Thursday

April 24, 2014

April 24, 2014

Number of results: 65,103

**physics-bobpursley/drwls please check**

bobpursley/ drwls please help me with my post on Sunday, April 15 at 10:16pm and 10:19pm. Thanks!
*Monday, April 16, 2007 at 7:24am by Mary*

**Physics-bobpursley please check**

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate ...
*Thursday, November 4, 2010 at 9:18pm by Joey*

**Science-bobpursley**

Thanks for helping me with al those parts bobpursley. If you have time, can you also check my questions please. Thank you very, very much in return. My post is on the second page.
*Tuesday, April 6, 2010 at 9:49pm by Sara*

**Physics-bobpursleyplease check**

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate ...
*Thursday, November 4, 2010 at 7:36pm by Joey*

**physics Again**

bobpursley can you please check my reply to your post about my question? I am not sure if I did my equation correctly. Thanks
*Wednesday, September 12, 2007 at 6:55pm by Haley*

**Physics, still don't get it!**

I'm sorry bobpursley I don't understand your response, please clarify. When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, its frequency is 12 Hz. When another object of mass m2 is hung on the spring along with m1, the frequency...
*Friday, April 6, 2007 at 2:56pm by Mary*

**Physics (CHECK)**

One student is pushing on a chair with a force of 260.6 N directed at an angle of 30 degrees above horizontal while a second student pushes on the same side of the chair with a force of 21.0 N at an angle of 15 degrees below horizontal. What is the magnitude, in N, of the sum ...
*Thursday, October 1, 2009 at 6:05pm by tracy*

**Physics- drwls please check**

Good morning. This is a repost. The system is telling me my calculations is incorrect. I thought a fresh pair of eyes would help. Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a ...
*Thursday, April 19, 2007 at 9:06am by Mary*

**Physics repost please check**

Good morning. This is a repost. The system is telling me my calculations is incorrect. I thought a fresh pair of eyes would help. Please tell me what I am doing wrong. Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. ...
*Friday, April 20, 2007 at 2:48am by Mary*

**drwl / bobpursley please check**

I had posted three questions at 1:48pm, 2:40pm and 2:41pm and I am having problems with them. Can you please check them for me. Thanks! Repost if you are not satisified with the responses.
*Tuesday, March 13, 2007 at 8:50pm by Mary*

**Physics-Please check calculations**

I posted this earler and you gave me help, could you please check what I did? Thank you If a car drives off a 40 m high cliff with a horizontal velocity of 15 m/s, how far from the base of the cliff will the car strike the ground? Could someone help with the equation, please ...
*Sunday, January 2, 2011 at 5:34pm by JessieLynne*

**bobpursley**

ok and for this other question could you check my work please! h t t p : / /i 3 4 . t i n y p i c . c o m / s 2 z h m v . j p g
*Wednesday, October 15, 2008 at 9:55pm by Claudia*

**Bobpursley plz help**

Can you please check my answers 3. Tx=2x+1,XW=x+7;TW Tx+XW=TW 2x+1+x+7+TW 3x+1+7=TW Answer: 3x+8+TW 4. WX=X+5,TW=4x+5;TX WX+TW=TX x+5+4x+5=TX 5x+5+5=TX 5x+10=TX
*Monday, August 24, 2009 at 8:27pm by Chrissy*

**for bobpursley please check**

ok So The American Association of Labor legislation did what then n
*Sunday, January 20, 2008 at 8:35am by Michalea*

**Geometric Series (bobpursley)**

Could you please check my same post again, I had another question.
*Monday, September 19, 2011 at 8:53pm by Anonymous*

**physics repost bobpursley**

The energy given off by 300 grams of an alloy as it cools through 50°C raises the temperature of 300 grams of water from 30°C to 40°C. The specific heat of the alloy (in cal/g C ) is: i know Q=CpM(delta T) but what is what? Responses * physics - bobpursley, Monday, June 22, ...
*Monday, June 22, 2009 at 10:48pm by jane*

**To: bobpursley**

Can you please check my other science posts as well. They are still on the 1st page, thank you very much:-)
*Thursday, April 8, 2010 at 8:41pm by Sara*

**physic please check answers test tommoro**

bobpursley did i do the math problem right if not could u do it for me .thanke
*Monday, June 4, 2012 at 4:52pm by lisa*

