Saturday

February 13, 2016
Total # Posts: 631

**Chemistry**

(a) Which of the ions K+ , Na+ , Be2+ will have the largest heat of hydration? Which the smallest? (b) Of the two compounds KNO3 and NaNO3 , which has the stronger intermolecular forces? (c) Of the two compounds PCl3 and Xe, which has the stronger intermolecular forces?
*December 5, 2011*

**Statistics**

its a worksheet where i have to do the hypothesis tests though.
*December 3, 2011*

**Statistics**

Hi. I need to complete hypothesis tests and i am unsure if i used the correct tests for each of the following: 1. Do people actually prefer Pepsi or Coke in a taste test? 2. Can people correctly identify Pepsi versus Coke? 3. Are people consistent with their prior preference? ...
*December 3, 2011*

**trig**

for what values of theta between 0 and 2 pi is the function of theta equal sine theta positive?
*November 30, 2011*

**Superglue fuming--fingerprints **

What is an amino acid? Why do they cause superglue to stick to my fingerprints on a cd when I place the cd in a plastic box covered with plastic wrap? I'm 9, so I really need just a simple answer. Thanks.
*November 7, 2011*

**Chemistry**

How many molecules (not moles) of NH3 are produced from 8.92×10−4 g of H2?
*November 6, 2011*

**math**

out of 150 students, 20% of them earned straight A's. how many students earned straight A's?
*November 3, 2011*

**math**

determine the value of N: N/20 * 100%=60%
*November 1, 2011*

**Math**

There are 80 students 35 of them are boys about what percent are boys
*October 30, 2011*

**Math**

Thanks
*October 23, 2011*

**Math**

Which of the following is NOT proportional? A)4/10 = 6/15 B) 2/1 = 30/15 C) 5/25 = 4/24 D) 63/90= 70/100
*October 23, 2011*

**jlc**

Three is the first number of pair and 8 is second if 50 is first number what is second number?
*October 20, 2011*

**4th grade math**

you simply have to write it out. So first one the expression would be 1285-622 because have to find the difference between the two numbers.
*October 18, 2011*

**geometry**

The way to work out this problem is that you do the lXhXw so width times the height times the length so 6 times 6 times 6= 216. 5th grader by the way.
*October 18, 2011*

**7th grade subject**

you simply must chose whether which one makes sense so I would go with5-3=2
*October 18, 2011*

**Proof read please**

You should divide the paragraphs so it will look a whole lot neater. Rather than that I think it's good.
*October 15, 2011*

**English**

take out ( ).
*October 15, 2011*

**physics **

suppose an experimental arrangement like the one in part 2 has mass m1= 0.200kg at the 0.100m mark and a mass m2=0.100 kg at 0.750m mark. Can the system be put in equilibrium by a 0.050kg mass? if it can not be done state where it would be placed. If it cannot be done, state ...
*October 13, 2011*

**Chemistry**

Thank you so much for the help on my other question!!! An alloy (solution of metals) is 80% by volume iron. The rest is aluminum. Aluminum has a density of 2.70 g/cm³, and iron's is 7.87 g/cm³. A block of alloy measures 2.0 ft. wide and 3.0 ft. long. If the block...
*October 8, 2011*

**Chemistry**

An aqueous solution of copper (I) chloride is 15.7% by mass copper (I) chloride. Copper (I) is 35.8% by mass chlorine. If the solution has a density of 1.045 g/cm³, how many gallons of solution contain 2.3 kg of copper?
*October 8, 2011*

**College Math**

I am really struggling with this Fibonacci number problem. If the greates common factor of "m" and "n" is "r", then the greatest common factor of Fm and Fn is Fr. Show that this is true for m=6 and n=9. I am so confused
*October 2, 2011*

**math**

there are two planes. they both leave the airport at 1pm. one plane travels north at 150mph and the other plane travels west at 200mph. how many miles will they be apart at 3pm?
*September 28, 2011*

**Algebra**

19[7+w+(-2)]
*September 26, 2011*

**Algebra**

How far in miles is a line of 1,000,000 pennies. Please show chart with 5 instances. Define a variable and write an algebraic expression.
*September 11, 2011*

**calculus**

Find the derivative of the function. 1. 2x+5/3x-2 2. (1-x)(1+x^2)^-1 Please show work. TYVM. :)
*September 11, 2011*

