Saturday

February 28, 2015

February 28, 2015

Number of results: 306

**music yr 8- re- drwls**

thankyou drwls for your help on buddy holly
*September 22, 2008 by astra*

**math**

Posted by mota THE MASS OF THE SUN IS ABOUT 10^27 METRIC TONS , OR 10^30 KILOGRAMS . HOW MANY KILOGRAMS ARE IN ONE METRIC TON ? ----------------------- math - drwls 1000. ----------------------- explain please i want to understand this question :) this is my question i posted ...
*March 2, 2008 by mota*

**physics-bobpursley/drwls please check**

bobpursley/ drwls please help me with my post on Sunday, April 15 at 10:16pm and 10:19pm. Thanks!
*April 16, 2007 by Mary*

**physics: drwls**

drwls for the question below, the answer seems to be wrong: The four tires of an automobile are inflated to a gauge pressure of 1.8 multiplied by 105 Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight of the automobile. It asks for the ...
*July 22, 2008 by Elisa*

**math**

Posted by mota on Saturday, March 1, 2008 at 3:34am. THE MASS OF THE SUN IS ABOUT 10^27 METRIC TONS , OR 10^30 KILOGRAMS . HOW MANY KILOGRAMS ARE IN ONE METRIC TON ? ----------------------------- math - drwls 1000. ----------------------------- explain please i want to ...
*March 2, 2008 by mota*

**DRWLS,MATH,ALGEBRA**

Drawls, How did you get 2h. and then the 2a/h from.Can you help me understand it when you get a chance. Directions: Solve each literal equation for the indicated variable. A=1/2h(B+b) (For b) Area of a trapezoid For Further Reading math,algebra - drwls, Monday, December 18, ...
*December 18, 2006 by jasmine20*

**Physics check**

A speeder traveling at 41 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 3.3 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder? Im sorry I am new to physics this is my first year and...
*July 13, 2010 by Me*

**Physics**

Two 0.09g pith balls are suspended from the same point by threads 40cm long. (Pith is a light insulating material once used to make helmets worn in tropical climates.) When the balls are given equal charges, they come to rest 19 cm apart What is the magnitude of the charge on ...
*January 25, 2010 by Lanise*

**Algebra-please check**

Could someone please check my solution-Thank you-DRWLS helped me set it up and I solved it, I think From the top of a mountain 150 feet high, Jessie stands at the safety rail on the edge and looks below. The angle of elevation from his bike on the ground to Jessie is 38 ...
*January 7, 2011 by Joseph*

**physics**

thank you for your help drwls
*January 27, 2008 by Charles*

**Math**

I got it! Thank for your help, drwls.
*December 10, 2007 by Thanks, drwls*

**drwls**

Thank you very much.
*March 6, 2008 by Pam*

**physis**

to DRWLS thanks for the help DEEK./
*May 23, 2011 by DEEK*

**math. HOW DO I CONVERT A DECIMAL TO A FRACTION**

how do i convert a decimal to fraction in SIMPLEST FORM? a) -2.756 ?? Write out the 0.756 as 756/1000, then reduce it to lower terms if you can. Since both numerator and denominator are evenly divisible by 4, 756/1000 can be reduced to 189/250. The mixed number becomes -2 189/...
*February 25, 2007 by sarah*

**DRWLS**

THANKS WHAT IS WRONG WITH ESTAR IN NUMBER
*November 8, 2007 by sam*

**Physics**

In my last post, I'm confused how drwls got P2/P1 = 14.8
*January 8, 2009 by Phil*

**drwls **

thankyou for your help its helped me alot you are a star!
*October 6, 2009 by dominique*

**TO drwls**

I just wanted to say THANK YOU so much. You're a lifesaver!
*February 22, 2008 by Shirley*

**drwls**

Thank you for your help, & for the website, makes for some interesting reading.
*March 31, 2008 by TJ*

