# Posts by Megan

Total # Posts: 1,169

**Physics- Elena please help!**

(b)What was the speed of the bullet at impact with the block?

*October 18, 2012*

**Physics- Elena please help!**

A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet block system compresses the spring by a ...

*October 18, 2012*

**Physics- PLEASE HELP**

A 58.0 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with(b) If the ball is in contact with the players head for 19 ms, what is the average acceleration of the ball? a speed of 26.0 m/s. If the player was moving upward with...

*October 17, 2012*

**Physics**

Ann, a 66.1 kg person throws a 0.0460 kg snowball forward with a ground speed of 31.7 m/s. Billy, with a mass of 60.5 kg, catches the snowball. Both people are on skates. Ann is initially moving forward with a speed of 2.29 m/s, and Billy is initially at rest. After the ...

*October 17, 2012*

**Physics**

A man claims he can safely hold on to a 12.80 kg child in a head-on collision with a relative speed of 133. mi/h lasting for 0.100 s as long as he has his seat belt on. (a) Find the magnitude of the average force needed to hold onto the child.

*October 17, 2012*

**Physics URGENT!!!**

Thank you!

*October 17, 2012*

**Physics URGENT!!!**

Can you give me the values so I can compare, I don't think I am getting the right values!

*October 17, 2012*

**Physics URGENT!!!**

A 75.0 kg fullback running east with a speed of 6.00 m/s is tackled by a 82.0 kg opponent running north with a speed of 5.00 m/s. (a) Calculate the velocity of the players immediately after the tackle. (b)Calculate the direction of the players immediately after the tackle.(c)...

*October 17, 2012*

**Physics- Elena please help!**

A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet block system compresses the spring by a ...

*October 16, 2012*

**Physics HELP!**

A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet block system compresses the spring by a ...

*October 16, 2012*

**Math. test tomorrow. help!**

In 1960, the population was 291000. In 1970, the population was 480000. Assuming exponential growth, what is the annual percent rate? and doubling time? The answers are 5.13% and 14 years. I do not know how to get this though :( Please help!

*October 14, 2012*

**please help. Test tomorrow**

thanks:)

*October 14, 2012*

**Math. Increases**

Please help! test tomorrow

*October 14, 2012*

**Math. Increases**

In 1960, the population was 291000. In 1970, the population was 480000. Assuming exponential growth, what is the annual percent rate? and doubling time? The answers are 5.13% and 14 years. I do not know how to get this though :( Please help!

*October 14, 2012*

**Statistics**

500

*October 14, 2012*

**Math**

On his 13th birthday he was 112 cm tall and on his 14th birthday he was 121cm tall. Assume a geometric monthly growth rate. What is this rate? (%)

*October 13, 2012*

**statistics - probability**

Get a study group. loser

*October 12, 2012*

**Algebra**

Nevermind...Already got an answer!

*October 9, 2012*

**Algebra**

A natural food store makes its own brand of trail mix out of dried apples, raisins, and peanuts. One pound of the mixture costs 3.18. It contains twice as much peanuts by weight as apples. One pound of dried apples cost $4.48, a pound of raisins costs $2.40, and a pound of ...

*October 9, 2012*

**Chemistry**

Write a net ionic equation for the reaction that occurs when aqueous solutions of potassium hydroxide and nitrous acid are combined.

*October 8, 2012*

**Chemistry**

Write a net ionic equation for the reaction that occurs when aqueous solutions of hydroiodic acid and barium hydroxide are combined.

*October 8, 2012*

**Physics**

A boater wants to head straight across a river that has a current of 3km/hr. If the top speed of the boat in still water is 4km/hr, find the direction the boat must travel into the current to go straight across the river. How fast is the boat going straight across the river?

*October 6, 2012*

**Physics URGENT!!!**

Can you give me the values you got so I can compare my answers to make sure I did this right?

*October 5, 2012*

**Physics URGENT!!!**

A sled loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 40.0o above the horizontal. The sledge moves a distance of 16.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.510...

*October 5, 2012*

**Chemistry**

What can be concluded about Volume in milliliters per celsius, and volume in milliliters per kelvin?

*October 4, 2012*

**Physics- Elena please help!**

Two blocks each of mass 3.38 kg are fastened to the top of an elevator as in the figure. (b) If the strings can withstand a maximum tension of 87.8 N, what maximum acceleration can the elevator have before the first string breaks?

*October 3, 2012*

**Science**

Calculate the molarity of a solution formed using 55.4 g of AgNO3 in enough water to form 250 ml of solution.

