Monday

February 27, 2017
Total # Posts: 1,149

**physics**

A trapeze artist, starting from rest, swings downward on the bar, lets go at the bottom of the swing, and falls freely to the net. An assistant, standing on the same platform as the trapeze artist, jumps from rest straight downward. Friction and air resistance are negligible...

*January 19, 2011*

**Chemistry**

a. 12

*January 19, 2011*

**math**

Use the digits 0,2,4,5,6 and 8 to write two money amounts that you can subtract by trading 1 dime for 10 pennies. Then solve.

*January 18, 2011*

**physics**

A 3.20 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal. The block accelerates to the right at 7.50 m/s2. Determine the coefficient of kinetic friction between block and ceiling. Would ...

*January 18, 2011*

**Physics**

The speed of a vehicle is 3.56 meters per second. Select from the list below all of the answers which express that speed and which are formatted so that CAPA can judge the answer [* means multiply, ^ means raise to a power, / means divide]. (Entering the NUMERICAL VALUE and ...

*January 11, 2011*

**Physics**

Calculate the volume of a spherical balloon which has a surface area of 0.0793 m2

*January 11, 2011*

**Civics and Economics**

what is the purpose of a fillibuster

*January 10, 2011*

**Pre-Algebra**

Mistu purchased a basketball hoop for her driveway from a sporting goods store. After the sales tax rate of 5.5% was applied, the total cost came to $179.35.How much money would Mistu have saved if she had used a coupon good for 10% discount?

*January 6, 2011*

**3rd grade social studies**

what is Acropolis and where was Acropolis? Thanks!

*January 4, 2011*

**3rd grade social studies**

what is agora

*January 4, 2011*

**3rd grade social studies**

geography why were seas important on the continent of Europe? What were seas used for? Please help! Thanks.

*January 4, 2011*

**Chemistry**

Determine the mass of phosphoric acid that can be produced by the reaction of 1 ton of phosphate rock, Ca(PO4)2, and sulfuric acid.

*January 2, 2011*

**Chemistry**

Determine the mass of phosphoric acid that can be produced by the reaction of 1 ton of phosphate rock, Ca(PO4)2, and sulfuric acid.

*January 2, 2011*

**Chemistry**

Determine the mass of phosphoric acid that can be produced by the reaction of 1 ton of phosphate rock, Ca(PO4)2, and sulfuric acid.

*January 2, 2011*

**11th grade**

d sensitive to variations in any currency

*December 21, 2010*

**math**

16g of mix for each litre of water so how many grams in 100ml

*December 13, 2010*

**10th grade**

A volume is measured experimentally as 4.5 mL. What is the percent error, given that the correct value is 4.17 mL? answer units in %

*December 11, 2010*

**5th grade math**

No, divide 24 by 3/4. remember you need to multiply by the opposite of the fraction so it is 24 times 4 and dived by 3 :) answer:32

*December 8, 2010*

**Precalculus**

2sin^2x+3cosx=3 find all solutions in the interval [0,2pi]

*December 8, 2010*

**Precalculus**

2sin^2x+3cosx=3

*December 8, 2010*

**science**

To know what kind of disease/health condition that you may be at risk of.

*December 8, 2010*

**9th grade**

at 20 degrees celsius, how much sodium chloride could be dissolved in 2 L of water?

*December 7, 2010*

**Physics**

if a 120-g mass is placed at the 25-cm mark and a 25-g mass at the 10-cm mark, where should a 500-g mass be placed to balance the system?

*December 7, 2010*

**Math**

The shorter leg of a right triangle is 14 feet shorter than the longer leg. The hypotenuse is 26 feet. How long is each leg?

*December 4, 2010*

**sociology**

It's funny... they're still using this question even now. I have sociology right now and this was our week 7 assignment. Good to know things haven't changed, huh?

*December 3, 2010*

**math**

what set of 7 numbers have the following landmarks'''' mode 21 median 24 maximum 35 range 20

*December 1, 2010*

**Finance**

John has a chocie to make between two investment opportunities. investment 1, would bear a interest of 12.5% over a period of 5 years but is taxable. investment 2 would bear an interest of 8% over the same period but is tax exempt. If john 's taxable rate is 12% which ...

*December 1, 2010*

**physics**

Review Conceptual Example 2 in preparation for this problem. In Figure 5.4, an object, after being released from its circular path, travels the distance OA in the same time it would have moved from O to P on the circle. The speed of the object on and off the circle remains ...

*November 29, 2010*

**math**

$240

*November 25, 2010*

**physics**

I think that power is actually equal to the change in voltage multiplied by the current, not just the voltage itself. Or at least that is what my formula sheet says. Good luck! I'm working on the same question

*November 23, 2010*

**Math**

If Betsy leaves Town A traveling due east for 6 miles to Town B, then turns due north and travels 9 miles to Town C, how far will her trip home be to Town A as she travels directly southwest?