**To: Drwls**

can you please check my previous science post, thanks
*March 1, 2010 by Sara*

**algebra**

thanks drwls i have the correct answer thanks again :)
*May 6, 2010 by kiddo*

**physics**

thanks for the answer drwls. can you please explain to me, how it happened?
*December 4, 2011 by gem*

**drwls-year8 geography**

thanks for finding that link its helped me with my homework
*January 27, 2009 by AMIE*

**Physical Science**

Drwls, would please explain more? I'm not getting this. Thanks
*November 2, 2007 by Sarah*

**To: drwls**

Can you please have a moment to look at my other science post which you helped me on, thanks
*February 8, 2010 by Sara*

**math**

Thank u drwls n u obakeng now plz factorise this one. 25x^2-25xy+6y^2
*February 25, 2011 by Tshepiso mphehlo*

**For drwls**

I reposted again down below, if you wouldn't mind looking. Thanks, much appreciated :)
*June 28, 2008 by Casey*

**drwls + Ms Sue geog yr 8**

thanks so much to both of you for finding the websites they have helped alot.:)
*March 13, 2009 by misha*

**Physics**

Thanx DRWLS! Worked like a charm and I checked behind myself with the same formula!!!
*November 16, 2009 by Inascent*

**physics**

Good job "Drwls", your answer to my bowling ball question worked. Way to go!
*March 17, 2010 by norm*

**physics**

for some reason, choice 6 was incorrect when i tried it sorry to keep bothering you about it drwls
*February 20, 2010 by from previous question*

**ATTN: DRWLS RE: PHYSICS**

pete and john play a game of tug f war on a frictionless icy curface. pete weighs 539 N and john weights 392 N. during the course of the game, john accelerates toward pete at a rate of 3 m/s^2 a)what's the magnitude of the force that peter exerts on john? b)what's the ...
*January 23, 2010 by samir*

**math**

2Tons=____oz Try the method DrWLS or I showed you. Then repost if you don't understand but tell us what you are having trouble with.
*November 30, 2006 by brooke*

**Chemistry**

drwls, if you are there, I got an answer of 42.5 Kelvin, so then that means it is a negative number if converted to degrees Celsius? Question: The heat capacity of a bomb calorimeter is 87.5 kJ/K (this value is for the total heat capacity including that of the water jacket ...
*December 12, 2007 by Anne*

**drwls & Damon - maths**

hey guys, i follow you up to the point of intergrating the final line. How would I intergrate [x^-2.e^-x] dx thx
*December 29, 2007 by xX_Supaman_Xx*

**Physics- drwls please help**

A certain CD has a playing time of 80 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 x 10^2 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 x 10^2 rpm. Find the magnitude of the average angular acceleration of the...
*March 14, 2007 by Mary*

**One for drwls**

Thank you for answering my question. Can you steer me to making a quadratic from 1/4(x+3)^2-4 Then I can get the intercepts. Thanks Just multiply it out to put it in the standard form, ax^2 + b^2 + c (1/4)(x+3)^2-4 = (1/4)(x^2 + 6x + 9) -4 = (1/4)x^2 + (3/2)x - 7/4 You're a ...
*March 21, 2007 by charlie*

**Science**

Please drwls solve it for me two equal charges of magnitude 0.00000000032 is placed in an electric field. calculate the force of attraction between them
*November 5, 2012 by Drift*

**Maths**

Thanks for the help DRWLS. I tried to work is out and came up with this working out: A(4,-2) is parallel to 2x-3y=7 y = mx + c -3y = -2x + 7 y = 2/3x - 2 1/3 (y-y*) / (x-x*) = m (y+2) / (x-4) = 2/3 y+2 = 2/3(x-4) y+2 = 2/3x - 2 2/3 y = 2/3x-2 2/3 - 2 y = 2/3x-4 2/3
*March 15, 2008 by Mel*

**re-drwls-geography**

thanks for your help i would have labelled my question geology but it is for geography sorry
*February 8, 2011 by polly*

**math help**

did anybody answer my question drwls answered your geometry question.
*October 3, 2006 by jessica =]*