**physics**

A plane flying horizontally at 50 m/s is 2000m from its target. a)At what height must a projectile be released in order to strike the ground target. (neglect air resistance) b)At what velocity will the projectile strike the target? c)What is the angle of impact with respect to...
*September 11, 2011*

**physics**

A rocket is fired at 1500 m/s at an angle of 50 degrees with respect to the ground. a)What are the horizontal and vertical velocities at 10 seconds. b)What is the actual velocity at 10 seconds.
*September 11, 2011*

**Matthews**

rays pq and qr are perpendicular. point s lies in the interior of <pqr. if m<pqs = 4x + 7 and m<sqr = 9 + 4a, find m<pqs and m<sqr
*September 5, 2011*

**economics**

Assume that it takes four hours of labor time to paint a room and three hours to sand a floor. If all 24 hours were spent painting, how many rooms could be painted by one person? If a decision were made to sand two floors, how many painted rooms would have to be given up? ...
*June 15, 2011*

**science**

how can pollution start in the Blue Ridge region affect the habitat of a tadpole living in the Piedmont region (think about the watershed)
*June 2, 2011*

**Algebra**

Can i get some help simplifying this fraction? ((x+5)/(x)) / ((x+5)/(2x))
*May 21, 2011*

**algebra**

The height above the ground of a ball thrown up with a velocity of 96 feet per second from a height of 6 feet is 6+96t-16^2 feet, where t is the time in seconds. According to this model, how high is the ball after 7 seconds? Explain (Thank you in advance! :)
*May 4, 2011*

**physical science**

list two safety procedures to create a supersaturated solution
*May 3, 2011*

**Chemistry**

I need to know how to right a net ionic equation for the following chemical reaction: 5 H2C2O4 + 3 H2SO4 + 2 KMnO4 = K2SO4 + 2 MnSO4 + 8 H2O + 10 CO2
*April 14, 2011*

**Calculus I**

Using Newton's Method, determine the first approximation to the solution of: e^(4x)= 10-2x starting with x=0 what is x1= ??? P.S. ( the 1 is a subscript )
*April 8, 2011*

**language arts**

from the following words I got to separate them into 3 groups: omitted syllable, omitted letter, and added syllable. drowned, restaurant, ivory, chocolate, desperate, lightning, adjective, penetrate, aspirin, athletes, identity , sisastrous, ecstatic, platinum, incidentally ...
*April 7, 2011*

**Physics 203 ( College)**

Tangential acceleration is the instantaneous linear acceleration associated with the particle at distance (r) from the center of rotation. thus Centripetal Accel= (angular accel)(r)
*April 4, 2011*

**Physics**

When friction is used to counteract centrifugal force, the side friction factor, f, between the tires and roadway is incorporated into the calculation for the superelevation angle. (the angle of road banking where friction is not needed) tan@=[(Vt)^2-(f)(r)g]/[(r)g+f(Vt)^2] (...
*March 29, 2011*

**physics**

An unstable atomic nucleus of mass 17.0 ¡Ñ 10¡V27 kg which is at rest disintegrates into three particles. One of the particles, of mass 5.00 ¡Ñ 10¡V27 kg, moves in the y direction with speed 4.50 Mm/s. Another, with mass 8.40 ¡&...
*March 28, 2011*

**algebra**

a sphere has a diameter of 6x cen write an expression to represent the volume of the sphere in terms of pie
*March 24, 2011*

**Chemistry**

What is the volume of 0.129 M HCl(aq) re- quired to neutralize all of the hydroxide ions in 46 mL of 0.216 M KOH(aq)? Answer in units of mL. Answer: 77.0232 What is the molarity of Cl− ions at the stoichiometric point? Answer in units of mol/L. What is the pH of the ...
*March 23, 2011*

**calculus**

find an equation of the curve that satisfies dy/dx=4x^3y and whose y-intercept is 7
*March 19, 2011*

**separation of variables**

solving the initial value problem by separation of variables dy/dx=(4(sqrt of y)lnx))/x, y(e)=9
*March 19, 2011*

**Geometry**

The sum of the measures of the angles of a polygon with n sides is given. Find n. 32) 180 33) 1080 34) 1980 35) 2880
*March 17, 2011*

