Wednesday
May 4, 2016

# Posts by richard

Total # Posts: 283

Algebra
(8.1 . 10^8) . (4.2 . 10^3)
January 2, 2012

FRATION
12/345
December 8, 2011

Math-Statistics
Find a confidence interval for ƒÊ assuming that each sample is from a normal population. a. P x = 14, ƒÐ = 4, n = 5, 90 percent confidence b. P x = 37, ƒÐ = 5, n = 15, 99 percent confidence c. P x = 121, ƒÐ = 15, n = 25, ...
December 6, 2011

physics
What minimum strength of magnetic field is required to balance the gravitational force on a proton moving at speed 6 106 m/s?
December 5, 2011

Physics
What minimum strength of magnetic field is required to balance the gravitational force on a proton moving at speed 6*10^6 m/s?
December 4, 2011

Physics
If Galileo and his assistant were 16 km apart, how long would it take light to make the round-trip? How does this time compare with reaction times of about 0.4 s?
November 27, 2011

Retired 71 years old
If I borrowed \$78,000 from a bank and had perfect credit; How much interest would I have to pay in Dollars and cents? The loan is for 7 years
November 25, 2011

English
Rewrite the passage below correcting any errors of grammar and usage The mechanic drove out the car to Joe that was lubricated. As a matter of fact, he has not done enough on it as Joe has expected. But whatever it was he decides to take it like that. The experience with the ...
November 18, 2011

geometry
What happened when two fruit companies merged?
November 16, 2011

Geometry
Name the properties that justify the steps taken. AB=EF; thereforeAB+CD=EF+CD
November 12, 2011

Physics
What is the fundamental frequency for a 62 cm banjo string if the speed of waves on the string is 470 m/s?
November 7, 2011

Physics
How long is a wavelength of infrasound with a frequency of 4 Hz?
November 7, 2011

Physics
Radio waves travel at the speed of light, which is 3.00 108 m/s. What is the wavelength for a FM station broadcasting at 105.9 MHz (the prefix M is "mega" and means 106)?
November 7, 2011

Physics
What is the maximum total force exerted on a 78 kg astronaut by her seat during the launch of the Space Shuttle?
October 10, 2011

statistics
the mean is based off of 3 months. multiply it out to get the mean for a correct time period (1.5x4=6). I use the Poisson function in excel. Mean is equal to 6 and x is equal to 12 and 0. True is up to a certain number (up to 12) and false is exactly a certain number (exactly ...
September 30, 2011

Chemistry
Well Kae, 3KOH + Fe(NO3)3 -> 3KNO3 + Fe(OH)3
September 29, 2011

physics
A student of weight 990 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
August 30, 2011

math
a 4 digit number my 2 nd digitis twice my 3 digit the sum of all my digits is 3 times greater than my last digit the productof my 3rd and 4th digits is 12 times greater than the ratio of my 2nd to 3rd whats my number?
August 18, 2011

math
solve by the elimination method: 9x-9y=18 7y-3x=-8 please solve step by step thank you for your help
July 25, 2011

chemistry
Calculate the number of moles of FeSO4 in 25cm3 of a 0.2mol dm3 solution
June 21, 2011

Chemistry
A gas has a volume of 50.0 cm3 at a temperature of -73°C. What volume would the gas occupy at a temperature of -123°C if the pressure stays constant
June 12, 2011

math
The best answer is D - 6. The two negatives cancel each other out, making the sum 18 divided by 3, equaling 6.
May 20, 2011

college chem
The cation M2+ reacts with NH3 to form a series of complex ions as follows: M2+ + NH3 M(NH3)2+ K1 = 102 M(NH3)2+ + NH3 M(NH3)2 2+ K2 = 103 M(NH3)2 2+ + NH3 M(NH3)3 2+ K3 = 102 A 1.0 × 10–3 mol sample of M(NO3)2 is added to 1.0 L of 15.0 M NH3 (Kb = 1.8 × 10&#...
April 24, 2011

physics
What is the average current through a conductor that carries 4 375C during a 2 min time period?
April 13, 2011

english
What opinion might they have of the author? What could you as a writer do to prevent this problem?
March 28, 2011

english
How might readers react if the topic sentences in an essay did not coincide with the supporting points, and why would their reaction be justified?
March 28, 2011

Direct verse indirect cost Estep Construction Company is composed of two divisions: (1) Home Construction and (2) Commercial Construction .The Home Construction Division is in the process of building 12 houses and the Commercial Division is working on 3 projects. Cost items of...
March 26, 2011

chem101
propyl Bromide reacts with Mg, Propanone, H+ to yeild what?
March 26, 2011

chem101
Hydrogen gas can be produced in the lab by the reaction of magnesium metal and hydrochloric acid. Mg + 2 HC -> MgCl2 + H2 How many grams of hydrogen gas will be produce if 5.00 g of magnesium metal is dissolved in excess acid.
March 24, 2011

