karl
Popular questions and responses by karl
Chemistry
In a lab, we added NH3(aq) to CuSO4(aq), and the solution turned dark blue with a precipitate. The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? The question is then, what is the percipitate? The ppt is Cu(OH)2. The dark blue
asked on December 17, 2006 
physics
A shuffleboard disk is accelerated to a speed of 5.6 m/s and released. If the coefficient of kinetic friction between the disk and the concrete court is 0.29, how far does the disk go before it comes to a stop? The courts are 15.7 m long.
asked on September 26, 2012 
Chemistry
Quick question, since FePO4 is insoluble, will that mean a precipitate will form? During the experiment I don't remember seeing a precipitate. Is that my error, or is the precipitate hard to see? Sure. Adding Na3PO4 will make a big difference. FePO4 is
asked on December 17, 2006 
physics
A box, open at the top, in form of a cube of edge length 40 cm, is constructed from a metal plate. Find the coordinates of the center of mass of the box with respect to x, y, and z coordinate system.
asked on October 10, 2011 
physics
Suppose a rope of mass m hangs between two trees. The ends of the rope are at the same height and they make an angle θ with the trees. (a) What is the tension at the ends of the rope where it is connected to the trees? Express your answer in terms of m,
asked on October 8, 2013 
geometry help
a trapezoid has base lengths of 4 and 19 feet, with an area of 115 square feet. what is the height of the trapezoid?
asked on June 1, 2011 
determining speed
car leaves a 20 ft. skid mark how fast was the car traviling
asked on January 12, 2011 
Social Studies
How were the carpetbaggers able to influence freed slaves in the south? A. They gave them land and helped them start farms. B. They took advantage of their inability to read and write. C. They promised them highpaying jobs in the newly elected government.
asked on April 5, 2016 
History
Which of the following tools of the Archaic culture was primarily used for hunting birds and smaller prey? A. atlatls B. game nets C. bird stones D. grinding stones
asked on September 14, 2015 
trigonometry
A barge is being towed south at the rate 2 km/hr. A man on the deck walks from west to east at the rate 4ft/s. Find the magnitude and direction of the man's actual velocity.
asked on August 7, 2014 
algrebra 2
how to find the xintercept and y intercept 5y=15x90
asked on September 19, 2010 
Math
Gus has a checking account balance of $75. His bank will fund the a debit card purchase that creates a negative balance up to a limit of $200, but charges a $35 fee per transaction for any purchase made in overdraft. Gus made a purchase of $100 yesterday,
asked on February 10, 2020 
jkuat
find log30 if log2=0.301 and log3=o.477
asked on October 5, 2016 
maths
i am a mutiple of 5 ,but not a mulitple of 10.my units and hunderde are the same.the sum of my three digits is 11,what am i
asked on October 18, 2012 
psychology
Psychologists are interested in people's behavior and their mental processes. Psychologists believe that: behavior is impacted by environment, but not by a person's physical state. behavior is affected by a person's mental and physical state, but rarely by
asked on October 28, 2010 
physics
On the surface of the Moon, a ball is thrown horizontally, with a speed of 15 m/s, from the top of a 6 m tall hill. How far from the point on the ground directly below the launch point does the ball strike the ground? (On the Moon, the acceleration due to
asked on September 20, 2011 
trigonometry
A box of 200kN is placed on a smooth inclined plane 28° with the horizontal. To prevent the box from sliding down the plane, a rope is tied to it and fastened to a peg on the top of the incline as shown. Determine the pull on the string assuming that the
asked on August 7, 2014 
calculus
find 3 positive real numbers whose sum is 500 and whose product is as large as possible.
asked on October 28, 2013 
chemistry
Using the Le Chatelier's principle, predict the direction of the net reaction in each of the following equilibrium systems, as a result of increasing the pressure at constant temperature. a)N2(g) + O2(g) ==> 2NO(g) PCl3(g) + Cl2(g) COCl2(g)
asked on June 14, 2010 
Pre cal
A parallelogram has sides of lengths 7 and 4, and one angle is 55°. Find the lengths of the diagonals. (Round your answers to two decimal places. Enter your answers as a commaseparated list.)
