Thursday

July 24, 2014

July 24, 2014

Number of results: 55,498

**Bobpursley can you help me with my problems below?**

I had problems from yesterday but I still don't get them can you help?do you want me to repost? repost: I cant find them.
*March 4, 2007 by Margie*

**Science [repost]**

What is the difference between an ionic bond and a covalent bond? I just keep forgetting which one is which...any easy way to remember these? PS> I know that you're not supposed to repost until 24 hours but I really need this answer! Thanks -MC
*February 5, 2009 by mysterychicken*

**english**

Homework Help Forum: brain teaser help Current Questions | Post a New Question Answer this Question | Further Reading Posted by sam on Sunday, April 2, 2006 at 3:34pm. try to find the error. I couldn't; it's very hard. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z did ...
*September 10, 2006 by chris*

**Just a repost, in case the old isnt seen**

sorry! I never noticed..the mass should be 52000kg sorry about that! For Further Reading physics repost - Alexis, Sunday, October 14, 2007 at 6:07pm so it should be a 52000kg train slows from 25 m/s to 14m/s in 5.0 s. Calculate the work done on the train. so I found the ...
*October 14, 2007 by Alexis*

**history**

on the 1st page can someone please help me??????? Its the 2nd and 3rd black dot next to my nasme. Even if this is a repost, more information needs to be given before we can adequately respond. Please repost with more information. Thanks for asking.
*April 29, 2007 by Mack*

**physics repost**

Calculate the force of gravatational attraction between two spheres of mass 10.1 kg and 45.4 kg that are 38.5 m apart. F = G(m1)(m2)/r^2 = 6.67 x 10^-11(10.1)(45.4)/38.5^2 = 2.06 x 10 ^-11 N
*April 3, 2008 by Jon*

**physics repost**

A 1.00-kg ball is attached to a string of 0.50 m and swung in a horizontal circle with a velocity of 2.00 m/s. Find the centripetal acceleration. ac=v^2/r = 2.00^2/.50 = 8.0 m/s^2
*April 3, 2008 by Jon*

**physics repost**

Which of the following physical properties can be used to measure temperature using a thermometer? A)volume B)pressure C)density D)viscosity I got A
*April 4, 2008 by Jon*

**algerba!2!**

(-2x2y)3 * (5xy3)2 *I don't get this on at all!!! Are there any exponents in this one? If so, repost showing the caret to indicate the exponent. oh sorry I forget to do that.LOL!Here it is now: (-2x^2y)^3 * (5xy^3)^2 Are there any exponents in this one? If so, repost showing ...
*November 8, 2006 by Sandro!*

**physics repost**

Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2. F
*April 19, 2008 by chris adison*

**Repost physics**

PLEASE SOMEONE HELP ME!! I POSTED DOWN AT AROUND 10 something!! PLEASE!!! I NEED HELP!!!
*September 30, 2007 by Cooper-Nichol*

**physics repost**

sorry! I never noticed..the mass should be 52000kg sorry about that!
*October 14, 2007 by Alexis*

**Repost repost physics**

Posted by Meredith Mcneeds Help! on Monday, November 19, 2007 at 8:08pm. Hey, ok so I am supposed to be helping my cousin this with this physics problem, and this is the only one that has ever stumped me! Neutral metal spheres A and B each of mass 0.2 kg hang from insulating ...
*November 19, 2007 by Meredith Mcneeds Help!*

**physics repost**

A force of 200 N acts on a 7.20-kg bowling ball for 0.350 s. Calculate its change in velocity. 7.20/0.350 = 20.57 m/s
*April 3, 2008 by Jon*

**To Lynn,Alex,Physics_student,Natasha**

Please refrain from reposting the same question within a short time (less than a day). If you do repost, add "repost" at the end of the subject. Quadruple posting within an hour and a half means that teachers have to spend time reading the extra posts, which actually slows ...
*October 6, 2009 by MathMate*

**physics repost**

Venus has radius 6.05 x 10^6 m and mass 4.87 x 10^24 kg. Calculate the value of acceleration due to gravity on Venus's surface. don't know this one
*April 3, 2008 by Jon*

**physics repost**

A 1600 kg vehicle moves with a velocity of 19.5 m/s. Calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s. I don't know this one the only thing I know is p=w/t
*April 4, 2008 by Jon*

**Physics 1 **

This is a repost....:Two small particles of mass 16 kg and 27 kg are a distance 1.4 m apart. What is the gravitational force of one of these particles on the other?_____N
*October 4, 2012 by John *

