Saturday

February 28, 2015

February 28, 2015

Total # Posts: 454

**physics**

How much work is required to lift a 600-kg satellite to an altitude of 4 * 10^6 m above the surface of the earth? The gravitational force is F=GMm/r^2, where M is the mass of earth, m is the mass of the satellite, r is the distance between them. The radius of the earth is 6.4...
*February 11, 2011*

**Math**

Walking down a long moving escalator, Phil covered 75 m in distance in 25 seconds. Walking back up against the motion of the escalator, the distance was covered in 75 seconds. What was the speed of the escalator?
*February 6, 2011*

**statistics**

I have created my chart but am really confused on creating a Hypothesis and how to actually use the information obtained by my chart. The question is about the variance in a production process is an important measure of quality. A lrg var often signals an opportunity for ...
*January 28, 2011*

**english LAC 1**

28. Which of the following sentences contains a shift in tense? (Points : 5) Reading biographies helps you understand how the world works. Once he had finished the book, he will write the report. Sure, it is easy to dye clothes if you know how. The sky was clear and blue, and ...
*January 25, 2011*

**english LAC 1**

11. What kind of complement is the underlined word? Mom, give us a break, just once. (Points : 5) direct object indirect object predicate nominative predicate adjective 12. What kind of complement is the underlined word? Isn't this movie The Black Stallion? (Points : 5) ...
*January 25, 2011*

**math-finance**

Colin borrowed some money at 7.16%?a compounded quarterly. three years later. he paid $5000 toward the principal and the interest. after another two years, he paid another $5000. after another five years, he paid the remainder of the principal and the interest, which totalled...
*January 18, 2011*

**U.S.History**

Why was the Virginia Colony successful?
*January 9, 2011*

**Math**

yes, I think I found the second too. 6(x+1)(2x+1)?
*January 6, 2011*

**Math**

Find the second derivative of x(x+1)^3
*January 6, 2011*

**7th grade math**

6+x=2x-14. I'm not to sure how to solve this type of equation.
*January 6, 2011*

**Trigonometry**

Sketch a height versus time graph of the sinusoidal function that models each situation. draw at lease three cycles. assume that the first point plotted on each graph is at the lowest point: a girl lying on a an air mattress in a wave pool that is 3 m deep, with waves 0.5 m in...
*January 1, 2011*

**Math**

Suppose you invest $600 at an annual interest rate of 3.9% compounded continuously. How much will you have in the account after 25 years?
*December 24, 2010*

**Grade 11 math - HELP!**

Skyscrapers sway in high-wind conditions. in one case, at t=2s, the top floor swayed 30cm to the left (-30cm), and at t=12, the top floor swayed 30 cm to the right (+30cm) of its starting position. a) what is the equation of a sinusoidal function that describes the motion of ...
*December 21, 2010*

**Grade 11 math - HELP!**

Thank youu !
*December 12, 2010*

**Grade 11 math - HELP!**

The diameter of a car's tire is 52 cm. While the car is being driven, the tire picks up a nail. How high above the ground will the nail be after the car has travelled 0.1 km? can someone please explain how to solve this question?
*December 12, 2010*

**Math**

Thank you I found that at 0.213 of a cycle the distance travelled would be 34.8 cm in terms of the first cycle. And I found the height at that distance to be 22.15 cm Is that correct?
*December 12, 2010*

**Math**

The diameter of a car's tire is 52 cm. While the car is being driven, the tire picks up a nail. How high above the ground will the nail be after the car has travelled 0.1 km? It also asked me to graph this information. So I created a periodic graph that starts at 0 and ...
*December 12, 2010*

**Math**

Thank you so much!
*December 11, 2010*

**Math**

i don't think this is a cycloid because i'm only in grade 11 math and have never heard that term before this is from the "periodic function and their properties" unit so, is it possible to give me an answer related to that? thank you
*December 11, 2010*

**Math**

maria's bicycle has a diameter of 64 cm. as she rides at the speed of 21.6 km/h, she picks up a stone in her tire. draw a graph that shows the stone's height above the ground as she continues to ride at this speed for 2 s more. can someone please help me find the ...
*December 11, 2010*

**Chemistry**

What happens to the sample's reported water content if the salt decomposes yielding a volatile product? If the water is not completely removed from the salt during the heating process, will the reported water-to-salt mole ratio be high or low? Explain
*December 6, 2010*

**Chemistry**

If some volatile impurities in the crucible are removed from the hydrated MgSO4 along with the water, is the reported mass of water removed too high or too low. Explain.
*December 6, 2010*

