Friday

January 30, 2015

January 30, 2015

Number of results: 66,197

**Physics**

Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!
*June 8, 2010 by Amal*

**Physics**

Here, I am dealing with a Science formula for momentum. The formula is: M= mv So, I have: m= 10 grams (.01 Kilograms) v= 5,000 centimeters a second (50 m/s) It says to Find M and also solve the formula for M. Please help!
*June 8, 2010 by Amal*

**Chemistry**

the formula H2O2 is an example of 1.molecular formula 2. an empirical formula 3.an ionic formula 4.an organic formula
*November 28, 2010 by tia*

**Check my physics**

Would you mind checking one of my problems from my physics study guide? I know the answer and just want to make sure I am using the right formula. :) A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. a. Determine the kinetic energy possessed by ...
*March 7, 2013 by Anna *

**algebra**

how would i work out the following problems solve each formula in terms of the given variable 1. 5d-2g=9 ;g The formula A=2h(l+w) gives the lateral area a of a rectangular solids with length l, width,w and height h. 2. solve this formula for h 3. solve this formula for l The ...
*September 22, 2008 by jessica*

**Physics E=mc^2**

Can you explain what formula (like quadrantic..whatever formula) and what is it for. The equation E=mc^2. Thanx!
*March 29, 2009 by John*

**physics**

you are given the formula d=30-q. use it to find a formula for q using d.
*April 7, 2011 by Anonymous*

**Physics**

Whats the difference between frictionless and friction in a way of solving? Like in formula, and what formula should use
*August 22, 2014 by Kae*

**physics**

What is the general formula for energy?When asked to write formula for energy in general without specifying kinetic or potential or work can we write eienstien's e=mc2 formula?
*September 22, 2012 by J.Nandhini*

**Physics**

A ball is thrown from ground level up in the air at 61m/s. How fast is the ball going 1s after being thrown. This problem wants you to use the formula v = (-1/2)gt^2 + v_0 g=9.8m/s^2 and v_0 = 61m/s so v = (-1/2)g*(1s)^2 + 61m/s at t = 1. I wrote the formula wrong. It should ...
*September 14, 2006 by Jennifer*

**Physics**

The question said find the speed of sound at a certain temperature. What formula would you use? Could someone tell me the formula so I could do the questions that correspond.
*February 25, 2009 by Lena*

**physics**

how large a force is required to accelerate a 1300 kg car from rest to a speed of 20 m/s in a horizontal distance of 80 m ? I'm trying to find the formula and then plug in the correct #'s into the formula.
*February 11, 2010 by courtland*

**math and physics**

i just want to know form where i got on this formula the 4.9t² on this formula s=4.9t²+Vot+h because the book only say that a physics theory shows that when an object is thrown upward with an initial velocity Vo, its approximate height is given by that quadratic function i ...
*October 24, 2008 by steve Alexander*

**Pre-Algebra**

Please help to solve to find x,y 1. y=7x-3 2. 4x+2y=8 Take the value of y in the first formula and substitute it for y in the second formula. Solve the second formula for x. Once x is found, solve for y in the second formula. Check by inserting both values into the first ...
*May 18, 2007 by Lee*

**chem**

could anyone tell me why the molecular formula of agas is not always the same as the empirical formula tnx It may be a dimer or a trimer. For example, CH is the empirical formula for acetylene but the molecular formula is HC(triple bond)CH or C2H2.
*February 3, 2007 by bex*

**pHYSICS**

iTS A HARD QUESTION. wHAT IS THE FORMULA FOR SPEED? sOLVE TWO SPEED PROBLEMS WITH A DIFFERENT MISSING PART OF THE FORMULA.
*November 15, 2008 by fahad*

**physics help!!!**

How do you find the speed of sound wave using the formula for speed when you have 195 Hz 89.4m in 0.311s. Help what formula to use what's the answer???
*February 7, 2012 by lili-chan*

**Physics**

Why is sin theta used in the torque formula while the work formula uses cosine theta?
*March 24, 2010 by Morgan*

**Physics (Formula)**

I just need the formula. A 2.5 kg object is whirled in a vertical circle whose radius is 0.89 m. If the time of one revolution is 0.94 s, the magnitude of the tension in the string (assuming uniform speed) when it is at the top is
*February 13, 2013 by Eve*

**Physics**

I have a forumla question. I have this formula x=1/2t^2. Is this the formula to find the acceleration that is caused by gravity?
*September 3, 2007 by Soly*