**DRWLS**

cAN YOU LOOK AT THE PREVIOUS POST. i am completely lost towards that equation...how do i even solve it because then i would have to cross multiply or cancel and that will give me zero.
*February 25, 2007 by jas20*

**physics**

A horizontal segment of pipe tapers from a cross sectional area of 50 cm2 to 0.5 cm2. The pressure at the larger end of the pipe is 1.26 105 Pa and the speed is 0.029 m/s. What is the pressure at the narrow end of the segment? Pa Please help! physics - drwls, Monday, April 9, ...
*April 10, 2012 by Malika*

**Physics**

A horizontal segment of pipe tapers from a cross sectional area of 50 cm2 to 0.5 cm2. The pressure at the larger end of the pipe is 1.26 105 Pa and the speed is 0.029 m/s. What is the pressure at the narrow end of the segment? Pa Please help! physics - drwls, Monday, April 9, ...
*April 10, 2012 by Malika*

**Physics**

A horizontal segment of pipe tapers from a cross sectional area of 50 cm2 to 0.5 cm2. The pressure at the larger end of the pipe is 1.26 105 Pa and the speed is 0.029 m/s. What is the pressure at the narrow end of the segment? Pa Please help! physics - drwls, Monday, April 9, ...
*April 10, 2012 by Malika*

**HEY DRWLS!! I have a question**

You're a genius, so can you please help me with my advanced algebra question. I posted it down below!! Thanks:) Miley
*January 29, 2008 by Miley*

**drwls history**

please could i say a huge thankyou you have helped me alot and i appreciate it thankyou again you are a star! :]
*October 17, 2010 by kellie*

**math**

3 3/4pt=____c show steps and work please Try the method DrWLS or I showed you FIRST. Repost if you still don't get it but tell us what you don't understand about the procedure.
*November 30, 2006 by brooke*

**Physical Science (repost for drwls)**

OK, I've been trying my best and for 3 I got B and for five I got B...? 4 still seems really tricky to me! -MC
*May 3, 2009 by mysterychicken*

**drwls, or other tutors**

does my last postage seem correct for the answers that i got. The one that doesn't have a reply. See previous reply to your post.
*March 1, 2007 by jas20*

**To drwls**

I posted some Physics questions yesterday, but no one got the chance to look at them, so can u please go to 2nd page and look through them.
*November 23, 2010 by Anabelle*

**drwls i replied!**

i replied and I answered below.
*November 7, 2006 by Francheska*

**for: drwls -Dr.Russ**

Is there a 'Dr.Russ' that can help with Organic Chem?
*March 12, 2008 by K*

**Physics to drwls question to answer given earlier**

A 0.700-kg ball is on the end of a rope that is 0.90 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What is the ...
*February 17, 2012 by Angelina*

**prealgerbra**

how do you solve 45 min/2 mi=?h/1 mi pre algerbra - drwls, Friday, January 6, 2012 at 11:44pm If you go 2 miles in 3/4 hour, you go 1 mile in 3/8 hour (or 22.5 minutes). how do we show are work then
*January 7, 2012 by steph*

**Thanks**

I would just like to sat thanks to drwls for helping me a bunch with the physics questions...AP physics is pretty hard..thanks again, whoever you are.. I am sure i will be back plenty of times!
*September 10, 2007 by Kristen*

**Physica**

If the length of a wire is doubled and its cross – section area decreased to half ,the resistivity of the wire becomes the same ( put true or false) pleas drwls
*July 16, 2012 by axxxxxxxx*

**Physica**

If the length of a wire is doubled and its cross – section area decreased to half ,the resistivity of the wire becomes the same ( put true or false) pleas drwls
*July 16, 2012 by lllllllll*

**Physics - drwls**

Posted by winterWX on Monday, March 19, 2007 at 11:51pm. A 2600 kg truck traveling north at 38 km/hr turns east and accelerates to 55 km/hr. What is the change in the truck's kinetic energy? What is the magnitude of the change in the linear momentum of the truck? What is the ...
*March 22, 2007 by winterWX*