*October 1, 2012*

**physics**

A woman with a mass of 41 kg runs at a speed of 7 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?

*September 26, 2012*

**math**

A rectangle is 4 inches longer than it is wide and has an area of 165 square inches. Find its dimensions

*September 25, 2012*

**physics**

if an egg is thrown at an initial height of 1.9m and lands 2.09s later at 19m what is the velocity at which the egg was thrown and the velocity with which it lands

*September 24, 2012*

**history**

im still on the introduction paragraph i can work on the 3 body paragraphs i just need the intorduction so i can move forward

*September 23, 2012*

**history**

I need help doing my introduction paragraph for my essay Describe the effects of the growth of Protestantism, and its development on: a)Settlement patterns in america b)the development of early american society c) the development of early American politics/government

*September 23, 2012*

**History**

what could the thesis be that's what im stuck

*September 23, 2012*

**History**

i need help starting it. its a essay prompt

*September 23, 2012*

**History**

Examine the three themes of the renaissance (humanism. the critical spirit and empiricism). In what ways are these themes reflected in the development of american society between 1660 and 1750?

*September 23, 2012*

**grade six math**

7933333.00

*September 13, 2012*

**Physics**

a steel ball drops onto a thick steel plate. its speed just before it hits is 10 m/s and it rebounds with a speed of 9 m/s. what percentage of its kinetic energy did it lose during the collision? what would you expect its speed to be after the second rebound?

*September 6, 2012*

**math**

Is the the value of the 4 4,000?

*September 5, 2012*

**Chemistry**

What is the density of a copper block that is 8.96g/cm^3 in ounces/pint? I did all the conversions and the answer I got was 150ounces/pint? Is this correct? How to I solve this problem?

*September 4, 2012*

**Math**

Ayeshe was given 3 clues concerning the value of a mystery fraction. The clues she was given are shown below. 1) I am a fraction between 1/5 and 1/4 2) My numerator is a prime number less than 10. 3) My denominator is 10 more then my numerator. What is the mystery fraction? ...

*September 4, 2012*

**physics**

This is the question to one of my physic problem. A person standing outside their house is passed by a runner heading West at a steady pace of 3.3 m/s. Right when the runner passes by, the person accelerates towards the south at a rate of 0.36 m/s2 for 1.2 seconds. Determine ...

*August 30, 2012*

**physics**

This is the question to one of my physic problem. A person standing outside their house is passed by a runner heading West at a steady pace of 3.3 m/s. Right when the runner passes by, the person accelerates towards the south at a rate of 0.36 m/s2 for 1.2 seconds. Determine ...

*August 30, 2012*

**math**

so i got a math work sheet and i cannot figure out the math puzzle and to get the answer you have to do the work but i need help. Does anyone know what the answer to what did the spanish farmer say to his chicken is?

*August 21, 2012*

**Social Studies**

Near what type of physical feature was most of the earliest farming villages built?

*August 20, 2012*

**health**

Me toooooo lol

*August 11, 2012*

**consumer math**

The Mannings file a tax return showing $125000 in earned income, $3288 from interest income, and they have a tax credit of 1% of their earned income. They claim 5 exemptions of $2500 each, one head of household exemption of $10500, pre-tax medical deductions of $125 weekly, ...

*August 9, 2012*

**chemistry**

You are given 50 mL of .25 M citric acid. How many moles of NaOH would you need to add to obtain a soln with a pH of 6.7? Assume volume unchanged Ka1=7.4E-4 Ka2=1.7E-5 Ka3=4E-7

*July 26, 2012*

**Chemistry**

work out the [OH-], [H+] and pH of the solution formed when 0.500L of 0.250 M hydrochloric acid solution is mixed with 0.500 L of a 0.250 M calcium hydroxide solution.

*July 22, 2012*

**Physics**

A 20 N force acts on a 10 kg object parallel to the object's displacement. If the force acts for 32 m, what is the final kinetic energy, in J, of the object assuming it starts from rest?

*July 2, 2012*

**Physics**

The work done on an object by the gravitational force is 28 J. What is the change in the gravitational potential energy of the object?

*July 2, 2012*

**Physics**

From your intergalactic survey base, you observe a moon in a circular orbit about a faraway planet. You know the distance to the planet/moon system, and you determine the maximum angle of separation between the two and the period of the moon's orbit. Assuming that the moon...

