Wednesday
August 20, 2014

Posts by Jack


Total # Posts: 1,300

physics
A 0.077-kg arrow is fired horizontally. The bowstring exerts an average force of 50 N on the arrow over a distance of 0.75 m. With what speed does the arrow leave the bow?
May 21, 2010

Chemistry
Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many joules is this? Are these steps right? 32.0g x 55*C = 1760 calories = 420.65 Joules
May 19, 2010

Chemistry
Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many joules is this?
May 19, 2010

Chemistry
Using calories, calculate how much heat 32.0g of water absorbs when it is heated from 25.0 degrees C to 80.0 degrees C. How many joules is this?
May 19, 2010

computers
Microsoft Excel (full name Microsoft Office Excel) is a spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X. It features calculation, graphing tools, pivot tables and a macro programming language called VBA (Visual Basic for ...
May 18, 2010

Chemistry
But that's just .100 over .100 for the base over acid isn't it? then it would just be 6.4 X 10-5 because the log of 1 is 0?
May 5, 2010

algebra
the sum of
May 3, 2010

Chemistry
Which of the following compounds will melt ice at the lowest temperature? Sucrose, sodium chloride, or magnesium chloride?
May 2, 2010

Chemistry
Answer the following question about copper (II) sulfate pentahydrate: a)how much water (in g) is there in 10.0 g of the compound listed above? b)If you needed 2.50g of CuSO4 for a reaction but only had CuSO4 * 5H2O available, how many g would you need to use to get the same ...
May 2, 2010

Chemistry
A)250 g of LiBr is dissolved in 200g of water 100 degrees C. The solution is then cooled to 20 degrees C. How much precipitate (if any) is formed? B) 42 g of KCl is dissolved in 100g of water at 50 degrees C. The solution is then cooled to 20 degrees C. How much precipitate (...
May 2, 2010

Global History
What were the differing politucal and economic systems between the US and Soviet Union that helped lead to the Cold War? I know that the political difference was that the US was democratic and the Soviet Union were communists. However, if the US economic system was ...
May 1, 2010

chemistry
What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O Are these the right steps? 1.40mol Na2SO4 / 1.75kg = .8m 3 * 1.86 degrees C * .8m = 4.46 degrees C 4.46 degrees C - 1.86 degrees C = 2.6 degrees C
April 29, 2010

Chemistry
Determine the freezing points of each 0.20m aqueous solution. a)K2SO4 b)CsNO3 c)Al(NO3)3
April 29, 2010

Chemistry
What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O b)0.060 mol MgSO4 in 100g H2O
April 29, 2010

math algebra with pizzazz
pg 142 What happened to the computer programer
April 28, 2010

Chemistry
How many grams of K2SO4 would you need to prepare 1500 g of 5.0% K2SO4 (m/m) solution?
April 26, 2010

Kindergarten Math
A counter is a small plastic circle about a half-inch in diamiter
April 19, 2010

grade 10 career studies
I have to hand in an assignment called WHO AM I? for my grade 10 career studies course, i just need to no what to hand in exactly
April 16, 2010

Osciallations
A harmonic oscillator has mass 0.530km and an ideal spring with force constant 146N/m . Find the period, frequency, and angular frequency.
April 15, 2010

Trig
oh it's tan(x/2) = a ........... use the fact that x = 2 . x/2
April 13, 2010

Trig
Given that tan(pi/2) = a. Express tan(x) and sin(x) in terms of a. Hint: Use the fact that x = 2.(pi/2)
April 13, 2010

Chemistry
Which of the following substances dissolve to a significant extent in water? Explain your answer in terms of polarity. a) CH4 b) KCL c)He d)MgSO4 e)sucrose f)NaHCO3
April 13, 2010

PRE CAL SEQUENCES
Given the following finite sum 1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+....+1/(n(n+1)) a) Find the first 5 partial sums b) Make a conjecture for a formula for the sum of the first n terms c) Use mathematical induction to prove your formula
April 12, 2010