**Math**

How to change 320% into a decimal and a fraction
*March 9, 2011*

**math**

patterns and equations: x: 0,3,__,10 y: __, 8, 12,15
*March 3, 2011*

**math**

150 = 25p
*March 2, 2011*

**History**

would an Egyptian style revolution beneficial or detrimental to the US government?
*February 22, 2011*

**geometry**

Angle GHJ and Angle IHJ
*February 22, 2011*

**math**

adding fractions with unlike denominators: 7/9 + 5/6?
*February 16, 2011*

**Geometry**

Given ABCD is a square AC= BD = 4 units Ac= BD pass origin of (0,0) Find coordinates of A B C D
*February 11, 2011*

**geometry**

Given ABCD is a square AC = BD = 4 units Find coordinates of ABCD
*February 11, 2011*

**Physical Science**

Suppose you dissolve 40g of potassium nitrate in 100 cm3 of water at 100 C. If half the solution os poured out, how many grams of potassium nitrate will the remaining solution contain?
*February 7, 2011*

**3rd grade math hw help!**

explain why 2/3 is greater than9/12
*February 3, 2011*

**math**

The area of a parallelogram is 100 square millimeters. The base is 4 milimeters. Find the height.
*February 3, 2011*

**Probability and Statistics**

The number of calls that arrive under a particular time in a cell has been established to be a Poisson distribution. The average number of calls arriving in a cell in 1 millisecond is 5. What is the probability that 8 calls arrive in a cell in a given millisecond?
*February 1, 2011*

**math**

find the volume of the rectangular prism: base area 56 in2, height 6 inches
*January 31, 2011*

**physics**

For the height you can use these two formulas: t=(Vi sin A)/g H=(Vi sin A)t - (g/2)t^2
*January 29, 2011*

**gcse biology**

who discovered dna? was it friedrich miescher,francis crick and james watson or rosalind franklin???? in know someone asked the same question yesterday but im still stuck any help would be great thankyou.
*January 18, 2011*

**9th grade alegbra**

a sphere has a diameter of 6x cen write an expression to represent the volume of the sphere in terms of pie
*January 11, 2011*

**Physics 30**

The activity of a sample of a radioactive isotope is 1800Bq. If this isotope has a half-life of 16 days, what is the activity after 16 days?, 24 days?, and 60 days?
*January 9, 2011*

**differentiability**

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f prime of x equals (x2-4)*g(x), which of the following is true? A. f has a relative maximum at x=-2 and a relative minimum at x=2, B. f has a relative minimum at x=-2 and a relative ...
*December 31, 2010*

**us history**

what would teddy roosevelt put in a time capsule if needed to?
*December 12, 2010*

**math**

subtracting fractions with different denominators. Change answer to simplest form: 3/9 - 1/4
*December 9, 2010*

**math**

1/2 + 2/5 in simplest form?
*December 8, 2010*

**6th grade**

You take -5 and subtract that by 17 which you get the answer 12.
*December 7, 2010*

**physics**

200 = .5gt^2 = 6.39s
*December 6, 2010*

**science**

is there a formula i can use to determine the diameter of the ball or the percentage of size reduction? The ball has a diameter of 8.5 inches and is inflated to 7 lbs. at 0 depth
*November 28, 2010*

**science**

what happens to a soccer ball underwater at a depth of 50 feet?
*November 28, 2010*

**Physics**

A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 101 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)
*November 27, 2010*

**social studies**

Hi I am in grade 9 social studies, and I dont understand the part of this assignment it is a ch.2 english cival war and democracy. I do want full marks on this assignment okay, or else I will get a c or an f minus.
*November 16, 2010*

**Math**

2nd grade math question. Kara's shirt has 3 more tens than ones. The value of the ones is greater than 4 and less than 6. What is the number?
*November 10, 2010*

**Statistics**

How do you construct a frequency distribution table for the indicated data set? Month Precipiation (inches) January 2.01 February 2.08 March 2.39 April 2.85 May 6.21 June 9.33 July 5.70 August 7.58 September 7.63 October 5.64 November 2.66 December 1.83
*November 10, 2010*

**Algebra-Reiny please check**

How can the LCD be 4x^2 when you have two (2x^2) as two of the denominators?
*November 9, 2010*