*November 20, 2010*

**Math**

If Betsy leaves Town A traveling due east for 6 miles to Town B, then turns due north and travels 9 miles to Town C, how far will her trip home be to Town A as she travels directly southwest?

*November 20, 2010*

**physics**

its not right. i checked

*November 20, 2010*

**physics**

A rocket of mass 4.50 105 kg is in flight. its thrust is directed at an angle of 64.0° above the horizontal and has a magnitude of 7.50 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the horizonal.

*November 20, 2010*

**physics**

A 1000 kilogram car traveling at 25 mph hits a 60 kg person. How much force is exerted on the person?

*November 17, 2010*

**math**

47.6

*November 17, 2010*

**physics**

A 1000 kilogram car traveling at 25 mph hits a 60 kg person. How much force is exerted on the person?

*November 17, 2010*

**Math**

Name 3 different ways in which these numbers can be classified. 11 4.5 50 8 16 3/5 100 20 9 8.6 14 1/2

*November 16, 2010*

**math**

Name some different ways in which these numbers can be classified. 11,4.5,50,8,16,3/5,100,20,9,8.6,141/2

*November 16, 2010*

**Physics & Calc**

Derive the stationary target equations: v1 = [(m1-m2)/(m1+m2)]v1 v2 = [(2m1)/(m1 + m2)] v1

*November 11, 2010*

**physics**

A woman stands on a scale in a moving elevator. Her mass is 71.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9440 N. What does ...

*November 10, 2010*

**physics**

The weight of an object is the same on two different planets. The mass of planet A is only fifteen percent that of planet B. Find rA/rB, which is the ratio of the radii of the planets.

*November 7, 2010*

**physics**

A rock of mass 48 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 275 N. What is the magnitude of the acceleration of the rock?

*November 7, 2010*

**Physics**

Water is moving with a speed of 5.0 m/s through a pipe with a cross-sectional area of 4.2 cm2. The water gradually descends 8.2 m as the pipe increases to 9.0 cm2. (a) What is the speed at the lower level? (b) If the pressure at the upper level is 1.8 × 105 Pa, what is ...

*November 7, 2010*

**physics please help**

I used the same equation as you did for average force, but when I divided change in momentum by time of impact I got 444. averageforce=changemomentum/timeimpact =(1.80)/(4.05*10^3) = 444.4

*November 5, 2010*

**Math**

If n ÷ d gives a display of 16.8, does d\n? Why

*November 4, 2010*

**Physics - Standing Waves**

a) It's a straight line because it is a function os the form y=mx+b b) The slope of the line if m=0.5 c) The intercept of ln v is -0.5ln(LMD) and the intercept of the ln T axis is 0.5 ln (LMD)

*November 4, 2010*

**chemistry**

What is the molarity of NaOCL in a solution of bleach if 10.00mL requires 22.35mL of 0.0291 M Na2S2O4 to reach the endpoint.

*November 3, 2010*

**p``**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3640 kg space tug and a 6500 kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 500 m ...

*November 1, 2010*

**Physics**

An office window has dimensions 3.6 m by 2.5 m. As a result of the passage of a storm, the outside air pressure drops to 0.925 atm, but inside the pressure is held at 1.0 atm. What net force pushes out on the window?

*November 1, 2010*

**5th grade math**

3x=x with x= the quantity the brother has

*November 1, 2010*

**Physics**

Apply T=T and use uk an us but u must have uk biger than the force

*November 1, 2010*

**Chemistry**

How fast must a 144 g baseball travel in order to have a de Broglie wavelength that is equal to that of an x-ray photon with = 100. pm?

*November 1, 2010*

**Chemistry**

Calculate the energy difference (E) for the transition from n = 1 to n = 6 energy levels of hydrogen per 1 mol of H atoms. (Report your answer to at least 3 significant figures.)

*November 1, 2010*

**chemistry**

Suppose the ΔGof, ΔHof, and ΔSo are available and valid at 298 K. Which equation(s) could be used to calculate the change in Gibbs Energy if all product and reactant concentrations (pressures) are 1 M (1 atm) and the temperature is 298 K? Choose all that apply...

*October 27, 2010*

**chemistry**

how quickly must a 54.7 g tennis ball travel i order to have a de Broglie wavelength that is equal to a photon of green light?

*October 24, 2010*

**English**

Is this a simile or a metaphor The rain felt like small kisses on Rosemary's face,

*October 21, 2010*

**Chemistry**

When 32.0 mL of 0.560 M H2SO4 is added to 32.0 mL of 1.12 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted. (Assume that the total volume is the sum of the individual volumes ...