**chemistry**

Enthalpy and Entropy in Reactions and Solutions Introduction In the course of most physical processes and chemical reactions there is a change in energy. In chemistry what is normally measured is H (enthalpy change), the change in heat at constant pressure and ignoring any ...
*November 30, 2010*

**phsyics**

The 3.0cm-diameter water line in the figure splits into two 1.0cm -diameter pipes. All pipes are circular and at the same elevation. At point A, the water speed is 2.0 m/s and the gauge pressure is 50 kPa. What is the gauge pressure at point B. I keep getting an answer that I ...
*November 15, 2010*

**Calculus**

Is it (0,0), (2,0) and (-2,0)?
*November 11, 2010*

**Calculus**

What are the coordinates of the points at which the slope of a function with the equation y=x^4-8x^2 is equal to zero? Please help me to understand how to approach this question.
*November 11, 2010*

**English**

"It" refers to gardening. Fransisco is telling his Grandpa that gardening is easy.
*November 8, 2010*

**tourism**

which aTourism gencies in Jamaica govern
*November 5, 2010*

**Chemistrty Help**

Calculate the wavelength of each of the following frequencies of electromagnetic radiation. 1040 kHz} (typical frequency for AM radio broadcasting) (assume four significant figures) in METERS? Can someone help me?
*October 29, 2010*

**Chem Help URGENT**

thank you so much
*October 28, 2010*

**Chem Help URGENT**

Could someone help me with these molecular formulas, i dont know what im doing wrong. For this example, i did it like this and it says its incorrect. Could you solve the the equations below your way and i match it to mines? Thank you so much Fe (s) + Ni(NO3)2 (aq) =Fe(NO3)2 (...
*October 28, 2010*

**history- political science**

Hi everyone =D thanks in advance to those who helped me. I am in need of a format or outline of some kind to help me write my 5-6 page term paper that is based on three books comparing and contrasting the themes within all three of their historic concerns on/of immigration ...
*October 23, 2010*

**American Government**

This is an old question, but for anyone cruising by looking for help, assuming we are using the same text book, you can refer to Chapter 3. The answer is pretty much right in front of you; you just have to write the paragraphs! Hope this helped. Good luck!
*October 22, 2010*

**Physics**

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 63.0° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 22.0 m away. By how much does the rocket clear the top of the wall?
*October 13, 2010*

**PHYSICS**

The blade of a windshield wiper moves through an angle of 90.0° in 0.49 s. The tip of the blade moves on the arc of a circle that has a radius of 0.6 m. What is the magnitude of the centripetal acceleration of the tip of the blade?
*October 5, 2010*

**PHYSICS**

A satellite is placed in orbit 6.30*10^5 m above the surface of the planet Jupiter. Jupiter has a mass of 1.90 1027 kg and a radius of 7.14*10.7 m. Find the orbital speed of the satellite.
*October 5, 2010*

**Math 3**

1700 3,500 1,600 7,400
*September 17, 2010*

**Math**

principle= rate x time p=rt $69.64=7.5% x t solve for t
*August 19, 2010*

**English/ Writing**

I have to persuade my teacher in an essay that a dog is an apple or that an apple is a dog. I can't think of any ways that a dog is like an apple and visa versa. Help!
*August 18, 2010*

**AP Biology**

^^ Thanks, Bobpursley.
*August 2, 2010*

**AP Biology**

It's alright... But could you at least mention that it's just a guess before you end up giving me a C+ in Biology..!
*August 2, 2010*

**AP Biology**

I am, but none of them are giving me the information I need. I researched them all for hours only to come out empty-handed.
*August 2, 2010*

**AP Biology**

You were wrong... It's not A.
*August 2, 2010*

**AP Biology**

Thanks, Ariyonia! :)
*August 2, 2010*

**AP Biology**

They type of learning that is involved in predator/prey interactions where an alteration in behavior is a response to stimulus is called A. Habituation Learning B. Cognitive learning C. Instinctive Learning D. Associative Learning E. Non-associative Learning I believe it can ...
*August 2, 2010*

**AP Biology**

What is not dependent on sunlight as a source of energy? A. Benthic Zone B. Pelagic Zone C. Neritic Zone D. Taiga E. Tundra I think it's A, B, or C. Is it?
*August 2, 2010*

**chemistry**

calculate the heat required to raise the temperature of 1.00 L of water from 17.0 degrees celcius to the boiling point
*July 13, 2010*

