Saturday

February 25, 2017
Total # Posts: 1,519

**physics conservation of momentum**

A 0.5 kg ball is thrown horizontally towards a wall with a speed of 10 m/s. The initial velocity is chosen to be the positive x-direction for this question. The ball horizontally rebounds back from the wall with a speed of 10 m/s in the negative x-direction. What is momentum ...

*November 8, 2008*

**Physics**

how come for part a. when i solve for Vf (which becomes V0 of the projectile motion), i get a negative value.. since i got this equation... 1/2ks^2+mgh+1/2mv^2 = 0 solving for v.. i get v = sqrt(-(2gh-ks^2/m) thats what is confusing me. so im not shure if i did it correctly.

*November 7, 2008*

**Physics**

A child's game consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. By compressing the spring, the child can launch the ball up the ramp. The spring has a spring constant k, the ball has a mass m, ...

*November 7, 2008*

**physics**

a spring with spring constant k= 100N/m is at its equilibrium length a) how much elastic potential energy is stored in the spring? b) the same spring is stretched so that it is 6cm longer than it was. How much elastic potential energy is stored in the spring now? c) a ...

*October 30, 2008*

**French**

I have to write a short paragraph about where I have already traveled. Can someone check this for me? J’ai déjà allé à d’autres états des Etats-Unis et le Mexique. J’ai allé au Californie, l’Utah, Le Colorado, L&#...

*October 27, 2008*

**Science**

Explain what happens in the eye of the storm. Why can you survive the eye of the storm if you are inside and have shelter but instantaneously freeze if you are outside?

*October 23, 2008*

**Chemistry!!!**

Why does the ionization energy of Ca+ greataer than K even tho they have the same amount of e- why does Na have a relatively simple atomic spectrum while Cr has a very complex one?

*October 22, 2008*

**Chemistry**

Why do bromine and iodide have similar chemical properties?

*October 22, 2008*

**english**

In the following passage, a linking device has been omitted. Choose the word that would make the passage coherent: __ this technique won’t work for everyone, it helps many people get a good cache of ideas to draw on. 1. However 2. Although Please help with the question I ...

*October 19, 2008*

**english**

Rewrite this sentence into the active voice by filling in the blank: ORIGINAL: The agency conducted an investigation into the matter. REVISED: The agency __________ the matter. ORIGINAL: Attempts by economists at defining full employment have met with failure. REVISED: ...

*October 19, 2008*

**english**

Rewrite this sentence into the active voice by filling in the blank: ORIGINAL: The agency conducted an investigation into the matter. REVISED: The agency __________ the matter. ORIGINAL: Attempts by economists at defining full employment have met with failure. REVISED: ...

*October 19, 2008*

**12th calculus**

find dy/dx by implicit differentation and evaluate the derivitave at the given point: (x+y)^3:x^3+y^3 point=(-1,1)

*October 16, 2008*

**ict**

which data type would you use for a telephone number

*October 16, 2008*

**Physics**

Suppose you press a book against the wall with your hand. The book is not moving and you are pushing horizontally. Now suppose you decrease your push, but not enough for the book to slip. What happens to each of the following forces? DO they increase in magnitude, decrease, or...

*October 16, 2008*

**math**

pls..help me about this common monomial factor. how to solve it,and how can i use the short method. thank you. :)

*October 14, 2008*

**9th grade**

how do i solve this equation with variables on both sides-the sequel 3(5y=2)-y=2(y-3)

*October 13, 2008*

**Social Studies**

I need help with my homework........... this is the question........... Are monsoons a blessing or a curse for the subcontinent?

*October 7, 2008*

**Chemistry/physics**

The question is calculate the average kinetic energy of CH4 molecules in a sample of CH4 gas at 263K. What formula should i use when you say "use temp"

*October 5, 2008*

**Chemistry/physics**

instead of what?

*October 5, 2008*

**Chemistry/physics**

Are there two ways of calculating the average kinetic energy of a molecule? Ik that 1/2mv^2 works but for this problem, i don't know the mass or the velocity....

*October 5, 2008*

**World History**

Thank You!

*October 5, 2008*

**World History**

haha, that's fine one more question.. the king didn't follow the magna carta but the people did right? and then that led to the creation of the Bill of right so who created the Bill of rights?

