Thursday

July 30, 2015

July 30, 2015

Total # Posts: 171

**chemistry**

Calculate the pH during the titration of 20.00 mL of 0.1000 M CH3CH2CH2COOH with 0.1000 M NaOH after 26.5 mL of the base have been added. Ka of butanoic acid = 1.54 x 10-5.
*October 31, 2010*

**English**

Upon the death of Spitz in The Call of the Wild, Francois and Perrault decide that the new sled-team leader should be A. Dave. B. Sol-leks. C. Billee. D. Buck.
*October 3, 2010*

**physics**

Standing on top of the science building, which is 48 m high, a group of students use a slingshot to shoot a steel ball bearing straight up into the air. The ball bearing passes the students on its way down to the ground 3.2 sec after it was shot. (once the ball bearing leaves ...
*September 27, 2010*

**Physics**

i still don't understand parts b and c.
*September 23, 2010*

**Physics**

A stone is dropped off the science building and accelerates, from rest, toward the ground at 9.8 m/s/s. A curious physics student looks out the third floor window as the stone falls past. She happens to have a stopwatch and she finds that it takes 0.30 sec for the stone to ...
*September 23, 2010*

**physics**

i still don't understand how to do parts b and c.
*September 23, 2010*

**physics**

the mean radius of the earth is 6,000,000 meters. Express this value in kilometers
*September 18, 2010*

**biology**

how does a hypothesis help scientists understand the natural world?
*September 14, 2010*

**7th grade**

i have homework and it saids order 3 2 1 5,3, and 2. the LCM of 5,3, and 2 is _____.so_____ is the lcd. i dont understand the teacher did not explainn good the work book is called all-in-one student work book version A prentice hall mathematics course 2 please help mhe i need ...
*September 13, 2010*

**math**

From a point on a straight road, two cars are driven in opposite directions, one at 44 miles per hour and the other at 35 miles per hour. In how many hours will they be 237 miles apart?
*September 13, 2010*

**English**

Is it modifying a noun(adjective) or a verb(adverb)?
*September 1, 2010*

**Writing**

You need a topic sentence, which tells the main idea of the paragraph (usually first, but doesn't have to be), then at least two sentences giving additional information or supporting your idea. You can have as many supporting sentences as you need, but make sure they all ...
*September 1, 2010*

**Math**

Write down eight blanks in a row, and label them, from right to left (weird, I know): ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions. The digit in the thousands place is 5. Write it in that blank. Think what odd number is greater than 7 but less ...
*September 1, 2010*

**Biology **

Think of what stimuli are - external factors that have an effect on the body. The receptors 'feel' the stimuli. Read A again - what are chemicals, light, and pressure? Can they convert stimuli? Read B again - can receptors become aware of stimuli?
*August 31, 2010*

**science**

think about how much air is surrounding each object pushing on it (exerting pressure). Does it matter what the object is? Air pressure is basically the weight of the air above the object.
*August 31, 2010*

**Biology**

There are four choices here. Three of them have to do with emotions and synthesis (creating things or ideas). One deals with sequence and analysis (in this case, language). You can only choose one....
*August 31, 2010*

**Biology **

I don't know this one, but you could just look up each of the options in wikipedia, or google each option with the phrase "in adolescence" included in your search.
*August 31, 2010*

**physics**

She is travelling the same distance at each speed, so it doesn't matter what that distance is. You simply find the average of the two speeds.
*August 31, 2010*

**science**

To get you started: It looks like you want the equation for potassium and sulfur reacting to form potassium sulfide, that is potassium + sulfur ---> potassium sulfide Write this down using the chemical symbols for each. You will need to find the number of valence electrons ...
*August 31, 2010*

**Chemistry**

How would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?
*June 8, 2010*

**Chemistry**

How would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?
*June 8, 2010*

**Chemistry**

How would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?
*June 8, 2010*

**algebra**

together, jareds age and his daughters age total 100. but jareds grandfather is 70 years older than him. how old is jareds grandfather?
*May 13, 2010*

**math**

how long do guys take answer questions
*May 11, 2010*

**math **

i need help with my homework
*May 11, 2010*

**2nd grade**

how i can read
*April 27, 2010*

**Math**

That doesn't match the answer in the back of the book and I would like to know how to do the problem thank you
*April 12, 2010*

**Math**

Use the perfect square trinomial to factor each expression: 4x^2+20x+25
*April 12, 2010*

