# Posts by Jack

Total # Posts: 1,757

**History Please Please**

Could you please explain to me: how was the structure (Collosus of Rhodes) effective for it's stated purpose? I don't understand the question and I need something for my project. Pleaseee.

*October 23, 2011*

**Physics**

The Earth's rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2006 the Earth took about .840 s longer to complete 365 revolutions than it did in the year 1906. What was the average acceleration of the Earth during this time? ...

*October 23, 2011*

**physicsURGENT**

An 85 cm long pendulum with a 0.80 kg bob is released from rest at an initial angle of θ0 with the vertical. At the bottom of the swing, the speed of the bob is 2.8 m/s. What angle does the pendulum make with the vertical when the speed of the bob is 1.4 m/s?

*October 23, 2011*

**math**

A set of 100 open lockers are numbered from 1 - 100. Sarah comes by and closes all the lockers with even numbers. Then Sarah walks past the lockers again and checks the ones numbered with multiples of 3. If the locker is closed, she opens it; if it is open, she closes it. She ...

*October 23, 2011*

**History**

Colossus of Rhodes: Was the structure effective for its' stated purpose?

*October 22, 2011*

**Math**

thank you very much

*October 20, 2011*

**Math**

A computer game starts with a set of 144 tiles separated into 36 equal groups.Sara played the game until there were 8 groups of tiles left.How many tiles were left when Sara finished? How do you get 32 tiles?Can you please explain?Thanks

*October 20, 2011*

**Math**

240 / 6= 40 in both teams. So I don't know how to explain this problem to the teacher because I have to justify my answer. Please help me. Thanks

*October 20, 2011*

**Math**

A computer game starts with a set of 144 tiles separated into 36 equal groups.Sara played the game until there were 8 groups of tiles left.How many tiles were left when Sara finished?

*October 20, 2011*

**math**

I Wanted To Find The Square Root Of (1-2i) But I Didn't Know How To Solve It. My Solution : x+yi = sqr(1-2i) x2-y2+2xyi = 1- 2i x2-y2 = 1 2xy = -2 y = - 1/x x2 - (-1/x) = 1 ] * x2 x4-x2-1 = 0 How To Evaluated (x4-x2-1) ? I Tried To Sol

*October 16, 2011*

**Calculus**

thanks Damon, in HS and this is kicking my butt!

*October 14, 2011*

**Calculus**

equation of tangent line of the function sqrt (3x+5) where x=10

*October 14, 2011*

**calculus**

A trough is 16 ft long and its ends have the shape of isosceles triangles that are 5 ft across at the top and have a height of 1 ft. If the trough is being filled with water at a rate of 11 ft3/min, how fast is the water level rising when the water is 7 inches deep?

*October 13, 2011*

**Physics**

35=a 7.94=t

*October 7, 2011*

**Math**

I Don't Know What Is This Subject Called In English But It's About Complex Numbers it says 25 = 16 - 9 i^2 = (4 ± 3i) But My Teacher Says 25 = 25 - 0 i^2 = (5 ± 0i) I Think My Teacher Is Wrong , The Result Is 25 But There Will Not Be Complex Number ...

*October 5, 2011*

**Calculus**

yeah that's what I meant

*October 4, 2011*

**Calculus**

If f(x)=[x−1/(1+5 x)], there are two points on the graph of y=f(x) at which the tangent lines are parallel to the line x−2y=2. Type in the x values of these points. Type the smaller number first, then the larger number.

*October 4, 2011*

**U.S HISTORY**

thanks but i still didn't find the answer

*September 28, 2011*

**U.S HISTORY**

What was Benjamin franklins reaction to the colonies refusal to accept the Albany plan of union?

*September 28, 2011*

**U.S HISTORY**

then do it

*September 28, 2011*

**U.S HISTORY**

LIST TWO REASONS THE FRENCH FELT THREATENED BY BRITISH INTEREST IN THE OHIO RIVER VALLEY?