asked on November 15, 2015 
Math
Sherry saved $1800 she earned at her summer job. She invested part of her money in a Treasury Bill at 5% and the balance in a Money Market fund which guaranteed a return of 10%. If she earned $165 on her investments in the first year, how much was invested
asked on September 24, 2015 
physics
A motorcycle and 66.0 kg rider accelerate at 2.0 m/s2 up a ramp inclined 5.0° above the horizontal. What are the magnitude of (a) the net force on the rider and (b) the force on the rider from the motorcycle?
asked on October 9, 2010 
math
my P.E. teacher asked the 100 seventh graders in my school if they could swim. Half of the boys and two thirds of the girls said yes. Seventeen boys said no. How many seventh graders know how to swim?
asked on October 7, 2009 
Math
. A school has conducted an exam for the 8th grade and published the results in the table. Find the measure of the central angle that would represent the percent of students who took German in the 8th grade.
asked on April 5, 2018 
Chemistry
The melting temperature of the fluorides of selected alkali metals and alkaline earths are listed below (see Table). If one considers the trend of the listed melting temperatures in terms of both the ionic character of the bonds and the ionic potentials of
asked on January 22, 2011 
gen 300
Identify a problem in your daytoday life you would like to solve (e.g., time management). Using the information from your Week Three readings as a guide, prepare a 700 to 1,050word paper in which you develop a research strategy to find a solution for
asked on August 24, 2009 
Algebra 2
M Varies jointly with A and T and inversley with H. Write and equation that represents the relationship.
asked on December 14, 2010 
psychology
Jeff says, "It seems like the more money people make, the more debt they assume," but a/an __________ study might make the case that a rise in income does not by itself cause an increase in debt. criterion validity case experimental correlational I chose
asked on October 30, 2010 
Science
In what group of the periodic table is the element with the following configuration [Ar] 4s2 3d10 4p3
asked on August 25, 2018 
math
Hello, i would like to know what is the complex conjugate of : (a*c*d)×( (e*d+i)/(1e*c*d^2) ) Thanks for your help.
asked on November 3, 2013 
programming
b. Write a wellcommented C++ program that reads data from the input file employee.txt. Each input line consists of last name, first name, base salary, total sales, and number of years of service. Store the output in the file employees_payCheck.txt. Format
asked on June 1, 2013 
math
express 84 minutes as a fraction of 4 hours
asked on July 8, 2016 
Math
Hello, I'd like to know how in developing, factoring or simplifying, we can move from: A + ( (1 / ( (1 / ICD) + IED) ) to: ACD *( (  ED + I ) / (1  ECD^2 ) ) ACDE are strictly positive real constants. I is an imaginary number.
asked on November 2, 2013 
psychology
One advantage of using tests in research, rather than laboratory observation, is the usefulness of: the presence of the researchers, which increases the reliability of the results. describing behavior, rather than explaining it. tests in clarifying the
asked on October 30, 2010 
math
If a mouse fell to the bottom of a 8 foot deep well and he climbed 3 feet every day but fell 2 feet every night how many days would it be before he got out of the well?
asked on October 24, 2018 
math
Hello, i would like to know what is the complex number of : (a*c*d)×(e*d+i)/(1e*c*d^2) ACDE are strictly positive real constants. I is an imaginary number. Thanks you a lot for you help.
asked on November 2, 2013 
psycholgy
Prepare a 1,050 to 1,400word paper in which you reflect on a challenging experience that you have encountered in either a professional or personal environment that involved significant “thinking through” or reasoning. Be sure to address the following
asked on August 8, 2009 
Stats
I there are 1000 numbers in a contest what is the probability you win if:  play 1 number for $1.00  play 2 numbers for $1.00  play 1 number for $2.00
asked on February 25, 2016 
psychology
To gain acceptance, a hypothesis must be: suggested by a credible authority. kept secret until the research is completed. imaginative and appealing. backed by empirical evidence
asked on October 30, 2010 
psychology
It is the proper role of a psychological research scientist to: question data. make safe predictions. keep research methods accessible only to those involved in the research. avoid making predictions.
