 28.35 grams of silver reacts with 50.0 liters of air at STP which is 20.9476 % oxygen by volume. The density of air at STP is 1.292 g/L. attemtp at solution volume of oxygen= .209476*50L=10.5L How do i go from volume of ...
*November 8, 2008 by jason*

**chemistry**

A student measures the mass of a book as 12,321g. What is the book's mass in kg?
*August 23, 2007 by Rachael*

**geometry**

The rectangle ABCD is rotated about the side AB. Find the volume of the solid defined by this rotation. AB = DC = 4cm AD = CB = 2cm
*January 9, 2011 by peter*

**chem HELP PLEASE its physics side of chem **

given E, = l^2 h^2 / 2 m r^2 calculate energies for an electron localised to a circle of radius 2 x 10^-9 m for l = 0,1,2, draw pictures of three levels and calculate the relative populations of these levels at 300K i did the first bit but came out with, 0, 6.0249 x 10-6 J mol...
*October 27, 2009 by poppy*

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