Wednesday

May 4, 2016
Total # Posts: 2,126

**Physics**

sum of forces-> F=ma F(friction)= ufn* you don't need this F(applied)-F(friction)=ma f(a)-f(f)=ma f(a)/ma=f(f) add numbers
*November 22, 2010*

**Grade 10 Math**

-b over 2a to find x value for max and add that to the 3 metres
*November 20, 2010*

**chemistry**

A gaseous mixture contains 75 grams of N2 and 25 grams of Ar. What is the pressure due to Argon?
*November 17, 2010*

**Honors PRE CALCULUS**

Thanks so much! My teacher never gave is that equation. She just told us to go home and try to learn the method.
*November 16, 2010*

**Honors PRE CALCULUS**

Three different weights are suspended from three different springs. Each spring has an elasticity coefficient of 18.5. The equation for the vertical displacement is y= 1.5cosine(t times the square root of k/m), where t is time, k is the elasticity coefficient, and m is the ...
*November 16, 2010*

**Honors PRE CALCULUS**

Three different weights are suspended from three different springs. Each spring has an elasticity coefficient of 18.5. The equation for the vertical displacement is y= 1.5cosine(t times the square root of k/m), where t is time, k is the elasticity coefficient, and m is the ...
*November 16, 2010*

**11th grade**

Three different weights are suspended from three different springs. Each spring has an elasticity coefficient of 18.5. The equation for the vertical displacement is y= 1.5cosine(t times the square root of k/m), where t is time, k is the elasticity coefficient, and m is the ...
*November 16, 2010*

**Chemistry**

What is the structure of SN? I thought .:S=N:: or ::S=N:. but both were deemed wrong by the homework software we have... help!
*November 9, 2010*

**math**

how to devide 34/123.08
*November 8, 2010*

**Physics HELP HELP**

A cue ball traveling at 4.0 m/s makes a glancing, elastic collision with a target ball of equal mass that is initially at rest. The cue ball is deflected so that it makes an angle of 30° with its original direction of travel. (a) Find the angle between the velocity vectors...
*November 8, 2010*

**Physics**

61 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 29 m/s. If the player was moving upward with a speed of 4.0 m/s just before impact, what will be the speed of the ball immediately after the collision if the ...
*November 7, 2010*

**Physics**

A pitcher claims he can throw a 0.157 kg baseball with as much momentum as a 1.5 g bullet moving with a speed of 1.50 multiplied by 103 m/s. (a) What must the baseball's speed be if the pitcher's claim is valid? m/s (b) Which has greater kinetic energy, the ball or the...
*November 6, 2010*

**Physics**

Using P=(RnT)/V, where T=1(arbitrary constant), and R = 8.314: Calculate volume at initial condition. Use this volume and final pressure to calculate n final. Subtract n final from n inital.
*November 5, 2010*

**trig**

A bicyclist is riding at 15 mph and her bike has wheels with a radius of 14 inches. She rides over a wad of gum which sticks in the tire. Assume this is t=0 seconds. a.)Find a function that gives the height in inches above the ground of the gum, with the input in seconds. Also...
*November 3, 2010*

**Algebra**

-3x + 2y = 2
*November 2, 2010*

**Algebra**

-3x + 2y =2
*November 2, 2010*

**Physics**

Use the equation Friction Force (Ff) =mu*N mu is a Greek letter representing the friction force and the N is the normal, or whatever the weight of the object is pushing down. So algebraically solve the equation by plugging in: 50=mu*500 50/500=mu so therefore 1/10=mu or 0.1 ...
*November 1, 2010*

**algebra**

two investments were made totaling $15,000. for a certain year these investments yielded $1432 in simple interest. part of the $15,000 was invested at 9% and part at 10%. find the amount invested at each rate. a total of $1150 was invested, part of it at 12% and part at 11%. ...
*November 1, 2010*

**Business Finance**

Jungle, Inc., has a target debt−equity ratio of 0.72. Its WACC is 11 percent, and the tax rate is 31 percent. (Do not include the percent signs (%). Round your answers to 2 decimal places. (e.g., 32.16)) Required: (a) If Jungle's cost of equity is 14 percent, its ...
*October 31, 2010*

**physics**

A 615 kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed. (a) What is the acceleration of the car?
*October 26, 2010*

**grade 9 algebra**

8x-5y-x=9-y
*October 24, 2010*

**Physics**

horizontal
*October 21, 2010*

**Physics**

A 1.95 kg block is held in equilibrium on an incline of angle q = 53.1o by a horizontal force, F, applied in the direction shown in the figure below. If the coefficient of static friction between block and incline is ms = 0.313, determine the minimum value of F.
*October 21, 2010*