**chemistry**

why is the formula written for an ionic compound such as NaCl the empirical formula,rather than a molecular formula?
*April 27, 2008 by caleb*

**Chemistry**

What molecular formula can you deduce from a mass spectrometry of 156 m/z. And how do you get that formula? Steps on how to get the formula is much appreciated! Thanks!
*November 12, 2013 by Fred*

**chemistry**

If a compound's empirical formula is CH2O and its' formula mass is 120.12 amu, what is its' molecular formula
*December 13, 2009 by nick*

**chemistry**

Determining a Molecular Formula from an Empirical Formula 1. A compund has an experimental molar mass of 78g/mol. Its empirical formula is CH. What is its molecular formula?
*March 24, 2009 by jaz*

**chemistry**

Determining a Molecular Formula from an Empirical Formula 1. A compund has an experimental molar mass of 78g/mol. Its empirical formula is CH. What is its molecular formula?
*March 24, 2009 by chrissy*

**Algebra**

I have two problems that I am not sure about how to work out. 1. The distance traveled by a falling object is given by the formula d=4.9t^2, where d is in meters and t is in seconds. Solve the formula for t. 2.The volume of a right circular cone is given by the formula V=1/3(...
*March 31, 2008 by FCH*

**ALGEBRA**

I have two problems that I am not sure about how to work out. 1. The distance traveled by a falling object is given by the formula d=4.9t^2, where d is in meters and t is in seconds. Solve the formula for t. 2.The volume of a right circular cone is given by the formula V=1/3(...
*March 31, 2008 by Casey*

**math 213**

The effect of depreciation can be computed using a formula similar to the formula for compound interest. a. Assume depreciation is the same each month. Write a problem involving depreciation and solve it. b. Develop a general formula for depreciation defining what each ...
*April 19, 2010 by billy bob*

**AP Chemistry**

The structural formula for acetic acid is CH3CO2H. What is its empirical formula; what is its molecular formula?
*September 26, 2011 by Ceasar*

**Physics**

I'm haivng troulbe proving the deriviation of this formula on my own... could you please help me derive the proof of the formula or maybe show me one thansk... I need to prove this formula period of a mass spring system in simple harmonic motion T = 2 pi square root of (m/k) ...
*May 30, 2009 by Kim*

**Chemistry**

Please check my answers for the following questions. THANK YOU. 1) The empirical formula of a compound that is 25.9% nitrogen and 74.1% oxygen is.... ANSWER: N2O 2) empirical formula of a compound that consists of 4.80 grams of carbon, 1.20 grams of hydrogen, and 2.80 grams of...
*August 2, 2007 by anonymous*

**physics**

A 25 kg object accelerates from rest to a 0.45 m/s in 1.3 seconds. If the coefficient of friction between the object and the floor is 0.15. Find the force that can accelerate it. I don't know how to derieve the formula for this one..please help.. FROM the FORMULA: -netF=Ff-Fx
*October 14, 2009 by Shane*

**PHYSICS - formula?**

Here is one of my questions from my physics study. It tells me the answer (35 J), but how do I find that answer? I would appreciate a formula or step by step calculation. Thanks! :) A 30 kg kid on rollerskates is moving 1 m/s. His brother pushes him with a force of 5 N. What ...
*March 26, 2013 by Anna*

**chem**

balance the formula Cu(OH)2(s) + HNO3(aq) -> H2O(l) + fine the formula here(aq) i did the H20 but i don't know the other formula i thought it was CuNO3 but thats wrong and idk what to do with the extra O
*November 27, 2010 by hannah*

**chemistry**

why is the molecular formula of oide of arsenic in its gaseous state is not neccessarialy the same as its empirical formula what does this mean and how do i do it Molecules are known to dimerize or trimerize. We actually don't know what the molecular formula is until we ...
*January 30, 2007 by donald*

**Physics-Please help with formula**

If I have an electric field around a charged object that is 2.95 x 10^6 N/C at a distance of 0.400m, how would I find the charge on the object? If you could just direct me with a formula-then I'll do it and check back with my answer-Thank you for you help
*February 25, 2011 by Shiela*

**Chemistry (Check)**

True or False The empirical formula of a compound is always the same as the molecular compound. My Answear: True The empirical formula for acetylene is CH. The molecular formula is C2H2. Another example: The empirical formula for glucose is CH2O. The molecular formula is ...
*February 4, 2007 by Bryan*