asked on October 30, 2010 
fractions
I cannot figure out how to turn fraction into decimals.Sample 8 over 25.Also turning decimals into fractions 0.65
asked on August 26, 2008 
Science
A ball thrown vertically upward has a speed of 5.0 m/s at a height of 3.0m. The mass of the ball is 1.2 kg. Find its mechanical energy
asked on March 11, 2016 
Physics
What is the magnitude of the electric field 0.3 m from a 104 C point charge?
asked on November 29, 2012 
Physics
A 100 m long wire with a crosssectional area of 4 mm2 has a resistance of 6 ohms. What is the resistivity of the material of the wire in Ùm?
asked on November 29, 2012 
math
your class has 8 women and 19 men. write the number of women to men as a ratio and as a quoyient. whatpercent of the class are women? show your work.
asked on February 9, 2011 
social studies
To use dollarcost averaging, an investor must invest: in securities with high average yields. in dollars rather than currencies from outside the U.S. or Canada. a variable amount of money at regular intervals. the same amount of money in stocks regularly.
asked on October 28, 2010 
A level Mathematics
Show that the tangents to the curve X=ln((y^2)6y+11) ,at the points where X=ln6,meet at the point ((ln6)(4/3),3)
asked on September 5, 2009 
psychology
reflect on a challenging experience that you have encountered in either a professional or personal environment that involved significant “thinking through” or reasoning.
asked on August 8, 2009 
PHYSIC
A block displacement causs of a force in a horizontal surface is 13m and the work done by the force on the block .6 joules .
asked on August 20, 2016 
math
Hello, I'd like to know how in developing, factoring or simplifying, we can move from: goo.gl/zZdzSs ACDE are strictly positive real constants. I is an imaginary number.
asked on November 2, 2013 
math
Hello, I'd like to know how in developing, factoring or simplifying, we can move from: A + ( (1 / ( (1 / ICD) + IED) ) to: ACD *( (  ED + I ) / (1  ECD^2 ) ) ACDE are strictly positive real constants. I is an imaginary number. Thanks a lot for your help.
asked on November 2, 2013 
math
ratio of 8/9,quotient of 8/19,percent of 8/19.
asked on February 9, 2011 
Math
The rounded numbers all range from the hundred thousands to the millions. Which placevalue should be used as intervals for a scale for the graph?
asked on January 12, 2011 
algebraa
find the length of the third side of the triangle perimeter=12 3cm 4cm
asked on August 31, 2010 
maths
Show that the tangents to the curve X=ln((y^2)6y+11) ,at the points where X=ln6,meet at the point ((ln6)(4/3),3)
asked on September 5, 2009 
algebrra
perimeter: 56cm 7cm 24cm the lenght of the third side of the triangle is? idk
asked on August 31, 2010 
Algebra Math 116
How can you tell if a value is a solution to an inequality.
asked on August 20, 2009 
language
My school gives out these pop quizzes and this bonus quiz asks this question: what does polyvinylrododospagaspamomo mean? please help! sincerely, Karl
asked on February 24, 2009 
language
My school gives out these pop quizzes and this bonus quiz asks this question: what does polyvinylrododospagaspamomo mean? please help! sincerely, Karl
asked on February 24, 2009 
Algebra (logs)
Please help, I need help on these two problems. Solve the equation. log3(x − 16) = log3(9x) e^1 + ln(7) It appears on the homework that the ln(7) is written like this ^ln(7) but I am still stuck on it. Thanks!
asked on April 22, 2013 
algebraa
perimeter= 30 5cm 12cm the lenght of the third side of the triangle is?
