Friday

October 9, 2015
Total # Posts: 1,194

**Physics**

When spiking a volleyball, a player changes the velocity of the ball from 4.5 m/s to -20 m/s along a certain direction. If the impulse delivered to the ball by the player is -9.7 kg * m/s, what is the mass of the volleyball?
*March 29, 2011*

**physics**

In a typical golf swing, the club is in contact with the ball for about 0.0010s. If the 45-g ball acquires a speed of 41 m/s, estimate the magnitude of the force exerted by the club on the ball.
*March 29, 2011*

**Physics**

A 0.125-kg baseball is dropped from rest. If the magnitude of the baseball's momentum is 0.750 kg * m/s just before it lands on the ground, from what height was it dropped?
*March 29, 2011*

**algebra 2**

Use the function to answer the question. h(x) = 4|x| 3 What is the value of h(6)? (Points : 4) 27 21 21 27
*March 23, 2011*

**chemistry**

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide: NH4I(s) ↔ NH3(g) + HI(g) At 400ºC, Kp = 0.215. If 150 g of ammonium iodide is placed into a 3.00-L vessel and heated to 400ºC, calculate the partial pressure of ammonia when equilibrium is ...
*March 22, 2011*

**Statistics**

I am doing a stats study and im stuck on what test to perform. Please look at my subject and advise me.. I am testing to see whether a person that is best in math and science will be able remember more numbers than letters and if a person that is better in language and history...
*March 21, 2011*

**Titties**

I dont know but if its not related to tits it doesnt matter
*March 20, 2011*

**algebra**

Three points of a 5x5 square array are connected. How many square units are in the area of the largest possible triangle that can be formed?
*March 20, 2011*

**busineslae**

In the video game Corporate Cowboy, your task is to investigate complaints of wrongdoing on the part of corporate directors and officers, decide whether there is a violation of the law, and deal with the wrongdoers accordingly. Jane, a shareholder of Goodly Corporation, ...
*March 11, 2011*

**BUSINESS LAW**

Which side of this debate do you support? Is it possible to strike an appropriate balance between the rights of both groups on this issue? At issue in the twenty-first century is the trade-off between the necessity of writers, musicians, artists, and movie studios to profit ...
*March 8, 2011*

**physics**

traveling at 27.78 m/s with a deceleration rate of 5m/s squared.....How long will it take you to decelerate to 0.
*March 7, 2011*

**physics**

traveling at 27.78 m/s with a deceleration rate of 5m/s squared.....How long will it take you to decelerate to 0.
*March 7, 2011*

**Physics**

ΣFy=0 Normal Force = mass*gravity N=m*g ΣFx=ma Force of Friction = mass*velocity^2/radius F=m*v^2/r Force of Friction = Coefficient of static friction*Normal force F=Us*N So... Us*m*g=m*v^2/r Us=v^2/(r*g)
*March 6, 2011*

**math**

Mathmate- Thank you very much, I completely understand your explanation now.
*March 6, 2011*

**math**

How many two digit numbers are there in base 5. I really don't understand how to figure this out. I know it's been asked already, but I still don't understand it.
*March 6, 2011*

**Algebra**

In base 5, how many two digit numbers are there?
*March 5, 2011*

**physics**

A computer is reading data from a rotating CD-ROM. At a point that is 0.032 m from the center of the disc, the centripetal acceleration is 111 m/s2. What is the centripetal acceleration at a point that is 0.070 m from the center of the disc?
*March 4, 2011*

**Math**

Emmy is 12. She writes an equation to find her mother's age, m. m - 12 + 35 What operation solves the equation for m? add 12 to both sides, or subtract 12 from both sides, or multiply both sides by 12, or divide both sides by 12
*March 3, 2011*

**calculus**

determine the domain for each function f(x)=6x^(2)-x-1, g(x)=x-1
*February 27, 2011*

**calculus**

determine the domain for each function f(x)=x-6, g(x)=3x^(2)
*February 27, 2011*

**calculus **

determine the domain for each function f(x)=2x+3,g(x)=x-1
*February 27, 2011*

**math**

randy pedals his bicycle at a constant rate of 15 feet per second. which linear equation represent his total distance traveled y after x seconds?
*February 24, 2011*