**math**

^Yo that's wrong
*October 20, 2010*

**Chemistry**

When 33.5 mL of 0.535 M H2SO4 is added to 33.5 mL of 1.07 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 19, 2010*

**college algebra**

a bus driver wants to average at least 40 miles per hour on a 70 mile trip. if the first 35 miles takes the driver 1 hour what should be the lowest average speed for the second 35 miles?
*October 17, 2010*

**chemistry**

A 0.1943g iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe 2+ (aq). The iron solution was titrated with Ce 4+ solution according to the balanced chemical reaction shown below.After calculation, it was found that 0.0237 g of iron from the ore ...
*October 17, 2010*

**ALgebra**

tom scores 83,88,75, and 90 on the first 4 tests in algebra. what does he need to get on the 5th test to have an average of 85?
*October 16, 2010*

**calculus**

Find d2y/dx2 in terms of x and y. y5 = x6
*October 15, 2010*

**caculus 1, please help **

Find d2y/dx2 in terms of x and y. y5 = x6
*October 15, 2010*

**calculus 1 **

So, What do u think how we solve this? :)
*October 15, 2010*

**algebra**

A cube measuring 6.7 cm along each edge has a mass of 78g. Find the density of the cube.
*October 14, 2010*

**math**

Train leaves a stationa traveling at 60 miles per hour. Eight hours later train B leaves the same station traveling in the same direction at 80 miles per hour. How long does it atke for train B to catch up to train A.?
*October 14, 2010*

**physics (projectile motion)**

A cow on a trebuchet is catapulted toward a castle wall. The cow is released with an inital velocity of 50 m/s at a 60 degree angle above the horizontal. At its release the cow is 8 m above the ground. The castle wall is 100 m from the trebuchet and the ground level of the ...
*October 13, 2010*

**physics (projectile motion)**

A cow on a trebuchet is catapulted toward a castle wall. The cow is released with an inital velocity of 50 m/s at a 60 degree angle above the horizontal. At its release the cow is 8 m above the ground. The castle wall is 100 m from the trebuchet and the ground level of the ...
*October 13, 2010*

**College Physics**

As part of a training program, an athlete runs while holding 8.00 weights in each hand. As he runs, the weights swing through a 30.0 arc in . His hands are 72 from his shoulder joint, and they are light enough that we can neglect their weight compared with that of the 8.00 ...
*October 10, 2010*

**Us History**

8. 4th amendment, search and seizure
*October 10, 2010*

**Spanish 1**

Thank you
*October 10, 2010*

**Spanish 1**

Thank you-I appreciate the explanation
*October 10, 2010*

**Spanish 1**

Which subject pronoun would you use in Spanish to talk about: Jauana y Carlos a. ellos b. usted c. ustedes d. ella I'm not sure because I think Juana is a girl and so how do you talk about a girl and boy Thank you
*October 10, 2010*

**algebra**

the time that a traffic light remains yellow is 1 second more than 0.05 times the speed limit. what is the yellow time for a trafic light on a street with a speed limit of 30 mi/h
*October 9, 2010*

**college physics**

Two workers are loading crates onto a pick up truck. Worker 1 lifts his crate straight up from the ground to the truck. Worker 2 slides his crate up a ramp which has frictionless rollers. Which statement is true about the work being done on the crate? a. Worker 1 does more ...
*October 5, 2010*

**college physics**

Three identical balls are thrown from the top of a building, all with the same initial speed. The first is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal. Neglecting air resistance, rank the speeds of the ...
*October 5, 2010*

**college physics**

Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
*October 5, 2010*

**college physics**

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the same moment? ( d) Can...
*October 5, 2010*

**physics**

Three identical balls are thrown from the top of a building, all with the same initial speed. The first is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal. Neglecting air resistance, rank the speeds of the ...
*October 5, 2010*

**physics**

Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
*October 5, 2010*

**physics**

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the same moment? ( d) Can...
*October 5, 2010*

**physics**

Two workers are loading crates onto a pick up truck. Worker 1 lifts his crate straight up from the ground to the truck. Worker 2 slides his crate up a ramp which has frictionless rollers. Which statement is true about the work being done on the crate?
*October 5, 2010*

**chemistry**

using the values for heat of fusion, specific heat of water, or heat of vaporization, calculate the amount of heat energy. Calories needed to warm 20.0g of water at 15 degrees Celsius to 72 degrees Celsius (one step) Show work please
*October 3, 2010*

