Saturday

September 5, 2015
Total # Posts: 49

**Chemistry**

We were testing standard solutions of Cu(NO3)2 and a filtrate of Cu(NO3)2 using a spectrophotometer and all of the absorbances recorded were higher than what they were predicted to be. Why might this be?
*August 14, 2015*

**Physics**

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 76.7 m/s2 for 1.89 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) ...
*August 12, 2015*

**math**

What function would have a zero at sqrt2?
*April 28, 2015*

**Algebra**

you estimate a building is 20 meters tall but it actually 23 meters what is the difference in percent?
*January 27, 2015*

**Science 8 - Check Answers**

Thank you!
*November 14, 2014*

**Science 8 - Check Answers**

Please Check Answers. 4. When a fan is turned on, it changes electrical energy into ______ energy. A. motion * B. magnetic C. gravitational D. electromagnet 5. An experiment discovered that a particular material was a poor conductor of electricity. This material would most ...
*November 14, 2014*

**algebra**

Taylor's nickels and dimes total $7.60. If the nickels were replaced by pennies then she would have $6.80. How many of each coin does she have?
*April 9, 2014*

**Algebra**

what is x when x=.10(100-x)
*March 11, 2014*

**Algebra II**

Nevermind, I got it! ^.^
*October 25, 2013*

**Algebra II**

What is an equation for a direct variation whose graph passes through the point (–5, 3)?
*October 25, 2013*

**Science Physics**

Ms. Sue could you please explain this to me. Imagine you need to deliver a piano over three steps. A longer ramp translates into less force necessary to raise the piano's height than a shorter ramp would require. Calculate the percentage smaller a force would be required ...
*September 5, 2013*

**Math**

work!!!
*January 8, 2013*

**stats & prob.**

Given the values of n=5, p= 0.15, and (1-p)=0.85, calculate the standard deviation of the data.
*November 27, 2012*

**philosophy**

How do value judgments cloud discussions of the legitimacy of violence in a political system
*April 30, 2012*

**Chemistry**

50.00 mL of OOH was diluted to 250.0 mL with deionized water. In the determination of the total cation concentration, 25.00 mL aliquots of the dilute OOH were passed through a cation exchange column and the eluent titrated with an average 27.42 mL of 0.1134 M NaOH. In the ...
*January 26, 2012*

**Chemistry**

4536
*January 8, 2012*

**math**

In each game of marbles a loser gives the other player a marble when they finish jane won 15 times, and kathy has 22 more marbles than when she started how many games did they play
*September 19, 2011*

**Maths **

y= ae^(bt)sin(kt) Use a sine regression to determine k, the period of oscillation of this system. State the regression equation and superimpose its graph on that of the data set. help?
*June 5, 2011*

**Chemistry**

Calculate the amount of sodium acetate trihydrate needed to prepare 100 mL of 0.2M sodium acetate solution.
*April 26, 2011*

**Chemistry**

What is the osmotic pressure(in torr)of a 0.0015 M NaCl at 25 degrees celsius? (R= 62.4 L*torr/mol*K) Please show me how to set up the equation.
*February 25, 2011*

**chemistry**

thanks very much for your help, have a bless evening
*February 25, 2011*

**chemistry**

What volume of 0.200 M silver nitrate solution (AgNO3) would have to be diluted to form 500mL of 0.050 M solution?
*February 25, 2011*

**physics**

A person in an elevator is holding a 13 kg block by a cord rated to withstand a tension of 226 N. When the elevator starts up, the cord breaks. What was the minimum acceleration of the elevator?
*December 16, 2010*

**physics**

A person in an elevator is holding a 13 kg block by a cord rated to withstand a tension of 226 N. When the elevator starts up, the cord breaks. What was the minimum acceleration of the elevator?
*December 16, 2010*

**chemistry**

Home many drops of 0.1M HCl is needed to neutralize 10mL of 1M NaOH?
*August 14, 2010*