*June 10, 2012*

**Physics HELP!**

An ant and a beetle are riding a spinning record on a record player. The ant stands on the outside edge of the record while the beetle stands on the record's label. The ant is four times as far from the center of rotation as the beetle. What is the ratio of the ant's ...

*June 3, 2012*

**Physics help?**

Nitrogen gas molecules, which have mass 4.65×10−26 kg, are striking a vertical container wall at a horizontal velocity of positive 440 m/s. 5.00×1021 molecules strike the wall each second. Assume the collisions are perfectly elastic, so each particle rebounds...

*June 2, 2012*

**Physics**

Sam tosses a ball horizontally off a footbridge at 4.3 m/s. How much time passes after he releases it until its speed doubles? Can someone please explain the correct equation to use thoroughly and help me to find the correct answer?!

*May 25, 2012*

**Chemistry**

Enthalpy changes: H2O2(l) ----> H2O(l) + 1/2P2(g) delta H= -94.6kJ H2(g) + 1/2O2(g)----> H2O2 delta H= -286.0kJ Calculate the value on delta H for the reaction: H2(g) + H2O2(l)----> 2H2O(l)

*May 19, 2012*

**math**

N =197

*May 18, 2012*

**physics**

you take 250.0 g of ice from the refrigerator at -8.00 degrees celsius. how much heat does it take to warm it to room temperature, 20.0 degrees celsius?

*May 13, 2012*

**11TH Geometry**

With the image of O(-2,-1) after 2 reflections. one across the line y=-5 and line x=1

*May 12, 2012*

**Chemistry**

2Na+F2=2NaF if 20.0 g of sodium is used what mass of sodium fluoride could be produced assuming that fluorine gas is unlimited

*May 1, 2012*

**chemistry**

2C2H6+702=4CO2+6H20 how many grams of oxygen are required to completely burn60.0g ethane (C2H6) show work Using the above equation how many Lof 02 are required to burn 20.0Lof ethane thank u soo much this is for a test

*May 1, 2012*

**chemistry**

Mg(ClO32=MgCl2+3O2 12.omolMg(ClO3)2produces molMgCl2and MolO2 3.00 molofMg(ClO3)2produces what mass of O2

*May 1, 2012*

**ALGEBRA**

first off, I like to circle to common ones... so I first circle the two x's. Since we are subtracting, it would be x-x which is 0. Thenm i circled the 2y's. It would be 2y - (-2Y) aka 2y +2y which is 4y. Then, -2z-2z which is -4z. it would be 0+4y-4z and you obviously ...

*April 25, 2012*

**chemistry**

How many moles of ions are contained in 1.4 L of a 1.6 M solution of Mg(NO3)2?

*April 24, 2012*

**chemistry**

How many moles of ions (cations and anions) are contained in 1.2 L of a 1.9 M solution of KCl? KCl K+ + Cl-)

*April 24, 2012*

**chemistry**

What is the molarity of each kind of ion in a solution of magnesium chloride that contains 29.0 g of magnesium chloride dissolved in enough water to make 1.73 L of solution? MgCl2 Mg2+ + 2 Cl-

*April 24, 2012*

**ap chemistry**

A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr 3+ and a gold electrode in a solution that is 1.0 M in Au 3+ . a) Provide the half cell reactions for each of the electrodes. b) Which is the anode and which is the cathode? How did you decide? c) Give an ...

*April 17, 2012*

**Geometry**

Find the center of the circle using the equation provided. Please show work! x^2 + y^2 = 16

*April 9, 2012*

**geometry**

Give an example of an infinite set.

*April 9, 2012*

**physics**

Elena, for some reason I'm getting an answer of -3 (8.00 x 10^-12) x (d-x)^2 = (6.00 x 10^-12) x (x^2) (d-x)^2/x^2 = 7.5 x 10^-1 (d-x)(d-x)/x^2 = 7.50 x 10^-1 x^2-x+0.25/x^2= 7.50 x 10^-1 then I get x = -3 Can you help! I'm not sure where i am going wrong.

*April 5, 2012*

**physics**

Two spheres with charges of 4.00nC and 3.00nC are placed 0.500m apart. At what point between the two charges must the third charge of 2.00cN be placed so that the net electrostatic force acting on this charge is zero?

*April 5, 2012*

**Precalc**

Evaluate Tan[(3pi-70000pi)/2]

*March 28, 2012*

**BioChem**

Write the chemical equation for the reaction that occurs when you add NaOH solution to NaH2PO4/Na2HPO4 buffer solution

*March 23, 2012*

**chemistry**

Hydorgen peroxide may be prepared by the following reactions: 2NH4HSO4 ---> H2+(NH4)2S2O8 (NH4)2S2O8+2H2O ----> 2NH4HSo4+H2O2 What mass of ammonium hydrogen sulfate, Nh4HSo4 is initially required to prepare 2.00 mole of H2O2? What mass of H2O is required? I have checked ...