**Chemistry**

What is the net ionic reaction of Barium Phosphate and Phosphoric Acid? I tried H + 2PO4 + 3Ba + OH -> Ba3(PO4)2 + H2O, and 6H + 2PO4 + 3Ba + 6OH -> Ba3(PO4)2 + 6H2O but the homework software says both are wrong. What is wrong with it?
*October 1, 2010*

**statistics**

choices: a) About 68% of the trees are between 6.5 and 9.5 feet tall b) About 75% of the trees are between 5 and 11 feet tall c) At least 75% of the trees are between 5 and 11 feet tall d) At least 75% of the trees are betwwen 6.5 and 9.5 feet tall
*September 26, 2010*

**statistics**

13) You are told that the mean height of trees around the Physics building is 8 feet tall, with a standard deviation of 1.5 feet. Which is the most appropriate statement you can make, based on this information?
*September 26, 2010*

**physics**

poo
*September 23, 2010*

**math**

The amount of money M in a piggy bank containing only nickles and dimes d, when there are five more nickels than dimes.
*September 22, 2010*

**math**

How many different ways can you make change using 25-cents coin using dimes, nickels and pennies?
*September 22, 2010*

**math**

Rounded to the nearest ten I am 40. The sum of my digits is 11.
*September 20, 2010*

**Managrial Economics **

Anyone has answer for this please? A New Hampshire resort offers year-round activities: in winter, skiing and other cold-weather activities; and in summer, golf, tennis, and hiking. The resorts operating costs are essentially the same in winter and summer. Management charges ...
*September 19, 2010*

**Managerial Economics**

anyone has answer to this? Discussion question As vice president of sales for a rapidly growing company, you are grappling with the question of expanding the size of your direct sales force (from its current level of 60 national salespeople. You are considering hiring from 5 ...
*September 19, 2010*

**Chemistry**

419 kj into jules = 419000 Divide by avogadro's number 419000/6.022e23 Divide that by Planck's Constant for the answer.
*September 18, 2010*

**Physic**

It is possible to shoot an arrow at a speed as high as 121 m/s. (a) If friction is neglected, how high would an arrow launched at this speed rise if shot straight up?
*September 13, 2010*

**math**

thanks!
*August 26, 2010*

**math**

i need to put it in order i think it is 3.56 and then 3.546
*August 26, 2010*

**math**

which number is greater 3.546 or 3.56
*August 26, 2010*

**physics**

a ball with a mass of 0.150 g and positive charge of q=41.2 C is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of =22.0o from the vertical. What is the magnitude of the electric field?
*August 25, 2010*

**chemistry**

what is the pH of the buffer when 4ml of 1M HCl is added to a 100ml buffer solution made using 5ml 1M Na2HPO4 and 5ml 1M NaH2PO4? The pKa for H+ + HPO4- ==> H2PO4 is 6.82. What would happen to the pH if the 100ml buffer had been made up at the starting pH (6.82) using Tris...
*August 23, 2010*

**chemistry**

What happens when 4ml of 1M HCL is added to 100ml buffer made using 5ml 1M Na2HPO4 and 5ml 1M NaH2PO4? The pKa for H+ + HPO4- = H2PO4 is 6.82.
*August 17, 2010*

**economics**

This statement is incorrect, when price decreases and demand is relatively elastic, revenue (and expenditure) will rise.
*August 14, 2010*

**math**

how can fisherman save gas
*August 6, 2010*

**English-Literature**

b grave
*July 27, 2010*

**Physics**

A 1.50 kg snowball is fired from a cliff 13.0 m high with an initial velocity of 14.0 m/s, directed 41.0° above the horizontal. (a) Using energy techniques, rather than techniques of Chapter 4, find the speed of the snowball as it reaches the ground below the cliff. m/s (b...
*July 24, 2010*

**Chemistry**

3.40848g. I put this in and it was right.
*July 24, 2010*

**math**

The volume of a cone is three hundred cubic kilometers. If the radius of the base is 9 kilometers, what is the height of the cone? Use three point one four for pi. Show your work and round to the nearest tenth.
*July 22, 2010*

**Chemistry**

A sample of sodium-24 with an activity of 12 mCi is used to study the rate of blow flow in the circulatory system. If sodium -24 has a half-life of 15 hours, what is the activity of the sodium after 2.5 d ?
*July 20, 2010*

**Physics**

A 1.00 kg particle has the xy coordinates (-1.20 m, 0.500 m) and a 3.00 kg particle has the xy coordinates (0.600 m, -0.750 m). Both lie on a horizontal plane. At what (a) x and (b) y coordinates must you place a 1.00 kg particle such that the center of mass of the three-...
*July 20, 2010*