**Math**

Use common factoring and the difference of two squares to factor each expression... 5x^2-125
*April 12, 2010*

**Accounting**

to find noncontrolling?? you add the common stock and retained earning and then minus the investment? is this correct
*March 28, 2010*

**accounting**

How is the receipt of a dividend recorded under the equity method?
*March 28, 2010*

**algebra**

x2+12x+20=0
*March 24, 2010*

**9th grade**

whats the answer for xsquare+12x+20=0
*March 24, 2010*

**Chemistry-Titration**

Acid (Unknown) Solution: HCL Molar Ratio: 1:1 Volume:20 ml Concentration:? Base(Known) Solution: NaOH Molar Ratio 1:1 Volume 26 ml Concentration:0.1
*March 8, 2010*

**MATH**

13. A tree casts a shadow of 17 ft. The angle of elevation from the tip of the shadow to the top of the tree is 68°. To the nearest foot, what is the height of the tree? 14. The angle of depression of a diver from the boat is 34°, and the diver is 367 ft deep. To the ...
*March 8, 2010*

**Math**

Two cars start from the same place and travel in the same direction. If one car travels at 60 miles per hour and the other travels at 45 miles per hour, in how many hours will they be 60 miles apart?
*February 10, 2010*

**Economics**

4.20 Diamonds clearly satisfy less important needs than water, which is essential to life. Yet according to market prices, the essential commodity, water, is worth less than the less essential commodity, diamonds. Why would a vital com-modity such as water sell for so much ...
*January 26, 2010*

**us.history**

Why should Americans in the 1920s have shown greater concern for their future? then it tells me to note three things that were,or might have been,seen as "clouds in the blue skies of prosperity" i noticed someone has the answer but mines is very differently mine is a...
*January 19, 2010*

**Physics**

3.24E5
*January 17, 2010*

**science**

All are correct
*November 22, 2009*

**Math**

Molly’s age is twice Anita’s. If the sum of the squares of their ages is 80, then Translate these words into an algebraic equation to determine their ages?
*November 21, 2009*

**INFECTION CONTACT LENSES**

I NEED INFORMARTION FOR THE INFECTION WHEN USE CONTACT LENSES
*November 14, 2009*

**7th grade**

I HAVE A HOMEWORK INFORMATION OF CONTACT LENSES PROBLEMS OR INFECTIONS
*November 14, 2009*

**math**

the base of a rectangle is twice the length of the heigth .If the heigth of the ractangle is h inches, what is the length of the base
*November 11, 2009*

**List of Transition words**

Equally important furthermore along with additionally moreover likewise
*May 24, 2009*

**english literature**

What is the best way to structure and answer an essay with a question that has more than one question in a question
*March 15, 2009*

**Science**

How can you divide a mixture of iron and iron sulphide, without using a magnot?
*February 12, 2009*

**history**

the production of_________ was one of the first industries to be affected by the industrial revolution.
*January 6, 2009*

**CIVICS**

i DONT UNSERSTAND THiS CAN S0M30N3 3XPLAiN TO ME WHAT ITS SAYING.. Obama mocks McCain's promise to bring change By TERENCE HUNT – 1 hour ago GRAND JUNCTION, Colo. (AP) — Barack Obama on Monday mocked John McCain's promise to bring change to Washington, saying...
*September 15, 2008*

**Law and Ethics**

The problem I am having is that the instructions say to use the AMA website for your research and to find ethical opinions. The hint say: ethical opinions begin with "e". I am not able to find those using their search bar. Any suggestions? I am afraid if I don't ...
*July 20, 2008*

**physics**

By "see" I meant that I had checked my answer on the internet to see if I was correct in thinking that multipying the charge of an electron, charge of a proton, and k would yield the electrical force between an electron and proton. My answer was 23.10 x 10^-9 which ...
*March 29, 2008*

**physics**

I keep seeing 7.620497955 as the electrical force between a proton and electron but when I multiply (8.99 x 10^9)(1.602 x 10^-19)-(1.602 x 10^-19)/(10^-10)2 I get a diffrent answer. Am I multiplying the wrong numbers?
*March 29, 2008*