**physics repost**

How much work is a 200 kg weightlifter doing while he holds a 1000 kg barbell stationary .75 m over his head? 1000(.75) = 7350 J
*April 4, 2008 by Jon*

**physics repost**

What should be the angle between two vectors of magnitudes 3.20 and 5.70 units, so that their resultant has a magnitude of 6.10 units? cos=a^2+b^2-c^2/2ab cos10.24+32.49-37.21/(2*3.20*5.70) = 99 degrees
*April 16, 2008 by Anonymous*

**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...
*April 17, 2011 by please, help me *

**Physics - REPOST**

A styrofoam ball covered with a conducting paint has a mass of 5.0 x 10 ^-3 kg and has a charge of 4.0 microcoulombs. What electric field directed upward will balance the weight of the ball?
*September 11, 2007 by Stephanie*

**physics repost**

A 75 kg skydiver dives out of her airplane 3000 m in the air. How much potential energy will she have left 1/4 of the way down? PE=mgh 75(3000)(.25) = 5.5 x 10^5
*April 4, 2008 by Jon*

**physics repost**

If Earth shrinks in size such that its shape and mass remain the same, but the radius decreases to 0.21 times its original value, find the acceleration due to gravity on its surface. (6378.1/0.21)(9.80) = 2.97 m/s^2
*April 3, 2008 by Jon*

**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, ...
*November 6, 2007 by Mary*

**Science [improv/repost]**

What is the difference between an ionic bond and a covalent bond? I just keep forgetting which one is which...any easy way to remember these? PS> I know that you're not supposed to repost until 24 hours but I really need this answer! Would this answer work?: In an ionic ...
*February 5, 2009 by mysterychicken*

**physics**

if a motorboat travels at 25km/hr down a river whose velocity is 4km/hr wgat is the boats actual velocity? a. 21km/hr b. 29km/hr c. 100km/hr d. 6.2km/hr please repost the answer
*March 18, 2008 by michelle*

**physics repost**

True/False The thermal energy of the particles in a gas is related to the temperatureof the gas. answer:true
*April 4, 2008 by Jon*

**Physics repost**

A cannon is fired from a cliff 190 m high downward at an angle of 38o with respect to the horizontal. If the muzzle velocity is 41 m/s, what is its speed (in m/s) when it hits the ground? I keep getting 64.28 m/s as my answer, but it's not right. Could someone tell me exactly ...
*November 9, 2007 by Lindsay*

**Pre-Algebra [repost]**

I'm sorry I had to repost, but this is urgent and i need it done by today!! Can someone please show me how to do these problems? I've been trying but I'm having a hard time... 1.Simplify the expressions on each side of the equation to obtain an equivalent equation: 5x + 12 + ...
*May 2, 2009 by mysterychicken*

**physics, error calculation repost**

I need to derive an error equation for Bohr's model to use in my physics lab this week. I am really bad at calculus, so if anyone can help me that would be really great. the equation is (1/lambda)=R[(1/n^2final)-(1/n^2initial)] I've never had to derive anything like this ...
*March 8, 2011 by Trace*

**REPOST**

CAN someone please give me a good idea as how to find information for this problem: we are supposed to relate physics to movies, and state mistakes or errors found in the movies based on physics principles. I am trying to do Willy Wonka the 1971 version...I need help trying to...
*December 8, 2007 by Please McHelp me!*

**Repost Repost Bio**

I asked this, and didn't get a very helpful response. Question: hi, i did this lab, from this website and I was wondering if anyone could come up with 3 sources of error, and they can't be human error. Thanks! You are saving me! Seeing as I am not allowed to post to the ...
*February 26, 2008 by InSANELY URGENT(Science teacher help)*

**physics repost**

1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
*April 19, 2008 by chris adison*

**physics repost**

A cable pulls a crate of mass 19.0 kg across the floor in 6.8 s. If the total distance traveled is 5.40 m, find the power used by the cable. w=md 186.2(5.40) w= 1005.48 p=w/t p=1005.48/5.40 answer: 147.9 W
*April 4, 2008 by Jon*

**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. ...
*April 20, 2007 by Mary*

**physics EM repost**

Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.50-mm-diameter superconducting wire. What size current is needed? Thanks in advance
*March 31, 2008 by Spencer*