*October 20, 2010*

**Chemistry**

A 30.5 g sample of an alloy at 93.7°C is placed into 50.1 g water at 23.4°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the ...

*October 20, 2010*

**physics**

The only force acting on a 3.0 kg body as it moves along the positive x axis has an x component Fx = -9x N, where x is in meters. The velocity of the body at x = 2.3 m is 9.7 m/s. (a) What is the velocity of the body at x = 4.4 m? (b) At what positive value of x will the body ...

*October 18, 2010*

**Chemistry**

A 26.5 g sample of ethylene glycol, a car radiator coolant, loses 675 J of heat. What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/gK)? Please help me, I don't even know where to begin!!

*October 18, 2010*

**Chemistry**

What is the enthalpy change when 17.0 g of water is cooled from 36.0°C to 6.40°C?

*October 18, 2010*

**Chemistry**

3 M HCl solution was used to generate CO2 from the CaCO3 . What will be the effect on the value reported for the molar volume of CO2 if 6 M HCl was used instead (too high, too low, no difference)? Explain.

*October 16, 2010*

**physics**

Two cars, A and B, are traveling in the same direction, although car A is 174 m behind car B. The speed of A is 25.6 m/s, and the speed of B is 18.6 m/s. How much time does it take for A to catch B?

*October 16, 2010*

**Chemistry**

A mixture of gases collected over water at 14C has a total pressure of 1.198 atm and occupies 72 mL. How many grams of water escaped into the vapor phase?

*October 15, 2010*

**Spanish-SraJMcGin-please check**

Posted by Megan on Wednesday, October 13, 2010 at 5:08pm. I just reposted this from the earlier post- I have two questions about translation. If asked this question, how do I answer it. Cual es tu numero de telefono? I know it is asking my phone number which is 447-7161 but I ...

*October 13, 2010*

**Spanish-SraJMcGin-Please check**

Hola, I know about the accent marks-I use spanish typeit and do my work in there when I have to type it-sorry about not doing it here One question, I can only use the words my teacher taught so far in Spanish and I didn't learn ir a nadar for the second one. Can I just put...

*October 13, 2010*

**Spanish**

No numero de telfono-doesn't that say no number of telephone is .... instead of my phone number is .... For what I like to do on Sat. can I say El sabado me gusta....

*October 13, 2010*

**Spanish**

I have two questions about translation. If asked this question, how do I answer it. Cual es tu numero de telefono? I know it is asking my phone number which is 447-7161 but I don't know how to put it in sentence form. The next question is Que te gusta hacer el sabado? I ...

*October 13, 2010*

**physics**

Suppose the water near the top of Niagara Falls has a horizontal speed of 2.7 m/s just before it cascades over the edge of the falls. At what vertical distance below the edge does the velocity vector of the water point downward at a 72° angle below the horizontal?

*October 13, 2010*

**Computers**

How to do Excel Spreadsheet- Formulas? I have to do an excel spreadsheet for my computer class. Problem is my professor didn't at all explain how to do it. What formulas am I supposed to use! Please Help. The info he gave us are : Cash Sales: 56%, Rec. Last month: 28%, Rec...

*October 13, 2010*

**geography**

decreased conflict in eastern Europe

*October 13, 2010*

**Algebra-Please help-I'm desperate to understand**

Posted by Megan on Tuesday, October 12, 2010 at 3:44pm. I have a question if someone could help, please explain it. Given b = -1 and h = -1, what is the equation of the graph if the parent function of the radical is y = square root (x) The x should be under a square root sign...

*October 12, 2010*

**Algebra-drwls please check!**

Hi, no I just checked this-all they wanted was what a (-b) qunatity and a negative (h) quantity would do to the parent function- like how it would be written If you had the parent function y = square root of (x)-how a negative b and negative h would affect it

*October 12, 2010*

**Algebra-drwls please check!**

Posted by Megan on Tuesday, October 12, 2010 at 3:44pm. I have a question if someone could help, please explain it. Given b = -1 and h = -1, what is the equation of the graph if the parent function is y = sqrt (x) Answers: a.y = sqrt(x-1) b.y = sqrt (-x+1) c.y = - sqrt (-x-1) ...

