Monday

September 1, 2014

September 1, 2014

Total # Posts: 917

**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*

**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*

**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*

**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*

**consumer math**

did you ever figure this out? what was the answer?
*January 30, 2012*

**Alegbra**

Six angles in a hexagon are fit together.It looks like this... _____ /\ / \ /_1\6/_5\ \ 2/3\4/ \/____/ I try to draw the picture as best as I can but try to imagine. It's a hexagon with the six angles labeled near the center of the hexagon. The options given to this ...
*January 30, 2012*

**math**

A statue is made of a mixture of copper and zinc in a ratio of 11:4 (copper to zinc). If the weight of the statue is 3165 pounds, what is the weight of the copper?
*January 29, 2012*

**math**

The perimeter of the triangle is 40 inches. If you wanted to construct a similar triangle with a perimeter of 50 inches, what would be the length of the shortest side of the triangle?
*January 29, 2012*

**Math**

• 1 mile=5280 feet • 1 foot=12 inches • 5280 X 12 = 63,360 inches in 1 mile • 400 x 63,360 = 25,344,000 inches in 400 miles (this is how many inches SLC and Reno are apart today. • 250 x 63,360 = 15,840,000 inches in 250 miles (this is how many inches ...
*January 27, 2012*

**algebra**

y=1/2x-1
*January 27, 2012*

**Physics**

In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.71 x 105 N/C during the first 5.49 cm of the tube's length; then they move at essentially constant velocity another 47.9 cm before hitting the screen. Find the ...
*January 25, 2012*

**chemistry**

Calculate the number of moles in 35.7 grams of Na3PO3
*January 21, 2012*

**Calculus**

What exactly is an integral? I understand it is the area under a curve but what does it pertain to?
*January 17, 2012*

**Math**

How do you find the exact value of: 4sin 60degrees - 3tan 135degrees
*January 10, 2012*

**geometry**

a company logo is a rhombus with4-cm sides and angles of 60 degrees and 120 degrees. find the angle measures and side lengths if the logo is changed as follows
*January 9, 2012*

**Alebra**

Kathy works at an optical store selling eyeglasses. Each week she earns $180 plus a 2% commission of her total sales for the week. Next week she wants to earn at least $350. 1. Write an inequality that represents the dollar amount of eyeglasses kathy must sell to earn at least...
*January 3, 2012*

**Physics**

A vessel contains 10 kg of water and an unknown mass of ice at 0°C. The temperature of the vessel is monitored for 60 minutes. During the first 50 minutes, the temperature remains at 0°C. For the next 10 minutes, the temp steadily increases from 0°C to 2°C. a. ...
*December 8, 2011*

**physics**

A track star goes in the long jump at 10 m/s at 37 degrees above the horizontal. What is the magnitude of the horizontal displacement?
*December 7, 2011*

**Physics**

How can one find the magnitude and the directions of a resultant if Vector A is 35N @ 60' NE, and Vector B is 50N @ 20' NW?
*December 4, 2011*

**Physics**

How can one find the magnitude and the directions of a resultant if Vector A is 35N @ 60' NE, and Vector B is 50N @ 20' NW?
*December 4, 2011*

**math**

18a^3 + 30a^2 / 3a
*December 1, 2011*

**math**

18a^3 + 30a^2 / 3a
*December 1, 2011*

**chemistry**

What mass of KNO3 in grams would be required to prepare 0.6 liters of a 1.8 M KNO3 solution?
*November 29, 2011*

**Calculus**

A storage tank used to hold sand is leaking. The sand forms a conical pile whose height is twice the radius of the base. The radius of the pile increases at the rate of 2 inches per minute. Find the rate of change of volume when the radius is 5 inches.
*November 23, 2011*

**geometry**

I'm so confused...can someone please help??? I need to find the orthocenter of the triangle with the vertices R(-4,8), S(-1,5), T(5,5)??? How do you get 'y' for this problem?
*November 21, 2011*

**world history**

I have the same question on my test,I have my book in front of me and yes, it is D.
*November 18, 2011*

**Chemisty**

Iodine monobromide and ammonia react to produce nitrogen triiodide and ammonium bromide. (a) Balance the chemical equation for this reaction. (Use the smallest possible whole numbers. Enter 1 where appropriate. Do not leave any answer box blank.) . IBr(s) + . NH3(g) . NI3(s...
*November 16, 2011*

**Science**

Thermite is a mixture of iron(III) oxide and aluminum powders that is used in some countries to weld railroad tracks. It is a spectacular reaction to yield solid aluminum oxide that floats on the molten iron. When cooled, the iron is ground smooth and even with the rest of the...
*November 16, 2011*

**Science**

Al(OH)3(s) + HCl(aq) AlCl3(aq) + H2O(l) How many moles of HCl are required to react with 0.470 g of Al(OH)3 in the above unbalanced reaction? Use at least as many significant figures in your molar masses as in the data given. mol HCl What mass of HCl is required? How many ...
*November 16, 2011*

**math**

5.3+4=3.24-2.7
*November 14, 2011*

**math**

5.3+4=3.24-2.7
*November 14, 2011*

**statistics**

A nationwide study indicated that 27% of adults said that chocolate was their favorite ice cream flavor. A simple random sample of 150 adults is obtained. A.) Describe the sampling distribtuion of p, the sample proportion of adults whose favorite ice cream flavor is chocolate...
*November 11, 2011*

**calculus**

Question 1 The figure below shows the rate of change of the quantity of water in a water tower, in liters per day, during the month of April. If the tower had liters of water in it on April 1, estimate the quantity of water in the tower on April . Round your answer to the ...
*November 10, 2011*

**Logic- Formal Proof**

I need to solve a proof and I cannot figure it out. The instructions say only that I will have to use subproofs within subproofs. Premises: A or B A or C Conclusion: A or (B and C)
*November 9, 2011*

**geometry**

what is the slope of the line determined by the equation 2x+y=5?
*November 8, 2011*

**fraction 10-1 math **

camp big trees has 3 red canoes and 4 blue canoes. what fraction of the conoes are red ?
*November 7, 2011*

**fraction 10-1 math **

camp big trees has 3 red canoes and 4 blue canoes. what fraction of the conoes are red ?
*November 7, 2011*

**Algebra**

Thank you so much!! It really helped me understand!
*November 4, 2011*

**Algebra**

Rationalize the denominator: 5 /4-squareroot 5 (five over four minus square root five) Please explain
*November 4, 2011*

**Algebra**

Thank you!
*November 4, 2011*

**Algebra**

Two hoses are connected to a swimming pool. Working together, they can fill the pool in 4 hr. The larger hose, working alone, can fill the pool in 6 hr less time than the smaller one. How long would it take the smaller one, woking alone, to fill the pool? Please explain
*November 4, 2011*

**english**

what is an appositive phrase?
*November 4, 2011*

**math**

write a matrix for x-y=8,-2x-5y-6z=-27, 9x+10y-z=54
*November 2, 2011*

**Culture Diversity**

I have a paper due soon where I need to interview three Japanese Americans. Could any Japanese American answer the following questions for me? I would greatly appreciate it! If you dont feel comfortable answering some of them just leave them blank, Thanks! What is your first ...
*November 2, 2011*

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