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March 8, 2014

# Search: If each atom has a radius of 1.43 , what is the length of a side of the unit cell?

Number of results: 30,688

chemistry
Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each Al atom has a radius of 1.43 angstroms, what is the length of a side of the unit cell?
Tuesday, October 20, 2009 at 12:23pm by allie

drawing
Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each atom has a radius of 1.43 , what is the length of a side of the unit cell?
Wednesday, July 21, 2010 at 12:12am by Anonymous

chemistry
The radius of an atom is about 10,000 times as large as its nucleus. If the atom were enlarged such that the radius of its nucleus was 1 inch, what would be the radius of the atom in meters? I need the formula to follow so that I can solve this problem.
Thursday, December 1, 2011 at 12:45am by george

algebra
the width of a rectangle is 3 less than twice the length of x. if area of rectangle is 43 in sq ft. which equation can be used to find length in feet a. 2x(x-3)=43 b.2x+2(2x-3)=43 c.x(3-2x)=43 d.x(2x-3)=43
Friday, March 29, 2013 at 6:50pm by Anonymous

Geometry
Triangle ABC, angle A = 55 deg side b = 43 tan A = op/adj = a/b = a/43 tan 55 = a/43 a = 43 * 1.4281 a = 61.4083 cos 55 = adj/hyp = b/c = 43/c cos 55 = 43/c c = 43/0.5736 c = 74.9651 I'll let you finish (not sure what 'length of triangle' is) Length of triangle = ?
Monday, February 14, 2011 at 9:41pm by helper

chemistry
The edge length is 502 pm (convert to cm), then a*(3)1/2 = 4r where r is the radius of the atom. The volume of the atom is V = (4/3)*pi*r3
Tuesday, May 18, 2010 at 3:59pm by DrBob222

chemistry
I may have missed something here but if the radius of the atom is 10,000 times the radius of the nucleus, then if the radius of the nucleus is 1", then the radius of the atom is 10,000". Convert that to meters.
Thursday, December 1, 2011 at 12:45am by DrBob222

chemistry
Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube is 362 pm. What is the radius of a gallium atom? The face-centered gold crystal has an edge length of 407 pm. Based on the unit cell, calculate the density of gold. Type of atom Fraction in...
Monday, November 24, 2008 at 3:15pm by ea

Why does the He atom have a smaller radius than th
(a) Why does the He atom have a smaller radius than the H atom? (b) Why is the He atom smaller than the Ne atom?
Tuesday, August 17, 2010 at 5:23pm by gabyj

math helllllllllllpppp plzzzzzzzzzzzzzzzzzzzzzzz
43^0 = 1 or 01 43^1 = 43 43^2 = 1849 43^3 = 79507 43^4 = 3418801 43^5 = 147008443 43^6 = ......049 43^7 = ..... 07 43^8 = ..... 01 43^9 = ..... 43 ahhh, can you see how the end repeats ? ending: 43 49 07 01 43 repeats after 4 numbers 2082/4 = 520 and remainder of 1 and behaves...
Tuesday, May 14, 2013 at 2:16pm by Reiny

physics
In Bohr's model of the hydrogen atom, the radius of an orbit a. is proportional to n2. b. is smallest for the highest energy state. c. increases when a photon of light is emitted from an excited atom. d. can have any value that is larger than the ground-state radius. e. none ...
Saturday, August 15, 2009 at 12:46pm by jeff

I think this is playing with the body centered cubic model. The body diagonal has a length that is four times the radius of the atom, R. The relationship between a (the length of the side) and R can be worked out by the Pythagorean theorem: (4 R)^2 = 3 a^2 Only need to set up ...
Monday, October 27, 2008 at 11:01pm by Dr Russ

Chemistry
Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 (femtometers) and the radius of the atom is approximately 70 (picometers). The volume of the nucleus is 8.2×10^−8 pm^3 And the volume of the atom is 1.4×10^6 pm^3 I found the ...
Wednesday, August 31, 2011 at 7:06pm by Brittany