**Math**

How do you find the perimeter and area of a right triangle?
*July 18, 2010*

**Chemistryy**

14g I put it in and it's right.
*July 13, 2010*

**Science**

If Frankie the kangaroo climbed out of the crate and pushed the crate with a mighty 12 newtons of force against the efforts of Fred and the man (each applying 10 newtons of force), what would be the net force on the crate from all the pushing? 0 newtons *8 newtons 10 newtons ...
*July 13, 2010*

**Science**

Please Check 1.) If a quantity increases as a second quantity increases and decreases as the second quantity decreases the two quantities are said to be *a)Directly proportional b)Inversely proportional c)Completely unrelated d)Blue and red 2.) If a quantity increases as a ...
*July 13, 2010*

**Chemistry**

How much ammonia is produced if 1.80 m3 of hydrogen reacts with 0.5m3 of nitrogen? Also state which reagent is in excess and by how much? Question is related to the Haber process. Please can anyone answer this for me by 02 July 2010. With all equations. Thanx
*June 30, 2010*

**chemistry**

Thank you. :)
*June 30, 2010*

**History **

1.)Under the Articles of Confederation, _____. a)coordination among the States was difficult *b)Congress held both legislative and executive authority c)the national government could not force the States to obey its laws d)All of these answers are correct. 2.)Rhode Island ...
*June 26, 2010*

**ECONOMICS**

The question is is it T or F (true or false).
*June 22, 2010*

**Government**

1. a.)Absolutism,constitutional monarchy 5. c.)a direct democracy
*June 20, 2010*

**Government**

*= my answer 1. _____ is closely related to _____. a.)Absolutism,constitutional monarchy b.)Revolution, figurehead c.)Socialism, communism *d.)Authoritarianism, democracy 2. Popular sovereignty is _____. a.)the idea that the people are the ultimate source of authority b.)a ...
*June 20, 2010*

**English/Reading**

so I will change #6 to unsound opinion because it doesn't sound reliable.
*June 13, 2010*

**English/Reading**

Read the following statements and then determine whether they are facts, unsound opinions, sound opinions, or authoritative opinions. Select the correct answer for each statement. Are any of these correct/incorrect? If so please help. 1.)Due to Einstein's findings in the ...
*June 13, 2010*

**math**

1.) Write the equation for the line in slope-intercept form:Slope: m=3; Y-intercept: B=7 *y - 3 = 7(x - 3) *y = 3x + 7 *y = 7x - 3 2.)Write the equation for the line in slope-intercept form: Slope: m=4/3; Y-intercept: b=-2 *y = 4/3x - 2 *y + x = 2x + 1/2 *y = 1/2x - 2 3.)Which...
*June 12, 2010*

**Geo (locus)**

I don't fully get this stuff but some of these I guessed on and some I think I;m close so will someone check/ help me please? * is the answer I put 1. Point A is 0.5 cm from j. k and k are parallel and 1 cm apart. Find the locus of points that are 0.75 cm from A and ...
*June 12, 2010*

**College Physics**

A rock thrown horizontally at a large bell 54.0 m away is heard to hit the bell 4.80 s later. If the speed of sound is 330 m/s, what was the speed (in meters/second) of the rock? (Disregard gravity.)
*June 9, 2010*

**Science**

what is the molarity of a solution made by dissolving 7.5 g of magnesium nitrate in enough water to make 25.o mL of solution
*June 1, 2010*

**algebra**

write as an algebraic expression. 4 times the difference of a number and 3?
*June 1, 2010*

**science**

how many joules are required to evaporate 1 gram of boiling water?
*June 1, 2010*

**trig**

If (-2,5) is a point on the terminal side of an angle theta, find the exact value of the six trigonometric functions of theta. Then find the actual measure of theta.
*May 27, 2010*

**Algebra**

Find the domain of the function p(x)=2(pie2) -2x+9 What is the domain of p?
*May 27, 2010*

**aLGEBRA**

Find the domain of the function g(x)= 1/6-5x I know that x is a real number but I need the domain please.
*May 27, 2010*

**aLGEBRA**

Find the domain of the function p(x)=2(pie2) -2x+9 What is the domain of p?
*May 27, 2010*

**math**

Find the domain of the function p(x)=2(pie2) -2x+9 What is the domain of p?
*May 27, 2010*

**Math**

Find the domain of the function g(x)= 1/6-5x I know that x is a real number but I need the domain please.
*May 27, 2010*

**Math**

On top of the sears building is a tv tower. From a point 300 ft away the bottom of the tower is at an angle of elevation equal to 42.14 degrees and the top of the tower is at an angle of elevation equal to 45.81 degrees. How tall is the tower.
*May 19, 2010*