*September 28, 2011*

**U.S HISTORY**

THANKS, SO WHAT IS THE ANSWER. I REALLY NEED IT NOW FOR MY HOMEWORK :)

*September 28, 2011*

**U.S HISTORY**

WHY DID COLONISTS CONSIDER GEORGE WASHINGTON A HERO, EVEN AFTER HE WAS DEFEATED BY THE FRENCH? PLEASE ANSWER IT THANKS JACK

*September 28, 2011*

**islamic studies**

it was actually my friend that asked the question not me so i put his name

*September 28, 2011*

**islamic studies**

THANKS FOR HELPING ME.

*September 28, 2011*

**math**

is 0 a multiple of every number?

*September 26, 2011*

**Math PLEASE HELP**

what is the sequence for fibbinachi higher than 1,000,000?

*September 26, 2011*

**algebra**

#1 I would do (11*0.6)+(11*5) #2 (3*0.4)+(3*0.5) Figure out the rest!

*September 26, 2011*

**Chemistry**

1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...

*September 26, 2011*

**English**

what is the rhetorical strategy used in this parapgraph and what is the effect/function. Please quote the sentence of where the rhetorical strategy is used. Paragraph: But for the rest of us, the sovereign freedom of traveling comes from the fact that it whirls you around and ...

*September 25, 2011*

**chemistry**

Please explain me which solution reacts faster to breakdown the materials the 25% or 10% HCL?

*September 25, 2011*

**statistics**

what sampling technique is used if a quality-control inspector selected every 20th DVD player as it came off an assembly line

*September 25, 2011*

**Chemistry**

1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent. 2. In ...

*September 23, 2011*

**math**

What Is The Integration Of (0)?

*September 22, 2011*

**chemistry**

Consider the following unbalanced reaction: Fe2O3 (s) + CO (g) --> Fe (s) + CO2 (g) How many moles of carbon dioxide are produced per mole of iron (III) oxide reacted.

*September 20, 2011*

**Physics**

A particle travels to the right at a constant rate of 6.8 m/s. It suddenly is given a vertical acceleration of 1.8 m/s2 for 5 s. What is its direction of travel after the acceleration with respect to the horizontal? Answer between −180◦ and +180◦ and What is ...

*September 18, 2011*

**physics**

A compact disc spins at 2.3 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 3.5 cm from the CD's center. What is the coefficient of friction between the ant and the CD?

*September 16, 2011*

**Networking**

.032%

*September 13, 2011*

**phy**

regarding #5: That answer would be correct if both balls were thrown at the same time. The problem states the red ball was thrown downward 2.6 seconds after the blue ball was thrown. One solution is to determine the position and velocity of the blue ball at the time the red ...

*September 13, 2011*

**physics**

Convert 25 meters to centimeters and gigameters.

*September 12, 2011*

**Physics**

Convert 25 meters to centimeters and gigameters.

*September 12, 2011*

**Physics**

Convert 25 meters to centimeters and gigameters.

*September 12, 2011*

**chemistry**

how do you calculate density of a substance with a mass of 100g and a volume of 48ml

*September 11, 2011*

**maths**

What are the steps to solve it? lim (x^2+y^2)/(sqrt(x^2+y^2+36)-6) as (x,y) approaches (0,0)

*September 10, 2011*

**physics**

A canoe has velocity of 0.40m/s southwest relative to earth.the canoe is on a river that is flowing 0.50m/s east relative to earth find the velocity (magnitude and direction) of the canoe relative to the river.

*September 10, 2011*

**physics**

plz anyway help me for the solution of this question. from the top of a tower P,a ball is thrown vertically upwards.when the ball reaches a distance h below P,its speed is double of what it was at height h above P.show that the greatest height attained by the ball above P is ...

*September 10, 2011*

**physics**

a roller whose diamater is 1.0m.weight 360N.what horizontal force is necessary to pull the roller over a brick 0.1m,heigh when the force is applied at the centre?

*September 10, 2011*

**Math**

place decimal points in 190563 and 865 so that their difference is 181.913

*September 7, 2011*

**PreCal**

Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth.