PHYSICS
how to calculate formula for period of a cylinder that depends on radius(cm), length(cm) and time(sec). If a radius is 3.84 and at length(30)=.83sec length(100)=3.31sec length(200cm)=6.04sec
Sunday, May 18, 2008 at 8:41pm by josh

Unit Cells
I don't get the 47.453 A^3 for volume. That seems far too large (of course that depends upon what A stands for). Whatever the volume, then V1/3 = length of an edge of the unit cell = a. Then 4r = a(21/2). When you have found r (radius of the atom), then volume of the atom = (4...
Sunday, May 9, 2010 at 11:00pm by DrBob222

Chemistry
A helium atom has a smaller atomic radius than the hydrogen atom. Explain why.
Thursday, November 21, 2013 at 12:37am by tstephens

Chemistry
Which has a larger radius, the oxygen atom (O) or oxygen ion (O-2) ? Explain. Isn't the ion bigger because negative ions are bigger than atom's radius. im not sure though.
Saturday, October 23, 2010 at 4:56pm by Sheryl

calculus
A potter forms a piece of clay into a cylinder. As he rolls it, the length,L, of the cylinder increases and the radius, r, decreases. If the length of the cylinder is increasing at .1 cm per second, find the rate at which the radius is changing when the radius is 1 cm. and the...
Wednesday, February 3, 2010 at 9:55pm by mandy

geometry
the arc length of AB is 2^pi ft. find the radius of the circle ABC=43 degree. round your answer to the nearest hundredth.
Monday, June 25, 2012 at 6:35pm by Nancy

Physics
Can someone help me with this, i have started it but cant get it to work out. The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n2, where n=1 labels the lowest, or “ground” state, n=3 is ...
Saturday, November 10, 2007 at 7:45am by Aaron

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

physics
An ionized helium atom has a mass of 6.6*10^-27kg and a speed of 4.4*10^5 m/s. The atom moves perpendicular to a 0.75-T magnetic field on a circular path of radius 0.012m. Determine whether the charge of the ionized helium atom is +e or +2e. Can anyone please give me some ...
Tuesday, April 1, 2008 at 2:52pm by Kelly

Chemistry
so you have an atom at each corner. Draw a line thru corner to corner along the diagnol. One atom in the center of the face. So the length of the line is 4radii. So the edge of the cell must be .707*4 radii. You can get the radii from the periodic table. Your teacher might ...
Sunday, February 21, 2010 at 8:09pm by bobpursley

physics
The diameter of a hydrogen atom is 1.06*10^-10m Scale that diameter up to 3.74cm: 3.74*10^-2/1.06*10^-10 = 3.53*10^8m so, the radius would be 1.76*10^5km, or about 43% of the way to the moon.
Friday, September 7, 2012 at 3:17am by Steve

Pre-Cal
Tan 43.2 = Opposite/12.6 Tan 43.2 x 12.6 = Length of opposite side Length of shorter side = 11.83cm
Tuesday, January 29, 2008 at 5:16pm by Creating a formula from 2 variables

Physics
A doubly charged helium atom (mass = 6.68 x 10-27 kg) is accelerated through a potential difference of 3.00x 103 V. What will be the radius of curvature of the path of the atom if it is in a uniform 0.410 T magnetic field?
Monday, December 1, 2008 at 2:35pm by Brynlie

English/Math
It means, on a circle, find the length of the arc at the end of a radius, rotated thru some angle. Of course, you know the length if it is a complete circle as 2PI*radius.
Thursday, March 22, 2012 at 4:06pm by bobpursley