Accounting
The cost principle requires that when assets are acquired, they be recorded at
April 12, 2010

Chemistry
The molecules water (H2O) and methane (CH4) have similar masses, but methane changes from a gas to liquid at -161 degrees C. Water becomes a gas at 100 degrees C. what could account for the difference?
April 11, 2010

math
4(9.75h-3)=150 39h-12=150 39h=162 h=162/ 39=4.15, which means they can Afford to rent for 4 hours. This is for part (A)
April 7, 2010

English
the answer is do it yourself and stop trying to get it without studying you lazy ass.
April 7, 2010

Social Studies
What happened to Andrew Jackson when he was eight years old?
April 6, 2010

Chemistry
In a reaction chamber, 3.0mol of aluminum is mixed with 5.3mol Cl2 and reacts. The reaction is described by the following balanced chemical equation. 2Al + 3Cl2 ==> 2AlCl3 a)Identify the limiting reagent for the reaction. b)Calculate the number of moles or products formed c...
April 5, 2010

Web application development JSP
I would suggest that you go to a programming forum and ask for assistance there. I'm sure you will have more luck. Considering most helpers here are not proficient in programming. Good Luck!
April 1, 2010

Physics
A particle is moving along the x-axis subject to the potential energy function U(x) = 1/ x + x2 + x – 1. Determine the x-component of the net force on the particle at the coordinate x = 3.57 m
March 31, 2010

chemistry
If 7.24 kJ of heat is applied to a 952 g block of metal, the temperature increases by 10.7 degrees Celsius. Calculate the specific heat capacity of the metal in J/g degrees Celsius.
March 29, 2010

Chemistry
Write the 12 mole ratios that can be derived from the equations for the combustion of isopropyl alcohol. 2 C3H7OH(l) + 9 O2(g) ==> 6 CO2(g) + 8 H2O (g)
March 22, 2010

Physics
img242.imageshack.us/img242/9452/words.jpg That should be the image.
March 21, 2010

Physics
Hi, I've been having issues with solving this problem. Could anyone help? Two blocks, of masses M = 2.0 kg and 2M are connected to a spring of spring constant k = 215 N/m that has one end fixed, as shown in the figure below. The horizontal surface and the pulley are ...
March 21, 2010

Chemistry
Is 2HCl soluble in water? Is BaSO4 soluble in water?
March 16, 2010

Chemistry
Identify the precipitate formed when solutions of these compounds are mixed. H2SO4 + BaCl2 ==> So when you do the double replacement reaction, would the products of this chemical equation be HCl + BaSO4? or H2Cl2 + BaSO4 ? (not balanced) also would both of the products be ...
March 16, 2010

Chemistry
How do you balance Al(OH)3 --> Al2O3 + H2O Why does the OH decompose into O3 and H2O??
March 15, 2010

Chemistry
Classify each reaction and balance the equations. Al(OH)3 ==> Al2O3 + H2O
March 15, 2010

Chemistry
Complete and balance this decomposition reaction HI ==> is this reaction HI ==> H + I ? or... HI ==> H2 + I2 ? why?
March 14, 2010

Chemistry
Complete and balance this equation for a combination reaction. Be + O2 ==> Would it be Be + O2 ==> BeO2 ? or... 2Be + O2 ==> 2BeO ? Why??
March 14, 2010

science
okay after the diver jumps foward from the diving board,the force of gravity will accelerate the diver PARALLEL to the direction of motion , is the uppercase true or false?
March 8, 2010

Physics
An electric field exerts a force of 3.00 E-4 N on a positive test charge of 7.20 E-4 C. The magnitude of the field at the location of the charge is?
March 7, 2010

Math
sweet, thanks for the help guys, gonna win now.
March 6, 2010

Chemistry
Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas. Is Al2(CO3)3 ==> Al2O3 + CO2 the right equation? If so, how do you balance this equation?
March 1, 2010

Chemistry
Balance the following equations. A) SO2 + O2 --> SO3 B)Fe2O3 + H2 --> Fe +H2O C)P + O2 -->P4O10 D)Al + N2 --> AlN
February 28, 2010

