Saturday

April 25, 2015

April 25, 2015

Total # Posts: 519

**physics**

A 2.0 kg particle is moving along the x axis to the left with a velocity of v= -6.0 m/s. Suddenly, between times t =0 and t = 4.0 x a net force = 3t^2 – 12t is applied to the particle, where F is in N and t is in s. Calculate the velocity of the particle at t=4.0 s. Is ...
*November 23, 2009*

**physics**

How do I calculate the momentum?
*November 23, 2009*

**physics**

One glider with a mass 0.2 kg and a speed of 3.5 m/s traveling east collides with another glider with mass 0.5 kg and a speed of 2.0 m/s moving west. They collide and stick together. Calculate the net mechanical energy and is it a loss or gain?
*November 23, 2009*

**physics**

Momentum is conserved whenever total mechanical energy is conserved. I believe this is false. Am I correct?
*November 23, 2009*

**physics**

Is this true or a trick question? In order to get a piano to start moving, you must push against it with a larger force than it pushes on you?
*November 23, 2009*

**physics**

A string is hanging from the rearview mirror of you car and a ball is at the end of this string. Suppose that you drive around a circular track at fixed speed. Which list below gives all the forces that act on the ball? A) tension and the force of gravity b) tension force of ...
*November 23, 2009*

**physics**

Is it true or false that when a baseball player hits a home room, the baseball received a greater impulse from the bat than the bat did from the ball?
*November 23, 2009*

**physics**

Is it true or false that momentum is conserved when total mechanical energy is conserved?
*November 23, 2009*

**physics**

please help--I don't understand how to get started! A small particle of mass 2.0 x 10^-19 kg is attached to a nanofiber of relaxed length 0.50 nm (Recall that 1.0 nm = 10^-9 m) . The nanofiber is attached to a substrate (an immovable wall). The plot is a graph of the force...
*November 23, 2009*

**physics**

A 2000 kg space probe is moving rightward in empty space along the x axis at 12 m/s. One of the probe’s rockets is fired providing a thrust of 1800j N along the y axis. The rocket fires for 1.5 s. How can I derive the equation for the trajectory of the probe during the ...
*November 23, 2009*

**physics**

An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction force-the net force on the object is zero, so the reaction force is zero ...
*November 23, 2009*

**math**

i need help like for you to show the work so i can figure it out i know how to replace the letters with the fractions but i dont know how to figure it out past there.
*November 22, 2009*

**math**

I need help how to figure out 2a-6c when a = -1/3 and c = 3/4
*November 22, 2009*

**Math**

Describe a situation where you would use the order of operations with money in your daily life.
*October 20, 2009*

**math**

x + y + z when x = -6.059; y= 3.884, z = 15.710 2. -19 -(-2.65)
*September 27, 2009*

**Physics**

A ball thrown straight upward returns to its original level in 2.30 . A second ball is thrown at an angle of 38.0 degrees above the horizontal. What is the initial speed of the second ball if it also returns to its original level in 2.30 ?
*September 27, 2009*

**Plants**

The closest relatives of the familiar pine and spruce trees are ________. elms, maples, aspens hornworts, liverworts, mosses gnetophytes, cycads, ginkgoes ferns, horsetails, lycophytes, club mosses
*September 22, 2009*

**Math**

ohhhhhhhhh I made it harder than it supposed to be....I see how to solve this now thank you
*September 9, 2009*

**Math**

1 hr =60mins 60 mins * 4=240mins+30mins = 270mins
*September 9, 2009*

**Math**

Multiply and simplify to hours and minutes 4 x (4 h 30 min)=
*September 9, 2009*

**college level Macroeconomics**

Here are my answers and i wanted to check if they were correct to the quiz posted below. 1.a because its a model for the ppf 2.b Just wha thappens when technology is completely ignored 3.a because the model is based off of inputs and outputs 4.c because savings greatly ...
*September 1, 2009*

**Macroeconomics**

Here are my answers and i wanted to check if they were correct to the quiz posted below. 1.a because its a model for the ppf 2.b Just wha thappens when technology is completely ignored 3.a because the model is based off of inputs and outputs 4.c because savings greatly ...
*September 1, 2009*