**Re: Finance**

Thanks, Economyst. What formula did you use to calculate 17.53117? I found a formula that I thought would work to get that sum, but I got a different number. The formula is: 1 - 1.1^(-10)/ 0.1 and also: (40000* 163)/17.53 = $371933 is the answer?
*September 29, 2008 by John*

**physics Classical Mechanics**

Hi, Greco. I am using the following formula to solve Ballistic Missile: sqrt(5*G*m_1/4*r_1). Given the following: m_1=5*10^24kg; r_1=6000;alpha=30 degrees;r_2=(5/2)r_1; G= 6.674*10^-11kg/m^3s^-2. I thought I did it correctly using the proper formula. My answer was incorrect. I...
*December 8, 2013 by Hil*

**AP Physics**

I'm trying to derive the formula v^2 = v0^2 + 2a(x-x0) were zeros are subscripts my book tells me to derive it this way use the definition of average velocity to derive a formula for x use the formula for average velocity when constant acceleration is assumed to derive a ...
*June 18, 2009 by AP Physics*

**Physics**

A pendulum consists of a tiny bob of mass M and a uniform cord of mass m and length L. A) determine a formula for the period B) what would be the fraction error if one used the formula for a simple pendulum.
*April 22, 2008 by (Simple)*

**Physics**

I'd like to know when it is appropriate to use each formula. Im new to studying physics and its seems that there are certain situations when one formula leads to the answer, yet a derivative of that formula that should lead to the answer is incorrect. For example: the question...
*March 7, 2013 by Jeremy*

**Chemistry**

If you divide the molar mass of a compound by the empirical formula mass, what is the result? That division should be VERY close to a whole number. Usually, 0.9 to 1.1 or 1.9 to 2.1 (all depending upon the accuracy and precision of experimental data). That number is the number...
*February 4, 2007 by Chris*

**QUANTITATIVE REASONING FOR BUSINESS**

FOR AN INSTALLMENT LOAN, A FORMULA IS USED TO FIND THE TOTAL AMOUNT OF INSTALLMENT PAYMENTS. THE FORMULA IS TOTAL INSTALLMENT PAYMENTS = INSTALLMENT PRICE - DOWN PAYMENT. THE FORMULA CAN BE WRITTEN IN SYMBOLS AS T = P - D. SOLVE THE FORMULA FOR D.
*January 17, 2014 by Alesha*

**Pre-calculus need help!!**

Quadratic Formula 1.) x+6/x=-7 2.) 4x/x+4 + 3/x-1 = 15/x^2+3x-4 3.) x+3/x - 2/x+3 = 6/x^2+3x formula: -B+ sqrt B^2 + (-4)(a)(c)/2a f u only wanted to use the formula it's not necessary though. please help me! it's going to pass tomorrow!! please!
*February 18, 2013 by Isis*

**Chem 22**

balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you
*December 2, 2010 by Ivy*

**Chem 22**

balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you
*December 2, 2010 by Ivy*

**Algebra**

The simple formula for the nth term of an arithmetic sequence is an = 4n + 16. What is the explicit formula corresponding to the simple formula?
*April 4, 2013 by Help Please!*

**Algebra 2**

The simple formula for the nth term of an arithmetic sequence is an = 4n + 16. What is the explicit formula corresponding to the simple formula?
*April 4, 2013 by Tifini*

**math**

The simple formula for the nth term of an arithmetic sequence is an = 6n + 14. What is the explicit formula corresponding to the simple formula?
*May 28, 2014 by junner*

**Math**

Mathematicians have been searching for a formula that yields prime numbers. One such formula was x2 - x+41. Select some numbers for x, substitute them in the formula,and see if prime numbers occur. Try to find a number for x that when substituted in the formula yields a ...
*December 17, 2010 by Jean*

**Chemistry**

Chemical analysis reveals capsaicin to contain 71.0% of carbon, 8.60% hydrogen, 15.8% oxygen and 4.60% nitrogen. a) Determine the empirical formula of capsaicin b) Each molecule contains one atom of nitrogen. What is the molecular formula of capsaicin? I figured out the ...
*October 22, 2007 by Marty*

**chemistry**

I need to know if I have th right molecular formula for Sorbito 39.56g C 7.75g H 52.7g O Empirical Formula is CH2O 30.026 amu how I how calculate the molecular mass and how I figure out the melecular formula? please help
*October 28, 2008 by Joshua*

**Chemistry re-post URGENT**

Chemical analysis reveals capsaicin to contain 71.0% of carbon, 8.60% hydrogen, 15.8% oxygen and 4.60% nitrogen. a) Determine the empirical formula of capsaicin b) Each molecule contains one atom of nitrogen. What is the molecular formula of capsaicin? I figured out the ...
*October 22, 2007 by Marty*