**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...
*Friday, April 6, 2007 at 8:42pm by Mary*

**Physics**

1)The velocity of sound in air is 332 m/s. If the unit of length is km and the unit of time is hour, what is the value of velocity? m/s bobpursley said he would be happy to check my work but I don't know what theyre looking for I thought they are looking for the unit which is ...
*Tuesday, April 15, 2008 at 12:17pm by Jon*

**Physics - urgent, please help!**

10pm. I asked "Show mathematically that to produce an image that is the same size as the object in a concave mirror, the object needs to be at twice the focal length from the mirror." and bobpursley answered: "1/o + 1/o=1/f 1/2f + 1/i=1/f 1/i=1/2f i=2f M=di/do= 2f/2f= 1 check ...
*Monday, November 17, 2008 at 11:06pm by Juniper*

**Physics Help me Someone plz**

If a galaxy is traveling away from us at 2.0% of the speed of light, roughly how far away is it? t= light years I got 2.4x10^8 light years but its wrong please help me out...thank you Physics Plz help me - Anon, Monday, May 6, 2013 at 9:17pm 5.98x10^6 Thatz still wrong Physics...
*Tuesday, May 7, 2013 at 6:50pm by Leila*

**BOBPURSLEY PLEASE CHECK BELOW!**

please check below! patience.
*Saturday, December 9, 2006 at 8:20pm by Margie...*

**physics**

thank you bobpursley
*Tuesday, September 21, 2010 at 5:14pm by john*

**PHYSICS, still cant get it**

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to the flatcar. What is ...
*Tuesday, February 27, 2007 at 9:59pm by COFFEE*

**Math CONTINUATION OF QUESTION FROM bobpursley**

Thank you for answering the question before bobpursley, I understand how you did the deriv of inside, outside, but how do I now do the second derivative since you have the extra -18x^2 in the numerator?? Thank you very much! (I suppose I have to brush up on my derivatives) ...
*Thursday, March 10, 2011 at 9:05pm by KIKSY*

**Physics**

bobpursley can you show the equasions you are using
*Sunday, January 8, 2012 at 5:44pm by Rick*

**physics**

A 34 g glass thermometer reads 21.6°C before it is placed in 135 mL of water. When the water and thermometer come to equilibrium, the thermometer reads 38.7°C. What was the original temperature of the water? I need help on this please could someone please help out.Thank you! ...
*Thursday, April 26, 2012 at 4:41pm by Akbar*

**Physics-Someone please recheck **

Bob Pursley rechecked my question and it was correct if you scan down but he didn't direct me where to find direction of magnetic force on plane and do the pilots have to make corrections to make up for the difference? I'd appreciate any help with that, if possible Thank you ...
*Saturday, April 23, 2011 at 8:25pm by Russ*

**physics**

Posted by michelle quendarsv on Saturday, November 20, 2010 at 5:26pm. Posted by michelle quendarsv on Saturday, November 20, 2010 at 3:55pm. if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please...
*Saturday, November 20, 2010 at 6:50pm by michelle quendarsv*

**physics- response to bobpursley**

which is false? Consider the following processes: I. Energy flows as heat from a hot object to a colder object II. Work is done on a system and an equivalent amount of energy is rejected as heat by the system III. Energy is absorbed as heat by a system and an equivalent amount...
*Wednesday, June 24, 2009 at 8:48pm by matt*

**math check question**

Subtract and Simplify: 4a^2/(a-b)-(4b^2-8ab)/(b-a) I have the answer as 4(a+b)^2/(a-b) or should it be 4(a-b)^2/(a-b) Responses Math problem check - bobpursley, Sunday, October 12, 2008 at 4:23pm just the numerator.. 4a^2-8ab + 4b^2, right? 4(a-b)^2 Now does that reduce with ...
*Sunday, October 12, 2008 at 4:40pm by Shawn*

**algebra 2**

How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and compute f(-2) algebra 2 - hellogoodbie, Saturday, January 16, 2010 at 1:47pm so is the answer f=21/2? if that is right, thank you ...
*Saturday, January 16, 2010 at 2:04pm by hellogoodbie*

**algebra 2**

How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and compute f(-2) algebra 2 - hellogoodbie, Saturday, January 16, 2010 at 1:47pm so is the answer f=21/2? if that is right, thank you ...
*Saturday, January 16, 2010 at 2:59pm by hellogoodbie*

**Accounting**

A check returned by a bank because the issuer's cash account balance could not cover the check is called a(n): a. Cancelled check b. Certified check c. Outstanding check d. NSF check
*Thursday, October 18, 2012 at 7:14pm by Anton*