**Economics**

I was wanting to use answers to check my own, but here are my own answers 1.a because its a model for the ppf 2.b Just wha thappens when technology is completely ignored 3.a because the model is based off of inputs and outputs 4.c because savings greatly increases economic ...
*September 1, 2009*

**Economics**

1) The long run growth rate of the economy is consistent with: a.An outward expansion the economy's production possibilities frontier. b.A rightward shift in the aggregate demand curve. c.An inward expansion the economy's production possibilities frontier. d.An ...
*September 1, 2009*

**Trigonometric Functions**

A 2(pi) cm wire is stretched along a circle of radius 4cm. The degree measure of the central angle subtended by this wire arc is what?
*August 14, 2009*

**Grade 7**

I am doing a point form biogrpahy on John. A Macdonald. I need some facts about him or some sites where I can find sites about him Thanks:) Julia, CA
*June 30, 2009*

**8th grade**

Write a polynomial expression in simplest form that represents the difference between the area of the larger rectangle and the area of the smaller rectangle. Then find the difference when x=4.
*June 3, 2009*

**5th grade**

How does the suns energy travel?
*May 19, 2009*

**Chem**

It's BeCl2. It has the least difference in electronegativities between the two elements.
*April 12, 2009*

**chemistry**

Hey - just look up the Ka (or Kb respectively) values for each compound, and see which is bigger. Stronger acid = bigger Ka and that will dictate which direction it will go in. In this case, H3PO4 is the strongest acid (highest Ka) and therefore the direction of that reaction ...
*March 8, 2009*

**Algebra**

There has to be two equations. I got 1,200 for x...
*February 14, 2009*

**Algebra**

Chris takes out two loans. He borrows $800 more from a credit union that charges 12% interest than from a bank that charges 15% interest. If his interest payments total $420 annually, how much does he borrow at each rate?
*February 14, 2009*

**Algebra 1**

Ms. Buxx invested a total of $2000 in two saving accounts. The first account pays 3% intrest per year. The second accout pays 5% intrest per year. If the intrest form both accounts totals $84 dollars per year how much is invested in each account?
*February 14, 2009*

**Correction**

for 2nd question ( shown for Li2S) thnks
*January 24, 2009*

**Urgent Chem help.plz**

The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide crystal shown? Enter ...
*January 24, 2009*

**trigonometry**

2*cos^2(a/2)=(sin^2(a))/(1-cos(a)) can anyone help to prove this identity?
*December 8, 2008*

**physics**

Ok, so I know the different kinds of forces (applied, normal, gravity, parellel, and friction). And I know how to sub in other numbers for those forces ( for example, Parallel force is equal to mass times gravity times sine theta). I also know the "base" equation (a=...
*November 15, 2008*

**Science**

When an object exerts an action force on a more massive object, how does the reaction force compare to the action force?
*November 13, 2008*

**science**

The wind is powerful enough move any object on the surface. Think of it like erosion - it could take away sand and dirt, etc. and change the form permanently
*November 13, 2008*

**science**

What are the long term effects of tornadoes?
*November 9, 2008*

**Geo**

Identify two responsibilities that you think governments have with respect to population growth. Would that be like the food source, homes education etc???
*November 3, 2008*

**Geography**

Which parts of the world are experiencing a very high increase in population?
*November 3, 2008*

**Algebra**

I can not figure out how to solve this problem: "Two planes left the Chicago airport at the same time four hours ago. One is 40 miles per hour faster than the other one, and they are 6600 miles apart. What is the rate of each plane?" I am not the best at distance ...
*October 26, 2008*

**physics**

A car is driven 125km west and 65km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
*October 20, 2008*

**Physics**

Never-mind above that's a wrong approach
*October 19, 2008*

**Physics**

(950kg)(21.5)=(1300)(Vi van) Vi van = (950*21.5)/1300 Vi Van = 15.71 m/s ________________________ I don't know how to find the second part. Can someone answer this ? I was here looking for that answer myself.
*October 19, 2008*

**5th grade**

What is chromatography in relation to color and light?
*October 14, 2008*

**6th grade**

Not the definition in Physics- Social Studies, relating to natural resources and ecosystems
*October 8, 2008*