*October 12, 2010*

**Algebra drwls please check**

Can you please check my problem Thank you

*October 12, 2010*

**Algebra**

I have a question if someone could help, please explain it. Given b = -1 and h = -1, what is the equation of the graph if the parent function is y = sqrt (x) Answers: a.y = sqrt(x-1) b.y = sqrt (-x+1) c.y = - sqrt (-x-1) d.y = sqrt(-x-1) I think it is "b"

*October 12, 2010*

**Geometry**

the measure of the supplement of an angle is 40 more than two times the measure of the complement of the angle find the measure of the angle

*October 11, 2010*

**AP CHEM**

19. Burning coal and oil in a power plant produces pollutants such as sulfur dioxide, SO2. The sulfur-containing compound can be removed from other waste gases, however, by the following reaction: 2 SO2(g) + 2 CaCO3(s) + O2(g) 2 CaSO4(s) + 2 CO2(g) [Molar masses: 64....

*October 7, 2010*

**Chemistry :(**

Disulfur dichloride, S2Cl2, is used to vulcanize rubber. It can be made by treating molten sulfur with gaseous chlorine: S8(l) + 4 Cl2(g) --> 4 S2Cl2(l) [Molar masses: 256.6 70.91 135.0] Starting with a mixture of 32.0 g of sulfur and 71.0 g of Cl2, which is the limiting ...

*October 7, 2010*

**Chemistry**

Calculate the pH, to one decimal place, of the solution made by mixing 21.0 mL of 0.33 M HNO3 with 121.0 mL of 0.32 M formic acid (HCOOH)

*October 7, 2010*

**Chemistry**

Experiment 10: Which Fuels provide the most heat? There are many possible sources of error in this experiment. List three that you can think of. Would each error have a large effect, a medium effect, or a small effect on the calculated heat content of a fuel? Also indicate ...

*October 7, 2010*

**Chemistry!**

Experiment on Which Fuels Provide the Most Heat? Comparison of the Energy Content of Fuels. Suppose you put 50 mL of water in the can instead of 100 mL and heated it 40 degrees instead of 20 degrees. In what ways, if any, would this affect the results of the experiment? What ...

*October 7, 2010*

**Chemistry**

The arrow goes after the C6H5CH2COOH

*October 4, 2010*

**Chemistry**

OH- + C6H5CH2COOH H2O + C6H5CH2COO- What is the K for the reaction above in terms of Ka's, Kb's, Kw etc.?

*October 4, 2010*

**Chemistry**

H- + C6H5CH2COOH = H2O + C6H5CH2COO- What is the K for the reaction above in terms of Ka's, Kb's, Kw etc.?

*October 4, 2010*

**science**

At -8 degrees celseis what state is bromime in?

*October 2, 2010*

**physics**

What average force is needed to accelerate a 6.00-gram pellet from rest to 110 over a distance of 0.800 along the barrel of a rifle?

*September 24, 2010*

**Science**

3. constant angular velocity When a rigid body is being rotated, every particle within the body will rotate in the same direction, while retaining its original shape. The omega(angular velocity) will remain the same.

*September 20, 2010*

**chemistry**

yes, it really does help. How did you decided that it absorbed heat? I though exothermic reactions released it.

*September 19, 2010*

**chemistry**

I don't understand how you decide what is increasing or decreasing and how you tell.

*September 19, 2010*

**chemistry**

2 NO2(g) N2(g) + 2 O2(g) The ΔH° for the reaction above is -66.4 kJ. The system is initially at equilibrium. What happens if N2 is added to the reaction mixture at constant temperature and volume? The reaction absorbs energy. The reaction releases energy. [NO2] ...

*September 19, 2010*

**Chemistry**

H2(g) + I2(g) 2 HI(g) The forward reaction above is exothermic. At equilibrium, what happens if I2 is removed from the reaction mixture at constant temperature and volume? The reaction absorbs energy. The reaction releases energy. [H2] increases. [H2] decreases. [H2] remains ...

*September 19, 2010*

**Chemistry**

Find the volume in liters of 0.452 M manganese(II) sulfate that contains 54.5 g of solute?

*September 19, 2010*

**college-history**

What parallels, or differences, can you identify between Athenian expansionism in the age of the Peloponnesian War and the contemporary career of the American republic?

*September 18, 2010*

**pre cal**

Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the polynomial completely. List all the real zeros of the function. x^3 - 28x - 48 = 0 Value of x = -4 Please help!!Thank you

*September 17, 2010*

**physics**

If your car decelerates at a rat of 4.5 m/s2 how long will it take for your car to stop?????

*September 14, 2010*

**chemistry**

is INH(CH3)3 an acid, base or neutral?

*September 14, 2010*

**math 5 grade**

which x = 300 a 2x30 x6 b 10x6x20 c15x2x10 d 2x3x15

*September 13, 2010*

**math**

leon rents a video for $5. he returns the video game 3 days late. the late fee is $1 for each day late.simplify the expression 5+3.1 to find out how much it costs leon to rent the video game

*September 10, 2010*