Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 212

**Calculus: Optimization**

I have no idea how to approach this problem, if someone knows just how to relate h, r with H,R, that would be extremely helpful and I can workout the rest! Thank you in advance. Given a right circular cone, you put an upside-down cone inside it so that its vertex is at the ...
*February 17, 2015*

**Chemistry URGENT**

Could someone let me know if I answered these questions? 1. How do you classify the liquid pair mineral oil -- H2O, miscible or immiscible? I believe the answer is immiscible because oil and water do not mix. 2. what would be the Molarity of a solution containing 0.5 mole of ...
*April 29, 2014*

**Chemistry URGENT/DR BOB**

Hello Dr.Bob, the saturate at 60 degrees Celsius is 85.5g i hope this helps with the problem I posted at 12:49am thanking you in advance
*April 28, 2014*

**Chemistry URGENT**

Help. what is the formula to figure out the total mass of a solution?
*April 28, 2014*

**Chemistry URGENT**

can someone please tell me what formula's to use for the 2 following chemistry problems. 1. Calculate the solubility of potassium bromide at 23 degrees Celsius. hint. Assume that the solubility increases by an equal amount for each degrees between 20 degrees C and 30 ...
*April 28, 2014*

**Chemistry URGENT**

A student heated a hydrated salt sample with an initial mass of 4.8702 g, After the first heating, the mass had decreased to 3.0662 g (two part question) 1. if the sample was heated to constant weight after reheating, what is the minimum mass that the sample can have after the...
*April 26, 2014*

**Chemistry URGENT**

I need help to evaluate if I completed my experiment calculation. determination of water in a hydrate. 1. Mass of crucible, and cover = 18451.3 2. Mass of crucible, cover and sample = 23410.2 3. Mass of crucible, cover and sample after 1st heating = 21789.8 4. Mass of crucible...
*April 26, 2014*

**Chemistry URGENT/DR BOB**

Hello DR. BOB, the correct value in the problem posted at 1:17pm regarding Student A and Student B accuracy and random error is the: MEAN of 2.63 g/mL. Could you take a look back at that post and let me know if i answered 2 and 3 correctly.
*April 26, 2014*

**Chemistry URGENT**

I need help figuring out the calculations of my experiment. I'm sure I did something wrong cause I can not figure how to calculate the mass of sodium chloride. My measurements follow. 1. 250 mL beaker = 8.4 2. Mass of container = 0.4013 3. mass of container + sodium ...
*April 26, 2014*

**chemistry URGENT**

I need someone to check my answers to make sure that I have the correct answers. (3 Part Question) Two students each measure the density of a quartz sample three times: Student A Student B 3.20 g/mL 2.82 g/mL 2.58 g/mL 2.48 g/mL 2.10 g/mL 2.59 g/mL mean 2.63 g/mL 2.63 g/mL 1. ...
*April 26, 2014*

**Chemistry URGENT**

I am not good with math problems. I need help with these two problems. I'm not sure what equations to use. please help. A student heated a hydrated salt sample with an initial mass of 4.9702 g. After the first heating, the mass had decreased to 3.0662g. 1. if the sample ...
*April 24, 2014*

**Chemistry URGENT**

I need someone to check to make sure that I balanced my equations correctly. I have to add a (g) or (s) to indicate gases and precipitates. I am having a hard time figuring out the ions and how to add them, if any of these reactions need a ion could you explain it to me as ...
*April 24, 2014*

**Chemistry URGENT**

I am having a hard time understanding how to calculate pH. my textbook states that that pH =-log[H^+]. I have two questions that asks: What is the H^+ concentration in an acid with of pH 4.6? Express your answer as a power of 10. What is the H^+ concentration in a base with a ...
*April 24, 2014*

**Chemistry URGENT/DR BOB**

I have a couple of unfinished experiments i need help with as well. If you can help me. Thanking you in advance. If I tested the ph of NaOH and its H+ was 12.2 how would I express this in a power of 10? I really have no clue. Need help.
*April 23, 2014*

**Chemistry URGENT/DR BOB**

Hello Dr. Bob I have been sick and missed some of my classes and my classmates want to act stupid. So if its not too much trouble could you just make sure that I am on the right track and let me know what is wrong and how I can fix them. I have a lot of assignments that I have...
*April 23, 2014*

**chemistry urgent**

I think I balanced these equation right please check and let me know. i am suppose to complete and balance the equations representing the reactions. NaHCO3 (s) + HCL (aq) >>>> NaCl + 2CO+H2O CaCo3 (s) + HCL (aq)>>> CaCl + CO3H Thanks
*April 23, 2014*