**6th grade**

I need a definition and examples of dynamic system- under natural resources, the teacher's definition is - a system that changes( kind of vague)
*October 8, 2008*

**Social studies**

First 5 books of the Bible? Genesis, Exodus,Leviticus,Numbers,Deuteronomy
*October 8, 2008*

**Expected Utility-Econ**

Suppose that your wealth is $250,000. You buy a $200,000 house and invest the remainder in a risk-free asset paying an annual interest rate of 6 percent. There is a probability of 0.001 that your house will burn to the ground and its value will be reduced to zero. With a log ...
*October 6, 2008*

**Chemistry**

At the equivalence point for CH3COOH, the pH will be?
*September 30, 2008*

**Finance**

A trader buys a European call option and sells a European put option. The options have the same underlying asset, strike price and maturity. Describe the trader's position. Under what circumstances does the price of the call equal the price of the put?
*September 14, 2008*

**geometry**

12a+45=90 -45=90 ---------- 12a=45 --- -- 12 12 a=45\12
*September 6, 2008*

**science**

Can you please tell me why the German Philosopher Nietzche went mad with closed universe theory.
*September 3, 2008*

**Math**

327,676
*August 28, 2008*

**english**

what is the question and answer flow for an exclamatory sentence?
*August 25, 2008*

**physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both boats reach the edge of a 4.8 m waterfall. The spy's speed is 16 m/s and the officials; speed is 26 m/s. ...
*July 6, 2008*

**Science**

I need to find out the adaptations of algae and seagrasses so they can survive in the coral reefs
*June 9, 2008*

**Science**

It's a trig problem, the classic right triangle with the Earth, Venus and Sol at the points. IF you know the distance to Venus (use radar and get it to the foot ... or the mm) AND you know the angle to the Sun AND you wait until the angle from us to Venus to the Sun is 90 ...
*June 9, 2008*

**french**

I am not amazing at french, but my translator says that it says: We went to the club. The Alibi was a club of dance and we listened to a variety of music. We danced with the music salsa, the rock'n'roll, and the hip-hop. We danced for two hours! The entrance fee was 12...
*May 19, 2008*

** Social Studies**

Thanks so much!!!
*May 19, 2008*

** Social Studies**

Which Songhai city was the center of learning,trade and religion
*May 19, 2008*

**science**

The moon passes across the sun
*May 19, 2008*

**math**

what would be the equation of a line that has a slope of -2 and passes through point (3,5)? Please help! Math test tomorrow:(
*May 5, 2008*

**math**

can you explain it a bit more.. i don't fully understand.
*May 3, 2008*

**math**

how do i graph a fraction? like say I had y=3/4x+1, how could I create plot points that are whole numbers? please help.
*May 3, 2008*

**math**

the answer to this is 6. 4+1=5-2=3+3=6
*April 20, 2008*

**Math**

how do you find the slope of the best fit line graph? And what is it supposed to tell us?
*March 18, 2008*

**Physics**

A man lifts a 21.1 kg bucket from a well and does 3.1 kJ of work. How deep is the well? Assume that the man lifts the bucket at constant speed. Answer in units of m. I am not sure if I did this right: (mg)(d)= Wnet (21.1 kg)(9.81)(d)= 3100J d= 14.98 meters
*March 2, 2008*

**science**

thanks
*February 28, 2008*

**science**

A _____________________ is an earthquake that occurs after a large earthquake in the same area
*February 28, 2008*

**science**

thanks
*February 28, 2008*

**science**

What is it called when an earthquake make mud?
*February 28, 2008*

**Physics**

Three point charges are arranged along the x axis: q1 = −4.43 nC at x1 = 199 mm, q2 = 2.33 nC at x2 = -302 mm, and a positive charge q3 at the origin. What is the value of q3 if the net force on this point charge has magnitude 4.50 µL?
*February 16, 2008*

**French**

hali ynhgfju8fmhs ufmjubhf lufnhgf uyghgyg uhyuhgjhg hjhjgjf ghuhjdhu hghjhjfjuhash julhyyufhygydgfhjhiufruhfgjghjhjhjhjh
*February 9, 2008*