Chemistry
Write and balance equations for the following reactions. A)Iron metal and Chlorine gas react to form solid iron(III) chloride. B)Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas. C)Solid magnesium reacts with aqueous silver nitrate to ...
February 28, 2010

chemistry
Write Skeleton equations for these reactions. A) Heating Copper(II) sulfide in the Presence of diatomic oxygen produces pure copper and sulfur dioxide gas. B)When heated, baking soda (Sodium hydrogen carbonate) decomposes to form the products sodium carbonate, carbon dioxide, ...
February 28, 2010

bcc
if you put honey,water,dishwashing liquid and vegetable oil in a clear jar and then you add asmall of plastic cup, plastic fork, straw and a small piece of styrofoam cup.
February 26, 2010

bcc
how do you work equation dealing friction and newtons when pulling the distance of a block
February 26, 2010

Music
tell me about the rocks band
February 26, 2010

Chemistry
which has the highest lattice energy BaO or SrO
February 23, 2010

chemistry
Compound A contains 1.75g nitrogen and 3.99g oxygen. Compound B contains 19.6g nitrogen and 56.0g oxygen. Are compounds A and B the same? Explain.
February 21, 2010

chemistry
Find the molar mass of Chromium (III) Hydrogen Phosphate. Also, what is the chemical formula for this molecule?
February 21, 2010

chemistry
The mass of twenty-three dozen pencils is 1.496 kg. What is the mass of 1 pencil?
February 21, 2010

chemistry
How many neon atoms are there in five moles?
February 21, 2010

chemistry
How many carbon atoms are there in 150.0 g Glucose? (Glucose is C6H12O6, molar mass = 180.16 g/mol)
February 20, 2010

chemistry
Convert 12 fluid ounces liters. (1 fl. oz = 29.57 cm^3)
February 20, 2010

chemistry
Which of the following are empirical formulas? A) Ribose (C5H10O5) B) Ethyl Butyrate (C6H12O2) C) Chlorophyll (C55H72MgN4O5) D) DEET (C12H17ON) (numbers are subscripts)
February 17, 2010

ecology
examples of how humans have increased their food supply and what effects these methods have on the environment overall.
February 16, 2010

chemistry
How many grams of oxygen are there in 100.0 grams of water? What percentage of the mass of water is oxygen?
February 15, 2010

chemistry
Find the number of K atoms, C atoms, and O atoms in 95.5g of K2Cr2O7. (Potassium 2, Chromium 2, Oxygen 7).
February 15, 2010

English
they seem good to me
February 15, 2010

chemistry
consider the reaction in which 410 grams of Ca(NO3)2 react with just the right amount of lithium metal in a single replacement reaction. 1-how many grams of lithium are required? 2- how many grams of each product can be produced?
February 15, 2010

mathhhh
i have 78% in the course the exam is worth 30% and i got 65% what is my overall mark in the course
February 4, 2010

math
i have 78% in the course the exam is worth 30% and i got 65% what is my overall mark in the course
February 4, 2010

math
a trianglar course for a sailing race is marked off by buoys. The first lef is 250 meters longer than the second and the third leg is 100 meters shorter then the first. if the length of the course is 2500 meters, find the length of each length
February 4, 2010

math
the first side of a triangle is 8 meters longer than the second side. the third side is 3 times the second side. the perimeter is 128 meters. find the lengths of the three sides.
February 4, 2010

chemistry
The vapor pressure of dichloromethane, CH_2Cl_2, at 0 degrees celcius is 134 mmHg. The normal boiling point of dichloromethane is 40 degrees celcius. Calculate its molar heat of vaporization (in kJ/mol).
January 31, 2010

