# Posts by mark

Total # Posts: 1,609

**Physics**

A model rocket is launched upward with an initial speed of 50 m/s. It accelerates with a net constant upward acceleration of 2.0 m/s^2 until its engines stop at an altitude of 150 m. (a) What is the maximum height reached by the rocket? (b) how long after the life-off does the...

*September 24, 2010*

**%**

How do I find a dollar number plus 7.1% that will come close to $70.00 Here is what Im doing..I rent out packages that are $70.00 and I want to pay 7.1% sales tax out of that $70.00..What dollar amount do I use to add 7.1% to, to make it as close to $70.00 as I can…whats ...

*September 22, 2010*

**physics**

A 1.20 block is attached to a spring with spring constant 14.0 . While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 50.0 . What is the amplitude of the subsequent oscillations?

*September 21, 2010*

**physics**

A high diver of mass 50.0 kg jumps off a board 10.0 m above the water. If her downward motion is stopped 1.80 s after she enters the water, what average force did the water exert on her?

*September 21, 2010*

**To Brittany and Ryan**

BUUUUUUURN!!!!

*September 21, 2010*

**physics**

A motorboat whose speed in still water is 3.00 m/s must aim upstream at an angle of 27.0^\circ (with respect to a line perpendicular to the shore) in order to travel directly across the stream. What is the speed of the current?

*September 21, 2010*

**physics**

A diver running 1.8m/s dives out horizontally from the edge of a vertical cliff and 3.0s later reaches the water below. How high was the cliff, and how far from its base did the diver hit the water?

*September 21, 2010*

**calculus**

The height (in feet) of a skydiver at time t (in seconds) after opening his parachute is given by h(t) = 4000 – 19t. Find the skydiver's velocity after the parachute opens. The answer should be in feet per seconds. I would appreciate if somebody helps.... Thank you.

*September 21, 2010*

**6 grade**

I love basketball more than you.

*September 20, 2010*

**Algebra**

How many milimiters of pure acid must be added to 150 milimiters of a 30% solution of acid to obtain a 40% solution? I know that the answer is 25 milileters. Could someone show me with steps how to get the answer.

*September 19, 2010*

**Algebra**

If a computer costs an electronics dealer $300, and she sells them for $800, what is her rate of profit based on the selling price? I know the answer is 62.5% but could someone show me how to get this answer , thanks

*September 19, 2010*

**Biology**

Why are the intestinal lenghts of algae-eating tadpoles and insect-eating adult frogs so different?

*September 17, 2010*

**business**

Please I need help with this question.. What are some controls that companies use to protect their assets?

*September 16, 2010*

**chem**

what is(2.25x10*3)(4.80x10*4)=

*September 14, 2010*

**calculus**

f (4 + h) - f (4) = 4h^2 + 4h (a) What is f '(4)? (b) What is the slope of the secant line through (4, f (4)) and (7, f (7))?

*September 14, 2010*

**Finance**

Royal Cup’s last dividend was $ 1.00 per share and dividends are expected to grow at a rate of 6%. What is the current value of a share of this stock to an investor who requires a 10 percent rate of return?

*September 11, 2010*

**Finance**

Caledonia last paid a dividend of $1 per share 2010. In 2007, the Caledonia paid a dividend of $0.84. This dividend growth rate is expected to be constant for the foreseeable future if the merger is not completed. If the merger is successful, the expected dividend for next ...

*September 11, 2010*

**12th grade - Math**

Justify your answer: 1.) Which line is steeper? y= 4/3x - 5 or y= 6/5x - 1 2.) Does the slope of line AB exist? A (-2,7) B (-2,-1)

*September 9, 2010*

**Finance**

Determine the value of a $500 Canadian Pacific Limited perpetual 8 percent debenture if the required rate of return is 14%

*September 2, 2010*

**college**

lead has density of 11.35g/ml,i have 3.45 cc of lead what is the weight in grams.