*October 5, 2008*

**World History**

Thank you so much that was exactly what I was looking for :]

*October 5, 2008*

**World History**

How did the Magna Carta and the Bill of rights lead to a change in goverment.

*October 5, 2008*

**Chem/Physics**

Are there two ways of calculating the average kinetic energy of a molecule? Ik that 1/2mv^2 works but for this problem, i don't know the mass or the velocity....

*October 5, 2008*

**Spelling**

k thnx guys! =)

*October 2, 2008*

**Spelling**

deck is to ornaments as a. equip is to pharaphernalia b. furnish is to references c. safeguard is to valuables d. salvage s to remains e. pack is to belongings

*October 2, 2008*

**Integrated Algebra**

How to solve common monomial factor? like this ex: 1.) x2y+x2y2=x2y 2.) 2a+2b 3.) 3b-9b2-12a

*September 30, 2008*

**Social Studies**

How does attending school benefit both the student and the government?

*September 29, 2008*

**social stuidies**

Maybe because they aren't patient enough to deal with children and the responsibility they have to take on .....or they wait till they become more matured an are then ready to take time to make their child or children.

*September 29, 2008*

**Basic Calculus**

How do you graph f(x)=sqrt(a^2-x^2)? how do you graph f(x)=0, if x is rational and f(x)=1, if x is irrational? I need to know how to graph them by hand, not on a calculator. Thanks in advance.

*September 13, 2008*

**MATH PLEASE HELP!**

Solve each system 3x+2y= -2 9x- y= -6 I know how to solve for x but i get really lost trying to figure out how to solve for the second variable

*September 11, 2008*

**Algebra 2**

Solve each system 3x+2y= -2 9x- y= -6 I know how to solve for x but i get really lost trying to figure out how to solve for the second variable

*September 11, 2008*

**english**

apples books

*September 3, 2008*

**home economics**

what foods have calcium in them ?

*August 29, 2008*

**honors geometry**

the locations of the participating towns on the map are Curtis(0,0), Clearfield(10,2,), Buster(5,7), Angel City(1,4) which of the following planned routes is nearest to the 26.3 mile requirement? a> curtis to clearfield to angel city to curtis b>curtis ti clearfield to ...

*August 24, 2008*

**math**

for function operations: If f(x) = x^2 -4 and g(x) = [square root of] (2x+4) g(f(a+2)) ---> then x^2 - 4 +2 x^2 - x [square root of] (2(x^2 - 2) +4) = x [square root of] 2 wher does 'a' come from?, but is that right?

*August 23, 2008*

**math**

i'm looking at another one, and i don't know where to start: x^3 - 2x^2 - 4x +8 hmm, cause u can't pull and x out, no quadratic . . .???

*August 23, 2008*

**math**

I'm not exactly sure how to factor cubed roots: 8x^3 - 1 = (2x)^3 - 1 that's what i get; can it be simplified anymore?

*August 23, 2008*

**math**

I need help what units are used when talking about area?

*August 7, 2008*

**Mat 116**

In 1990, the life expectancy of males in a certain country was 64.7 years. In 1994, it was 68.4 years. Let E represent the life expectancy in year t and let t represent the number of years since 1990. The linear function E(t) that fits the data is E(t)= ___t + ____ (round to ...

*August 2, 2008*

**English**

I am doing well in my class but having trouble with a particular assignment. I don't really understand bias, fallicies and rhetoric. Here is my assignment, any help or enlightenment would be appreciated. I am not asking for my assignment to be done for me, I am just having...

*July 27, 2008*

**English**

I am doing well in my class but having trouble with a particular assignment. I don't really understand bias, fallicies and rhetoric. Here is my assignment, any help or enlightenment would be appreciated. I am not asking for my assignment to be done for me, I am just having...

*July 27, 2008*

**MATH HELP!**

Help with any of these would be greatly appreciated! THANK YOU! 2. How would i determine the values of 'k' if the graph y=2x^2-2x+3k intersects the x-axis at two distinct points? 3. The path of a basketball can be modeled by the equation h(d)=-0.13d^2+d+2. where h(d) ...

*July 24, 2008*

**Math help**

Help with any of these would be greatly appreciated! THANK YOU! 1. How would i solve 3x^2 - 4 = 0? And in simplest radical form? 2. How would i determine the values of 'k' if the graph y=2x^2-2x+3k intersects the x-axis at two distinct points? 3. The path of a ...