MATHS
What is Radius if Angle at centre is 150 and Arc length is 220 What is radius if Angle at centre is 270 and Area is 1848 What are area and Angle at circle if Radius is 14 and Arc length is 55 What is radius if Angle at centre is 75 and Area is 154
Saturday, February 27, 2010 at 2:59am by ARKI

chemistry
Assume that the entire mass of an atom is concentrated in its nucleus, a sphere of a radius 1.5 x 10 to the -5 pm. If the mass of the atom is 2.39 x 10 to the -22 g, what is the density?
Monday, September 29, 2008 at 9:41pm by andrew

CHEM****
Initial info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube. Atoms can also be found...
Friday, November 30, 2007 at 1:36am by K

Chemistry
Bond length is from center of atom to center of atom.
Sunday, December 14, 2008 at 6:51pm by bobpursley

Chemistry
Why, in terms of atomic structure, is the radius of an Na atom larger than the radius of an Na+ ion?
Saturday, November 20, 2010 at 2:12pm by danny123

Math rem
2.Find the length of the arc in a circle if the radius of the circle is 24cm and the degree of the arc is 90o 3.Find the length of the arc if a circle if the degree if the arc is 120o and the length of the radius is 8cm. 4. A circle has a radius of 7. Find the diameter (D) and...
Monday, February 11, 2013 at 10:53am by bs

CHEM**
Decreasing atomic radius means, to me, that we list the lagest radius first and the smallest radius last. That is the way they are listed above which is what the problem asked for. I don't understand why decreasing atomic radius and decreasing atomic size are not the same, at ...
Tuesday, November 13, 2007 at 8:04pm by DrBob222

Science
What is the radius in nm of the electron orbit of a hydrogen atom for n=3? What is the radius in nm of the electron orbit of a hydrogen atom for n=4?
Tuesday, January 14, 2014 at 7:44pm by Katie

CHEM
Info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube. Atoms can also be found in the ...
Thursday, November 29, 2007 at 12:25am by K

precalculus
The question is...find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s. Then it gives the radius r of 27 inches and an arc length s of 6 inches. How do I do that?
Sunday, February 28, 2010 at 3:24pm by Megan

Trig
Find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s.? Radius, r=16 ft Arc length, s=10 ft
Friday, May 18, 2012 at 12:51pm by Sue

Phy 231
A baton consists of a nearly massless rod of length L and two spheres attached to the end of the rod, whose masses are each M and whose centers are separated by L. The spheres have radius R. If the sphere radius R is not negligible compared to the length L, what is the moment ...
Tuesday, July 31, 2012 at 10:40am by Sally

Science
Atom building game board has 17 protons, 18 neutrons, and 18 electrons. *What is the atom that's represented on the game board. *What is the total charge on this atom? *What is the mass # of this atom? *What do you call an atom that different #'s of protons and neutrons? *What...
Friday, September 21, 2007 at 8:51pm by Sonic

Math
For a circle of radius r, the arc length of central angle θ is given by rθ. For a circle of unit radius (i.e. radius=1), r=1, therefore the arc length equals the central angle. I hope this confirms what you were enquiring.
Sunday, October 10, 2010 at 7:45pm by MathMate

AP Chem
c.) The NO2 -1 ion exhibits resonance, giving bonds of equal length, but in HNO2, the bonding of the H atom fixes one oxygen atom’s bond to N as a single bond. The other oxygen atom is bonded to the nitrogen with a double bond. There is no resonance in HNO2. d) The central ...
Tuesday, January 9, 2007 at 3:36pm by asdfghjk

College Physics
Ok, the radius of rotation is length*sin30 where length is the length of string. looking at vectors, mg is down, and mv^2/r is outward, so tan30=mv^2/(r*mg) tan 30= v^2/(length*sin30*g) but v= 2PI(length*sin30) square that, put it in the equation tan30=4PI^2*length*sin30/g ...
Wednesday, November 10, 2010 at 1:47pm by bobpursley

physics
A water molecule consists of an oxygen atom with two hydrogen atoms bound to it. The bonds are .100nm in length and the angle between the two bonds is 106 degrees. Use the x-y axis shown and determine the location of the center of gracity of molecule. Consider the mass of an ...
Thursday, January 25, 2007 at 4:23pm by cyndi

