Saturday

October 25, 2014

October 25, 2014

Total # Posts: 124

**College Algebra (Word Problem)**

A rectangular eld is to be fenced o along the bank of a river; no fence is required along the bank of the river. The material for the fence costs 8 dollars per running foot for the two ends and 16 dollars per running foot for the side parallel to the river. If the area of...
*October 19, 2014*

**chemistry**

1) Aqueous solutions of potassium sulfate and ammonium nitrate are mixed together. Which statement is correct? A) Both KNO3 and NH4SO4 precipitate from solution B) A gas is released C) NH4SO4 will precipitate from solution D) KNO3 will precipitate from solution E) No reaction ...
*October 15, 2014*

**chemistry**

A beaker contain 300.ml of a 0,20 M Pb(NO3) solution. If 200 ml of 0,20M solution og MgCl2 is added to the beaker, What will be the concentration of Pb2+ ions in the resulting solution
*October 12, 2014*

**chemistry**

An unknown diprotic acid requires 26.66 mL of 0.117 M NaOH to completely neutralize a 0.845 g sample. what is the molar mass of the acid?
*October 12, 2014*

**chemistry**

A student weighs out 0.568 g of KHP (molar mass = 204 g/mol) and titrates to the equivalence point with 36.78 mL of a stock NaOH solution. What is the concentration of the stock NaOH solution? KHP is an acid with one acidic proton. a. 3.15 M b. 0.0757 M c. 0.943 M d. 0.100 M ...
*October 12, 2014*

**chemistry**

Thank you very much
*October 12, 2014*

**chemistry**

you have exposed electrodes of light bulb in a solution of H2SO4 such that the light bulb is on you add dilute solution and bulb goes dim which of the following could be the solution Ba(OH)2 NaNO3 K2SO4 Cu(NO3)2 none of the above
*October 12, 2014*

**chemistry**

An analytical procedure requires a solution of chloride ions ,How many grams of CaCl2 must be disolved to make2.15L of 0.0520 M C
*October 12, 2014*

**physics**

22) A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of A) less than 1 unit. B) more than 1 unit. C) 1 unit. D) not enough ...
*October 9, 2014*

**physics**

The x component of a displacement vector r is −149 m, while its y component is −174 m. (a) Find the magnitude of r. (b) Find the direction of r.
*October 7, 2014*

**chemistry**

n the spectroscopic analysis of many substances, a series of standard solutions of known concentration are measured to generate a calibration curve. How would you prepare standard solutions containing 10.0, 25.0, 50.0, 75.0, and 100. ppm of copper from a commercially produced ...
*October 6, 2014*

**chemistry**

Following oxidation-reduction reaction by using the oxidation state method a) O2+H2O+Pb=Pb(OH)2
*October 5, 2014*

**physics**

Thank you
*October 2, 2014*

**physics**

Drow a velocity time graph graph for the ball starting 1.0 s before the collision to wall and 1.0s after the collision
*October 2, 2014*

**physics**

Drow a velocity time graph graph for the ball starting 1.0 s before the collision to 1.0s after the collision
*October 2, 2014*

**chemistry**

A student mixes 4 reagents together thinking that the solution will neutralize each other . The solutions are mixed together are 50 ml of 0.100 M .hydrochloric acid 100 ml of 0.200 M of nitric acid 500 ml of 0.0100 M calcium hydroxide and 200 ml of 0.100 M of rubidium ...
*October 2, 2014*

**physics**

When a hammer strikes a nail, it is compressed along its length. Suppose that a steel nail 10.00 cm long and 3.00 mm in diameter is compressed an average of 65.0 µm by a 0.460 kg hammer during a 1.20 ms collision. (a) What average force was exerted on the nail by the ...
*October 1, 2014*

**physics**

A 0.450 kg hammer is moving horizontally at 6.00 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. (a) Calculate the duration of the impact. (b) What was the average force exerted on the nail?
*October 1, 2014*

**physics**

One hazard of space travel is debris left by previous missions. There are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. Calculate the force exerted by a 0.150 mg chip ...
*October 1, 2014*

**chemistry**

A 30 ml sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration is 0.0300 M give some possible identities for the unknown base
*October 1, 2014*

**chemistry**

10 ml sample of vinegar an aqueous solution 0f acetic acid( HC2H3O2) is titrated with 0.5062 M and 16.58 ml is required to reach equivalence point what is the molarity of the acetic acid b. if the density of vinegar is 1.006 g/cm3 what is the mass percent of acetic acid of ...
*September 30, 2014*