**Calclulus - L'Hopital's Rule**

lim csc x/1+cot x x=3.14
*March 16, 2008*

**ART!!!!!!!!!!**

WHAT ASPECT OF PHOTOGRAPHY CAN BE MANIPULATED TO CREATE FINE ART RATHER THAN SIMPLE PHOTOGRAPHS?
*October 6, 2007*

**HELP ART!!!!!!**

WHAT DOES IT MEAN IF A PRINT HAS 10/20 IN THE BOTTOM MARGIN?
*October 6, 2007*

**Physics**

A hot-air balloonist, rising vertically with a constant velocity of magnitude v = 5.00 m/s, releases a sandbag at an instant when the balloon is a height h = 40.0 m above the ground. After it is released, the sandbag is in free fall. For the questions that follow, take the ...
*September 13, 2007*

**Math**

Descibe how to use a Ten- Thousand square to round number to the nearest 1,000.
*September 11, 2007*

**Math**

2x(5*2-3) > x(3-5)-2(x-1) the answer I have got is x > 2/18. Can someone please tell me if this is the correct answer? 2x(10-3) > -2x - 2x + 2 20x - 6x > -4x + 2 18x > 2 x > 2/18 correct! sorry! simplify x > 1/9 Thanks i thought it was right b/c i tried to...
*August 6, 2007*

**algebra**

The sqrt of 12x^4 sqrt12= sqrt(4*3)= sqrt4 * sqrt3 what is the sqrt4, and what is the sqrt x4 ? sqrt12= sqrt(4*3)= sqrt4 * sqrt3 what is the sqrt4, and what is the sqrt x4 ?
*July 8, 2007*

**math**

solve for linear equation 2x + 3y = 6 (for x) i figured out the answer. thanks for your time though : ) x = (6-3y) ________ 2
*July 7, 2007*

**Geography**

What kinds of problems might exist in the Western Cordillera region for farming and transportation? Please help. thanks. Thank you for using the Jiskha Homework Help Forum. Each time you post try to give the complete frame of reference. When you just say "Western ...
*April 12, 2007*

**Physics**

One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what is the maximum value...
*April 3, 2007*

**Chemistry**

Find the pH during the titration of 20.00 mL of 0.2380 M butanoic acid, CH3CH2CH2COOH (Ka = 1.54 10-5), with 0.2380 M NaOH solution after the following additions of titrant. (a) 0 mL Ive got the answer of 2.72 (b) 10.00 mL Ive got the answer of 4.81 I'm lost from here......
*April 2, 2007*

**Physics**

The Spinning Figure Skater. The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center . When his hands and arms are brought in and wrapped around his body to execute the spin, the hands and...
*March 27, 2007*

**Physics**

A woman with a mass of 50kg is standing on the rim of a large disk that is rotating at an angular velocity of .50 rev/s about an axis through its center. The disk has a mass of 110kg and a radius of 4.0m. Calculate the magnitude of the total angular momentum of the woman-plus-...
*March 27, 2007*

**Physics**

Forces F1=7.50N and F2=5.30N are applied tangentially to a wheel with radius 0.330 m. What is the net torque on the wheel due to these two forces for an axis perpendicular to the wheel and passing through its center? It depends upon whether or not the forces F1 and F2 are both...
*March 27, 2007*

**Physics**

A hollow, spherical shell with mass 2.00 kg rolls without slipping down a slope angled at 38.0 degrees. (a) Find the acceleration, the friction force, and the minimum coefficient of fricition needed to prevent slipping. You will find the moment of inertia (I) of a hollow ...
*March 27, 2007*

**Physics**

A cord is wrapped around the rim of a wheel .250 m in radius, and a steady pull of 40.0 N is exerted on the cord. The wheel is mounted on frictionless bearings on a horizontal shaft through its center. The moment of inertia of the wheel about this shaft is 5.00kg*m^2. Compute ...
*March 27, 2007*

**chemistry**

what is the molecular geometry and bond angles of CF2Cl2? Is there any reason to suspect this won't be tetrahedral with bond angles of 109.5? The difference in electronegativity between F and Cl would be expected to alter the angles somewhat.
*February 26, 2007*

**Science help plz**

1. In an experiment, you remove the nucleus from an amoeba. Predict what will happen to the amoeba and explain why. plz help What does the nucleus do? Those functions would be absent. Since this is not my area of expertise, I searched Google under the key words "amoeba ...
*October 16, 2006*

**Math help plz ASAP.**

Rationalize each denominator. 6 + square root of 2 ____________________________ square root of 3 PLZ HELP..dont kno how to do this question.plz explain..thanks You have (6 + sqrt(2))/sqrt(3) multiply that by sqrt(3)/sqrt(3) to get [(6 + sqrt(2))*sqrt(3)]/3 and simplify To ...
*October 15, 2006*