Chemistry
An estimation of the radius of a lead atom: a. You are given a cube of lead that is 1.000 em on each side. The density of lead is 11.35 g/cm3. How many atoms of lead are contained in the sample. b. Atoms are spherical; therefore, the lead atoms in this sample cannot fill all ...
Sunday, November 13, 2011 at 8:57pm by Arnol

Science
Hello van some one show me how to draw a dot and cross diagramm for 1 lithium atom and 1 fluorine atom(Lif) and also a diagram for 1 magnesium atom and 1 oxygen atom (MgO) Thankyou Paul.
Monday, March 28, 2011 at 4:07am by Paul

chemistry
Determine the radius of the largest atom that can be accommodated in the interstices of BCC iron (Fe) without stress. (Hint: the center of the largest site is at ½, ¼, 0; draw a unit cell - it helps.) Radius (in centimeters):
Tuesday, April 2, 2013 at 11:41pm by adex

Math
The area of a rectangle is shown below The area of the rectangle is 56 Which of the following are possible values for the length and width of the rectangle? A.length=6cm and width=9cm B.length=7cm and width=8cm C.length=14cm and width=14cm D.Length=28cm and width=28cm B? What ...
Wednesday, March 6, 2013 at 6:35pm by Jerald

Physics
Is the trend for ionic radius just that for metals, they are smaller than the nuetral atom and for non-metals, and for non-metals, they are bigger than the neutral atom? Or is there another specific trend?
Saturday, February 26, 2011 at 2:33pm by Emily-Help Please!

Physics
Is the trend for ionic radius just that for metals, they are smaller than the nuetral atom and for non-metals, and for non-metals, they are bigger than the neutral atom? Or is there another specific trend?
Saturday, February 26, 2011 at 12:34pm by Emily

AP Chemistry--correction
I quoted radius above that obtained 2.86 x 10^-8 but that isn't what I found. I found radius of the iron atom to be 1.24 x 10^-8 cm.
Saturday, November 14, 2009 at 11:50am by DrBob222

AP chem
Second question: In the LiCl structure shown in 9.18 [LiCl's lattice, where the "Cl- ions are in contact with each other, forming a face centered cubic lattice."], the chloride ions form a face-centered cubic unit cell 0.513 nm on an edge. The ionic radius of Cl- is 0.181 nm. ...
Thursday, December 7, 2006 at 6:17pm by chris

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.
Friday, September 7, 2012 at 9:32am by Krista

physics help pleease!!
Arc length = radius * angle (in radians) In this case, arc length equals length of rope, so L = r*θ = 6.3*4(2π) Can you take it from here?
Wednesday, January 5, 2011 at 5:12pm by MathMate

urgent Help .. Chemistry
If you assume that an atom is a hard sphere, you can estimate the average volume of space it occupies using basic geometry. Estimate the volume,V , of one sodium atom (Na) using its metallic radius of 186 pm . Express your answer in cubic picometers.
Sunday, November 9, 2008 at 1:05pm by robert

Physics
Momentum = m1V1-m2V2. Momentum = 0.241*1.53 - 0.321*2.49=-0.43 = 0.43 to the Left. m*V = 0.43. (0.241+0.321)V = 0.43 0.562V = 0.43 V = 0.765 m/s.
Monday, November 19, 2012 at 5:09pm by Henry