**Physics-bobpursley or drwls please check if possib**

If I had the old-fashion camera that had a focal length of 35mm(0.035m) and I take a picture of a person 6 m away, how far does the film need to be from the lens to record a clear image? I know that the equation is 1/f = 1/d(object) + 1/d(image) so would I do the following: 1/...
*Sunday, February 13, 2011 at 2:47pm by Robert O.*

**chem -repost for bobpursley**

i don't know how to solve this. looked through all my notes but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand the theory behind this: "calculate the work need to make room for the products in the combustion of S8(s) to SO2(g...
*Sunday, April 17, 2011 at 8:53pm by please, help me *

**physics**

Bobpursley; you helped me with my question and I am a little stuck how would I find distance if I dont know time and vice versa?
*Thursday, October 6, 2011 at 12:01pm by Anonymous*

**bobpursley, please help me understand**

I asked "Show mathematically that to produce an image that is the same size as the object in a concave mirror, the object needs to be at twice the focal length from the mirror." and you answered: "1/o + 1/o=1/f 1/2f + 1/i=1/f 1/i=1/2f i=2f M=di/do= 2f/2f= 1 check my thinking...
*Monday, November 17, 2008 at 10:10pm by Juniper*

**Physics**

Please help me with the following problem: Joe is on a cross-country trip from New York to Los Angeles. He drives for 45.0 min at 70.0 km/h, 10.0 min at 95 km/h, and 30.0 min at 55.0 km/h, and he spends 20.0 min eating lunch and buying gas. What is the average speed for this ...
*Wednesday, March 5, 2014 at 5:26pm by Brady*

**Reiny or Damon or Bobpursley **

Express the series 11 + 18 + 27 +...+ 171 using sigma notation. Usually you would take 27-18 and thats the step between numbers, right? (I think its the k-value?) But 27-18=9 and 18-11=7. Are we stepping by k+2 here? Like k, k+2 k+4, k+6...? Please help me. I'm not confident ...
*Friday, April 27, 2012 at 6:09pm by Tabby*

**Physics**

if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics - bobpursley, Saturday, November 20, 2010 at 4:06pm power= work/time= mass*g*distance/time mass= power*time/...
*Saturday, November 20, 2010 at 8:04pm by michelle quendarsv*

**Physics**

When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, its frequency is 12 Hz. When another object of mass m2 is hung on the spring along with m1, the frequency of the motion is 4 Hz. Find the ratio m2/m1 of the masses. For ...
*Monday, April 23, 2007 at 10:46pm by Papito*

**Physics - Repost**

I am reposting the this question. Find the current in the 10.0 ohm resistor in the drawing (V1 = 21.0 V and R1 = 27.0 ohms). The drawing is in the shape of a rectangle that has one straight line down the center. On the left top line is R1; on the right top line is 5.0 ohm; on ...
*Tuesday, September 11, 2007 at 11:18pm by Jim*

**physics**

A car weighing 9800 N travels at 30 m/s. What braking force (to the nearest whole number) brings it to rest in 100 m???? THNX BOBPURSLeY
*Monday, November 9, 2009 at 8:24pm by JUan*

**acceleration estimate(bobpursley)**

Well, bobpursley explained this to me. I didn't understand this well. Since there was an error in the data, I am posting it again t(sec) v(ft/sec) 1 12.2 1.5 13 2 13.4 2.5 13.7 velocity of an object moving along a line at various times. How do I estimate the object's ...
*Monday, December 11, 2006 at 10:31pm by Jen*

**Physics with work, pls help**

A proton is moving in a circular orbit of radius 11.8 cm in a uniform magnetic field of magnitude 0.232 T directed perpendicular to the velocity of the proton. Find the orbital speed of the proton. Answer in units of m/s. I came up with .118/2.83x10^-7 and it was incorrect. (...
*Friday, April 15, 2011 at 12:26pm by cr*

**Re: PHYSICS**

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to the flatcar. What is ...
*Tuesday, February 27, 2007 at 1:00am by COFFEE*

**Chemistry!! - bobpursley please**

Calculate the maximum wavelength of light capable of removing an electron for a hydrogen atom from the energy state characterized by the following when n=4 =__________nm Responses Chemistry!! - bobpursley, Wednesday, October 22, 2008 at 4:05am So the two energy states are n=4 ...
*Wednesday, October 22, 2008 at 6:40pm by Giznelbell*

**algebra 2**

Posted by hellogoodbie on Saturday, January 16, 2010 at 3:24pm. Posted by hellogoodbie on Saturday, January 16, 2010 at 2:59pm. How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and ...
*Saturday, January 16, 2010 at 4:03pm by hellogoodbie*