**math**

Drwls - totally confused me on how this problem is done. Can someone else help to solve this problem? If two numbers are relatively prime, what is their LCM? Explain the reasoning and give 2 examples supporting the answer.
*March 26, 2011 by Brandon*

**drwls,math**

so you are saying that i should label p = 30 i = 0.0125/12 = 0.0010416666666666666666666666666667 n = 12(3) = 36 then plug it into what formula ? Problem: Stereo shack sells a stereo system for $600 down and monthly payments of $30 for the next 3 yrs. In the interest rate is 1...
*June 22, 2007 by student*

**math**

Whatwould be the answer 3+9+6+52x963+??? The answer depends upon where you put the parentheses. The order of operation makes a big differnece The answer depends upon where you put the parentheses. The order of operation makes a big differnece I agree with drwls...... But, ...
*February 23, 2007 by Crystal*

**physics**

i posted this question before however i did not understand drwls explanation. anybody else want to try ? Sam tosses a ball horizontally off a footbridge at 3.1 m/s. How much time passes after he releases it until its speed doubles?
*December 21, 2010 by tj*

**Physica**

Peace, and mercy and blessings of God Atqm thank you for helping me teach my children and success in physics at the Mah their college education and that the wrinkles in the balance Hassanatkm for all and especially Damo,Drwls, bobpursley.Elena
*July 17, 2012 by thank *

**Singapore Math**

Thanks "drwls" but do you know how to solve that problem using the bar model method? I know what the answer is. I just don't know how to draw it like you do in Singapore math. Thanks...
*December 12, 2012 by Ashli*

**One for Drwls (calc)**

Sorry, you're so quick, I took one of your answers for another question! Finally, Therefore, given my scenario, I could use the integral to calculate the area under the curve described by the derivative? Charlie.
*September 15, 2007 by charlie*

**physics **

DRWLS: PLEASE SEE ADDITIONAL INFO AT THE BOTTOM its the second part of the question that I don't understand: according the graph shown, the net force acting on an object varies wth the object's displacement. Calculate the work down by the force on the object at the various ...
*January 30, 2010 by Sarah N H*

**music-buddy holly**

i`m doing a school projrct about buddy holly ive looked in the site drwls suggested but i can`t find much info or many pictures . any ideas thanks
*September 22, 2008 by patrick*

**Physics**

A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 3.0 cm in bringing the block to a momentary...
*April 6, 2007 by Mary*

**Trigonometic**

Solving Trigonometic Equations solve for x : ( by radian) 1)cotx= 3 2)secx = 0.5 <<<and thanks >>> 1) Same as tan x = 1/3. Use a calculator. I get 0.321 radians 2) sec x = 0.5 is not possible. The absolute value of the secant must be one or more. << ...
*April 23, 2007 by abdo*

**For George**

At 11:37 and at 12:24 you posted the same question the earlier one was answered correctly by drwls by accepting your question the way you typed it. my solution is based on the assumption that your denominator was e^(t-7), an invalid assumption.
*September 11, 2008 by Reiny*

**geography**

i donot understand your answer drwls actually i feel difficulty in this project.please give me a hint how i prepare this and ialso feel difficulty in making pie chart
*January 9, 2012 by seibt*

**physics: BOB or DRWLS follow up question**

What average force is required to stop an 1100-kg car in 8.0 s if it is traveling at 95 km/h? i understand what you both did, but why can't you use the V = Vo + at equation and solve for acceleration there and use that in the EF = ma equation?
*November 21, 2007 by beckii*

**math**

6a^2+4a+5+3a^2+7a-2 That is the same thing as 9a^2+11a+3, but what is the question? You have just written an algebraic expression, not an equation to be solved. assuming you are required to factorise the equation and the expression give by drwls it factorises to (9a+3)(a+1) ...
*January 26, 2007 by chucke*