**physics**

A 96.5 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 45.5 m/s. If both are initially at rest and if the ice is friction less, how far does the player recoil in the time it takes the puck to reach the goal 18.0 m away?
*September 29, 2014*

**physics**

A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a speed of 0.540 m/s. The total mass of the sled, man, and rock is 93.5 kg. The mass of the rock is 0.300 kg and the man can throw it with a speed of 15.0 m/s. Both speeds are ...
*September 29, 2014*

**physics**

Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48-kg skater acquires a speed of 0.65 m/s. If the other skater acquires a speed of 0.84 m/s, what is her mass?
*September 29, 2014*

**chemistry**

Balance following oxidation reduction reactions using oxidation states method? a) Cl2(g) + Al(s) --> Al3+(aq) + Cl- b.) O2(g) + H2O(l) + Pb(s) --> Pb(OH)2(s) c) H+(aq) + MnO4-(aq) + Fe2+(aq) --> Mn2+(aq) + Fe3+(aq) + H2O(l)
*September 28, 2014*

**chemistry**

Thank you I appreciate it
*September 27, 2014*

**chemistry**

the concentration of a certain sodium hydroxide solution was determined by using using the solution to titrate a sample of KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. in the titration 34.67ml of the sodium hydroxide solution required to react with...
*September 27, 2014*

**chemistry**

30 ml of sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration 0.0300 M give the possible identities for the unknown base
*September 27, 2014*

**chemistry**

a student mixes 4 reagents together thinking that the solution will neutralize each other . The solution is mixed together are 50 ml of 0.100 M of HCL and 100 ml of 0,200 M of nitric acid 500 ml of 0.0100 M ca hydroxide and 200 ml of 0.100 M rubidium hydroxide . Did the acid ...
*September 27, 2014*

**physics**

Is momentum conserved when 2 carts having the same mass & the same speed collide, stick together and stop? what about the velocity
*September 25, 2014*

**chemistry**

what mass of silver chloride can be prepared by the reaction of 100 ml 0,20 M of silver nitrate with 100,0 ml of 0.15 M calcium chloride calculate the concentration of each ion reamaining in solution after the precipitation is complete
*September 24, 2014*

**ap chemistry**

what mass of barium sulfate can be produced when 100 ml 0.100 M of solution of barium chloride is mixed with 100.0 ml of a 0.100 M solution of Iron (III) sulfate
*September 24, 2014*

**ap chemistry**

what volume 0,100M of Na2PO4 is required to precipatate all the lead(II) ions from 150 ml of 0.250M Pb(NO3)2
*September 24, 2014*

**ap chemistry**

what volume of0.100 M NaPO4 is required to precipitate all the lead(II) ions from 150ml of 0.254 M Pb(NO3)2
*September 24, 2014*

**Math**

What does "Larger number exceeds three times the smaller number by four" mean?
*April 21, 2014*

**algebra**

Okay thanks, Marissa is my sister.
*November 20, 2013*

**algebra**

To the nearest tenth of an inch, find the length of a diagonal of a square whose side length is 8 inches.
*November 20, 2013*

**Calculus**

Consider the curve given by y^2 = 2+xy (a) show that dy/dx= y/(2y-x) (b) Find all points (x,y) on the curve where the line tangent to the curve has slope 1/2. (c) Show that there are now points (x,y) on the curve where the line tangent to the curve is horizontal. (d) Let x and...
*October 2, 2013*

**calculus**

Evaluate each of the following. Show all your calculations. f" (1/3) if f(x) = −2x^5 + 2x − 6
*April 17, 2013*

**calculus**

Evaluate each of the following. Show all your calculations. f" (1/3) if f(x) = −2x^5 + 2x − 6
*April 17, 2013*

**calculus**

Evaluate each of the following. Show all your calculations. f" (−3) if f(x) = 4x^3 − 3x^2 + 2x − 6
*April 17, 2013*

**calculus (gr 12)**

Evaluate each of the following. Show all your calculations. f′ (3/4)if f(x) = −3x^3 − 7x^2 + 4x − 11
*April 17, 2013*

**calculus (gr 12)**

Evaluate each of the following. Show all your calculations. f" (1) if f(X) = −3x^2 − 5x + 7
*April 17, 2013*

**calculus (gr 12)**

Evaluate each of the following. Show all your calculations. f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8
*April 17, 2013*

**calculus (gr 12)**

Evaluate each of the following. Show all your calculations. f'(3) if f(x) = x^4 − 3x
*April 17, 2013*