*July 23, 2008*

**Math help**

That dosen`t solve the whole question though =(.

*July 23, 2008*

**Math help**

How would i solve 3x^2 - 4 = 0? And in simplest radical form?

*July 23, 2008*

**Help with Math**

How would i determine the values of 'k' if the graph y=2x^2-2x+3k intersects the x-axis at two distinct points?

*July 22, 2008*

**Help with Math**

The path of a basketball can be modeled by the equation h(d)=-0.13d^2+d+2. where h(d) is the height in meters or the basketball and d is the horizontal distance in meters from the player. How far does the ball travel horizontally before hitting the floor?

*July 22, 2008*

**Function**

How would i solve x^3-3x^2+2=0? How would i show it in exact values?

*July 22, 2008*

**Functions / Calculus**

One of the zeros if P(x)=6^3-13^2+x+k is 2. What would be the value of k? And how would i write P(x) in factored form?

*July 22, 2008*

**calculus**

What would the remainder be if: P (x) = x^3 - 3x^2 + 3x + 2 is divided by x + 1? How would i get the answer?

*July 22, 2008*

**English**

Oh I am sorry the point of this letter is to show that you can write persuasive letter Mark Jones is the Head of Disablity benefits in your localDisablity office. You have a court hearring date in three months to determine if you are entilted to get any benefits however you ...

*June 17, 2008*

**English**

Please check this for me thanks so much for your time :) Write a letter To Mark Jones regardng your finanical hardships you are facing since you have been out of work due to a car accident. Make sure you give as many details as you can. June 17, 2008 Dear Mr. Jones I am ...

*June 17, 2008*

**calcius**

Determine whether the relation represents a function. If it is a function, state the domain and range. {(-2, 1), (-1, -2), (0, -3), (1, -2), (3, 6)} a. function domain: {-2, -1, 0, 1, 3} range: {1, -2, -3, 6} b. function domain: {1, -2, -3, 6} range: {-2, -1, 0, 1, 3} c. not a...

*June 9, 2008*

**calcius**

Determine whether the function is linear, constant, or neither y = x3 - x2 + 8 a. Linear b. Constant c. Neither I think it is neither

*June 9, 2008*

**english**

hi Im a senior and my last assignment in english is to write an essay ,If i don't get at least a B on this essay .I wont graduate.... The question : "why do writers often chose "betrayal" as a theme? to prove it chose 2 books ( kite runner and 1984) even if ...

*May 21, 2008*

**Corporate Tax**

Alan just immigrated to Canada and owns STARS ltd (US company). Alan owned 100% of shares to STARS ltd. STARS ltd. was incorporated in the US in 2004. Alan wanted to know if he should use STARS ltd or a new company to carry on his business in Canada? He's also not sure ...

*May 18, 2008*

**chemistry**

what is the balanced chemical equation for aqueous hydrgoen peroxide to produce solid lead (II) sulfate and liquid water?

*May 7, 2008*

**Physical Science**

Thank you Kristi, I really appreciate your response.

*April 28, 2008*

**Physical Science**

Why don't oil and water mix?

*April 28, 2008*

**Physical Science**

Many dry cereals are fortified with iron, how would you prove that?

*April 28, 2008*

**Physical Science**

An acid and a bas react to form a salt which consists of positive and negetive ions. Which forms the positive ions the acid or the bas?Which forms the negetive ions?

*April 28, 2008*

**Physical Science**

Pour vinegar onto beach sand in the Carribian and the results is a lot of froth and bubbles. Pour vinegar onto beach sand from California and nothing happens. Wht?

*April 28, 2008*

**Physical Science**

How do you know I have done no work? Maybe I am checking my results or maybe I just need to see how you get the results you get, I did not want to over write with everything I came up with so I just post the questions, sorry it will not happen again.

*April 28, 2008*

**Physical Science**

What happens to the pH of soda as it loses it's carbonation? Would it effect the taste? Why or why not?

*April 28, 2008*

**Physical Science**

How might warmer oceans accelerate global warming?

*April 28, 2008*

**Physical Science**

What determines whether a material is transparent or opaque?

*April 18, 2008*

**Physical Science**

What do radio wave and light have in commen? What is different about them?