*August 31, 2010*

**chm**

The mass of Oceanis 1.8*10 to 21 kg.The ocean contains 1.076%sodium ion,Na+what is mass of sodium in ocean

*August 31, 2010*

**jewelry markings**

I have a ring that appears to be gold plate over silver with the markings COP copyright 89 5. Can you tell me what this means ?

*August 21, 2010*

**Math Probability**

An insurance sales representative selects 3 policies to review. The group of policies she can select from contains 8 life policies, 5 automobile policies, and 2 homeowner policies. Find the probability of selecting” (a) All life policies (b) Both homeowner policies (c) ...

*August 16, 2010*

**childcare**

nope one is C

*August 8, 2010*

**english**

need some oratorical piece please

*July 28, 2010*

**Physics**

Rotational Inertia- Particle 1: m=50g x=2 cm y=2 cm P 2: m=25 x=0 y=4 P 3: m=25 x=-3 y=-3 P 4: m=30 x=-e y=4 The question says to find the rotational inertia of the collection about the x, y, and 7 axis in g/cm^2, then suppose the x axis rotational inertia is A and the y axis ...

*July 27, 2010*

**Physics**

Okay. So first for part b I know the formula I'm going to need is v=wr. That will relate the linear speed to the angular speed and we are given the radius. I'm still a little stuck though on the angular speed. I found the circumference of the wheel to be 10pi cm, and ...

*July 27, 2010*

**Physics**

n early method of measuring the speed of light makes use of a rotating slotted wheel. A beam of light passes through one of the slots at the outside edge of the wheel, travels to a distant mirror, and returns to the wheel just in time to pass through the next slot in the wheel...

*July 27, 2010*

**chemistry**

A voltaic cell is contructed in which a copper wire is placed in a 1.0 M Cu(NO3)2 solution and a strip of gold i placed in a 1.0 M AuNO3 solution. The measured potential of the cell is found to be 1.36V and the copper electrode is negative. The Ered for the Cu2+/Cu half- cell ...

*July 17, 2010*

**chemistry**

How do you determine if a salt is behaving as an acid or base?

*June 28, 2010*

**Maths**

A square has an area of S^2 and a regular hexagon has a perimeter of T. If p is the perimeter of the square and h is a side of the hexagon, then find h+p in terms of S and T.

*June 19, 2010*

**computer science**

Pseudo code: Input a list of employee names and salaries, and determine the mean (average) salary as well as the number of salaries above and below the mean

*June 17, 2010*

**college**

is project management designed to transfer power from the line managers to the project manager?

*June 13, 2010*

**Chemistry**

what is the precipitate formed when benedicts solution reacts with glucose? give the net ionic equation for the reaction.

*June 7, 2010*

**Calculus**

Solve the following initial value problem and determine the interval where the solution exists. dy/dt = 2ty^2 y(0) = y_0 Textbook answer is: When y_0 <> 0, then y = 1/(1/y_0 - t^2). When y_0 = 0, then y = 0 When y_0 > 0, the interval where solution exists is |t| < ...

*June 1, 2010*

**math**

18.5

*May 26, 2010*

**algebra**

Could someone please just basically describe how to solve rational equations? I don't understand them. :(

*May 17, 2010*

**Chemistry**

my ap chem teacher has been absent for the past two weeks and part of the notes her sub gave us to copy says that In the equation HC2H3O2 + H20 <--> C2H3O2(- charge) + H3O(+ charge) HC2H3O2 is an acid H2O is a base C2H3O2(- charge) is the conjugate base and H3O(+ charge...

*May 15, 2010*

**Philosophy**

Which of the following ideas is important in virtue ethics? a) community b) duty c) natural human inclinations d) pleasure is it a???

*May 13, 2010*

**English**

In Homer Odyssey - According to Odysseus what is the cause of the doom he and his men face on the Island of Cicones?