**physics**

i'm not very good at physics and i have an exam tomorrow!! for the first one do i use the formula F=-Kx to make the answer -4500 ? and for the second i really have no idea what formula to use what is the value for k if a spring stretches 0.4m when submitted to a 1800N force? ...
*October 15, 2008 by sammi*

**Physics**

A force of 270N acts on a mass of 13.5kg for 13sec. Calculate a) the acceleration b) the final velocity c) the distance covered. a)F=m*a, so 270=13.5*a/13, answer 260m/s b)Not sure which formula. c)Formula d=v*t, once velocity is worked out in question b). I am not sure with a...
*January 1, 2015 by Steph*

**chemistry**

In the course of research, a chemist isolates a new compound with an empirical formula C3H3O2. 4.97 g of the compound when dissolved in 100. g of water produces a solution with a freezing point of −0.325°C. What is the molecular formula of the compound? (For water, Kf = ...
*September 8, 2010 by Diana*

**math**

How much force is needed to accelerate a 50-kg rider and her 250-kg motorcycle at 5 m/s2? This is really a physics question. The equation that you use is Newton's second law, Force = Mass x Acceleration. In this case, the total mass being accelerated is 300 kg. Multiply that ...
*June 12, 2007 by kent*

**Pre-algebra**

Transform the formula. The area of a triangle A can be found with the formula A=1/2bh where b is the length of the base of the triangle and h is the height of the triangle. Solve the formula for h.
*January 20, 2011 by Jacob *

**General Chemistry**

An unknown compound has a formula of CxHyOz. You burn 0.1523 g of the compound and isolate 0.3718 g of CO2, and 0.1522 g of H2O. What is the empirical formula of the compound? If the molar mass is 72.1 g/mol what is the molecular formula?
*December 8, 2010 by Jashmid*

**Physics PLEASE**

I'm trying to derive the formula v^2 = v0^2 + 2a(x-x0) were zeros are subscripts my book tells me to derive it this way use the definition of average velocity to derive a formula for x use the formula for average velocity when constant acceleration is assumed to derive a ...
*June 19, 2009 by Physics PLEASE*

**chemistry**

Determine the number of moles of each specified atom or ion in the given samples of the following compounds.( Hint: the formula tells you how many atoms or ions are in each molecule of formula unit.) a. O atom in 3.161x10^21 molecules of CO2 b. C atom in 3.161x10^21 molecules ...
*March 8, 2009 by bre bre*

**chemistry need help**

Determine the number of moles of each specified atom or ion in the given samples of the following compounds.( Hint: the formula tells you how many atoms or ions are in each molecule of formula unit.) a. O atom in 3.161x10^21 molecules of CO2 b. C atom in 3.161x10^21 molecules ...
*March 10, 2009 by bre bre*

**Math Check please**

Suppose c is inversely proportional to the square of d. If c = 4 when d equals 3.find the constant of proportionality and write the formula for c as a function of d c= 36/d^2 use your formula to find c when d is 5. is it 100/d2 or 100/5^2? I know the formula is c=k/d^2 c = ?
*November 21, 2014 by Taylor*

**Algebra**

Write a recursive formula for the following sequences: 1) 1,6,11,16... 2) 4, 12, 36, 108... 3) A ball is dropped from an initial height of 10 feet. The maximum heights the ball bounces are as shown (10 ft, 6 ft, 3.6 ft, 2.16 ft) a-write a recursive formula b-write an explicit ...
*January 28, 2015 by INeedHelp*

**chemistry - empirical formula**

write the empirical formula for each of the following molecular formulae" a)P4O10 b)C2H6 Confused as to what the diff.is b/w empirical and formula...have no idea how to answer these b/c they look like empirical formulas to me
*May 23, 2008 by Sarah*

**Algebra**

The formula T=2π√L/480 can be used to find the period (T in seconds, the time it takes a pendulum to complete one cycle) of a pendulum that is L cm long. (a)Rewrite this formula using rational exponents. Don't forget to rationalize the denominator. (b)Solve the ...
*June 11, 2011 by Melvin*

**physics**

differentiate between density,mass and volume. state a formula in terms of mass density and volume. using the formula calculate the volume of a 10kg block of ice
*February 12, 2012 by john*

**physics**

do you know where I can get a formula sheet for physics our book does not include a break down of them
*September 15, 2011 by Anonymous*