**physics repost**

True/False 3)The position-time graph of an object moving with a constant average velocity is always a straight line. True 4)A time interval is a scalar quantity. True
*March 31, 2008 by Jon*

**physics repost**

A student lifts a 1.2 kg bag from her desk, which is 0.59 m high, to a locker that is 2.9 m high. What is the gravitational potential energy of the bag relative to the desk? PE=mgh 1.2(9.80)(2.9) = 34.1
*April 4, 2008 by Jon*

**physics repost**

True/False A hot object has more thermal energy than a similar cold object only because of greater kinetic energy. answer:true
*April 4, 2008 by Jon*

**My algebra repost**

1)
*April 18, 2007 by Antonio*

**math (repost)**

y =x+2 y =x^2
*April 8, 2008 by michael*

**physics repost**

How much heat must be removed from 0.15 kg of water to cool it from 95 d/C to 25 d/C? The specific heat capasity of water is 4182 J/kg-k. mC(T1-T2) 0.15(4182)(70) = 4.4 x 10^4 J
*April 4, 2008 by Jon*

**PHYSICS-repost**

A small glass bead has been charged to +19 nC. A metal ball bearing 1.0 cm above the bead feels a 0.030 N downward electric force. What is the charge on the ball bearing?
*March 23, 2010 by deb*

**Physics repost**

A wave traveling in the +x direction has an amplitude of 0.45 m, a speed of 6.1 m/s, and a frequency of 16 Hz. Write the equation of the wave in the form given by either Equation 16.3 or 16.4. (Answer in terms of t and x. Assume standard units.) For Further Reading Physics - ...
*April 30, 2007 by Mary*

**Physics**

Sorry for the repost, i made a typo in the original post's subject. A dry water well is 1.5 m in radius and 5.0 m deep. In order from lowest to highest, the fifth resonant frequency of this well is closest to ... I know that it is an open-closed system, but how would we take ...
*January 27, 2010 by Sammy*

**About Posting**

sorry for repost ~C
*August 16, 2007 by ~christina~*

**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, ...
*June 22, 2009 by jane*

**Physics repost**

A 2 kg otter starts from rest at the top of a muddy incline 85 cm long ans slides down to the bottom in 0.5 s. What net external force acts on the otter along the incline? I know which equation I need to use. But how can I use the cm and s to get the acceleration?
*November 14, 2007 by Lindsay*

**physics repost**

I am still trying to solve for H in this equation but I am still lost MgH = (1/2)*k*(H-2-10)^2 + Mg*2 I was told to expand the square on the right, gather terms, put it in the standard quadratic form, and use the quadratic formula, but I don't know how. Should it be Mgh=(H-12...
*April 24, 2008 by Chris Adison*

**physics repost**

I am still trying to solve for H in this equation but I am still lost MgH = (1/2)*k*(H-2-10)^2 + Mg*2 I was told to expand the square on the right, gather terms, put it in the standard quadratic form, and use the quadratic formula, but I don't know how. Should it be Mgh=(H-12...
*April 24, 2008 by Chris Adison*

**DrRuss/bobpursley/drwls please help!!!**

Can you please clarify your response to my post Wednesday April 4th at 8:53pm and 8:54pm. Thanks for all of your help!!! pleasde repost it. Yes, repost it. Go to it, copy, and paste it here. Thanks. A vertical spring with a spring constant of 450 N/m is mounted on the floor. ...
*April 6, 2007 by Mary*

**math (repost)**

if f(x)=2x-1 and g(x) 1/2 (x+2) calculate a)f(3) now if 2(3)-1=5 how do i find for gf(3)????
*April 14, 2008 by cassie*

**algebra repost**

simplify radical sqrt a^10
*July 24, 2009 by Melissa*

**To Danii**

I cannot read your 11:55 post. Can you repost it here?
*May 20, 2010 by Jen*

**english**

sorry i havent really used this site and im not sure how to repost my question instead of putting it as an answer to my question so heres the repost: I had to find embedded clauses I deplore the fact that bats have wings. --> bats have wings That Guinevere loves Lorian is ...
*July 7, 2008 by Anonymous*

**Repost-Physics 1**

A crate of mass 48 kg is pushed up a frictionless ramp by a person as shown in the figure below. Calculate the work done by the person in pushing the crate a distance of 11 m as measured along the ramp. Assume the crate moves at constant velocity. _____J
*October 9, 2012 by John*