*May 12, 2010*

**Economics**

I'm supposed to use a price index for GDP chart to find the GPD deflator of 1983 how do i do that? To get the chart google nipa bea chart,click the first choice, and select tale 1.1.4

*May 9, 2010*

**Schindler's List Essay**

You also only make mention of the SS, whereas Schindler had to deal with many other people from the German army, like the Gestapo, Members of the Secondary command, and general German army soldiers (Nazis) all of whom are depicted in the film. Also you haven;t made any mention...

*May 8, 2010*

**Schindler's List Essay**

I would probably give it a 20 out of 50. This essay has a few good ideas, but overall contains much spelling and grammatical errors, and is overall poorly structured. By this I mean there are no links or comparisons between ideas, instead they are just tossed in randomly over ...

*May 8, 2010*

**pheonix university**

Please select one of the following thesis statements: 1. America's top corporations are successful for a variety of reasons. 2. Scientists have discovered human remains thought to be more than 2 million years older than Lucy, a skeleton found in Ethiopia. 3. A healthful ...

*May 4, 2010*

**Math**

600,000 - x / 600,000 = .10 solve for x.

*May 1, 2010*

**ecology**

Air pollution impacts us on a global level. What are the implications of global warming?

*April 28, 2010*

**ecology**

Give examples of how humans have increased their food supply and what effects these methods have on the environment overall.

*April 28, 2010*

**English**

What kind of emphatic statement?

*April 27, 2010*

**English**

What is the significance of the exclamation mark at "And 'barn' is only a noun-no verb or subject has entered into the sentence yet!"

*April 27, 2010*

**spanish**

It could be; what jeans?

*April 27, 2010*

**ENGLISH**

1. For surgeon it’s not just wake up at 6:00 am in the morning,take a shower, drink a coffee, eat a toast, get into his car and go to work,than finish at 5:00 pm, go home to his family, eat dinner and have a good sleep. 2. dont’t - correct is don’t 3. lazy - ...

*April 25, 2010*

**chem**

so if theres no ions answer would be ch3oh and h20

*April 24, 2010*

**chem**

so would there be an equation?

*April 24, 2010*

**chem**

In a solution prepared by mixing CH3OH with H2O the major species pesent are 1. a. CH3+, OH, and H2O 2. b. CH3O, H+, and H2O 3. c. CH3OH and H2O 4. d. CH3OH, H+, and OH I know i have to get an equation having trouble doing that!! please help!!

*April 24, 2010*

**Chem**

Balance the chemical equation given below, and determine the number of grams of MgO needed to produce 15.0 g of Fe2O3. _MgO(s)+_Fe(s)->_Fe2O3(s)+_Mg(s) 1. a. 11.4 g 2. b. 3.78 g 3. c. 1.26 g 4. d. 0.0877 g I got equation balanced 3,2,1,3 just having trouble on how to find ...

*April 24, 2010*

**Chem**

Given the following hypothetical reaction: 2 E(g) + F(g) + G(g) products. If the rate law is: Rate = k[E]2[F]-1, what is the overall order of reaction? 1. a. zero 2. b. first 3. c. second 4. d. third

*April 24, 2010*

**Chemistry**

Which element can form more than one kind of monatomic ion? 1. a. Se 2. b. Sn 3. c. S 4. d. Sr

*April 24, 2010*

**math**

justify that15 is the sum of eachrow of a 3X3 magic square using the number 0-9. Find the sume of all the numbers. What is the of eachrow in a 4X4 magic square that uses the numbers 1-16.