**Chemistry**

In aqueous solution, hypobromite ion, BrO-, reacts to produce bromate ion, BrO3 -, and bromide ion, Br-, according to the following chemical equation. 3BrO-(ag) → BrO3 -(ag)+2Br-(ag) A plot of 1/[BrO-] vs. time is linear and the slope is equal to 0.056 M-1s-1. If the ...
*February 19, 2011*

**chemistry**

What is the rate law for N2O4+CO yields NO+CO2+NO2?
*February 16, 2011*

**Chemistry**

Ozone, O3, absorbs ultraviolet radiation and dissociates into O2 molecules and O atoms: O3 + hv --> O2 + O A 1.10 L sample of air at 22 degrees Celsius and 748mm Hg contains 0.25ppm of O3. How much energy, in joules, must be absorbed if all the O3 molecules in the sample of...
*February 14, 2011*

**earth science**

describe a possible pathway of carbon through the four spheres of the earth.Identifty what each the fourspheres of the earth contains
*February 13, 2011*

**Math**

Solve by factoring: (2x+9)(x-6)=0
*February 8, 2011*

**Math**

Multiply/divide and simplify: (12x^5-8x^3+4x)/(4x) The answer I got is 3x^4-2x^2+1. Is this correct?
*February 8, 2011*

**Math**

Simplify the expression: (3x^2-8x^3+4x)-(9x^2-x^3+x)+4(6x-7)
*February 8, 2011*

**physics**

would a larger rock dropped into a large pan of water make a larger wave than a smaller rock, and which would travel faster?
*February 2, 2011*

**Chemistry**

If 682000 kJ could be transferred with 100% efficiency to water, what volume of water, in liters, could be heated from 8.6 degrees Celsius to 60.0 degrees Celsius as a result?
*January 31, 2011*

**Statistics -Please help :/**

I need this as well......
*January 28, 2011*

**Statistics -Please help :/**

I'm having a problem with the entire Chi-square thing.. I do have answers to these but I'm not sure how to work them out.. If you could help that would be great! :) 1st part: A,B,C are schools. Is the choice of math programs followed independently by school? Write the ...
*January 28, 2011*

**5th grade math**

my sister say 76764546
*January 27, 2011*

**Chemistry**

What will be the final temperature of the water in an insulated container as the result of passing 6.00g of steam at 100.0 degrees Celsius into 100.0g of water at 24.0 degrees Celsius?
*January 27, 2011*

**...**

I happen to see this looking up my question and no. this was not me.. I'm wondering if "bj" took mine and modified it to make their own.. By the way, thank you for your help! I didn't get to reply because I was asleep..
*January 26, 2011*

**Chemistry**

After removing a crucible (containing CaCO3 obtained as a precipitate) from an oven, what could you do (if you were being extremely careful and had enough time) to prove that the CaCO3 is dry?
*January 26, 2011*

**math**

What is the answer to -12+r=-11
*January 26, 2011*

**Espanol III**

I am writing a composition for class and need someone to peer edit. No one around knows spanish so I am hoping someone here would be willing to look over it :) Thank you! Por primera, tú necesitas cambiar los hábitos. Si tú trabajas mucho para tener una ...
*January 26, 2011*

**Algebra 1**

x+x+1/3(x)=315
*January 26, 2011*

**Algebra 1**

answered.
*January 26, 2011*

**Physics **

A skier is gliding along at 2.62 m/s on horizontal, frictionless snow. He suddenly starts down a 16.9° incline. His speed at the bottom is 18.4 m/s. What is the length of the incline?
*January 25, 2011*

**Biology**

In each set up the dialysis tubing contains a solution of 30% glucose and safranin. However, the set ups differ in the contents of the beaker. The control set up has the same solution in the beaker while in the experimental set up it contains just water. In both the level of ...
*January 24, 2011*

**Math**

how do you convert 0.625 into a fraction
*January 24, 2011*

**Chemistry**

How do you make Tris into the acid form?
*January 24, 2011*

**Chemistry**

D is clearly the correct answer. In a sense, activation energy is related to temperature and at higher temps, molecules move faster and therefore have more frequent collisions. Catalysts lower the activation energy by bringing substrates together.
*January 24, 2011*

**algebra 2**

Farmer Brown wants to double the size of his rectangular backyard vegetable patch by adding a strip (of the same width) all the way around it. If its current patch is 12 feet by 18 feet, how wide does the strip need to be? how do you solve it step by step ?
*January 18, 2011*