**Physics**

I'm having trouble understanding which formula to use to answer this question. What is the apparent weight of an astronaut weighing 77kg shortly after blasting off in a roacket at an upward acceleration of 80/meters per second squared? I know he/she will feel about 3 times ...
*January 31, 2010 by CJ*

**Physics (Formula)**

A string requires a 191.0 N force in order to break. A 1.75 kg mass is tied to this string and whirled in a vertical circle with a radius of 1.92 m. The maximum speed that this mass can be whirled without breaking the string is Again I just need the formula!
*February 13, 2013 by Eve*

**chemistry**

I got the molecular formula is NaHCO3+H2SO4=Na2SO4+CO2+H2CO3 and i got the total ionic formula is NaOH+H2CO2(aq)= Na2CO3 + HOH but i am having trouble finding the net ionic formula can you please help me thank you
*May 13, 2014 by ashley*

**Physics (optics) - Black Body Radiation**

If you use a filter that transmits only between 1.95-2.05 um, what is the total power falling ona 1 cm^2 detector 1m away from a 1cm^2 1000K black body? I know the formula for I and I think I need to integrate something, but I have no idea what formula to use for this problem.
*November 20, 2006 by Sam*

**Finding a Formula, help please !**

Does anyone know the formula to find any point between two other given points in a line? Please, and thank you! The mindpoint formula xm= _(x1 + x2) /2 ym = (y1 + y2) /2 This give the midpoint (xm, ym) between the points x1,y1 and x2,y2 Thanks for the tip, but I was wondering ...
*January 14, 2007 by Paris*

**5th grade Math**

I have a review question that says: The formula for the circumference of a circle is C = pi x d, where d represents the circle's diameter. Which statementis correct? Would it be D? Wasn't sure if a diameter could have a decimal or fraction. A. the formula only works if d is 1 ...
*March 27, 2012 by Brandi*

**a formula for excel**

I have a formula but I can see to get it. shirt 13 at 29.95, pants 22 at 31.99, shoes 18 at 74.99, dress 16 at 69.99, then I have a discount for 15% and an additinal 10 discoun. Then I have the sales tax for 8.25% and I get see to ge the formula for these. Please help me I ...
*June 3, 2008 by vero*

**Philosophy**

Prove informally, by employing correct definitions and principles of reasoning, that the following are true. 1/ Every formula implies itself. (That is, A implies A . Hint: For this one you will need to employ the definition of interpretation.) 2/ If set S implies formula A , ...
*October 22, 2010 by Maggie*

**Physics**

I'm stumped on what formula to use for the following question. A 1.5V battery does 4.5*10^2 J of work in 120s. Calculate the current through the battery Calculate the number of elementary charges that pass through the battery. I've been trying to figure out the formula to ...
*August 26, 2009 by Kate*

**Physics**

I have this formula z=1/x (which is the formula for conductance) My x values are: 98.3 ohms, 967 ohms, and 545 ohms. What would my "z" values be? I know the units would be siemens.
*November 3, 2007 by Soly*

**nath**

The formula, Total price=Unit price x Number of units, is used to find the total price of the product. The formula can be written in symbols as T=UN. Solve the formula for U.
*September 8, 2013 by Francine*

**chemistry**

A compound has the following composition. C 54.5%, H 9.10% and 0 36.4% its molecular weight is 88.10. Determine its empirical formula and molecular formula. Take 100 g sample. That gives you 54.5 g C, 9.10 g H and 36.4 g O. Now convert those grams to mols. 54.5/12.01 = mols C ...
*June 24, 2007 by Brooke*

**physics**

what formula do i need in order to solve this a force of 230 N applied on a hydraulic lift raises an automobile weighing 6500 N. If the applied force is exerted on a 7.0 m^2 piston, what is the area of the piston beneath the automobile? can someone show me how to do this in ...
*February 18, 2009 by y912f*

**Math**

invested 2000 gains 0.2 every odd numbered month final value after first month? i've tried solving this with a formula, but every formula i come up with is wrong. Could someone tell me how to solve this and plug in the right numbers into a formula?
*September 5, 2011 by Amy*

**UNCP**

In a study of worker efficiency at Wong Laboratories it was found that the number of components assembled per hour by the average worker t hours after starting work could be modeled by the formula. Rewrite the formula by factoring the right-hand side completely. b) Use the ...
*January 7, 2011 by casey*