**Social Studies**

I'm not here to give any useful information, but I do have a question to ask. are you doing GPS debating? :P
*February 2, 2008*

**English Lit**

How to interpret the poem, Lady of Shallot by Tennyson??
*January 22, 2008*

**physics**

what is the formula for finding the decrease in kenetic energy
*December 21, 2007*

**physics!! plz answer me!**

In a collision between two soccer balls, momentum is conserved. Is momentum conserved for each soccer ball? explian... plz =)
*December 10, 2007*

**physics!! plz answer me!**

A 0.15 kg baseball moving at +26 m/s is slowed to a stop by a catcher who exerts a constant force of -390 N. How long does it take this force to stop the ball? How far does the ball travel before stopping? plz plz plz help!!
*December 10, 2007*

**physics!!**

if u jump onto the floor, are you more likely to be hurt if your legs are relaxed or if your legs are stiff and your knees are locked? explain....plz help =)
*December 10, 2007*

**Greens Theorem**

Can someone show me step by step how to work this problem out please. Let C be the triangle with vertices (0,0), (1,0), and (1,2). Find the following line integral by two methods, directly and using greens theorem. 2xy^2dx + yx^2dy Thanks!!!
*December 10, 2007*

**Calculus 3**

ok so the final answer is 1/2 e^y^2????
*December 10, 2007*

**physics**

A 20 kg child on roller skates, initially at rest, rolls 4 m down an incline at an angle of 30 degrees with the horizontal. If there is no friction between incline and skates, what is the kenetic energy of the child at the bottom of the incline? (g= 9.81 m/s^2)
*December 5, 2007*

**science**

Any advice on how to figure out solubillty of Agno3?
*October 27, 2007*

**Ethics**

where can i get a big list and descirptions of scientists who were involved with scientific fraud? i tried google without much success...
*October 11, 2007*

**physics**

thank you so much!! it was so frustrating to get the wrong answer after wrong answer..
*October 10, 2007*

**physics**

i know how to do it, i keep getting the wrong answer!! a bob of mass 4.00 kg is suspended from a fixed point by a massless string of length 1.50 m. The bob moves in a horizontal circle with the string always making an angle theta=22 from the vertical. what is the speed of the ...
*October 10, 2007*

**physics**

a car is travelling along a cruve having radius of curvature of 80.0 m, banked at an angle of theta=30. The coeff of static friction of ice is 0.05. What is: a) the slowest speed the car can negotiate the banked curve with? b) what is the fastest speed? first of all, im having...
*October 9, 2007*

**Math**

her's my word problem: george is twelve years older than Jeannie. The sum of their ages in 5 years is 50. How odl is jeannie now?
*September 26, 2007*

**Physics**

I dont know
*September 21, 2007*

**physics**

You drop a stone from the top of a cliff that is 20 meters tall. Compute how long it will take for the stone to reach the bottom using various different choices for your coordinate system.
*September 7, 2007*

**math**

what is the radius of a circle using center and radius
*September 5, 2007*

**mat117**

Find all numbers for which the rational expression is not defined. 24/-8y
*June 26, 2007*

**physiology**

Why do the control mechanisms have several intergation centers? Julia, did you mean integration or interrogation? The control systems are not simple, they are multilayered, multistepped, and operate by releasing hormones, enzymes, and bioactive substances sequentially in time ...
*June 3, 2007*

**Math**

Why do we need to learn topography? Topographic maps show the hills and valleys. By learning to read a topographic map, you can tell whether a hill is really steep or has a very gradual grade. Check this site for more information. http://erg.usgs.gov/isb/pubs/booklets/symbols/
*May 24, 2007*

**Math**

I need to know for a project I am doing in math right now, where I can find the reason in life why we learn about Networking/Topograph. I've looked up definitions and the people who invented equations for it but we need to answer why we learn it in school Electrical ...
*May 23, 2007*

**english**

unscrabble words giuthlns rignps http://www.ssynth.co.uk/~gay/anagram.html http://wordsmith.org/anagram/ http://www.unscramble.net
*April 30, 2007*