*April 22, 2010*

**computer science**

c++ program question write a program that uses a loop to display the characters for each ascii code 32 through 127. display 16 characters on each line with one space between characters in c++

*April 21, 2010*

**Chemistry**

Delta H = 2800 Kj Delta S = -260 J Delta Grxn = 2800-(15+273)(-260/1000) = 2874.88 Non-Spontaneous

*April 20, 2010*

**Langusge Arts**

The

*April 14, 2010*

**statistics please help!**

A total of 8,000 dollars is invested at anunual interest rate of 1%. Find the balance after 1.5 years, if the interest is compounded annually. using A=p(1+r/n)^nt

*April 12, 2010*

**Chem**

Delta H = 2800 Kj Delta S = -260 J Delta Grxn = 2800-(15+273)(-260/1000) = 2874.88 Non-Spontaneous

*April 7, 2010*

**science**

ms.sue would it be compressional i am not really sure could you please tell me if i am right thank you

*April 2, 2010*

**science**

A wave that causes the particles of the medium to vibrate parallel to the direction the wave travels

*April 2, 2010*

**Physical Chemistry**

The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 192 kJ·mol-1 to 72 kJ·mol-1. (a) By what factor does the rate of the reaction increase at 281 K, all other factors being equal? (b) By what...

*April 1, 2010*

**Math**

Find (if possible) the trigonometric function of the quadrant angle. sec 3pi/2 My answer was 0. Am I correct?

*March 30, 2010*

**Math(Please help)**

What is the domain? Use a graphing utility to determine the intervals in which the function is increasing and decreasing and approximate any relative maximum or minimun values of the function. g(x) = 12 Ln x / x My answer was: Domain = (12,0) decreasing = (3,-2) and ...

*March 30, 2010*

**NEED HELP! CHEMISTRY**

Three electrolytic cells containing solutions of CuNO3, Sn(NO3)2, and Fe(NO3)3, respectively, are connected in series. A current of 2.2 A is passed through the cells until 3.10 g of copper has been deposited in the cell. (a) What masses of tin and iron are deposited? found ...

*March 29, 2010*

**Math**

What is the domain? Use a graphing utility to determine the intervals in which the function is increasing and decreasing and approximate any relative maximum or minimun values of the function. g(x) = 12 Ln x / x My answer was: Domain = (12,0) decreasing = (3,-2) and increasing...

*March 29, 2010*

**Physical Chemistry**

Three electrolytic cells containing solutions of CuNO3, Sn(NO3)2, and Fe(NO3)3, respectively, are connected in series. A current of 2.2 A is passed through the cells until 3.10 g of copper has been deposited in the cell. (a) What masses of tin and iron are deposited? tin g ...

*March 29, 2010*

**Physical Chemistry**

i thought you were saying to divide by the 1 equivalent?

*March 29, 2010*

**Physical Chemistry**

so for the 1 equivalent weight of Ag i just divide molar mass 107.87 by 1.009 and get 106.8?? is the 1 equivalent weight in material in grams?

*March 29, 2010*

**Physical Chemistry**

A total charge of 97.4 kC passes through an electrolytic cell. Determine the quantity of substance produced in each of the following cases. (a) the mass (in grams) of silver metal from a silver nitrate solution ?g (b) the volume (in liters at 273 K and 1.00 atm) of chlorine ...

*March 29, 2010*

**Math(Help!!)**

What is the domain? Use a graphing utility to determine the intervals in which the function is increasing and decreasing and approximate any relative maximum or minimun values of the function. g(x) = 12 Ln x / x My answer was: Domain = (12,0) decreasing = (3,-2) and increasing...

*March 29, 2010*

**Math(Please help)**

use the given information to solve the triangle. C= 85 degrees 20' a = 35 c = 50 I know that I have to find A,B,b but I do not know how to do this.

*March 27, 2010*

**Math**

use the given information to solve the triangle. C= 85 degrees 20' a = 35 c = 50 I know that I have to find A,B,b but I do not know how to do this.

*March 27, 2010*

**physics**

A steam turbine operates between hot and cold reservoir temperatures of 538 degrees celcius and 92.1 degrees celcius respectively. If heat is supplied at a rate of 238 MW, what maximum amount of power could the turbine deliver?

*March 27, 2010*

**Math**

thanks!

*March 25, 2010*

**Chemisty/Bio**

Is a environment that is hypoxic or anoxic the same as acidic?? I am a little confused how the two relate to each other?