**Mathematics**

no 11 1/8 she needs to reduce
*January 12, 2011*

**Trigonometry**

46
*January 12, 2011*

**math**

48 duh
*January 12, 2011*

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?
*January 12, 2011*

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?
*January 12, 2011*

**math**

If you put four 9-inch square boards together to make a bigger square, what would be the area of the new larger board in square feet?
*January 12, 2011*

**math**

all wrong
*January 12, 2011*

**math**

how do i write twenty-three hundredths as a number
*January 11, 2011*

**math**

Your answer will be zero. When you have a negative number like that in the beginning, you can make the problem much simpler by changing it. To change the problem, circle each number with the sign directly in front of it. So in this problem, circle the "-2" and the &...
*January 5, 2011*

**History**

What is predestination and how did it affect New England settlements? How did religion play a crucial role in the lives of New England women?
*January 4, 2011*

**Chemistry**

i think its 2. am i right ?
*January 3, 2011*

**Chemistry**

what is the total number of moles in 80.0 grams of C2H5Cl (gram-formula mass=64.5grams/mole)? (1)0.806 (2)1.24 (3)2.48 (4)5.16 i appreciate any help.
*January 3, 2011*

**Chem**

so for zinc it would be 65.3 ?
*January 2, 2011*

**Chem**

what is the gram atomic mass of zinc? is gram atomic mass the same as atomic mass ?
*January 2, 2011*

**trig**

Simplify the expression cotx divided by secx
*December 22, 2010*

**Math**

Many more depending on how you interpret the words of the song: 1 2 + 1 3 + 2 + 1 4 + 3 + 2+ 1 5 + 4 + 3 + 2+ 1 6 + 5 + 4 + 3 + 2+ 1 7 + 6 + 5 + 4 + 3 + 2+ 1 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2+ 1 11 + 10 + 9 + 8 + 7...
*December 13, 2010*

**Math**

Can't figure out the answer either need the equation explaining the relationship between s & t
*December 9, 2010*

**Chem**

did I do this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a ...
*December 7, 2010*

**Math**

Luke bought some thing at the store. He paid $5.98 for a pizza, $3.75 for a case of soda $2.50 for a box of brownie mix and $1.01 in sales tax. What information is needed to find Lukes correct change?
*December 6, 2010*

**Math**

C. 4/32
*December 6, 2010*

**Math**

Which fraction also belongs in set a? set - 3/24, 5/40, 9/72, 6/48 a. 4/24 b. 2/8 c.4/32 d. 8/40
*December 6, 2010*

**Math**

Jairo ears $256 for 50 hours of work. Write an equation(proportion) to find x his wages for 76 hours of work
*December 6, 2010*

**Chemistry**

is this right Consider the following reaction at equilibrium N2(g) + O2(g) + heat < = > 2NO(g) Indicate how each of the following will shift the equilibrium a. raising the temperature of the reaction. b. decreasing the volume of the reaction container. c. adding a ...
*December 6, 2010*

**English 101**

What does uncanny and marvelous mean?
*December 4, 2010*

**English 101**

What does uncanny and marvelous mean?
*December 4, 2010*

**Chem**

Calculate the percent yield of eugenol obtained considering the fact that clove oil is approximately 16-19 % clove by weight of cloves. isolated eugenol=061g purity of eugenol in clove oil=99.6% (based on clove oil gas chromatograph) Estimate the % yeild for eugenol.
*November 28, 2010*

**physics help**

wo thin rectangular sheets (0.13 m 0.52 m) are identical. In the first sheet the axis of rotation lies along the 0.13 m side, and in the second it lies along the 0.52 m side. The same torque is applied to each sheet. The first sheet, starting from rest, reaches its final ...
*November 27, 2010*

**chemistry**

why sugar dissolve in cooking oil
*November 25, 2010*

**Chemistry**

By titration it is found that 68.9 mL of 0.122 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
*November 22, 2010*

**Chemistry**

The flask shown contains 10.0 mL of HCl and a few drops of phenolphthaein indicator. The buret contains 0.270 M NaOH. What volume of NaOH is needed to reach the end point of the titration? What was the initial concentration of HCl?
*November 22, 2010*