**Chemistry URGENT/DR BOB**

Can someone may sure that I balanced the following groups of equations correctly. Write an equation to show how acetic acid reacts with water to produce ions in solution. C2H4O2 + H2O >>>>>>> H3O + C2H3O Write an equation for the neutralization of HCl and ...
*April 23, 2014*

**chemistry**

I want to know if someone could let me know if I have written my balanced equations correct for the following questions. Write a balanced equation for the reaction of zinc with sulfuric acid. Zn + H2SO4 >>> Zn(S04) +H2 Write a balanced equation for the reaction of ...
*April 21, 2014*

**chemistry**

I am unsure about balancing equation I would like for someone to let me know if I am working this out correctly? I have to write a balanced equation for the reaction when solid magnesium is added to a solution of lead(ii)nitrate, solid lead forms and the magnesium disappears ...
*April 14, 2014*

**chemistry**

I have to write a balanced equation for the reaction of a solid lead being added to a solution of silver nitrate. Solid silver forms and the lead disappears as it goes into the solution as lead (ii) nitrate. I think it should be Pb + AgNO3 >>>> Ag + Pb(NO3)2 does ...
*April 14, 2014*

**chemistry**

I have to write a balanced equation for the decompostion of solid copper (ii) sulfate to form the gaseous sulfur trioxide and solid coper (ii) oxide. I would appreciate it if you could tell me if I have written it correctly. CuSO4 >>> SO3 + CuO If I did not write this...
*April 14, 2014*

**chemistry**

is 3M less or more concentrated than 9M of sulfuric acid? I think that 9M is more concentrated but I wanted to make sure. thanks
*April 8, 2014*

**CALCULUS ECONOMICS**

correct!!!! thnks dude
*March 13, 2014*

**CALCULUS ECONOMICS**

wrong !!!
*March 13, 2014*

**abnormal psychology**

Is this true or false Abnormal psychology examines the concept of “differentness.” The spectrum of “differentness” is narrow in scope when compared to other areas of psychology.
*November 3, 2013*

**abnormal psychology**

Is this true or false With regard to life transitions, adolescence appears to be a time of particular stress because of the many changes that occur.
*November 3, 2013*

**abnormal psychology**

Is this true or false Behavioral medicine and health psychology are concerned with reducing the stress of illness but not necessarily preventing the stress.
*November 2, 2013*

**Math :(**

I'm having a hard time with the "no solution" problems. I'm still trying to find an answer when clearly there's none. Thank you
*September 16, 2013*

**Math :( **

2b=b+2+b 2b= 2b+2 -2b=-2b+2 __________ B=2????
*September 16, 2013*

**Math**

Thank you.
*September 16, 2013*

**Math**

2(4m+6)=8m+6 8m+12=8m+6 -6= -6 _________ 8m+6= 8m -8m. =-8m __________ 6=m I think in doing something wrong just not to sure when I check both sides give me different answer can someone explain please
*September 16, 2013*

**Math**

Five more than three times a number is 196 what is the number?
*September 16, 2013*

**Math**

kjhjy;l;
*April 21, 2013*

**Math-Data Management**

In a random Sample of Canadians 30% have Beeburr CD's (B) 35% have Fergie CD's (F) 55% have Motorhead CD's (M) 5% have B and F 10% have B and M 10% have F and M 95% have at least one artist place in Venn Diagram Find Number and Describe: a) _____ n(BuFuM) b)Exactly...
*February 27, 2013*

**Math 0098**

Last year, Deon had $20,000 to invest. He invested some of it in an account that paid 6% simple interest per year, and he invested the rest in an account that paid 10% simple interest per year. After one year, he received a total of $1880 in interest. How much did he invest ...
*February 22, 2013*

**Math 0098**

I dont think I'm doing this right because i am getting HUGE numbers like 156,000
*February 22, 2013*

**Math 0098**

it would be 7x+7y=70000? I dont know how to solve the two equations
*February 22, 2013*

**Math 0098**

where did you get .08 from?
*February 22, 2013*

**Math 0098**

Last year, Joe had 10,000 to invest. He invested some of it in an account that paid 7% simple interest per year, and he invested the rest in an account that paid 9% simple interest per year. After one year, he received a total of $860 in interest. How much did he invest in ...
*February 22, 2013*

**Math 0098**

Last year, Joe had to invest. He invested some of it in an account that paid simple interest per year, and he invested the rest in an account that paid simple interest per year. After one year, he received a total of in interest. How much did he invest in each account?
*February 22, 2013*

**math**

the paralle side of trapezium are 20m and 30m and its non-paralle sides are 6m and 8m .find the area of trapezium
*November 22, 2012*