Chemistry
Which atom has the smallest valence p atomic orbital? -Carbon -Nitrogen -Sulfur Why? A. That atom has the highest electronegativity. B. That atom has the fewest number of electrons. C. That atom does not have electrons in p orbitals. D. The valence electrons for that atom have...
Thursday, April 19, 2012 at 7:24pm by Pooya

chemistry
All right, you've got the radius of an atom. Whenever you get a problem asking for the volume, density, etc. you assume the atom is a sphere. The diameter of a barium atom would then be: 217pm * 2 = 434pm Either convert 4.33mm to pm or 434pm to mm. I'll convert 4.33mm to pm: 4...
Sunday, September 25, 2011 at 1:23pm by Cadavz

physics
Until you get to the electron, no work needs to be done because there is no net charge on the atom. From the electron ball (R1 radius) in to the proton ball (R2 radius), there is a repulsive force of F = k/r^2 form (I am leaving the Coulomb law numbers for you to do) the work ...
Thursday, April 24, 2008 at 8:16pm by Damon

algebra & geometry
The length of an arc equals the radius times the angle in radians. That is because the number of radians in a circle is defined to be 2 pi. 54 x (1/9) = 6 Your second question is incomplete. You need to know the central angle and arc length to compute the radius. I assume that...
Sunday, December 9, 2012 at 12:12am by drwls

chemistry
The fcc has 4 atoms/unit cell. Mass of 1 atom Pt = 195.08/6.02 x 10^23. Mass of unit cell is 4 times that. Then m = volume x density. You know density and mass, calculate volume of unit cell. From volume = a3 you can calculate a (the length of the side). For a fcc unit cell, 4...
Friday, January 29, 2010 at 7:40am by DrBob222

Math
Does the line cut the circle in half? If so, it is a diameter. Otherwise it would be a radius. C = pi * d Or C = 2 * pi * r d represents length of diameter and r represents length of radius. Use 3.14 for pi.
Tuesday, April 9, 2013 at 8:49pm by rbowh

Chemistry
For each of the following, enter the number of covalent bonds that the atom can form: (A) One atom of carbon (B) One atom of sulfur (C) One atom of nitrogen with no net charge (D) One atom of nitrogen with positive net charge (E) One atom of oxygen with no net charge (F) One ...
Thursday, March 7, 2013 at 1:31am by qwerty

chemistry
the model of the atom that pictured the atom with electrons struck randomly throughtout the mass of the atom was called the
Wednesday, October 27, 2010 at 7:48pm by 000

chem
1. under what circumstances is the molecular geometry around a single central atom the same as the electron group geometry around the central atom? 2.If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded to the central atom ...
Monday, April 28, 2008 at 12:00am by natash

physics
A neon atom (m = 20.0 u) makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a 55.2° angle from its original direction and the unknown atom travels away at a 51.8° angle. What is the mass of the unknown atom? [Hint: ...
Thursday, October 20, 2011 at 11:30pm by kago

Chemistry
which atom has the least attraction for the electrons in a bond between that atom and an atom of hydrogen? (1) carbon (2)nitrogen (3)oxygen (4) fluorine
Wednesday, December 1, 2010 at 11:08pm by Anonymous

Zoology
electron H-atom C-atom Na-atom glucose molecule nucleotide mitochondria fungal cell heart tundra
Sunday, August 29, 2010 at 11:28am by Anonymous

physics
A steel section of the Alaskan pipeline had a length of 65.9 m and a temperature of 21.4 °C when it was installed. What is its change in length when the temperature drops to a frigid -43.3 °C?
Monday, November 25, 2013 at 1:43pm by Anonymous

chemistry
Molar Volume of Sodium If you assume that an atom is a hard sphere, you can estimate the average volume of space it occupies using basic geometry. Question Estimate the volume, V , of a sodium atom ( Na ) using its metallic radius of 186
Sunday, November 9, 2008 at 12:46am by unkname

CHEMISTRY
The factor that affects how easily an electron can be removed from an atom is the A. structure of the atom. B. size of the atom. C. temperature of the environment. D. surrounding atoms.
Wednesday, June 18, 2008 at 12:14pm by DELIA