*March 22, 2012*

**Chemistry**

What is the equilibrium equations that result when solid NH4F is dissolved in sufficient water to produce 5.0 mL of 0.5M NH4F solution? How would the addition of 5 drops of 0.1M HCl affect the equilibrium system. Give an explanation. How would the addition of 5 drops of NaOH ...

*March 20, 2012*

**math**

at camp, miriam learned how to use a pottery wheel. she can make 3 bowls in 2 hours. how long will it take her to make a set of 12 bowls?

*March 7, 2012*

**Math**

15/8-9/4=1 1/2

*March 6, 2012*

**College Algebra**

Let U = {8, 9, 10, 11, 12, 13, 14}, A = {8, 9, 10, 11}, B = {8, 9, 12, 13}, and C = {10, 12, 14}. List all the members of the given set. (Enter your answers as a comma-separated list.) (A ∪ B) ∩ C

*March 6, 2012*

**Physics**

1.96 s

*March 4, 2012*

**understanding hospital billing and cosing**

Coding.

*March 3, 2012*

**Algebra 2**

A bag contains five red marbles and three blue marbles. In how many different ways can two red marbles be drawn if the first marble is not returned to the bag before the second marble is drawn?

*February 28, 2012*

**Algebra 2**

In how many different ways can six people be seated in a six-passenger van?

*February 28, 2012*

**Algebra 2**

The nurseryman brought six different varieties of trees to plant in six locations in the park. In how many different ways can he plant the trees?

*February 28, 2012*

**Algebra 2**

The artist, R. Locklen Jones, selects three paintings from a collection of six to display in a row. How many different arrangements of the display are possible?

*February 28, 2012*

**Algebra 2**

The red spinner has six equal sectors labeled with numbers 1 through 6. The blue spinner has four equal sectors labeled with letters A, B, C, and D. Find the probability of spinning the two spinners and getting a 5 with a B?

*February 28, 2012*

**Algebra 2**

A box contains 4 blue golf tees, 2 red ones, 1 yellow tee, and 3 white ones. Two tees are randomly drawn from the box. Find the probability of choosing a blue tee followed by a red one, if the first tee chosen is returned to the box before choosing the second tee?

*February 28, 2012*

**Algebra 2**

Two cards are randomly drawn from a standard deck without replacing the card after the first draw. Find the probability of drawing a spade followed by a heart?

*February 28, 2012*

**Algebra 2**

The numbers 1 through 9 are written on slips of paper and placed into a hat. Two slips are randomly drawn. If the first slip of paper is not returned to the hat after it is drawn, find the probability of getting a six and then a three?

*February 28, 2012*

**math**

what does z equal in the equation 3z minus z equals 24

*February 25, 2012*

**Physics 2**

A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?

*February 25, 2012*

**Physics 2**

A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?

*February 25, 2012*

**Geometry Are these two triangles similar? Thanks!**

Thank you :]

*February 20, 2012*

**Geometry Are these two triangles similar? Thanks!**

Are these two triangles similar? How do you know? There are two triangles HMG and JMK They are connected at the top point at M H is on the bottom left, G is on the bottom right, and M is at the top for triangle HMG For triangle JMK J is on the bottom right and K is on the ...

*February 20, 2012*

**6th grade Social studies**

What was the main effect of the repeated exiles of the Jews?

*February 18, 2012*

**Math**

Find two numbers on the 30-board(the factor game) with the greatest product.

*February 16, 2012*

**Chemistry**

Determine the grams of hexane that will react exactly with 22 g of oxygen. Show all working please. Thank you.

*February 12, 2012*

**Chemistry**

Calculate the moles of hexane required to form 150 g of carbon dioxide. Please show all working. Thank you.

*February 12, 2012*

**Africa**

Why did Greg mortenson start pennies for peace

*February 9, 2012*

**literature.......**

Yes i like it. Its really good. Im supposed to make a realistic fiction story too and i want to do it by myself with a little help. i love writing but not this genre i like making stuff up! Good luck. :)

*February 5, 2012*

**Geometry**

Find the area of a rhombus with a 45 degree angle and sides of 12m long?

*February 1, 2012*

**math**

what three consecutive months would have the least number of days

*January 31, 2012*