**DrBob222 physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 27.2 ° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 53.7 kg, and the coefficient of kinetic friction ...
*February 19, 2007 by Susu*

**Abby**

Please repost your question, I accidently deleted it.
*April 9, 2008 by bobpursley*

**6TH GRADE MATH**

Repost perimeter is 30 and area 36
*November 29, 2010 by William*

**algebra 117**

repost sorry about that (k^1/8)^-4 oer(k^7)^1/2
*July 22, 2012 by BERNIE*

**Repost-Physics 1**

A horizontal force of 30 N pulls a block of mass 2.5 kg across a level floor. The coefficient of kinetic friction between the block and the floor is ìK = 0.25. If the block begins with a speed of 2.0 m/s and is pulled for a distance of 18 m, what is the final speed of the ...
*October 9, 2012 by John*

**physics-repost**

An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^-13W/M^2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 8.5nn and the light has a wavelength of 510nm? Can anyone please ...
*April 26, 2008 by Stephy*

**Physics - repost**

A satellite has a mass of 5381 kg and is in a circular orbit 4.30 105 m above the surface of a planet. The period of the orbit is 2.06 hours. The radius of the planet is 4.09 106 m. What would be the true weight of the satellite if it were at rest on the planet's surface?
*October 9, 2012 by Ben*

**History opinion repost for Kate**

Is the Bayeux Tapestry an accurate source? Why or Why not?
*April 28, 2009 by Ms. Sue*

**Math (repost)**

Given f(x) and g(x)=f^-1(x). If f(1)=4 and f'(1)=-3, then find g'(4). ...No idea where to start with this. Please help? Thanks much!
*April 27, 2010 by Nikki*

**Algebra(repost of one question)**

Bobpursley: 89. Solve for x in the equation: (6/7)x - 6 = -2 I got x=28/3
*May 1, 2010 by y912f*

**Algebra (repost)**

Can you help me on this problem as well? (or anyone.) Solve each inequality and check your solution. h - > -7 4 (bumping)
*May 10, 2010 by Dean*

**physics repost**

A quantity of an ideal gas is compressed to half" its initial volume. The process may be adiabatic, isothermal or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. doesn't adiabatic mean no work, so it would be the ...
*June 23, 2009 by jane*

**Physics repost**

Four resistors of 10.0 each are connected in parallel. A combination of four resistors of 10.0 each is connected in series along with the parallel arrangement. What is the equivalent resistance of the circuit? A)80.0 B)40.4 C)40.0 D)42.5 This is all I understand. Can you ...
*April 9, 2008 by Jon*

**Repost 2 PLz Help**

6-y/y^2-2y-24=? *I don't get it at all!!! You need parentheses around portions of this thing so we know what the problem is.
*February 20, 2007 by steve the hippo*

**repost Calculus**

the length of the curve of intersection of the cylinder (4x^2) + y^2 = 4 and the plane x + y + z = 2 I'm so lost. Any help is appreciated!
*April 24, 2009 by Anonymous*

**Algebra**

|a+2 3z+1 5m|+|3a 2z 5m|=|10 -14 80| |4k 0 3 | |2k 5 6| |10 5 9| I needed to repost this. This is a matrice and I am trying to find the values of the variables in each equation.
*December 17, 2009 by mike*

**Physics Repost**

Hey, ok so I am supposed to be helping my cousin this with this physics problem, and this is the only one that has ever stumped me! Neutral metal spheres A and B each of mass 0.2 kg hang from insulating wires that are 4.0 m long and are initially touching. An identical metal ...
*November 19, 2007 by Meredith Mcneeds Help!*

**physics repost**

The electricity received at an electric substation has a potential difference of 2.80 x 10^5 V. If the required output is 440 V, what should be the ratio of the turns of the step-down transformer? I know the transformer equation is: Is/Ip = Vp/Vs = Np/Ns "use that equation to ...
*April 18, 2008 by Anonymous*

**ethnics help**

sorry to interrupt is someone available for help. Please repost with your question, and we will do our best to help. Thanks for asking.
*November 2, 2006 by minemine*

**Science repost for help**

Sciece (chemistry) - help, Tuesday, September 25, 2007 at 4:32pm what is the particle theory
*September 25, 2007 by Ms. Sue*

**REPOST biochem**

i don't understand this why can carboxyl and phosphate groups act as acids? as in, what makes an acid?
*October 18, 2007 by J*

