Tuesday

October 25, 2016
Total # Posts: 821

**Physics**

A 150g fircracker is thrown at 66km/h . It explodes in the air into two pieces, with a 42g piece continuing ahead at 93km/h.How much energy is gained in the explosion by the two pieces. I know you use k=1/2mv^2 though, do you use m1v1+m2v2=(m1+m2)vf I am getting something like...

*April 13, 2009*

**Physics**

Object A crashes into object B. A is more massive than B. Which is a true statement? a. A experiences an impulse b. B experiences an impulse c. Both A and B experience an impulse of equal magnitude d. Both A and B experience an impulse, but the impulse on B is greater I say C.

*April 12, 2009*

**Physcis**

Two trucks approach at the same speed and undergo an inelastic collision. Their total momentum? a. becomes zero b. remains unchanged c. doubles d. I need to know the masses of the two cars I say B.

*April 12, 2009*

**Physics**

Two rollerbladers throw a frisbie back and forth on a frictionless surface. Which does not change? a. Momentum of an individual rollerblader b. Momentum of the frisbie c. Momentum of the system consisting of the frisbie and rollerbladers throwing the ball d. Momentum of the ...

*April 12, 2009*

**Calculus**

Find the force on a hollow dome that is 1000 feet in diameter, that is a mile below the surface. HOw large can the dome be expanded and not surpass 600 billion pounds. I know the height will be 500, and i think that the intergral is 5280 to 4780 int 64,000pih, I am not sure ...

*April 11, 2009*

**12th grade**

Area of the house to be painted = A Bill pains "B" area per hour John pains "J" area per hour So, A/B = 4 hours, and A/J = 7 hours => B = A/4 and J = a/7 B and J says how much area they can paint per hour. When both of them work together, assume it takes...

*April 9, 2009*

**Physics**

wHAT DO I DO WITH THESE VALUES THEN...

*April 7, 2009*

**Physics**

A 69 kg roller blader, is on a frictionless surface at rest, he then tosses a 4.0 kg rock that has a velocity given by v=3i+4jm/s, the axes are both in the horizontal plane. Find the x component and y component of the subsequent velocity of the roller blader? I think tis is a ...

*April 7, 2009*

**11th grade-Calculas**

dD/dt = A(2pi/365)*cos [(2pi/365)*(t-80)] =0 for maximum or minimum (2pi/365)*(t-80) = n*pi/2 when n=1 gives maximum , then (t-80) = 365/4, for minimum n = 3 and t-80 = 3*365/4 (3) = dD/dt = +2/60 (4) = dD/dt = -2/60

*April 5, 2009*

**5th grade math problem**

write each number in standard form thirtytwo million,tenthousand one

*March 30, 2009*

**CHEMISTRY**

thanks i didn't really get molarity either but my question is for molality.

*March 16, 2009*

**CHEMISTRY**

i don't really understand molality. I know that it is a big concept but could someone explain it a little. the question is how would you prepare a molality solution.

*March 16, 2009*

**history**

A. putting more money into circulation. The reason I know the answer is correct is because I just took a test and got that same exact question right!!! ;)

*February 22, 2009*

**Math**

If x is a natural number then,(x+5)/5=x+1

*February 20, 2009*

**Math**

If x is a natural number, then (x +4)^2 =x +16

*February 20, 2009*

**Math**

i got 14

*February 20, 2009*

**math**

HE GRATED IT LOL

*February 18, 2009*

**Algebra II**

How do I evaluate log base 8 of 4?

*February 15, 2009*

**Chem**

4.5 × 10−12 m

*February 9, 2009*

**English:writing memo**

Good example

*February 2, 2009*

**Science**

I need facts about coral reefs

*February 1, 2009*

**Poem: A Voice by Pat Mora**

what does the daughter feel about her dad fear, amusment, and love or what? etc......

*January 26, 2009*

**Poem: Hanging fire by Audre Lorde**

i think she has breast canswer

*January 24, 2009*

**crt 205**

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion and gravitation in ...

*January 9, 2009*

**Technology**

For my final exam I must build a paper tower that stands at least 60+ inches. These are what I can use. -One sheet of paper (8.5x11) -Two feet of tape -Pencil -Ruler I can't seem to find the correct way to do this anywhere on the internet, so can I get some help here?

*January 9, 2009*

**conversion**

thanks but how would i show my work using dimensional analysis. like.. 11 L x ?/? = gal in that form

*January 2, 2009*

**conversion**

what is the easiest way to convert 11 liters to gallons

*January 2, 2009*

**social studies**

what is a government in which citizens rule through elected representatives?

*December 17, 2008*

**science**

because vibration causes noises and in an earthquake, there is a lot of vibraion

*December 7, 2008*

**MATH**

hmm...i need help on this problem, anyone know how to o this? (if u can, put a step-by-step solution) i would really be grateful. the coordinates of two points are A(-2,6) and B(9,3). find the coordinates of the point C on the X-axis so that AC=BC

*December 7, 2008*

**Pigskin Geography**

A game between two of the competing teams from bordering states might well be called the "Kudzu Klash". The game between which teams would deserve this title?