**Math**

The bases of a trapezoid are 24 and 33 inches long and it encloses an area of 571. Without determining the height of the trapezoid find the areas of the triangular regions into which the diagonals divide the quadrilateral?
*May 29, 2010*

**algebra**

An ostrich can run 174 feet in 3 seconds.
*May 27, 2010*

**algebra 2 / trig**

what is the square root of negative 150?
*May 24, 2010*

**WH**

Who traded coffee between 600-1450?
*April 28, 2010*

**English**

In the Great Gatsby, Why does Nick say that reserving judgements "is a matter of infinite hope?" in the opening chapter?
*April 27, 2010*

**French**

What word is NORCETMAIN unscrambled in French?
*April 14, 2010*

**city college**

discuss the cultural versus evolutionary explanations for gender differences in aggressiveness.
*April 10, 2010*

**micro economics**

Another business may make far more money on this land than the motel can make. Another aspect to consider is the motels property tax may go up far more that the motel can support. They need to look and see if how much their profit is and see how much the land could sell for in...
*April 7, 2010*

**Chemistry**

If the temperature of a confined gas is doubled at constant pressure, what change is observed? A) The volume of the gas is decreased to 1/4 of its original value. B) The volume of the gas is increased to twice its original value. C) The density of the gas is doubled. D) The ...
*March 29, 2010*

**AP Chemistry**

For c it is both the Ka for BH^+ and concentration of BH^+ to determine pH at the equivalence point.
*March 8, 2010*

**Corporate Finance**

Depreciation for the first year = 33% of equipments= 21450 Sales 60000 Less Operating costs 25000 Less Depreciation 21450 Profit before taxes 13550 Less taxes 4743 Profit after taxes 8808 Add Depreciation 21450 Cash flow after taxes 30258
*March 1, 2010*

**math**

No that is wrong. The probability when rolling a 6 sided cube and landing on one number is what you are trying to figure out. Since you role a cube, you only have the ability to land on one number at a time. The question is what is the probability of landing on a 4...So... try...
*January 29, 2010*

**math**

Add all of them together like you were doing... 2+4+4=10 Then make fractions of the amount for each colored sock in relation to the total... Blue Pair Probability: 2/10 --simplified... 1/5 WhitePair: 4/10 Simplified... 2/5 And so on...
*January 29, 2010*

**SS**

Will the world truly end in 2012 or is this just an absurd myth? I have heard arguments for both sides...but what is the truth.
*January 29, 2010*

**social studies**

I'm about to sign up for classes and am wondering...what are microeconomics and macroeconomics and what are the differences between the two?? THANKS!
*January 25, 2010*

**college**

if you take a $1000.00 and add 6% over 48 years how much would you have
*January 24, 2010*

**Chemistry**

im sorry i dont understand could you please go into a little more detail.. i broke it up into NaC7H4ClO2 --> Na+ and C7H4ClO2 then did C7H4ClO2 + H2O --> ?
*January 21, 2010*

**Chemistry**

If you have 0.2 M of NaC7H4ClO2 with a pH of 8.65, what is the pH of 0.2 M of HC7H4ClO2?
*January 21, 2010*

**Pre-calc**

How do you find the range of a projectile?
*January 4, 2010*

**math**

All you have to do is divide by three
*December 9, 2009*

**10th grade algebra **

the volume of a pyramid with a rectangular base is v=1/3LWH. find W if V=500 L=15 and H=4. a) W=25 b) W=20 c) W=18 d) W=15
*November 17, 2009*

**Algebra**

Find domain and range of each. {(-1,2) (0,2) (1,3) (2,2)} Domain: {-1,0,1,2} Range: {2,3} {(1,5) (2,9) (3,9)} Domain: {1,2,3} Range: {5,9} {(1,2) (1,5) (3,7)} Domain: {1,3} Range: {2,5,7} Are these all right?
*November 13, 2009*

**Physics**

I just did this problem for an assignment and used sin not tan. Otherwise I agree.
*November 12, 2009*

**chemistry**

i still dont get my question. I dont understand how to set it up
*November 10, 2009*

**Chemistry**

CH4+Cl2->CH2Cl2+HCl. If 6.00 g of CH4 are mixed with 6.00 g of CL2, how much HCl can be made? What is the percent yield if 2.5 g are recovered from the reaction in the lab?
*November 10, 2009*

**12th grade Physics**

Determine the x and y components if a dog walks to the park that is 24m, 30 degrees northwest. Please help i don't know how to go about solving this problem
*November 4, 2009*