**Modern world studies**

Give me 5 trace rise of japan from an isolated society to major industrial and imperial power.
*October 23, 2012*

**Modern world studies**

Write a short paragraph that traces the rise of japan from an isolated society to major industrial and imperial power.
*October 23, 2012*

**check geo **

the us is a leading exporter of a.oil natural gases b.rice products c.beef and grain. d.cranberries and rasberries
*July 26, 2012*

**chemistry**

8905=80(x)(200) and solve for x
*June 21, 2012*

**physics**

The electron in a hydrogen atom with an energy of -0.544 eV is in a subshell with 18 states. What is the principal quantum number, n, for this atom? What is the maximum possible orbital angular momentum this atom can have? Is the number of states in the subshell with the next ...
*April 12, 2012*

**physics**

An electron drops from the L shell to the K shell and gives off an X-ray with a wavelength of 0.0205 nm. What is the atomic number of this atom?
*April 12, 2012*

**physics**

Mars Rover When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12 min to travel from Earth to the rover.How far was Mars from Earth at that time?
*March 4, 2012*

**physics**

What is the rms value of the electric field in a sinusoidal electromagnetic wave that has a maximum electric field of 64 V/m?
*March 4, 2012*

**physics**

A 9.2V battery is connected in series with a 33mH inductor, a 190 Ohms resistor, and an open switch. A)What is the current in the circuit 0.140 ms after the switch is closed? in milli amps b)How much energy is stored in the inductor at this time? in micro joules
*February 28, 2012*

**physics**

A circuit consists of a 12.0 V battery connected to three resistors 44 ohms, 15 ohms and 120 ohms in series. A)Find the current that flows through the battery. B)Find the potential difference across the 44 Ohms resistor. C)Find the potential difference across the 15 ohms ...
*February 12, 2012*

**chemistry**

Find the mass of urea needed to prepare 51.7 g of a solution in water in which the mole fraction of urea is 7.59×10−2. anyone have the same values?
*January 31, 2012*

**physics**

A uniform electric field of magnitude 2.80×10 ^4 N/C makes an angle of 37 degrees with a plane surface of area 1.40×10−2 m^2. A)What is the electric flux through this surface? N * m^2/C
*January 27, 2012*

**physics**

The electric field at the point x = 5.00cm and y = 0 points in the positive x direction with a magnitude of 10.0 N/C. At the point x = 10.0cm and y = 0 the electric field points in the positive x direction with a magnitude of 16.0 N/C. Assume this electric field is produced by...
*January 27, 2012*

**physics**

An object with a charge of -4.5 micro C and a mass of 1.1×10−2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. A) Find the magnitude of the electric field. B)Find the direction of the electric field. ...
*January 27, 2012*

**physics**

Two point charges, the first with a charge of +3.04×10−6 C and the second with a charge of -4.63×10−6 C , are separated by 22.5 cm. Find the magnitude of the electrostatic force experienced by the positive charge. Is the magnitude of the force ...
*January 27, 2012*

**Math**

Equation Models Question Symbolic Model 2x+3=(-5) Answer and check the solution please.
*January 18, 2012*

**Math**

Well thank you very much Ms.Sue i appriciate it. Have a great day or night!.
*January 18, 2012*

**Math**

How would you use 2x+3=(-5) in a symbolic model? same things as we have been doing.
*January 18, 2012*

**Math**

Thank you!! Thank you!!
*January 18, 2012*

**Math**

Does (-18) balance with (-6)+ 3(-4)? Show work to answer please
*January 18, 2012*

**Math**

Need help understanding 2010-2011 Transitional Unit: 06 Lesson 01- Unit: 05 TESCCC source It is called Maintain Your Balance Can someone please help?
*January 18, 2012*

**Math**

Thank you sooooo much! You ROCK!
*January 4, 2012*

**Math**

Write the first five numbers for the sequence that follows the rule 1/4x+3
*January 4, 2012*

**physics**

Water flows through a horizontal tube of diameter 2.9 cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa. Find the speed of flow in the first tube.
*December 4, 2011*

**physics**

Water flows through a horizontal tube of diameter 2.9cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa. A)Find the speed of flow in the first tube.
*December 4, 2011*

**physics**

A 5.2 m wire with a mass of 86 g is attached to the mast of a sailboat. If the wire is given a "thunk" at one end, it takes 0.085 s for the resulting wave to reach the other end. Part A What is the tension in the wire? Would the tension found in part A be larger or ...
*November 26, 2011*

**physics**

In a pig-calling contest, a caller produces a sound with an intensity level of 110 dB. How many such callers would be required to reach the pain level of 120 dB?
*November 26, 2011*