**Physics repost**

George has a bar magnet and a coil connected to a battery. To perform an experiment, he needs to use different values of current through the wire. How can he generate different values of electric current through the wire without connecting any other device in the circuit?
*June 4, 2008 by BAdams*

**physics repost**

)An elevator is moving down with an acceleration of 1.40 m/s^2. A 14.5 kg block hangs from a spring balance fixed to the roof of the elevator. What is the apparent weight of the block? m*g+m*a 14.5*9.80+14.5*1.40 142.1+20.3 162.4 N 2)A 2.7 kg box is released on a horizontal ...
*April 16, 2008 by Anonymous*

**Physics repost please clarify**

The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding ...
*October 16, 2007 by Mary*

**physics repost**

Raul pushes a stalled car with a force of 204 N. If the required force decreases at a constant rate from 204 N to 44.0 N for a distance of 16.3 m in 16.0 s, calculate the average power required to move the car. 204-44=160 160*16.3/16 2608/16 answer: 163 W
*April 4, 2008 by Jon*

**Physics repost**

Suppose you wish to make a solenoid whose self-inductance is 1.2 mH. The inductor is to have a cross-sectional area of 1.2 10-3 m2 and a length of 0.048 m. How many turns of wire are needed? Can you please clarify this for me. When I first post it my reponse was: # turns= # of...
*October 9, 2007 by Mary*

**Repost-Physics 1**

A skier of mass 109 kg travels down a frictionless ski trail. a)If the top of the trail is a height 218 m above the bottom, what is the work done by gravity on the skier? _____J b)Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts from...
*October 9, 2012 by John*

**egg protection**

how can i protect an from a 6m fall and make it go 3m please look at your question. It makes no sense to us. Repost it
*March 5, 2007 by chris*

**Science - Repost for ?????**

which moon is the brightest from the surface of jupiter? this question is driving me BLOODY crazy 4 my homework!
*June 24, 2008 by Writeacher*

**repost**

bobpursely, I posted at 709 from our previous dialogue, can you please help me again? Much appreciated!
*September 30, 2007 by RSVP*

**To Happy --**

Please repost your math question -- and remove Ms. Sue's and my screen names from YOUR NAME'S space. Thanks. =)
*February 8, 2009 by Writeacher*

**Grammar [Repost]**

Is this an adverb phrase? The tangy scent of barbeque drew us TOWARD THE LITTLE CAFE. Thanks -MC
*May 12, 2009 by mysterychicken*

**algebra repost**

Simplify each expression. Assume all variables represent nonzero real numbers. -40^0- 30^0
*July 24, 2009 by Melissa*

**Repost-Physics 1**

A car is pushed along a long road that is straight, horizontal, and parallel to the x direction. a)The horizontal force on the car varies with x as shown in the figure. What is the work done on the car by this force? (Let a = 100 N.) _____J b)What is the work done by gravity ...
*October 9, 2012 by John*

**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*

**English**

Bloom's taxonomy, anyone? (Yeah, it's a repost.) Anything found on the wiki or the first page of google I've tried.
*September 11, 2007 by Samantha*

**chemistry [repost]**

In a recrystallization of vanillin, can you purify a substance whose solubility decreases as the temperature increases? Any help is appreciated!
*June 23, 2008 by Anonymous*

**To "Cutie..."**

Please choose a better "First Name" -- make sure it's not offensive in the least! Then repost your question. Thanks. =)
*July 7, 2008 by Writeacher*

**MzLynn - auditory learning**

Your post has been removed. We'll be glad to help you if you repost it along with your attempts to answer the questions.
*January 17, 2009 by Ms. Sue*

**Physical Science**

if you tear a piece of material in haft, how is the density affected? sorry i repost it, just the title
*October 11, 2012 by Laruen*

**Physics repost**

A current of 5.0 A flows for 20.0 minutes through a bulb and delivers 15000 J of electric energy to the bulb. What is the potential difference across the bulb? A)2.5 V B)4 V C)100 V D)100 V (book typo) I was told to do this: energy= V*I*time in seconds solve for v. I don't ...
*April 9, 2008 by Jon*

**Pre Calculus Repost Please Help**

Can someone help me solve this problem: cos^2x + 5cosx - 2= 0 I am having some trouble finding x
*February 5, 2009 by Anonymous*

**To Ray -- college**

I've removed your biotechnology post. Please repost it with your thoughts about completing it and specifically how you would like us to help you.
*February 17, 2009 by Ms. Sue*

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