*September 5, 2011*

**PreCal**

Thank YOU!!!

*September 3, 2011*

**PreCal**

A surveyor records the polar coordinates of the location of a landmark as (40, 62°). What are the rectangular coordinates? Round each coordinate to the nearest hundredth.

*September 3, 2011*

**geometry**

find the variable and LN if M is between L and N LM=8a,MN= 7a,LM=56

*August 30, 2011*

**math**

How Can I Find The Value Of (10 ^ -0.1) (Without Using Calculator)

*August 28, 2011*

**maths**

270

*August 27, 2011*

**Geometry**

A company produces cardboard boxes with the top, bottom and sides measuring 5 feet. It costs the company 4 cents a square foot to make each box. The square footage is determined by finding the area of all six sides of the box. Find the cost to make 100 boxes.

*August 27, 2011*

**Physics**

A roller coaster moves 85m at 35 degrees S of W, and then travels 30 m at 45 degrees W of N. What is its displacement from its starting point?

*August 24, 2011*

**Approximation**

Find The Value Of (Sin 31) Using Approximation ?

*August 22, 2011*

**math**

A Glass Of Water Is Being Filled With Water At The Rate Of 12 Pi Cm^3/sec And the radius of the top is 6 cm and the radius of the base is 3 cm and the height of the glass is 12 cm , find A) dh/dt and B) radius when the height of water is half?

*August 11, 2011*

**Trig**

Find [4(cos115+isin115)]^6

*July 25, 2011*

**English Grammar**

Hello

*July 10, 2011*

**Algebra**

4x+2y-3z=7 2x+4y+z=35 6x+2y-2z=20 solve the system

*June 19, 2011*

**geometry**

look at the right triangular prism. Which side is perpendicular to edge ce at point e?

*June 13, 2011*

**english**

Identify the complete Adjective clause The car i drive has 50,000 miles on the odometer. i need to find the Adjective clause in this sentence, Thanks, Jack

*June 9, 2011*

**Chemistry**

A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:

*June 7, 2011*

**algebra**

Could somebody tell me in simple terms why equating coefficients works in partial fraction decomposition? Like a simplified proof or something? I don't understand why.

*June 6, 2011*

**computer science**

which job titles are consistent only with the java language?

*May 26, 2011*

**math**

Two trains leave a train station at the same time. One travels east at 10 miles per hour. The other train travels west at 9 miles per hour. In how many hours will the two trains be 85.5 miles apart

*May 24, 2011*

**writing**

What is the facts and figures that define the problem(cause)

*May 20, 2011*

**math**

Find all the points having an x-coordinate of 9 whose distance from the point (3, -2) is 10. (9, 6), (9, -10) (9, 13), (9, -7) (9, -12), (9, 8) (9, 2), (9, -4)

*May 18, 2011*

**math**

If (3, b) is a point on the graph of 3x - 2y = 17, what is b? -4 4 11/3 23/3

*May 18, 2011*

**math**

find the slope: (-2,-2) (3,6)

*May 18, 2011*

**math**

In his algebra class, Rob has scores of 79, 85, 81, and 65 on his first four tests. To get a grade of C, the average of the first five tests must be greater than or equal to 70 and less than 80. Solve an inequality to find the range of scores that Rob can earn on the fifth ...

*May 18, 2011*

**Algebra**

0.92

*May 15, 2011*

**res342**

I need to know what the correct anwser is a or b or c or d

*May 14, 2011*

**res342**

In conducting research that looks at differences in populations, samples are used for numerous reasons. Using entire populations in a test is difficult, so various sampling techniques are applied. In situations in which the population variance is unknown, the Student t ...

*May 14, 2011*

**Number sence**

lol "Kamilah" you truly are an idiot... sorry i felt utterly compelled to say it.

*May 11, 2011*

**biology**

hi thanks but these sites are not answering my questions.

*May 7, 2011*

**biology**

14 points Save A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced and analyses the Carbon ...