**Help...pHysics**

a ball is thrown at 15m/s at an angle of 30 degrees to the horizontal , how far does it travel horizontally before making contact with the ground? I don't remember very well, but I believe the formula you need is: x0 = -.5at^2 + vt + x where x0 is the initial distance (a.k.a...
*October 7, 2006 by sean*

**AP Physics**

Hello I was trying to find the proof of the formula x = x0 + v0t +.5at^2 were the zeros are subscripts My text book dosen't explain it that well. ok well it involves the formula for average velocity aver velocity = 2^-1(v0 + v) were the zero is a subscript and this is just ...
*June 13, 2009 by AP Physics*

**Formula**

The formula for usinng alligation to repare solutions work for solutions between__ %and __ % a.0,50 b.25,75 c.50,100 d.0,100 Somewhere there is a disconnect between my understanding of chemistry and yours: What is alligation? What formula are you speaking of? Spelling is ...
*March 5, 2007 by KUZAVA*

**PreCalculus REINY HELP PLEASE**

well yay thanks for the answer but i really need the formula lol I tried to derive it on my own but it was a little bit rough lol i need the formula it wasn't in my book and I don't know what the name of the formula would be so i can't really google it...
*April 28, 2010 by Kate*

**algebra**

an insecticide originally contained 1/2 oz of pyrethrins. the new formula contains 5/8 oz of pyrethrins. what percent of pyrethrins of the original formula does the new formula contain?
*October 9, 2010 by smith*

**physics**

1.A proton enters a 2.0 X 10^-2 T magnetic field with a speed of 5.8 X 10^4 m/s. What is the radius of the circular path it follows? formula?? 2.Electrons moving at 3.5 X 10^4 m/s pass through an electric field with an intensity of 5.6 X 10^3 N/C. How large a magnetic field ...
*April 9, 2008 by martin*

**Chemistry**

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its molecular weight is 102.2...
*February 20, 2012 by Matthew*

**Chemistry**

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its molecular weight is 102.2...
*February 20, 2012 by Matthew*

**CHEMISTRY FORMULA**

How would you write the chemical formula for Mercury(I) nitrate. i have Hg(NO3)2 since the charge of nitrate is -2 and Mercury's is 1. However, upon checking online i found that the correct formula is Hg2(No3)2. I don't understand where the subscript 2 of Hg originated from' ...
*October 17, 2010 by Moi*

**Chemistry help?**

The mass of a quantity of NiCl2 is 24.6 g. How many formula units are in the sample? A. 3.2 3 1023 NiCl2 formula units B. 5.3 3 10–21 NiCl2 formula units C. 1.1 3 1023 NiCl2 formula units D. 1.9 3 1027 NiCl2 formula units
*August 15, 2013 by Kaylee*

**physics**

ok, to calculate KE of a non-relativistic electron, we use the formula: K=.5mv^2=p^2/2m and K=h^2/(2m wavelength^2) do we use the same formula to calculate the KE of a non-relativistic proton?
*May 28, 2009 by Emma*

**IGCSE Chemistry**

Hydrocarbons A and B both contain 85.7 % carbon. Their molar masses are 42 and 84 respectively. a) Which elements does a hydrocarbon contain? b) Calculate the empirical formula of A and of B. c) Calculate the molecular formula of A and B. I solved a) and b) the solutions are a...
*December 25, 2011 by Amir*

**PHYSICS!!!**

To simulate the extreme accelerations during launch, astronauts train in a large centrifuge. If the centrifuge diameter is 13.5m , what should be its rotation period to produce a centripetal acceleration of If the centrifuge diameter is 13.5m , what should be its rotation ...
*September 14, 2013 by Amy*

**Physics (electricity)**

Which formula do you use for this problem ? two charged spheres, one suspended from a insulated thread and another held in place and unable to move. when one sphere S1 is brought to a distance of 2.00 x 10^-2m from S2, the acceleration of S1 is 3.00 x 10^10 m/s^2. If S1 is ...
*May 27, 2012 by Art*

**Physics**

Sam pushes crates starting form rest across the floor of his classroom for 3 s with a net force as shown above. For each crate, rank the following from greatest to least: A 100N/30kg, B 75N/20kg C 50N/10kg 1. Impulse delivered 2. Change in momentum 3. Final speed 4. Momentum ...
*November 12, 2014 by Kay*

**chemistry**

How do I find the empirical formula for aluminium selenide? You have to have some data, such as masses, or percent: Empirical means it was measured. The empirical formula for aluminium selenide is the same as it's molecular formula; Al2Se3. The empirical formula requires both ...
*January 6, 2007 by Mac*

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