**Physics bobpursley**

Give some examples of applications that resulted from work done by physicists on superconductivity? Don't understand this. I only got wires as an answer which totally doesn't seem correct.
*Wednesday, September 7, 2011 at 9:24pm by Anonymous*

**Physics/Math**

A single force acts on a 5.0 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.0t - 4.0t 2 + 1.0t 3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to t = 2.0 s. For ...
*Saturday, March 3, 2007 at 2:11pm by Technoboi11*

**Physics - Frequency**

This is in reply to a previous post, I'm not really sure whether replies to posts that are several days old are viewed by anyone, so I'm reposting just in case. In reply to bobpursley's post, I just want to ask, how would you know how long it takes for the sound to reach you? ...
*Wednesday, January 27, 2010 at 9:59pm by Hailey*

**Physics**

if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics - bobpursley, Saturday, November 20, 2010 at 4:06pm power= work/time= mass*g*distance/time mass= power*time...
*Saturday, November 20, 2010 at 8:29pm by michelle quendarsv*

**phsyics**

Posted by MELANA on Thursday, October 18, 2007 at 5:14pm. An object in equilibrium has three forces exerted on it. A 30 N force acts at 90° from the x-axis and a 44 N force acts at 60° from the x-axis. What are the magnitude and direction of the third force? NO IDEA WHERE TO ...
*Thursday, October 18, 2007 at 6:55pm by MELANA*

**chemistry**

I need help with this question please help, I just don't understand it Fe3+ (aq), Ca2+ (aq) and Ba2+ are all present in the same solution. Fully describe a procedure whereby you could separate these ions from one another Mr Pursley posted this response, but I don't understand...
*Sunday, November 13, 2011 at 8:13am by Kali*

**Physics**

I have no idea how to do this. Anyone help? A cyclist passes a race check point at +5.5m/s and then accelerates ata constant rate of +.55 m/s^2. The cyclist forgot to check in at the check point, and after 20s turns back around to head back. How far did the cylist move from ...
*Thursday, October 8, 2009 at 1:37pm by me*

**Math**

At a quality control checkpoint on a manufacturing assembly line, 8% of the items failed check A, 10% failed check B, and 2% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a product failed check B, what is...
*Friday, November 6, 2009 at 9:00pm by Anna*

**Math**

At a quality control checkpoint on a manufacturing assembly line, 8% of the items failed check A, 10% failed check B, and 2% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a product failed check B, what is...
*Friday, November 6, 2009 at 9:21pm by Anna*

**Math**

At a quality control checkpoint on a manufacturing assembly line, 8% of the items failed check A, 10% failed check B, and 2% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a product failed check B, what is...
*Friday, November 6, 2009 at 9:25pm by Anna*

**Math 157**

Can someone please help me. At a quality control checkpoint on a manafacturing assembly line, 10% of the items failed check A, 12% failed check B, and 3% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a ...
*Wednesday, December 8, 2010 at 9:51pm by Rena *

**calc: avg value**

Find the average value of the function "f(x) = x^2 sqrt(1+x^3)" on the interval [0,2]. and this is what i did.. please check for mistakes. thanks :D f(x) = x^2 sqrt(1+x^3), [0,2] f ave = (1/(b-a))*inegral of a to b for: f(x) dx f ave = (1/(2-0))*integral of 0 to 2 for: x^2 ...
*Monday, July 2, 2007 at 2:58pm by COFFEE*

**Math**

Can someone please help me. At a quality control checkpoint on a manafacturing assembly line, 10% of the items failed check A, 12% failed check B, and 3% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a ...
*Wednesday, December 8, 2010 at 8:37pm by Rena *

**Physics to bobpursley or any1 else who knows this**

A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet's mass is 2....
*Thursday, February 23, 2012 at 11:00pm by Angelina*

**physics multiplying vectors**

n the product F = qv · B , take q = 4, = 2.0i + 4.0j + 6.0k and = 136i -176j + 72k. What then is in unit-vector notation if Bx = By? ~~may i get some assistance in this problem? so far.. i tried this.. 136i-176j+72k = 4(2.0i+4.0j+6.0k)(B) 136i-176j+72k = (8i+16j+24k)(B) [(136i...
*Thursday, March 29, 2007 at 9:43pm by sam*

**physics**

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period? physics - bobpursley, Thursday, February 3, 2011 at...
*Thursday, February 3, 2011 at 9:17pm by help*