**algebra 2**

x+y>4 will turn into y>-x+4 you will graph it like it says = instead of > and shade above the line. x-y<7 will turn into y>x-7. Graph like there is an = and shade above the line with a different color. Where the colors overlap will be the answer>
*November 4, 2009*

**maths ( mental ability)**

2/3 of 9 is 6
*November 2, 2009*

**Physics**

Traveling at a speed of 16.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.72. How much time does it take for the car to come to a stop? Ignore air resistance.
*October 22, 2009*

**Physics**

An 81 kg baseball player slides into second base. The coefficiant of kintetic friction between the player and the ground is 0.49. a) What is the magnitude of the frictional force? b) If the player comes to rest at 1.6 s, what was his intial velocity?
*October 22, 2009*

**Math**

Four girls bought a boat for $60.00. the first girl paid-one half the sum of the amounts paid by the other 3. The second girl paid one-third the sum of the amounts paid by the other 3. The third girl paid one-fourth the sum of the amounts paid by the other 3. How much did the ...
*October 4, 2009*

**MATH ??**

I looked at a 1938, 39 & 40 calender and they are all still on the same day. What am I missing thanks for your help
*October 4, 2009*

**physics**

The centers of a 11 kg lead ball and a 70 g lead ball are separated by 8.0 cm. What gravitational force does each exert on the other?
*September 29, 2009*

**calculus**

I have a couple of questions that I'm not sure how to do! 1) Given f(x) = (x^2 - 2x + 1) for x does not equal 1 and (k) for x = 1 Determine the value of k for which f is continuous for all real x. a) 0 b) 1 c)2 d)3 e)none of the above i think the anser is a but i'm ...
*September 24, 2009*

**Chemistry Octane Combustion**

YOUR MOM
*September 15, 2009*

**Math**

thank you
*September 9, 2009*

**Math**

Write 8/25 in Decimal (use the prime factorization of the denominator and explain if it repeats or terminates).
*September 9, 2009*

**math**

32/(4+4)* 2 to the third power-7=
*September 9, 2009*

**science**

A diesel engine's piston compress 16cm3rd of fuel air mixture into 1cm3 The pressure changes from a atmosphere to 48 atmospheres if the initial temp. of the gas was 305k What was the final temerature
*August 4, 2009*

**business**

What is the impact of computer graphics on the research report writing format?
*June 17, 2009*

**hum 130**

Is indigenous religion in australia still practiced today?
*June 2, 2009*

**Science**

Is heat transferred from a cool surface to a warm one or is it vice versa? Thanks
*May 30, 2009*

**com/220**

how do I quote a source from the library
*May 24, 2009*

**algebra**

the length of a rectangle is twice the width. The area is 200yd^2. Find the length and the width.
*May 3, 2009*

**science**

Amino acids that you obtain from eating foods are classified as A. essential. C. extracellular. B. facilitated. D. inorganic. A - is this correct
*March 25, 2009*

**math**

Im sorry the questino sould actually be deermine it algerbraically. 2^x+1-8=5^(1/3x) Please help me, I have tried so many times to get the rght answer and I can't.
*March 15, 2009*

**math**

Determine the value graphically. 2^x+1-8=5^(1/3x)
*March 15, 2009*

**English**

For English class, we're doing a vocab. review for seventh graders, as part of our teaching project. Should seventh graders know what inevitable means? What age should people know that word by? Thank you.
*March 15, 2009*

**math**

3 2/3*2 7/8
*March 2, 2009*

**precalculus**

(cos^4ө- sin^4ө/ cos^2ө)+ tan^2ө = {(cos^2ө-sin^2ө)(cos^2ө+sin^2ө)/cos^2ө}+tan^2ө = 1{(cos^2ө-sin^2ө)/cos^2ө}+tan^2ө =?
*February 22, 2009*

**precalculus**

I dont understand this problem: (Tanө + cos ө)/ (sec ө + cot ө) so I start off like this: ={(sinө / cos ө)+cosө}{cos ө + (sinө/cosө)} =[(sin ө +cos^2ө) (cos^2ө +sin ө)]/ cos ө but what ...
*February 22, 2009*

**the language of healthcare**

Describe the following approaches used to organize information about the body. Also provide an example for how each approach is used. Body planes and directions Body Cavities Quadrant and regions Anatomy and physiology Microscopic-to-macroscopic Body systems Medical speciality
*February 5, 2009*

**geometry**

what does it mean when the scale factor (ratio) of the actual object to its model is less than 1? ; greater than 1?
*December 3, 2008*

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