**Site not working correctly/Physics**

I posted a question a couple of days ago which was answered by DRWLS - thank you. Unfortunately I am unable to read the guidance provided as the typing is obscured by the adverts down the right hand side of the page. Look forward to replies. Thanks Mike
*December 7, 2011 by Mike*

**Math drwls please help**

Derive the basis functions Ni,3(u) and find the equation for the open quadratic B-spline curve defined by five control points p0, p1, p2, p3, and p4. I know the formula is P(u)= the sum of n,i=0(PiNi,k (u)) it's difficult to type the formula in this text box. I hope you can ...
*October 15, 2008 by Mary*

**drwls, math**

Did you mean the following for the problem: 10) perform the indicated operations 3 and 3/4 (divided by ) 1 and 3/8 . 3 3/4 - 1 3/8 . 15/4 (divided by ) 11/8= 30/11 =(after rounding it should be 2.73) thats how it suppost to be and look Yes, that is what I meant. You never said...
*November 26, 2006 by Jasmine20*

**physics**

When 1.60 multiplied by 105 J of heat enters a cherry pie initially at 20.0°C, its entropy increases by 470 J/K. What is its final temperature (C)? Drwls answered: delta S = entropy change = 1.6*10^5*[1/293 - 1/T2] = 470 Solve for T2 But after I checked the answer, it is not ...
*July 26, 2013 by Justin*

**material engineering**

Thank you so much drwls ... please, Do you mean is also possible to choose tin-coated steel for (Beverage cans)? Because it is required to choose more than one metal and compare them in terms of cost, attributes and manufacturing process, and then chose the most appropriate.
*March 7, 2011 by hym*

**algebra**

Can someone help me with this problem please? rationalize the denominator and simlify the answer: 5/2 + the square root of 3 Do you mean 5/(2 + sqrt 3) ? What you wrote could also be interpreted as 2.5 + sqrt 3. You need to be more careful to use parentheses when necessary to ...
*March 1, 2007 by Maria*

**Chemistry**

Mr.drwls help me to check if my answer is c0rrect,tnx anyways, what is the mass of calcium carbonate is required to react with sulfur dioxide produced by burning 1000 kgs of coal that contain 5% sulfur by mass? (0.781 kmole)(100kg/mole)=78.1 kg
*April 28, 2011 by joy*

**drwls please check**

Can you please check my physics posts. Thanks!
*November 6, 2007 by Mary*

**physics--drwls**

A record of travel along a straight path is as follows: 1. Start from rest with constant acceleration of 2.77 m/s^2 for 15 s 2. Constant velocity for the next 2.05 min 3. Constant negative acceleration -9.47 m/s^2 for 4.39 s. (a) What was the total displacement for complete ...
*September 7, 2007 by Star*

**Math**

What is the value of y if x = -3? y = 1 = 2(x-5) Plug in -3 for x, in the equation for y, and see what you get. I think you copied the problem wrong. Is the first = sign supposed to be a + or - sign? If not, you have already stated that y = 1. That cannot be true when x = -3. ...
*June 29, 2007 by Ruby*

**MATH**

Thanks for the answers but I must show the work for each problem. Can someone please help now that I finally submitted the square root correctly,thanks to drwls, and Ms. Sue. Thank you The slash (/) line represents that the number is a fraction. divide: sqrt45 / sqrt81 = ...
*October 29, 2011 by PLEASE HELP*

**physics**

anyone who knows the answer to this question please show your work. drwls i know i posted this queestion before but you didnt reply to my comment. Your friend has climbed a tree to a height of 6.00 m. You throw a ball vertically up to her and it is traveling at 5.00 m/s when ...
*December 21, 2010 by sabeen*

**physics - another question**

Sam is sitting in her fishing boat watching a trout swim below the surface. She guesses the apparent depth of the trout at 2.0m. She estimates that her eyes are about 1.0 m above the water's surface, and that the angle at which she's observing the trout is 45 degrees. b) ...
*January 16, 2010 by Sarah N H*