**math**

thanks
*February 15, 2013*

**math**

Disks of radius 4 cm are cut from a rectangular plastic sheet of length 84 cm and width 24 cm. How many complete disks can be cut out? Find (a) the total area of the discs out (b) the area of sheet wasted I did it but the answers on the back of the book do not match heres what...
*February 15, 2013*

**math**

Julia and Bianca both leave the college at the same time, but in opposite directions. If Bianca travels 9 mph faster than Julia and after 4 hours they are 140 miles apart, how fast is each traveling?
*January 14, 2013*

**Calculus**

I have no idea what to do with this problem. Please help me found the basic formula. When Apollo 15 astronaut David Scott dropped a hammer and a feather on the moon to demonstrate that in a vacuum all bodies fall with the same constant acceleration, he dropped them from about ...
*March 11, 2012*

**Physics **

A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.77 m/s2. She decides to test the car by dragging with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 1.04 s before Kathy. If Stan moves ...
*February 2, 2012*

**calculus**

Evaluate the integral from -4 to 4 of [x^3 sin(6x)] / [sin(5x)]dx
*December 10, 2011*

**Math**

If the value of $1 is 1.082431 in one year at 8 % compounded quarterly, what is the effective interest rate? (a)82.4% (b)8% (c)0.824% (d)8.24% (e)824.31%
*November 3, 2011*

**Physics**

Does the KE of a car change more when it accelerates from 27 km/h to 37 km/h or when it accelerates from 37 km/h to 47 km/h? 1. More information is needed. 2. No diﬀerence 3. From 37 km/h to 47 km/h 4. From 27 km/h to 37 km/h
*October 31, 2011*

**English**

Can someone edit this essay? Topic is "if given funding for a small engineering project, what would you do?" 250 word limit Millions of Americans purchase bottled water everyday simply because they don't like the taste of their own tap water. While most Americans...
*October 26, 2011*

**English**

its a college essay, the topic is "discuss your favorite place to get lost." 250 word limit
*October 26, 2011*

**English**

Can someone edit this essay? High school is a menacing, over-bearing world that hardly gives the average student to even stop and think. With the threat of a possible test or project coming up, combined with constant homework, it's easy to forget you're even still a ...
*October 26, 2011*

**Physics**

It's absolutely not answer 1. could it be 3.??
*October 13, 2011*

**Physics**

A car drives up a straight hill at a constant speed of 60 kilometers per hour. A truck drives over the crest of the hill at a constant speed of 60 miles per hour. What is the net force on the car and on the truck? 1. both not zero 2. not zero; zero 3. both zero 4. zero; not zero
*October 13, 2011*

**Physics**

It would either be velocity or speed right? I would assume the weight nor the mass change.
*October 12, 2011*

**Physics**

An object traveling at a constant 20 m/sec in a circular path is changing its 1. velocity. 2. speed. 3. weight. 4. mass.
*October 12, 2011*

**Math**

A turtle crawls up a 12 foot hill after a heavy rainstorm. The turtle crawls 4 feet, but when it stops to rest, it slides back 1 1/2 feet. How many tries does the turtle make before it makes it up the hill?
*October 10, 2011*

**Mathematics**

If a brick weighs exactly as much as a 9-pound rock plus falf of another brick, what does a brick and a half weigh?
*October 9, 2011*

**statistics**

Using the Hypergeometric Rule C_3^10*C_3^(7 )= 10!/3!(10-3)! * 7!/3!(7-3)! = 120(35) = 4200
*October 6, 2011*

**statistics**

6. A geography student needs to take three 300- level and three 400- level geography classes next semester in order to graduate. If there are 10 300- level courses being offered and 7 400- level courses being offered, how many different schedules could the student have?
*October 6, 2011*

**Honors Physics**

I am still confused. For finalvelocity, where did you get 18?
*September 27, 2011*

**Honors Physics**

An automobile accelerates from rest at 1.3 m/s 2 for 19 s. The speed is then held constant for 23 s, after which there is an acceleration of −0.9 m/s 2 until the automobile stops. What total distance was traveled? Answer in units of km
*September 27, 2011*

**Physics**

I need help finding Vfinal. I have Vinitial, acceleration, and distance.
*September 27, 2011*

**Physics**

An automobile accelerates from rest at 1.3 m/s 2 for 19 s. The speed is then held constant for 23 s, after which there is an acceleration of −0.9 m/s 2 until the automobile stops. What total distance was traveled? Answer in units of km
*September 27, 2011*

**Math**

The price of a video system increased by 15% to $1,127.00. What was the price of the system before the increase? (a)$900.80 (b)$908.00 (c)$809.00 (d)$890.00 (e)$980.00 I need help with this problem and to be leaded towards the direction to find the right answer
*September 18, 2011*