The world History
where are the questions to assignments 1-5 world history number007678
March 6, 2011

chem
What is the [OH-] for a solution at 25°C that has [H3O+] = 8.23 × 10-2 M?
March 5, 2011

Chemistry
What volume of dry hydrogen would be produced under standard consitions when 0.250g of magnesium reacts with excess HCl?
February 23, 2011

Math
The surface area of a cylinder is 200cm. The diameter is equal to the height. Find the radius.
February 20, 2011

Math
The surface area of a cylinder is 200cm. The diameter is equal to the height. Find the radius.
February 20, 2011

Math
Do the equations x = 5y + 3 and x = 5y – 3 have the same solution? How might you explain your answer to someone who has not learned algebra?
February 8, 2011

algebra
what are the coordinates of the points at which the slope of the function with the equation y = x^4 - 8x^2 is equal to zero ?
December 27, 2010

physics
Two boxes are similar. The larger box has a volume that is 64 times the volume of the smaller box. What is the ratio of the larger box's height to the smaller box's height? write the fraction as a decimal
December 11, 2010

What is a number sentence that shows the same product as the product of 9 and 2
December 9, 2010

chem class
A 25.00-mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 10.0 mL of KOH is ???? M.
November 23, 2010

comp
what is the verb tense in this sentence? Education is contributing a good role of successful financial planning.
November 20, 2010

Microeconomics
opportunity cost of taking this trip is tavel accomandations
November 14, 2010

each european group that set up colonies settled in a specific part of americas fact
November 7, 2010

1/m-m/2=6X+5/12
November 5, 2010

Physics Lab I
Let's say you measure an average acceleration to be 0.4134 ms-2. What is the height (in centimeters) of the riser block? Assume the legs of the track span 1.0000 m and that there is neither friction nor drag. Also assume the block is under one of the legs. ?? cm Use three ...
November 3, 2010

Hi! is my answer correct? Consider the following chemical reaction: H2 (g) + I2 (g) <> 2HI (g) At equilibrium in a particular experiment, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. The value ofKeq for this reaction is I solved by...
October 25, 2010

we have a ring that has an indian head marking on the inside of the ring, do you know what it means, who made it, how old it is, or what its actually called so we can search the meaning ?
October 22, 2010

what are 4 possible tune-ups to help you keep a postive attitude?
October 18, 2010

math
f(x)=ax+b f(-2)=27 and f(1)=15 find the value of x when f(x)=-5 how do you work this out?? thanks so much
October 13, 2010

A square made by a length of string 8 cm long is reshaped into a circle. What is the circumference of the circle
September 24, 2010

Physics
A chain composed of four identical links is suspended by a rope and does not move. What are the forces on each chain? (include where they come from)
September 20, 2010

accounting
There is also a lot of companies that report their federal taxes using the accrual basis and their state taxes on the cash method. Why do you think a company would want to do this?
September 12, 2010

college physical science
how much would a 80.0kg person weigh on earth where the acceleration of gravity is 1.63m/s2
September 6, 2010

college physical science
how much would a 80.0kg person weigh on mars if the acceleration of gravity is 3.93m/s2
September 6, 2010

college physical science
According to table 1.3, what volume of iron would be needed to balance a 1.00cm3 sample of lead on a two pan laboratory balance? Table 1.3 shows densities g/cm3 such as iron=7.87g/cm3 and lead is 11.4g/cm3
August 29, 2010

Physical Science
A cubic tank holds 1,000kg of water. What are the dimensions of the tank in meters. Explain your reasoning.
August 29, 2010

Physics
Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics?
July 1, 2010

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...
July 1, 2010

Chemistry
A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and ...
June 30, 2010

Chemistry
A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and ...
June 29, 2010

Physics
How does one Coulomb of charge compare to the charge on an electron? How do you think such a large difference arose historically?
June 25, 2010

Physics
Where should most of the mass be for an industrial fly wheel? Why? can't find any thing about this in my book. need help answering this.
June 18, 2010

math
Hi, the £ is pound sterling and p is pence, so can be swapped for \$ and c/
June 16, 2010

math
I am an odd multiple of 50p. My number of £s is double 18. What am I?
June 16, 2010

Physics/ Science
How does a derivation differ from an experiment or a theory?
May 29, 2010

Physics
Having trouble determ the formulas for the follow problems. 2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go? 60 km 3. At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds. During these two seconds, how far does it...
May 29, 2010

physics
An object 7.25 cm high is placed 15.1 cm from a convex mirror of radius 55.2cm. (a) What is the image distance?
May 24, 2010

math
3/5 + 1/10=? i got 7/10 or 12/20, which one is correct?
May 18, 2010

music
2. What role did Totalitarianism play in the creation of music particularly in Germany and the Soviet Union during the twentieth-century? Which composers were most affected by totalitarianism? How did affect their lives?
May 14, 2010

reply to Q " Physics hard... can't get it right"
kk this is what i did V=strt(3*k=8.31*T=1365)/m=5.32*10^-26
May 6, 2010