Inorganic Chemistry
The atoms in barium metal are arranged in a body centered cubic unit cell. Calculate the radius of a barium atom in A if the density of barium is 3.50g/cm3. The atomic weight of barium is 137.34. The atoms in barium metal are arranged in a body centered cubic unit cell. ...
Sunday, October 15, 2006 at 7:55pm by Stephanie

algebra
easiest way: since the two lines are parallel, they will differ only in the constant. so let the new line by x + 4y = k but (7,9) lies on it so 7 + 4(9) = k k = 43 for an equation of x + 4y = 43 change to y = mx + b form 4y = -x + 43 y = (1/4)x + 43/4
Saturday, August 29, 2009 at 12:09am by Reiny

algebra
easiest way: since the two lines are parallel, they will differ only in the constant. so let the new line by x + 4y = k but (7,9) lies on it so 7 + 4(9) = k k = 43 for an equation of x + 4y = 43 change to y = mx + b form 4y = -x + 43 y = (1/4)x + 43/4
Saturday, August 29, 2009 at 12:09am by Reiny

science
Which statement best compares an atom to an ion? A.An ion is an atom that has lost its charge. B.An ion is an atom that has gained or lost protons. C.An ion is an atom that has gained or lost electrons. D.An ion is an atom that has a different number of neutrons.
Friday, January 24, 2014 at 11:43am by victoria

Physical Science
The factor that affects how easily an electron can be removed from an atom is the A. surrounding atoms. B. temperature of the environment. C. structure of the atom. D. size of the atom.
Friday, March 7, 2008 at 7:05pm by Anonymous

math
the length of a spoke is approximately equal to the radius of the wheel so find the radius using the formula 2πr = circumference
Wednesday, March 28, 2012 at 6:19pm by Reiny

chemistry
edge^3 = volume mass = volume x density fcc = 4atoms/unit cell so mass/4 = mass 1 atom 1 atom x 6.02E23 = atomic mass. 4*radius = edge*21/2</sup Post your work if you get stuck.
Sunday, December 4, 2011 at 9:49pm by DrBob222

Physics
Could someone help me with these questions. . . please 1. How does Rutherford’s model of the atom account for the back – scattering of alpha particles directed at the gold leaf 2. The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. ...
Monday, November 12, 2007 at 2:40pm by Mike

physics
why is radius of the bob added to length of the string to know the length of the pendulum.
Tuesday, June 1, 2010 at 5:53pm by taker

Pre-Calculus
Determine the derivative at the point (2,−43) on the curve given by f(x)=7−7x−9x^2. I know that the answer is -43, but I was wondering if it was just a coincidence that the derivative at the point (2,−43) is -43, or is there a reason why -43 is the same...
Saturday, October 19, 2013 at 10:37pm by Ann

Science
Suppose a large atom bonds with a small atom. Predict whether the properties of the new molecule will be the same as the large atom, the same as the small atom, or different from both atoms.
Wednesday, November 19, 2008 at 8:16pm by Amber

Science
Suppose a large atom bonds with a small atom. Predict whether the properties of the new molecule will be the same as the large atom, the same as the small atom, or different from both atoms.
Wednesday, November 19, 2008 at 8:16pm by Anonymous

Science
Suppose a large atom bonds with a small atom. Predict whether the properties of the new molecule will be the same as the large atom, the same as the small atom, or different from both atoms.
Wednesday, November 19, 2008 at 8:16pm by ivana

physics
The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n2, where n=1 labels the lowest, or “ground” state, n=3 is the third state, and so on. If the atom’s diameter is 1x10-10m in its lowest ...
Tuesday, November 6, 2007 at 10:29am by Will

HELP-PROBLEM SOLVING IN MATHEMATICS
a piece of wire of length 136(pai) is cut to form 8 circles. the radius of the circles differ from each other, in sequence, by 1 cm. a) find the radius,r b) find the number of complete circles that can be formed if the original length of the wire is 190(pai)
Saturday, October 15, 2011 at 5:28am by alya