*November 30, 2008*

**Science**

how could you identify a pure metal if you have a balance, a graduated cylinder and a table of densities for metals?

*November 18, 2008*

**language arts**

can you please help me unscramble these words. nnreital cicnoflt reexatln ciclontf yucataid enruta

*November 3, 2008*

**HHHHEEELLLPPP**

what does abs mean

*October 16, 2008*

**HHHHEEELLLPPP**

thank you

*October 16, 2008*

**HHHHEEELLLPPP**

no it cant be the answer were suppose to have 2 answers

*October 16, 2008*

**Algebra 1**

were solving absolute value equations \can you help me out in 1 8-|3x-2|=3 i don't know if we distribute the negative or make it into -1 or its a no value something like that theirs no possible answer

*October 16, 2008*

**7th grade**

Jasmine's quarters total $2.80 more than her nickels, of which she has half as many as she has dimes, which total 80 cents more than her quarters.

*October 14, 2008*

**science**

what is velocity

*October 6, 2008*

**Social Studies**

Caused the isrealites to leave Canaan and go to egypt

*October 2, 2008*

**accounting**

Eric Sherm began working as a part-time waiter on April 1st, 2008 at Yard restuarant. The cash tips of 475 that he received during April were reported on form 4070, which he submitted to his employer on May 1st. During May, he was paid wages of 630.00 by the restuarant. ...

*September 22, 2008*

**Math**

ITS 88

*September 22, 2008*

**Math**

Find the equation of the straight line joining a)(4, 4) and ( 2, 0) b)(3, -1), (5, 4) i also need to know how you went about solving this problem so i can understand.. many thanks

*September 22, 2008*

**Math - Factors**

i need help

*September 10, 2008*

**Math - Factors**

What are improper factors? How do we find improper factors for any given numbers?

*September 10, 2008*

**math**

2+45

*September 9, 2008*

**algebra**

suppose h i equals the number of points lindsey scored in the ieth basketball game so far this season, and h1=14, h2=12, h3=18, h4=14, h5=18, h6=19, h8=16 which expression represents the mean number of points scored per game. a)7 E hi i=1/7 b)8 E hi i=1/8 c) 1 E hi i=8/8 d) 8 ...

*September 8, 2008*

**science**

what does technological development have to do with the development of time zones

*August 21, 2008*

**Science**

Name a tool that you can use to measure the volume of an object.

*August 20, 2008*

**computer education**

false, has to be connected to the internet

*August 20, 2008*

**Science**

Name a tool that you can use to measure the circumference of an object.

*August 20, 2008*

**science**

Name a tool that is used to measure the circumference of an object and Name a tool that you can use to measure the volume of an object.

*August 20, 2008*

**science**

why is the electron the part of the atom that moves when an electric current flows?

*May 23, 2008*

**Math**

no

*May 15, 2008*

**Computer Science**

I have defined a microscopic verson of scheme that utilizes amb. I am currently using Dr. Scheme. This is my definition: (define (amb-eval s environment succeed fail) (cond ((not (pair? s)) (succeed (cond ((eq? s '#t) '#t) ((eq? s '()) '()) ((eq? s '#f) &#...

*May 15, 2008*

**trig**

Find all angles of a right triangle RST given that r = 18cm and s=20 cm

*April 8, 2008*

**trig**

If a triangle has angles 35 and 65 degrees, what is the measurment of the third angle? Is it a right triangle?

*April 8, 2008*

**science**

at what speed did a plane fly if it traveled 1760 meters in 8 seconds

*April 8, 2008*

**math**

I do not see how Reiny went from: cosx(2sin^2x-1)/sinx TO (cosx/sinx)(-cos2x) if you break it up you get (cosx/sinx)((2sin^2x-1)/sinx) help im doing a take home exam lol

*April 4, 2008*

**science**

What is a maerial that was recently alive?

*March 12, 2008*

**math**

Can a polar bear go on a safari?

*February 26, 2008*

**Stoichiometry**

How much iron (II) sulfide would be needed to prepare 15L of hydrogen sulfide? My balanced equation is 2HCl + FeS --> H2S + FeCl2. I have converted 15L H2S to mols, but I have no idea where to go from here.

*February 24, 2008*

**Science**

what evidence would you look for in a chemical change

*February 23, 2008*

**math**

5 plus 5/10

*February 16, 2008*

**Algebra1**

ok thank you for all of your help

*January 29, 2008*

**Algebra1**

564t=744(t-.5) 564t=744t-372 564t-564t=744t-372-564t 0=180t-372 0+372=180t-372+372 372=180t 372/180=180t/180 2.07=t Is that correct?