**algebra**

can you write an equation for the line with slope 2/3 and y-intercept 5?
*June 10, 2011*

**essay**

So basically what you're saying is if a war breaks out in the country Canada is peacekeeping in, they'll feel obliged to participate?
*May 29, 2011*

**essay**

If anything, I feel that peacekeeping would only agitate other countries of Canada's presence, no?
*May 29, 2011*

**essay**

Thanks for the answer, but a few questions. Why exactly do developed democracies have said responsibility, and how does preventing wars protect Canada?
*May 29, 2011*

**essay**

So I have to write an argumentative essay on Canadians peacekeeping in foreign countries (Cyprus, Rwanda, Somalia, Bosnia, Croatia) and I have to argue whether Canadians should or shouldn't be peacekeeping in foreign countries. I have to have 3 main arguments, but I can&#...
*May 29, 2011*

**algebra2/trignometry**

in right triangle PQR,Q=90DEGREE,PQ=4 AND PR=7 WHAT IS ANGLE R TO THE NEARST TENTH OF A DEGREE
*April 27, 2011*

**To Helper**

Thanks a lot :)
*January 13, 2011*

**To Helper**

I had a problem to solve, and I dont get how to make equations from this problem. Mrs. Chans math class contributed 2 dollars and $1 coins to an earthquake relief fund. the number of $1 coins contributed was 8 less than 5 times the number of $2 coins contributed. if class ...
*January 13, 2011*

**Math ---Helper**

Alright thanks, if you cant find them, just search my name in the searchbox and itll come up, thanks helper:D
*January 13, 2011*

**Math ---Helper**

Helper I really need ur help with some of my math questions down below, ur the best math tutor on here, need ur help please.
*January 13, 2011*

**Necessary Math HELp**

Wow helper:D Thanks a lot buddy, I really appreciate all the time you put to help me with my question. Yeah thanks to your explanation I get it, thanks a lot:) So here's how I substitute right? 2x+y = -5 2(-4)+y = -5 -8 +y = -5 Then I add 8 to both sides and get: y = -3 ...
*January 13, 2011*

**Necessary Math HELp**

2x + y = -5 3x +5y = 3 How come I have to multiply by 5 to make the y variables cancel, like what does that mean? I dont get how ur supposed to multiply like where and how? Im really stuck right now, please help:(
*January 13, 2011*

**Math**

Mrs. Chans math class contributed 2 dollars and $1 coins to an earthquake relief fund. the number of $1 coins contributed was 8 less than 5 times the number of $2 coins contributed. if class raised total of 160 bucks, how many coins of each type was collected? it says i have ...
*January 13, 2011*

**MATHH**

Thanks a lot:D
*January 13, 2011*

**MATHH**

Solve by using elimination: 7x - 2y =3 2x +y = 4 ?????????????????
*January 13, 2011*

**Lines and Slopes Math**

A line is perpendicular to x+3y-4=0 and has the same y-intercept as 2x+5y-20=0. Find an equation for the line
*January 6, 2011*

**Math**

A line is parallel to 5x+2y-8=0 and has the same y-intercept as x+4y-12=0 Find an equation for the line.
*January 6, 2011*

**:)**

Which white person discussed or mentioned in Narrative Life is most important?
*December 6, 2010*

**chemistry**

the most common english unit of mass is the pound avoirdupois. what is one troy pound in kilograms and in pounds?
*September 8, 2010*

**chemistry**

use exponential notation to express the number 480 in 3 significant figures and 4 significant figures
*September 8, 2010*

**chemistry**

oxidation state of nitrogen. no2-
*September 1, 2010*

**chemistry**

oxidation state of nitrogen in n2h4
*September 1, 2010*

**math**

x^4-1/x^3=0
*August 28, 2010*

**math**

sin^-1(sin 7pi/6)
*August 26, 2010*

**math**

3999999999999999990000000000000055555555555555555555555555554459999999999999999999999888
*August 2, 2010*

**language arts**

unscamble the letter to find the name of a mall trrlnematitanaaon
*May 10, 2010*

**cook**

what is the A.S.A cuz i need to find out what it/they do
*April 18, 2010*

**Math**

Two small planes start from the same point and fly in the same direction. The first plane is flying 35 mph slower than the second plane. In 2 hrs, the planes are 530 mi apart. Find the rate of the slow plane.
*February 4, 2010*

**Math**

How would you do it if the planes were goin in the same direction?
*February 3, 2010*

**4th grade math**

50X1=50
*January 7, 2010*

**X**

i am a perscoll and the aswer for 25X25=625
*November 21, 2009*