Physics
The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n2, where n=1 labels the lowest or “ground” state, n=3 is the third state, and so on. If the atom’s diameter is 1x10-10m in its lowest ...
Thursday, July 1, 2010 at 2:16pm by Richard

geometry
Write an equation for each circle if the coordiantes of the center and length of the radius are a. center(-1,-5) radius = 2 units b. center(0,3) radius = 7 units c. center(-9,7) radius = 1/2 units
Sunday, April 29, 2012 at 12:04am by lindsay

chemisty problem help
Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 70 pm. Calculate the volume of the nucleus and the volume of the atom. What percentage of the carbon atom's volume is occupied by the nucleus? Can someone tell me how to do this? Volume= 4/...
Thursday, February 8, 2007 at 9:42pm by Tagen

math
the arc length and central angle of a circle are 10cm and 80degrees respectivly. what is the length of the radius?
Saturday, May 12, 2012 at 12:21am by celina

geometry
If point P is at the center of the circle, and the length of chord equals 12 inches, which is the length of the radius ?
Wednesday, May 16, 2012 at 1:50pm by Anonymous

Physics
B. d = 0.5a*t^2 = 2.27*8.43^2 = 161.3 m. C. V = a*t = 4.53*8.43 = 38.2 m/s. D. 3.62*8.43 = 30.5 m/s.
Friday, September 20, 2013 at 1:54am by Henry

ALGEBRA WORD PROBLEM! HELP!
And if a length of a rectangle is 3 more than twice the width and the are is 90 cm squared than what are the dimensions of the rectangle? The width of the rectangle is 43.5 and the length of the rectangle is 87. All together when you add it up it will make 90 cm squared. If ...
Tuesday, January 23, 2007 at 7:01pm by Judy

chemistry
SOMEONE CAN PLZ EXPLAIN IN DETAIL HOW TO SOLVE THIS PROBLEM..THNKS Molar Volume of Sodium If you assume that an atom is a hard sphere, you can estimate the average volume of space it occupies using basic geometry. Question Estimate the volume, V , of a sodium atom ( Na ) using...
Sunday, November 9, 2008 at 1:05pm by unkname

Zoology
Can you rank these from the smallest to the largest? Heart carbon atom sodium atom electron nucleotide tundra mitochondria glucose molecule fungal cell hydrogen atom
Sunday, August 29, 2010 at 11:28am by Marcus

Physics
A hydrogen atom is in its third excited state (n=4). Using Bohr theory of the atom calculate (a) the radius of the orbit, (b) the linear momentum of the electron, (c) the angular momentum of the electron (d) the kinetic energy (e) the potential energy, and (f) the total energy...
Saturday, April 28, 2012 at 3:27am by Chi

Algebra
1. Create the indicated algebraic expression. Use descriptive variables. The length of a rectangular lawn is 6 ft more than three times the width of the lawn. Express the length of the lawn in terms of the width. A. 3+w+6 B. 3(w+6) C. 6w+3 D. 3w+6 For 1 I thought it was B? 2. ...
Wednesday, January 16, 2013 at 10:32am by Krissy

Physics
The cubit is an ancient unit of length based on the distance between the elbow and the tip of the middle finger of the measurer. Assume that the distance ranged from 43 to 53 cm, and suppose that ancient drawings indicate that a cylindrical pillar was to have a length of 6.0 ...
Monday, February 4, 2013 at 5:20pm by Kdom

PreCalculus
Cone Problem Beginning with a circular piece of paper with a 4- inch radius, as shown in (a), cut out a sector with an arc of length x. Join the two radial edges of the remaining portion of the paper to form a cone with radius r and height h, as shown in (b). What length of ...
Saturday, January 1, 2011 at 8:21pm by Emma

Math
Cone Problem Beginning with a circular piece of paper with a 4- inch radius, as shown in (a), cut out a sector with an arc of length x. Join the two radial edges of the remaining portion of the paper to form a cone with radius r and height h, as shown in (b). What length of ...
Sunday, January 2, 2011 at 2:28pm by Taylor

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