*January 29, 2008*

**Algebra1**

no the second one left a half an hour later sorry i forgot to include that

*January 29, 2008*

**Algebra1**

A jet leaves the airport traveling at an average rate of 564km/h. Another jet leaves the same airport traveling at a rate of 744km/h in the same direction. How long will it take for the second jet to reach the first jet

*January 29, 2008*

**Math**

what is 3(x-4)-2(8-x

*January 17, 2008*

**Math**

Wha are the roots of x to the second power divided by x minus six equals Zero?

*January 13, 2008*

**science**

I have to come up with a question that i can turn in to a experiment need help please

*January 6, 2008*

**Math**

i have a question with my algebra hw about (7Xto the6*ytothe9)to the4/3xtothe 10*y to the 4

*December 17, 2007*

**geography**

Thank you Ms Sue.

*November 28, 2007*

**geography**

Thank you Ms. Sue. You really helped me.

*November 28, 2007*

**geography**

sammy goes out to play. his mother tells him to be home by 5:00. Sammy is almost an hour late, but he has an excuse. He says that he got lost. He tells his mother that when he checked his compass, it was pointing west,so he followed a path in that direction,but stillhad ...

*November 28, 2007*

**Physics**

Thank you very much.

*November 28, 2007*

**Physics**

A student throws a ball vertically upward such that it travels 9.0 m to its maximum height. If the ball is caught at the initial height 2.4s after being thrown, what is the ball's average speed? I know average speed is change in distance over change in time, but I don'...

*November 28, 2007*

**English**

Am I missing any important punctuation in this sentence: Scientists and doctors alike have only come up with one sound conclusion to date: based on what they’ve seen yet, the Ram is a creature which will no doubt affect the environment it lives in greatly, and it will not...

*November 22, 2007*

**English (Need help rephrasing)**

Thank you very much! It conveys exactly what I was trying to say.

*November 18, 2007*

**English (Need help rephrasing)**

Can you please help me rephrase this? I have completed over 150 volunteer hours at {name} Hospital. Delivering and filing medical transcriptions is one of my favorite jobs. Through this work, I was able to explore every part of the hospital while having the responsibility of ...

*November 18, 2007*

**history**

what is one aspect of brazilian life that reflects a mix of cultures?

*November 15, 2007*

**Physics**

What are some examples of the principles of mechanics in car crashes and car safety? I can only think of one, friction reducing the traction of the tires. Can you help me come up with two or three more examples? Thank you.

*November 13, 2007*

**CHEMISTRY**

What would be the uncertainty in velocity (miles/hr) of a neutron beam particle if the position can be measured within +/- 25 angstroms. The rest mass of a neutron = 1.67493 X 10^-27 kg or 1.008664904(14) amu. I know you have to use the heisenberg uncertainty principle: (...

*November 7, 2007*

**Math**

What web sites to go to to find information about integers

*November 6, 2007*

**Math**

i ment what is a number that divied by 3 has a remainder of 2 also that same number divided by 4 has a remainder 3 and that same number divided by 5 has a remainder of 4

*November 4, 2007*

**Math**

what is a number that divied by 3 has a remainder of 2 also that smae number divided by 4 has a remainder 3 and that same number divided by 5 has a remainder of 4

*November 4, 2007*

**English (very simple)**

What are some phrases similar to "Case in point"? Thank you very much.

*October 20, 2007*

**math**

How do you find the median?

*October 9, 2007*

**mult.**

66,059

*October 8, 2007*

**mult.**

what is: 9,436 x 7 ------

*October 8, 2007*

**science**

you're very welcome!!!!!

*October 8, 2007*

**science**

waves crush shells and stones to create sand

*October 8, 2007*

**Math**

thank you very much Ms.Sue!!!!!!!!

*October 8, 2007*

**Math**

A rectangle has a width if 10 inches and an area of 5 square inches. What is the length of the rectangle?

*October 8, 2007*

**6th Grade Statistics**

The student is correct because the median is used to find the middle numeric value of a data set, the mean balances out the data so all numbers in a data set are the same. This means that the mean and median can only be used for a numeric data, so this student is correct.

*October 2, 2007*

**6th Grade Statistics**

One student says you can only use the mode to describe categorical data, but you can use the mode, median, and mean to describe numerical data. Is the student correct? Why?

*October 2, 2007*

**Calculus**

Thank you very much, drwls. I actually understand it now! (You saved me in Calculus!) :-)

*September 30, 2007*

**Calculus**

My teacher showed our class how to find the graph of a derivative using tangent lines. I can not figure this out. I would really appreciate it if someone could help me or explain it to me. Thank you very much for your help.

*September 30, 2007*

**Calculus**

That's what I was looking for. Thank you very much.

*September 16, 2007*

**Calculus**

I'm not sure how to calculate limits from graphs. I've tried many times but I can't figure it out. Are there any sites or tips you can give me? Thank you very much, I really appreciate it.

*September 16, 2007*