**Algebra-Please help me**

Could you please show me how to solvethis: x+6/4x^2 + 3/2x^2 = x + 4/2x^2 Please show me the steps-I don't even know where to start and I have 30 of these for homework Thank you
*November 9, 2010*

**Statistics**

a)One game in a state lottery requires you to pick 1 heart, 1 club, 1 diamond, and 1 spade, in that order, from the 13 cards in each suit. What is the probability of getting all four picks correct and winning $5000 b)If three of the four selections in part (a) are correct, the...
*November 8, 2010*

**drawing**

a)One game in a state lottery requires you to pick 1 heart, 1 club, 1 diamond, and 1 spade, in that order, from the 13 cards in each suit. What is the probability of getting all four picks correct and winning $5000 b)If three of the four selections in part (a) are correct, the...
*November 8, 2010*

**English**

I'm writing an essay on the short story, The Bouquet. It's a essay on the character of Mary Myrover. Tell me what you think... =D Mary Myrover is Charles W. Chesnutt's major character in the short story, "The Bouquet". She is a prideful, southern white ...
*November 2, 2010*

**geometry**

Find the value of x Show work 3x _ = x+15 2
*November 2, 2010*

**English**

Hmmm. Still cant can't think of anything. Please help ASAP. :)
*November 2, 2010*

**English**

I'm writing an essay on the short story, The Bouquet. It's a essay on the character of Mary Myrover. Tell me what you think... =D Mary Myrover is Charles W. Chesnutt's major character in the short story, "The Bouquet". She is a prideful, southern white ...
*November 2, 2010*

**College Physics**

its maximum displacement is also its Amplitude. When an object is in SHM and reaches its A, its velocity is zero.
*October 24, 2010*

**6th grade**

What are the d themes of geography ,
*October 17, 2010*

**art**

draw picture
*October 17, 2010*

**English**

What concerns does Omi and Winant’s theory of “racial formation” share with Bell Hooks’ critique of postmodernism? How might Omi and Winant’s concept address hooks’ concerns about what is lost when we reject essential identity?
*October 16, 2010*

**algebra honors**

determine whether each set of ordered pairs is a function {)(0,1),(1,-1),(5,-1),(-1,)}
*October 5, 2010*

**Math**

The graph of any quadratic function can be drawn from the vertex form of the equation, by performing 1,2,3,or 4 transformations on the graph of f(x) = x sqaured
*October 3, 2010*

**science**

what is ecrfenine unscrambled
*September 27, 2010*

**Physics**

y = .5gt^2 160 = .5gt^2 = 5.71s
*September 21, 2010*

**physics**

160 = .5gt^2 = 5.7s
*September 21, 2010*

**physics**

125 = .5gt^2 = 5.1s
*September 21, 2010*

**Algebra**

Determine if the following two planes 2x+3y-z=4 and 3x-4y-6z=1 are parallel, orthogonal or coincidental
*September 21, 2010*

**Science**

What is it called when scientists do their experiments more than once to reduce chance errors?
*September 13, 2010*

**calculus**

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the y-axis. y=4/x, y=0, x=2, x=3 I know you have to integrate from 2 to 3 but im not sure what the integral should be
*September 9, 2010*

**Calculus**

Use cylindrical shells to find the volume V of a right circular cone with height 7h and base radius 4r.
*September 9, 2010*

**Math**

How is the number of zeros in the quotient in 180 divided by 8 equals 20 related to the bumber zeros in the dividen?
*September 8, 2010*

**Math**

The Energy formula is (f(t))^2 dt over the integral from t2 to t1. However, I don't know how to utilize it in this case.
*September 8, 2010*

**Math**

f(t)=A[u(t)-u(t-10)], where u(t) is the unit step function. Is the energy of this signal finite? Why or why not? If it exists, find the energy of this signal.
*September 8, 2010*

**Science**

A pallet of boxes weighing 10 tons is dropped from a lift truck from a height of 10 feet. The maximum velocity the pallet attains before hitting the ground is 6 ft/s. How much kinetic energy does the pallet have in (ft)(lbf) at this velocity?
*August 31, 2010*

**social studies**

what are types of land and waterways also known as? Physical features or landforms?
*August 24, 2010*