Physics hard... can't get it right
oo ok let me try that also can you tell me the distinction like when to use gas constant and boltzmann constant
May 6, 2010

Physics hard... can't get it right
strt(3 * k=8.31 * T=1365)/ m = 5.32*10^-26
May 6, 2010

Physics hard... can't get it right
A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of Oxygen is 32 g/mol. ...
May 6, 2010

Physics hard...
Young's Modulus (Y) 20 X 1010 N/m2 Shear Modulus (S) 8.1 X 1010 N/m2 Bulk Modulus (B) 16 X 1010 N/m2 The table to the above represents various properties of steel. You have steel wire 4.9 meters in length that stretches 0.16 cm when subjected to a force of 400 N. What ...
May 6, 2010

physics
A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of Oxygen is 32 g/mol. ...
May 6, 2010

trig
Graph three periods of the function. (identify period and phase shift and intercepts) y = f(x) = √3/2 sin(2x) - 1/2 cos(2x) if you can't graph it can you at least get it into that simpler form which is graph able.
May 5, 2010

trig1 more question
it is always true that if -1 ≤ x ≤ 1 then cos(Arccos(x)) = x Give an example showing that Arccos(cos(x))= x need NOT be true for all x
May 4, 2010

Trigonometry
Find all solutions for the following equation in the interval 0 ≤ x <2pi 3cos(3x)=6 i got cos3x=2, don't know how to go further i think it would be no solution but just want to confirm.
May 4, 2010

physics
20meters
May 4, 2010

Government
How can the actions of urban elites help explain the Great Recession?
May 1, 2010

social studies
Why did Mao Zeodong led the cummunists to power in china
April 22, 2010

Math
The width of a rectangle is fixed at 16 cm. What lengths will make the perimeter greater than 78cm? Would the answer be 23 because 16*2+23*2=78cm or would the answer be 24. Because the perimeter is greater than 78cm
April 8, 2010

Math
thank you
April 8, 2010

Math
Media service charges \$20 for a phone and \$30/month for its economy plan. The equation c=30t +20 describes the total cost,c, of operating Media Services phone for t months. A) The total cost for 8 months of service is? My answer \$260 If a customer has only \$90 available, how ...
April 8, 2010

Math
Thank you for the help.
April 7, 2010

Math
Trains A & B are traveling in the same direction on parallel tracks. Train A is going 60mph and Train B at 80mph. Train A passes a station at 6:25 am. If Train b passes the same station at 6:37, what time will B catch up with A? The answer I received is: 7:03am, is that correct?
April 7, 2010

Express versus Implied Contracts. Suppose that a local businessperson, McDougal, is a good friend of Krunch, the owner of a local candy store. Every day on his lunch hour McDougal goes into Krunch¡¦s candy store and spends about five minutes looking at the candy. ...
March 15, 2010

chemistry correction
1. Which two elements react vigorously with each other? A: Chlorine and lithium B:Chlorine and potassium C:iodine and lithium D:iodine and potassium my answer is B 2. which statement about electronegativty is correct. A: Electronegativity decrease across a period. B:...
March 11, 2010

Math
The exhibit hall at the fair is dividid into three sections. Tow-fifths of the exhibits are in section B of the hall, and another two-fifths ain in section C. What fraction of the exhibits are in located in section A? We have multiple choice answers. Thank you
March 1, 2010

chemistry
1.Use the Vsepr theory to predict and explain the shape and bond angle of each of the molecules SCI2 and C2CL2. 2.Deduce whether or not each molecule is polar, giving a reason for your answer...Any help please??
February 28, 2010

chemistry
.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces.
February 26, 2010

chemistry
1.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces. 2. The element sodium, aluminum, silicon, phosphrous, and sulfur are in periods 3 of the periodic table. Decribes the metallic bonding present in ...
February 26, 2010

COM/155
February 17, 2010

chemistry
What will be the mass in grams of hydrogen atoms (only) that will be present in 22.2 g of compound A (XH3)?
February 1, 2010

Math
dx can't be zero
February 1, 2010

chemistry
Magnesium reacts with HCl(aq) to form MgCl2 and H2(g) ____ Mg(s) + ____ HCl(aq) -----> ____ MgCl2(aq) + ____ H2(g) The following data was collected for the above reaction: Mg (g) 5% (m/v) HCl (ml) H2 gas produced (ml) 0.50 10 167 0.50 20 333 0.50 30 500 0.50 40 500 0.50 50 ...
January 29, 2010

chemistry
The actual chemistry question was, given that there are 4.19 g of C6H6 how many moles do you have and this is how I solved it and it was wrong. 4.19g/78g/mole = .054 moles of C6H6
January 23, 2010

chemistry
How many moles are in 13grams of C6H6. should this question be broken down into its imperical formula (CH)6 and calculate the number of moles of CH and multiply by 6 or calculate the gram molecular wt of C6H6 and divide it into 13 grams? I took 13 grams and divided it by the ...
January 23, 2010

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