**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
*Tuesday, July 17, 2012 at 6:01am by thank *

**math**

At a quality control checkpoint on a manufacturing assembly line, 8% of the items failed check A, 10% failed check B, and 2% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a product failed check B, what is...
*Saturday, January 9, 2010 at 1:48am by crystal*

**Math**

At a quality control checkpoint on a manafacturing assembly line, 10% of the items failed check A, 12% failed check B, and 3% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a product failed check B, what ...
*Wednesday, December 8, 2010 at 8:43am by Rena *

**Math**

At a quality control checkpoint on a manafacturing assembly line, 10% of the items failed check A, 12% failed check B, and 3% failed both checks A and B. a. If a product failed check A, what is the probability that it also failed check B? b. If a product failed check B, what ...
*Wednesday, December 8, 2010 at 3:07pm by Rena *

**eth**

how do you think slavery influenced the evolution of both black and white america today? is there any websites that might help me with this question? As I was starting to answer your question, I had a conversation with BobPursley. He has summed this answer up better than I ...
*Tuesday, September 12, 2006 at 2:43pm by jenny*

**drwl please check**

a skateboarder moving at v = 5 m/s along a horizontal section of a track that is slanted upward by 48° above the horizontal at its end, which is h = 0.52 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction ...
*Tuesday, February 27, 2007 at 8:55pm by Mary*

**Algebra**

Hello, can someone help me solve and check the following 1) x - 8 = 20 Check: 2) x + 15 = 35 Check: 3) -x +6 = 3 Check: The symbol 'x' is in italic. If I can understand the symbols better, I belive I can get the hang of the course.
*Friday, January 8, 2010 at 7:32pm by Tamir*

**Physics**

n the figure take q1 = 22uC and q2 = 20u. The force on q_1 points in the - x direction, What is the magnitude of the force on q_1? q3 = 20uC. I dont know where to start, can someone help me? Responses Physics - bobpursley, Thursday, August 13, 2009 at 11:21am You have to know ...
*Saturday, August 15, 2009 at 2:58pm by Adam R*

**Algebra**

Hello, can someone tell me if I got the following solve and check work correct? 1. solve and check 1/2x = 3 5/6 1/2x = 3 5/6 1/2x = 23/6 3x = 23/3 x = 23/3 And to check for it 1/2x = 3 5/6 1/2x = 23/6 46x = 6 x = 6/46 x = 3/23 2. Solve and check 3x + 2 / 2 = 7 3x + 2 / 2 = 7 ...
*Tuesday, April 13, 2010 at 11:24pm by Tamir*

**Physics/Math**

What work is done by a force (in newtons) F = 3.1xi + 3.1j, with x in meters, that moves a particle from a position r1 = 2.1i + 2.5j to r2 = - -4.9i -3.9j? For Further Reading * Physics/Math - bobpursley, Thursday, March 1, 2007 at 6:27am Work is the dot product of Force and ...
*Saturday, March 3, 2007 at 2:10pm by Technoboi11*

**physics-bobpursley/drwls**

Good morning! I just wanted to say thank you for all of your help. This was my first time taking Physics ever and it was like a foreign language to me. For a long time during this semester I had an "F" average, because of you both I have passed my physics class with a "C". ...
*Tuesday, May 15, 2007 at 8:12am by Mary*

**Calculus--> bobpursley**

How do you get m=0? from taking the second derivative? does c=1? Can you check my work on how I get the derivative of R=M^2(c/2-m/3) NEXT R=1/2(CM^2)-1/3(M^3) NEXT dR/dM=CM-M^2. I checked in the back, and that was the answer for the first part of the equation. Isn't the ...
*Wednesday, May 30, 2007 at 6:34pm by Anonymous*

**For MathMate or bobpursley - check this**

Can somebody take a look at this? http://www.jiskha.com/display.cgi?id=1318555635
*Thursday, October 13, 2011 at 11:08pm by Reiny*

**Physics, still don't get it!**

Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a negligible mass. The area of the piston is 3.06 10-2 m2, and the pressure outside the cylinder is 1.02 105 Pa. Heat (2109 J) is ...
*Wednesday, April 18, 2007 at 10:30pm by Mary*

**bobpursley**

thank you. :)
*Monday, January 1, 2007 at 8:17pm by jasmine20*

**Bobpursley for this question please, physics**

I dont understand though why you can make w/mlambda I thought it was the otherway around? (in regards to this w/N sinTheta= m lambda N= w/(m lambda) * sinTheta N= w/(m lambda) * x/L
*Tuesday, December 11, 2007 at 8:50pm by URGENT*