**Chem - DrBob222 & drwls**

Just want to say thanks to you guys for the help you gave me during the last couple of months. It was all in preparation for the National Chemistry Test and I just received word I have been selected to be in the running for the National Chem Team. Thanks again.
*October 8, 2007 by Vic*

**Physics - urgent**

I already asked this and was given an answer, but I don't fully understand it and so would like a further explanation. What I asked was... An electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to ...
*April 21, 2009 by Linn*

**Algebra-drwls please check!**

Posted by Megan on Tuesday, October 12, 2010 at 3:44pm. I have a question if someone could help, please explain it. Given b = -1 and h = -1, what is the equation of the graph if the parent function is y = sqrt (x) Answers: a.y = sqrt(x-1) b.y = sqrt (-x+1) c.y = - sqrt (-x-1) ...
*October 12, 2010 by Megan*

**Spanish**

If I wanted to say "My brother was born", could I write "Mi hermano fue nacido"? Yes, but "mi hermano nacio'" is more frequently used Thank you for using the Jiskha Homework Help Forum. Trust drwls. The correct way is to say "mi hermano nació" and be sure there is an ...
*December 18, 2006 by Alexandra*

**english**

If a person's name ends with "the third," do you capitalize "third?" Yes, but it would be preferable to use the Roman numerals (III in this case) after the name. DrWLS is right. Here's an example: Richard III John Edward Jones III See?
*July 28, 2007 by christina*

**Algebra**

Thank you drwls. I was not reading my own question clearly. I am trying to make the equation true for an object that is 100 pounds at sea level. Find the vlaue of C that makes the equation true. wouldn't C, being the contant, be where I put my 100 pounds?
*February 1, 2008 by Marysvoice*

**Maths**

What are bearings? Bearings are things that surround rotating shafts to reduce friction and wear. The word "bearing", as in compass bearing, can also refer to the direction that something is moving (such as 10 degrees east of north). I have heard of no meanings of the word ...
*July 1, 2007 by Fred*

**Physics**

True/False 1)Specular reflection obeys the laws of reflection while diffuse reflection does not. False. drwls said its true but I disagree can you please explain. 2)A convex lens is used to obtain an enlarged virtual image. True.
*April 8, 2008 by Jon*

**Algebra**

(sqrt3+5 sqrt6)(sqrt3-5 sqrt6) DRWLS-Just take the difference of the squares of the two terms, sqrt 3 and 5 sqrt6. Then you will have the answer. It will be a negative integer. 3sqrt is 9 6sq rt is 36 I add 5 to one and subtract 5 from the other? 50 and 55, then I am supposed ...
*February 3, 2008 by Micah*

**Chem**

I have a problem in which I'm solving for -w. My equation is this: -w= nRT ln V2/V1 However, I don't know the value of n, but I do know the values of P, V, and T. If I fill in (PV/RT) for n in the above equation, would I be using the energy R or the gas R? The R you use is the...
*March 6, 2007 by Alyssa*

**Inverse of log function**

Find the inverse of f(x) = log(2+x) - 4 the base is "a" Call f(x) y y = loga(2+x) -4 y+4 = loga(2+x) a^(y+4) = 2 + x x = a^(y+4) - 2 drwls, you have merely solved the equation for x. The question was to find the "inverse", so the actual answer should be y = a^(x+4) - 2
*March 1, 2007 by Jen*

**Algebra- is my answer right**

The function g is defined by g(x)=3x^2+6. Find g(5y) Algebra - drwls, Friday, February 4, 2011 at 11:07am 3*(5y)^2 + 6 = __? Algebra - Janet, Friday, February 4, 2011 at 3:56pm I get 75y+6
*February 4, 2011 by Janet*

**trigonometry**

Find the distance using the appropriate arch length. A television tower 520m high subtends an angle of 2deg30'. How far away is the tower? some people that helped me alot were Reiny, Damon, bobpursley, and drwls..so i just wanna say thnks to you guys...are u guys math expersts...
*January 16, 2009 by y912f*