*April 18, 2008*

**Physical Science**

What prevents rainbows from being seen as complete circles?

*April 18, 2008*

**Physical Science**

In which of these cases does a ripe banana apear black, red light/green light or blue light? Why?

*April 18, 2008*

**world history**

who sparked the 30 year's war?

*April 15, 2008*

**English (Frankenstein essay)**

i'm writing the same essay basically and this really helped cos i have no idea what frankenstein is on about tbh, thanks! :)

*April 10, 2008*

**Physical Science**

What kind of motion should you impact to the nozzle of a garden hose so that the resulting stream of water approximates a sine curve?

*April 5, 2008*

**Physical Science**

How does a Doppler effect aid police in detecting speeding motorist?

*April 5, 2008*

**Physical Science**

At the stand of a racetrack you notice smoke from the starters gun before you hear it fire Explain.

*April 5, 2008*

**Physical Science**

Why is an echo weaker than the original sound?

*April 5, 2008*

**Physical Science**

If we double the frequency of a vibrating object what happens to its period?

*April 5, 2008*

**Geometry**

The image of P(-1, 5) under a translation is P'(5, 7). What is the preimage of P? Could someone show me steps on how to do this problem, and the answer please? Thank you.

*April 5, 2008*

**Pysical science**

What is the net magnetic force on a compass needle?

*March 31, 2008*

**math**

How do I complete the square for a quadratic equation? I'm not sure how to do it.

*March 25, 2008*

**math**

Am I foiling this right? The problem is (x-5)^2 and I got x^2-10x-10. Is that right?

*March 24, 2008*

**Biology**

Can someone please help me ! i don't know how to read a gel electrophoresis. thank you

*March 23, 2008*

**Physical Science**

A friend tell you that a refrigerator door beneath it's layer of white painted plastic, is made of aluminum. How could you check to see if this is true withoutscraping away the plastic?

*March 22, 2008*

**Physical Science**

I still don't get it.

*March 16, 2008*

**Physical Science**

When a car is moved into a painting chamber, a mist of paint is sprayed around it. When the body of the car is given a sudden electric charge and the mist of the paint is attracted to it, prsto the car is quickly and uniformly painted. What does the phenomenon of polorization ...

*March 16, 2008*

**Physical Science**

Why does a magnet attract an ordinary nail or paper clip but not a wooden pencil?

*March 16, 2008*

**Physical Science**

What is the net magnetic force on a compass needle? By what mechanism does a compass needle line up with a magnetic feild?

*March 16, 2008*

**Physical Science**

If every iron atom is a tiny magnet why aren't all iron materials themselves magnets?

*March 16, 2008*

**Physical science**

Your right sorry, it is watt-sec.

*March 16, 2008*

**Physical science**

What unit is represented by a. joule/coulomb b. coulomb/second c. watt/second

*March 16, 2008*

**Physical Science**

There are three ways to cook popcorn, list them and relate hoe cooking popcorn is really an example of three ways heat can be tranferred.

*March 10, 2008*

**Physical Science**

What is the purpose of the layer of copper or aluminum on the bottom of a piece of stainless steel cookware?

*March 10, 2008*

**Physical Science**

Thank you drwls, you are a lifsaver!!

*March 10, 2008*

**Physical Science**

Turn an incandescent lamp on and off quickly while you are standing near it. You feel it's heat, but you find when you touch the bulb that it is not hot. Explain why you felt the heat from the lamp?

*March 10, 2008*

**Physical Science**

The heat of volcanoes and hot springs comes from trace amounts of radioactive minerals found in the Earth's interior. Why isn't the same rock at the Earth's surface warm?

*March 10, 2008*

**Physical Science**

In your room are things such as tables, chairs and other people. Which of these things has a temperature lower than air? Greater than air? And equal to the temperature of air?

*March 1, 2008*

**Physical Science**

After a car is driven for some distance, why does the air pressure in the tires increase?

*March 1, 2008*

**Physical Science**

On which temerature scale does the average kenetic energy of molecules double when the temperature double?

*February 27, 2008*

**Physical Science**

A 0.6-g peanut is burned beneath 50 g of water, which increases in temperature from 22degreesC to 50 degreesc. What is the exact food value of the peanut? (Assuming a 40% efficiency)

*February 27, 2008*