**Physics check**

I just want somebody to check my answer on this problem please :-) There is a box which weighs 1000 kg. There is an applied force acting upon it with a force of 20000 N (horizontally). The mu is 1.2. What is the acceleration (again, horizontally) of the object? I got 8.24 m/s^...
*Monday, November 5, 2007 at 10:55pm by Emily*

** TO BOBPURSLEY**

CAN YOU HELP ME IN ETHNICS
*Thursday, November 2, 2006 at 8:51pm by MINEMINE*

**Math**

Thank you Bobpursley
*Thursday, September 10, 2009 at 7:29pm by Sam*

**to bobpursley**

thank you so much!
*Wednesday, April 18, 2012 at 8:55pm by Celest*

**math**

Can anyone help with combining like terms? The question - 11 + 5t^2 + t + 6t. I don't have a clue were to begin. Wouldn't it be toget all the T's together? Would 5t^ go with it also since it is an exponent? I think so I am not sure but I think it would be that.Let me check ...
*Thursday, November 2, 2006 at 6:53pm by lily*

**Chem- bobpursley**

What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p chem - bobpursley, Tuesday, September 21, 2010 at 6:48pm That is what I would do also. But I ...
*Tuesday, September 21, 2010 at 8:39pm by Sara*

**chemistry-mostly for bobpursley- I have a question**

ok i made a post with this question earlier: A carbon nucleus has six protons and six neutrons. How many electrons would it take to equal the mass of a carbon nucleus? u responded with this formula: 6*massproton+6*masscarbon=n*masselectron look up the three masses, solve for n...
*Monday, September 20, 2010 at 5:44pm by Sarah*

**Physics repost please check**

Posted by Mary on Monday, November 5, 2007 at 8:21pm. Suppose that the electric field of an electromagnetic wave decreases in magnitude. Does the magnetic field increase, decrease, or remain the same? Account for your answer. For Further Reading Physics - bobpursley, Monday, ...
*Tuesday, November 6, 2007 at 11:41am by Mary*

**bobpursley**

Thank You very much.
*Friday, March 28, 2008 at 7:59pm by Ella*

**TO BOBPURSLEY**

I have responded
*Sunday, September 13, 2009 at 9:38pm by AP Physics B*

**Honors Chem B**

Thank you bobpursley!
*Thursday, September 1, 2011 at 9:23pm by Deahna*

**to bobpursley**

is this the correct answer: 2m^-8n^-2/9m^2n^-6??
*Sunday, September 8, 2013 at 8:30pm by Sophie*

**Physics - bobpursely**

State the number of significant figures. 1) 809 Answer : 3 2) 0.0060 Answer : 5? 3) 0.00000095 Answer : 9? 4) 5.60 Answer : 3 5) 5.743 Answer : 4 6) 0.010 Answer : 4? Physics Help - bobpursley, Sunday, September 11, 2011 at 4:59pm 2, 3, 6 are wrong: Zeroes to the left of ...
*Sunday, September 11, 2011 at 5:14pm by Anonymous*

**Atomic physics**

5)a. Electrons accelerated by a potential difference of 12.23 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. b. Calculate the wavelength of light emitted with the shortest possible ...
*Monday, April 14, 2008 at 10:59pm by Sandhya*

**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) ...
*Saturday, January 16, 2010 at 11:31am by Sarah N H*

**algebra 2**

Posted by hellogoodbie on Saturday, January 16, 2010 at 2:59pm. How is this problem done? IF f(x)=2x^2-8x-3 FIND f(-2) algebra 2 - bobpursley, Saturday, January 16, 2010 at 1:42pm Put in for x the value -2, and compute f(-2) algebra 2 - hellogoodbie, Saturday, January 16, 2010...
*Saturday, January 16, 2010 at 3:24pm by hellogoodbie*

**Physics please check**

Please tell me where i went wrong. During an all-night cram session, a student heats up a one-half liter (0.50 10-3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19°C, and the beaker is filled to the brim. A short time later when the student returns, ...
*Friday, April 13, 2007 at 10:17pm by Mary*

**physics**

light travels from ethanol intro crown glass. what's the brewster angle in this situation? illustrate your answer with a light ray diagram. what's the signifcance of this angle of incidence? n1=1.36for ethanol nR=1.52 for crown glass tanangleB=nR/ni =1.52/1.36 =1.12 (48.2 ...
*Saturday, January 16, 2010 at 5:48pm by Lora*

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