**statistics**

A sample of 40 observations is selected from one approximately normal population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second source. The sample mean is 99 and the standard deviation is 6. Conduct a ...
*May 29, 2010*

**ALGEBRA**

i don't know
*February 24, 2010*

** ENVIRONMENTAL SCIENCE **

A viewpoint in the video that I saw was that we need to preserve nature and all the living species in it, each species has its importance in this world. If we do not than we are potentially losing out on things that could benefit humans like scientist Tom Eisner has done in ...
*January 19, 2010*

**Operation management**

14a. Determine the placement of departments for a newly designed facility that will minimize total transportation costs using the data in the following tables. Assume that reverse distances are the same. The locations are shown in the grid. Use a cost of $1 per trip yard. ...
*November 28, 2009*

**maths**

3(2f+4)- expand the bracets
*November 3, 2009*

**Calc**

A plane that is flying horizontally at an altitude of 6 kilometers and a speed of 680 kilometers per hour passes directly over a radar station. How fast is the distance between the plane and the radar station increasing when the distance between the two is 9 kilometers
*October 20, 2009*

**calculus**

At noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 25 knots and ship B is sailing north at 16 knots. How fast (in knots) is the distance between the ships changing at 7 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)
*October 20, 2009*

**science**

what things contain alkali that would be kept in your house
*October 14, 2009*

**9th grade algebra**

decide whether the graphs of the two equations are parallel lines. a. y=3x+2, y=1/3x+4 b. 3y=15x+4, y=5x+1
*October 5, 2009*

**9th grade algebra**

I suppose..
*October 5, 2009*

**Algebra**

WHAT IS THE ANSWER OF : 7x^2+39x+20 WHEN IT IS FACTORISED
*June 11, 2009*

**resistant materials**

What is pine?
*February 8, 2009*

**math**

how do u do this 60 divided by 8h
*November 12, 2008*

**Science**

What Acids Or Alkalis Do You Find Round The House ?
*November 9, 2008*

**Science**

I am confussed about diffusion in liquids can u explain it plz?
*December 4, 2007*

**Science**

I need help writing a procedure for my Earth Science class. Our teacher gave us 5 minerals and told us 5 mineral names, but we have to figure out which is which. We could do tests like specific gravity, luster, streak, and hardness. I decided to do hardness and streak. I wrote...
*October 14, 2007*

**Math and Science**

i cant sticccck h/w help!!!!!
*October 14, 2007*

**Physics- really fun!**

okay so i lied, it's not fun, sorry. pressure gradient-why can't submarines go to the bottem of the ocean? Thank you for using the Jiskha Homework Help Forum. but posting so close together with the SAME question is considered "flooding." It is worth reposting...
*May 7, 2007*

**HELP PLEASE! Physics!**

SO CONFUSED!!! Why can't submarines go to the bottem of the ocean? It is to do with pressure gradient Total nonsense. Subs go to the bottom of the ocean each time they sink. Now if there is an inversion layer, either thermal or salinity, they can "float" on that ...
*May 7, 2007*

**Physics**

I hope someone can help me, cause i am so confused. Pressure gradient-why can't submarines go to the bottem of the ocean? please help! Stop the multiple posts. I am a volunteer, and it is a waste of time to go thru the same posts.
*May 7, 2007*

**AP BIO**

Could you give me any information on fruit flies. We did a huge lab on the genetic ratio of wildtype fruit flies to mutant apterous (wingless) flies. Im doing a paper on it and i cant find enough information I don't know what information you have already found. However, ...
*April 15, 2007*

**math**

0.15 percent of 12 trillion Times 12,000,000,000,000 by .0015 to get 18,000,000,000
*January 29, 2007*

**science**

i am doing the exact same thing aswell in science!!! and its due tomorrow and dont know how to do it :/
*October 20, 2006*

**Statistics**

you had the first question! congrats!
*June 13, 2005*

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