asked on August 31, 2010

Math
Oh thank you so much, I was confused about the fees
posted on February 10, 2020 
Math
Is it 97
posted on February 10, 2020 
math
Thx
posted on March 21, 2019 
Science
If I look at the exact element it goes under group 5A. Then if I consider the valence electron it will be under group 3A. Im still confused.
posted on August 26, 2018 
college physics
An aluminum cup contains 225 g of water
posted on November 18, 2017 
Chemistry
1.44*10^66
posted on November 10, 2017 
chemistry
u suc at life
posted on June 11, 2017 
algebra 1
75
posted on August 25, 2016 
history
Actually the correct answers are D, B, A
posted on May 9, 2016 
history
I believe the correct answer is C.
posted on May 9, 2016 
history
8:D 9:A
posted on May 9, 2016 
try,check,and revise
I agree with Steve.
posted on April 12, 2016 
Math
Just do 5 divided by 8 and then do 24 divided by that outcome.
posted on April 12, 2016 
social studies { somebody please help me please
was the answer to number 3 D(santee cooper project)?
posted on April 12, 2016 
Social Studies
Sorry for the late response, but your answers are correct.
posted on April 12, 2016 
Stats
I thought I was looking for a %
posted on February 25, 2016 
chemistry
438mL
posted on October 15, 2015 
chemistry
Well, the pressure here is not constant, but the temperature is. Reversible implies that there are infinitesimal changes in certain parameters. For isothermal, reversible systems delta H=0 delta U=0 q=w and w=nRTln(Vf/Vi) You can find your Vf by using
posted on September 28, 2015 
Pyhsics
Coefficient of kinetic friction= tan0 Accelaration/gcos0
posted on February 17, 2015 
Pyhsics
0.176
posted on February 17, 2015 
At what temperature do hydrogen molecules have the
At what temperature do hydrogen molecules have the same rms speed as nitrogen molecules at 90 degrees Celsius?
posted on November 10, 2013 
math
Thanks a lot for your help . I'll visit it
posted on November 2, 2013 
Math
I made a picture. goo.gl/zZdzSs
posted on November 2, 2013 
chemistry
there should be an E(V) too. let suppose your E(V)=.128.. your calculation should somewhat look like this if I'm not wrong, Ecell=E^o cell  (RT/nF)lnQ .125=0(.0592/2)lnQ e^(.128/.0296)=[I]/.1M [I]=.001324 [Pb]= [I]x(1/2)=.000662 ksp=[Pb][I^2]=1.16E09
posted on October 25, 2013 
chemistry
If lithium is a BCC crystal. planar density is atoms per area the 001 plane look like this oo   oo the sides are equal to lattice constant a and the atoms in this area = 4(1/4) = 1
posted on April 26, 2013 
chemistry
Lithium is a BCC Crystal a = 3.5092 * 10^8 Planar Density (001) (top plane) = 1/a^2 = 8.12 * 10^14
posted on April 26, 2013 
EnglishLiterature
house
posted on July 10, 2012 
Math
okay thanks bobpursley
posted on January 12, 2011 
psychology
D!! Thank you
posted on October 30, 2010 
psychology
based on the websit you provided I will assume it is B.
posted on October 30, 2010 
psychology
Would it be D?
posted on October 30, 2010 
psychology
I chose D. Am I correct?
posted on October 30, 2010 
psychology
Please help!!
posted on October 30, 2010 
psychology
Im confused, please help!
posted on October 28, 2010 
social studies
I think its D, but not sure, please help!
posted on October 28, 2010 
physics
a)2.910 b)11.089
posted on October 25, 2010 
physics
hows that it doesnt work whats the full equation?
posted on October 9, 2010 
Chem
u need to get the M as M= 15*M(C) + 22 * M(H) + 2 * M(O) + 1 M(Cl) + 1 M(N) then u use the formula n=m/M and u replace youll have m= n*M
posted on October 9, 2010 
algebraa
thats what i gett
posted on August 31, 2010