*May 7, 2011*

**science - biology**

A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced and analyses the Carbon present. She ...

*May 7, 2011*

**math**

There are 4 seats in each row of a bus except the last row, which has 5 seats. The total number of seats can be written as 5 + r x 4. Determine the number of seats in a bus for each value of r.

*May 4, 2011*

**Physics**

What is the importance of the Michelson-Morley experiment?

*May 3, 2011*

**Science**

Address is img291.imageshack.us/i/sc017942e5.jpg/

*May 3, 2011*

**Science**

The drawing bellow(click go to address img291.imageshack.us/i/sc017942e5.jpg/ to see picture of image) shows two students performing an experiment. Make a list of the things the students are doing incorrectly

*May 3, 2011*

**physics**

360Hz + 2Hz= 362Hz 360Hz - 2Hz = 358Hz 355 + 3Hz= 358Hz 355 - 3Hz= 352Hz Thus, 358Hz is the answer.

*May 2, 2011*

**Physics**

an object that is 6 cm in height is put 9 cm from a convex lens. The lens has a focal length of 8 cm. What is the size of the image?

*April 26, 2011*

**math**

if anna drew a circle that has an area of 153.86 square meters what is the radius of anna's circle

*April 26, 2011*

**literature**

in at least 4 sentences, compare and contrast the literary elements in the autobiographies of frederick douglass (my bondage and my freedom) and benjamin franlin

*April 19, 2011*

**physics**

an electric motor lifts on elevator 9 m in 15s by exerting an upward force of 1.2 x 10^4 calculate the power

*April 18, 2011*

**Algebra**

For how many two-digit prime numbers is the sum of its digits 8?

*April 14, 2011*

**physics**

Two charges are located along the x-axis. One has a charge of 6.2 µC, and the second has a charge of −3.1 µC. The Coulomb constant is ke = 8.98755 × 10 9 N m2 /C 2 The acceleration of . gravity is 9.81 m/s 2 . If the electrical potential energy ...

*April 11, 2011*

**math**

The n th term (Un) of a progression geometric is given by the formula 2(1.1)^n. Find the least value of n such that Un ≥ n

*April 11, 2011*

**uniform motion science**

How would you set up the following unifor motion problem... How long will it take the plane to fly 1000 km (i mile=1.61 km) if it is traveling at a constant velocity of 80 km/hr.

*April 10, 2011*

**Science**

How would you set up the following unifor motion problem... How long will it take the plane to fly 1000 km (i mile=1.61 km) if it is traveling at a constant velocity of 80 km/hr.

*April 9, 2011*

**Algebra**

what is the positive difference in the sums of the letters in the words MATH and COUNTS, if each letter is assigned a value as follows: A=1, B=-2, C=3, D=-4, ..., Y=25, Z=-26?

*April 2, 2011*

**Algebra**

A 5 digit positive integer is a "mountain number" if the first 3 digits are in ascending order and the last 3 digits are in descending order. For example, 35 761 is a mountain number, but 32 323 and 35 655 are not. How many 5 digit numbers greater than 70 000 are ...

*April 2, 2011*

**math**

Double my tens digit to get my ones digit. Double me and I am less than fifty.

*March 28, 2011*

**math**

If you multiply me by 2, I become a number greater than 20 and less than 40. If you multiply me by 6,I end in 8. If you multiply me by 4 I end in 2.

*March 28, 2011*

**math**

I am less than 100. The sum of my didgits is 4. Half of me is an odd number.

*March 28, 2011*

**Chemistry**

Quicklime (CaO) can be prepared by roasting limestone (CaCO3) according to the reaction CaCO3(s) −!CaO(s) + CO2(g) . When 2.6 ×10^3 g of CaCO3 are heated, the actual yield of CaO is 1.06 ×10^3 g. What is the percent yield? Answer in units of %.

*March 23, 2011*

**Chemistry**

When 2.6 ×103 g of CaCO3 are heated, the actual yield of CaO is 1.06 ×103 g. What is the percent yield? Answer in units of %.

*March 23, 2011*