**geomatry**

the measure of one angle of a linear pair is 3 thimes the measure of the other angle. find the measures of the two angles
*October 18, 2011*

**Physics**

a car travels at 20km/h for 1.5h, at 30km/h for 2.0h, and at 40kmh for 0.75 h. What is the car average velocity
*August 1, 2011*

**math**

how about if the raduis of right circular cone is given and the surface area is given what is the formula? help please?
*July 13, 2011*

**Physics**

3. The mortar shell was short and you cannot change the explosive charge. You determine that a horizontal velocity of 1,592 feet per second will put the mortar shell. What angle should the mortar be elevated to?
*June 25, 2011*

**math**

$0.50
*June 20, 2011*

**music**

was schubert a romantic or classic composer?
*June 13, 2011*

**chemistry **

Sn1 / Sn2 mechanism: which one is faster and why? And which reactions will be quicker: neucleophilic subsitution with iodoalkanes or fluoroalkanes and why? thanks
*June 13, 2011*

**Chemistry**

They are both basic (pH is more than 7) but sodium bicarbonate is a weak base, and magnesium hydroxide is slightly stronger
*June 13, 2011*

**kahyla**

Maybe this helps: log(AB) = log(A) + log (B) so for question 1, ln(8x) is ln(x) + ln (8) log(2y)^5 is 5*log(2y) = 5*(log2 + logy)
*June 12, 2011*

**psychology**

Can you describe the specific behaviors. Describe the context in which the behaviors occurred.
*March 28, 2011*

**psychology**

what are the basic concepts of human interaction from a psychology perspective. In your examination, describe at least two examples of how human behavior changes based on social situations
*March 28, 2011*

**Math**

Mrs tan baked some muffins and packed them i big and small boxes for sale.Each big bbox contained 4 muffins and each small box contained 2 muffins.At first,there were 4 times as many small boxes as big boxes.After she had sold half of the small boxes and some big boxes,she ...
*January 8, 2011*

**chemistry**

a sample of unknown gas is found to have a volume of 479 mL at 27.0 degrees C and 1.30 atm. How may moles of gas are int eh sample?
*November 19, 2010*

**chemistry**

So do I have to do any conversions, say to moles or just take the sum of the values as is since the answer has to be in mm Hg?
*November 19, 2010*

**chemistry**

A typical air sample in the lings contains oxygen at 100 mm Hg, nitrogen at 573 mm Hg, carbon dioxide at 40mm Hg and water at 47 mm Hg. What is the total pressure on the sample in mm Hg?
*November 19, 2010*

**algebra 1**

what is the smallest solution to 4(x -1) > 16
*November 6, 2010*

**algebra 1**

heip me I tried everything 4(x -1) > 16
*November 4, 2010*

**algebra 1**

thanks
*November 4, 2010*

**algebra 1**

help me please What is the smallest solution to the inequality 4 (x -1) > 16?
*November 4, 2010*

**algebra 1**

can someone help me solve this equation 5x - 12 < 20
*November 3, 2010*

**Chemistry**

84.94moles
*November 2, 2010*

**Chemistry**

A single mole of AgNo3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNo3 would need to be dissolved in 5oomL?
*November 2, 2010*

**Chemistry**

Calculate the molarity of 1.77 mol of LiCl in 30.6 L of solution. This is for hw thats submitted online. the answer i got is 0.06 M. but it says its wrong, whyyyyy?
*October 29, 2010*

**algebra 1**

after diving 90m below the sea level, a diver rises at a rate of 4 meters per minute for 8 min. Where is the diver in relation to the surface
*October 26, 2010*

**algebra 1**

help please this question is driving my crazy. Suppose there is a 2-degree drop in a temperature for every thousand feet that an airplanes climbs into sky. If the temperature on the ground is 65 degrees, what would be the temperature when the plane reaches an altitude of 23,...
*October 26, 2010*

**algerbra1**

translate to an algebraic expression 49 less than b
*October 26, 2010*

**physics**

The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2.
*October 9, 2010*

**physics**

1.The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2. 2.An airplane taking off from a landing field has a run of 500 m. It starts from rest, moves with constant acceleration, and makes the run in 30 s. ...
*October 9, 2010*

**health**

Which organization would you call if you were involved in a natural disaster?
*October 6, 2010*

**chemistry**

what would be the mass of an Au sample whose volume is 2.85mL?( the density of gold is 19.3g/mL)
*October 3, 2010*

**chemistry**

what would be the mass of an Au sample whose volume is 2.85mL?( the density of gold is 19.3g/mL)
*October 3, 2010*

**l2l**

If I had 10 trees and i had to plant them in 5 rows of 4 how would it work i need to do this
*June 17, 2010*