**Chemistry**

Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2(s)+ H2SO4(aq)---> BaSO4(s)+ H2O2(aq) How many milliliters of 3.00 M H2SO4(aq) are needed to react completly with 85.1g of BaO2(s)?
*November 22, 2010*

**Chemistry**

3.13g if CuNO3 is dissolved in water to make a 0.270 M solution. What is the volume of the solution?
*November 22, 2010*

**Chemistry**

Calculate the number of moles of solute in 18.33 mL of 0.1115 M K2Cr2O7(aq)
*November 22, 2010*

**chemistry**

How many grams of solute are present in 205 mL of .340 M KBr?
*November 22, 2010*

**Algebra**

Determine if the equation y = 2^x represents exponential growth or decay I thought at first it was growth but now I think it might be decay because there is no "b" in a parentheses so do I assume b is less than 1 so it's decay? Please help
*November 22, 2010*

**phyiscs**

A uniform plank of length 4.5 m and weight 233 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 454 N walk on the overhanging part of the plank before it just begins to tip?
*November 19, 2010*

**chemistry**

CO (g) + Cl2 (g) ↔ COCl2 (g In one experiment, 0.93 bar of CO was combined with 1.01 bars of Cl¬2 in a reaction vessel at 700K. After the system reached equilibrium, the total pressure was 1.24 bars. Calculate Kp0 for the system.
*November 17, 2010*

**physics help**

A 1.0 kg object is suspended from a vertical spring whose spring constant is 130 N/m. (a) Find the amount by which the spring is stretched from its unstrained length.
*November 15, 2010*

**science**

Are all materials in 3d why or why not?
*November 15, 2010*

**materials**

are all materials in 3d?
*November 15, 2010*

**physics help**

A 8.6 kg board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 186 N/m and is parallel to the floor. Find the amount by which the spring is stretched from its unstrained length.
*November 15, 2010*

**Chem**

Can you please tell me if these are right? Classify the solutes in the following equations as a weak electrolyte, a strong electrolyte of a non electrolyte in water. a. XY2(s)=X2+(aq) +2Y-(aq) b. HX(g) ß=H+(aq) + X-(aq) c. XYZ(s)=XYZ(aq) d. YOH(s)=Y+(aq) + OH-(aq) a. ...
*November 14, 2010*

**integrals!!**

Compute the value of the integral using geometry. integral from -4 to 1 of (2x +8)dx
*November 8, 2010*

**calculus**

Referring to the Mean Value Theorem and Rolle's Theorem, how can I tell if f is continuous on the interval [a,b] and differentiable on (a,b).
*November 7, 2010*

**Chem**

Plese tell me if these are right. A 15.0-mL sample of NaCl solution has a mass of 15.78g. After the NaCl is evaporated to dryness, the dry salt residue has a mass of 3.26g. Calculate the following concentrations for the NaCl solution. a. %(m/m)= 3.26 x 100 / 15.78 = 20.7 b. %(...
*November 7, 2010*

**CHEM**

Will you please tell me if these are right? Write the symbol of the caton or anion that give(s) the following reaction:? 1. Forms a precipite with AgNO3 that does not dissolve in HNO3 2. Forms a gas with HCl 3. Give a bright, yellow-orange flame test 4. Forms a precipitate ...
*November 7, 2010*

**english**

Imagine you are on a local commission appointed to study the lack of proper recreation facilities for youth in your neighborhood. Decide what facilities should be recommended. Write an appropriate resolution to be presented to your county government. Remember to give the ...
*November 4, 2010*

**Physics**

Initially sliding with a speed of 2.3 m/s , a 1.8 kg block collides with a spring and compresses it 0.36 m before coming to rest. WHat is the force constant of the spring?
*November 3, 2010*

**physics please help**

A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) ...
*November 2, 2010*

**help me physics**

suppose the cart has mass m = 203 g, and it strikes the clay at speed vo = 5.24 m/s and comes to a dead stop. Assume the track is frictionless, and the clay is crushed inward by 1.83 cm. a)Find the magnitude of the impulse exerted by the clay on the cart. 1 N-m i got this ...
*November 1, 2010*

**physics**

A 4111.0 kg truck is parked on a 14.6° slope. What is the friction force on the truck?
*October 26, 2010*

**physics**

A woman has a mass of 42.9 kg. What is her weight on earth? and what is her weight on the moon, where g=1.17 m/s2
*October 26, 2010*