*March 24, 2010*

**physics**

A pigeon in flight experiences a force of air resistance given approximately by F=bv2, where V is the flight speed and B is a constant. A) In terms of SI units, what are the units for the constant "b"? B) What is the largest possible speed of the pigeon if its ...

*March 23, 2010*

**Math(Correction)**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan Q = 2sqrt6 a) cos Q b) cotQ c) cot(90 degrees - Q) ...

*March 23, 2010*

**Math(Correction)**

Error

*March 23, 2010*

**Math(Correction)**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan = 2sqrt6 a) cos Q b) cotQ c) cot(90 degrees - Q) d...

*March 23, 2010*

**Math(Correction)**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. Sorry for the mistake. They are two separate functions and i need...

*March 23, 2010*

**Math**

Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its cofunction of a complementary angle) to find the indicated trigonometric functions. sec Q = 5 tan = 2sqrt6 a) cos Q b) cotQ c) cot(90 degrees - Q) d...

*March 23, 2010*

**grant preposals**

Distinguish between a project-wide evaluation plan and an objective-oriented evaluation plan.

*March 23, 2010*

**Pre-Cal(Please help)**

Error

*March 23, 2010*

**Pre-Cal (Please help)**

Identify any asymptotes of the graph. y = 1.08^5x I know that there is a horizontal asymptote but I do not know how to find it.

*March 22, 2010*

**Pre-Cal**

Identify any asymptotes of the graph. y = 1.08^5x I know that there is a horizontal asymptote but I do not know how to find it.

*March 22, 2010*

**Pre-Cal**

Identify the following features of the graph of g(x) = (3/2)^x+2 A) Asymptotes B) Intercepts C) Increasing or decreasing Once I graph this on my calculator, how can I find these?

*March 22, 2010*

**Pre-Cal**

Identify the following features of the graph of g(x) = (3/2)^x+2 A) Asymptotes B) Intercepts C) Increasing or decreasing I really do not know how to find these

*March 21, 2010*

**Pre-Cal**

Identify any asymptotes of the graph. y = 1.08^5x

*March 21, 2010*

**Pre-Calculus**

Identify the following features of the graph of g(x) = (3/2)^x+2 A) Asymptotes B) Intercepts C) Increasing or decreasing I really do not know how to find these

*March 21, 2010*

**Pre-Cal**

Find the inverse of the function f(x) = 3^x+2

*March 19, 2010*

**Math**

When graphing two linear equations, what is the significance of the intersection of the two graphs, and if there is no intersection?

*March 18, 2010*

**Chemistry**

So then because the valences are diff on each side that means its a redox reaction?? And so N gained eletrons does that mean it's the NO3 ^-1 that is the oxidizing agent or the N in NH3?? this stuff is tripping me up.....can ou explain it any more for me? sorry...im a ...

*March 18, 2010*

**Chemistry**

I'm having a hard time with Redox and how to figure out which is redox Select all of the reactions that are redox reactions. I) Ca + 2H2O Ca(OH)2 + H2 II) CaO + H2O Ca(OH)2 III) Ca(OH)2 + H3PO4 Ca3(PO4)2 + H2O IV) Cl2 + 2 KBr Br2 + 2 ...

*March 18, 2010*

**Chemistry**

I think these I know how to do ....just want someone to check..still sorta mixed up on the first question. Thanx For the following reaction, what is the correctly balanced reduction half-reaction? Fe(OH)3(s) + Cu(s) → Fe(s) + Cu+(aq) + OH-(aq) A. e- + Fe(OH)3(s) → ...

*March 18, 2010*

**Chemistry**

I'm having a hard time with Redox and how to figure out which is redox Select all of the reactions that are redox reactions. I) Ca + 2H2O Ca(OH)2 + H2 II) CaO + H2O Ca(OH)2 III) Ca(OH)2 + H3PO4 Ca3(PO4)2 + H2O IV) Cl2 + 2 KBr Br2 + 2 KCl...

*March 18, 2010*