History
sue's answer doesnt help at all. thanks alot i failed
January 26, 2010

History
All of the following account for nativist sentiment against the New immigrants of the late 19th century EXCEPT that the immigrants a. practiced different religions b. had different languages and cultures c. were willing to work for lower wages than were native born workers d. ...
January 26, 2010

science
I added 40 mL of NaOH 1N to rise the pH of 10g teriphitalic acid from 5.3 to 6.3, so if I adde the same 40 mL of NaOH to 12g of the same acid what is the new pH will I have?
January 22, 2010

science
why does magnesium dissolve quicker in strong acid
January 17, 2010

Physics
Oop's, my bust. It's 60 Joules. I believe the 50m was thrown is a curve to throw me off, as as the '60J' = W. Otherwise it would have been say '60N over 50m = 3000J'. Thanks guys.
January 17, 2010

Physics
A car with a mass of 100 kg, with initial v = 1 m/s, has 60 Joules of energy added for 50 m. What is the final velocty? I'm using KE = 1/2 mv^2 to find initial KE. Then add 600 J to this for the final KE. Thus, W = KFf - KEi; KEf = W + KEi and KEf = 1/2mv^2 v^2 = (2(KEf))/m
January 17, 2010

9th grade
an egyptian form of writing
January 14, 2010

Math
How do you divide whole numbers?
January 13, 2010

Math
how do i compute a problem like 4/7 * 2/3 * 6
January 5, 2010

Algebra
15=2(9+4)+3
December 31, 2009

math
DQ sells 6 times as many orders of french fries as sonic everyday. If both sold 60 more orders DQ would only sell 3 times as many fries. How many do each sell before and after the incease?
December 23, 2009

Pre-Cal
Find the exact value of sec 60°tan135°-cot60°sin60°
December 23, 2009

math
The sweater shop projected income this year will be 69,000. That amount represents 40% of the shops annual sales. What is the shops projected sales
December 22, 2009

math
If I gross 2645.00 and taxed 31% how much do I bring home?
December 22, 2009

math
a wagon retails for 49.97 the store receives a built in 40% profit margin what is the cost
December 21, 2009

math
I can buy office supplies @ walmart with a 30/10 chain discount. If I paid $47.25 for adding machine. What was the regular price of my purchase? 30/10 chain discount means .70 x .90
December 21, 2009

math
I can buy office supplies @ walmart with a 30/10 chain discount. If I paid $47.25 for adding machine. What was the regular price of my purchase?
December 20, 2009

solve for unknown
thank you
December 19, 2009

solve for unknown
If jack does home improvment and price the material ,add 1 and 1/2 times that amount for labor and then quotes the job. If he gets the job for 17,000 how much is the material? and labor ?
December 19, 2009

math
wagons retail for $49.97. stores receive the wagons with a 40% profit margin. what is the cost?
December 18, 2009

French
What does conduissez mean in french?
December 11, 2009

math
Mr. Havel bought a car for $2400 and sold it for $2700. what was the percent of profit for Mr. Havel in selling the car?
December 2, 2009

health
for the health i get very good but my head alwas hrt so how do i do i don't know tell me why
December 2, 2009

physics
31^2+67^2=5186 sqrt(5186)=72.01388 ANSWER =72.01388
November 27, 2009

science
How does the portuguese man of war contribute to science?
November 23, 2009

religious education
please could someone help me answer this question - can science prove that God does exist? thankyou
November 20, 2009

Math
Thanks!
November 18, 2009

Math
I need help with an inverse function. If f(x)=3-x, I find the inverse function to be: x=3-y which is the same as y=3-x, same as the original. How can this be?
November 18, 2009

physics
A worker exerts a 140 N horizontal force on a 41 kg crate. The crate's acceleration across a level floor is 0.90 m/s2. Find the frictional force that the floor exerts on the crate.
November 18, 2009

physics
Suppose David Ortiz hits a home run which travels 361. feet (110. m). Assuming it left the bat at 50.°, how fast was it hit?
November 12, 2009

psychology
1)When conditioning takes place, behavior is associated with? a. ideas b. stimuli, consequences, or both c. events in the environment d. both b and c are answers. my first answer was b but this was wrong. Is the correct answer d? 2) In classical conditioning, the main ...
November 11, 2009

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