Wednesday
September 17, 2014

Posts by paul


Total # Posts: 750

Physics
Calculate the energy needed to accelerate a spaceship of mass 10,000 kg to a speed of 0.3c for intergalactic space exploration. Compare with the projected energy usage of the Earth in a decade~10^22J? well i don't know how to start the problem
September 14, 2014

algerbra
The participants in a weight-loss class lost the following weights (in pounds) after three weeks of dieting: 1,5,2,1,3,6 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal places...
August 27, 2014

Chemistry
A 2.00g sample of Fe3O4 is reacted with with 8.00g of O2 to produce Fe2O3. a) What mass of Fe2O3 will be produced? b) What mass of Fe2O3 will actually be produced if the percentage yield for reaction is 85% produced?
August 12, 2014

algebra
P=2L+2W;L=68,W=84
August 1, 2014

algebra
The sum of two page numbers on facing page of a book is 81. What are the page numbers
August 1, 2014

mathematics
125,454 dollars take 30% how much is left
July 29, 2014

PSY/410
Thanks Ms. Sue
July 9, 2014

PSY/410
Will someone please check my answer please. Thanks in advance. Match the definitions to the correct theoretical model. 1. ___J__ Experiences as a child affect life. Child is influenced by caretaker but also has a part in development. 2. __F___ 2–3 years of age and the ...
July 9, 2014

PSY/410
Thanks Ms. Sue
July 9, 2014

PSY/410
I need help finding information to this question please. I found some information on Modern Psychology but not Abnormal Psychology. Thanks in advance. Create a timeline that displays the development of abnormal psychology. Include at least five to seven main milestones.
July 9, 2014

Chemic
so how much sulphuric acid ml need and how much water?
July 8, 2014

Chemic
Hello could you help me answer to one question please. From 98% Sulphuric acid to make 50ml 5% sulphuric acid How to DIlute with water , how much need ?
July 8, 2014

Psy/405
I need help locating information for these questions please. Describe the differences between dispositional and evolutionary or biological personality theories. Discuss the strengths and limitations of dispositional and evolutionary or biological personality theories as they ...
June 24, 2014

English please help me
Please help me to correct my English grammar. thank you. June 17, 2014 Dear sir, Good day, I regret when I resigned from your company but it’s my family’s reason. I am now presently working here in Maldives as a professional photographer and salesman as well. I ...
June 17, 2014

PSY/405
Hello, I need help finding information for my PowerPoint Presentation. Thanks in advance Create a 10- to 12-slide Microsoft® PowerPoint® presentation, including detailed speaker notes,on traditional and contemporary psychodynamic theories. Include the following for ...
June 10, 2014

math
Hello there, im doing an equation and its mind boggling me badly so i want to see if im doing something wrong or not. It goes like this: sinx - Squareroot of 3/2 > 0 x € [0,2pi) i start by moving the sqroot of 3.. so i have sinx >sq3/2. as of that my resaults are 1,...
April 29, 2014

Science
the force you would need to accelerate an object with high mass quickly is the biggest one.
April 29, 2014

Physics
thank you very much ! i got it half the way but couldnt figure out how to finish it .
March 31, 2014

Physics
A steel ball hangs in a 147cm thread which is dragged right and then let go. Velocityh of the ball is 2,44m/s when it goes through the middle position. I dont have any mass given up. How many degrees to the side had the ball been dragged?
March 31, 2014

Physics
In a cyclotron (one type of particle accelerator), a deuteron (of mass 2.00 u) reaches a final speed of 10.1% of the speed of light while moving in a circular path of radius 0.540 m. What magnitude of magnetic force is required to maintain the deuteron in a circular path?
March 27, 2014

math
450 divide 14?
March 27, 2014

Math
Write the multiples of 7 through 70:
March 27, 2014

6th Grade Math
A drawer contains 3 blue ribbons, 4 red ribbons, and 3 green ribbons. A ribbon is randomly chosen from the drawer, replaced, and another ribbon is chosen. Find each probability"
March 26, 2014

math
Hoe do you do 450 divide14?
March 25, 2014

Physics
Ten cars at an intersection are blowing their horns simultaneously, creating a 98 decibel sound in the middle of the intersection. What is the average sound level for each car?
March 20, 2014

Physics
A train blows its horn as it approaches a crossing. The train engineer observes a frequency of 118 Hz and a stationary observer observes a frequency of 122 Hz. What is the speed of the train? Use the speed of sound as 340m/sec
March 20, 2014

Physics
If a piano tuner hears 3 beats each second when listening to a 8 Hz tuning fork and a single string on the piano which is of higher frequency.. What is the frequency of the single string from the piano?
March 20, 2014

Finance
Anderson International Limited is evaluating a project in Erewhon. The project will create the following cash flows: Year Cash Flow 0 –$690,000 1 243,000 2 175,000 3 256,000 4 231,000 All cash flows will occur in Erewhon and are expressed in dollars. In an attempt to ...
March 19, 2014

Finance
Handy Enterprises has gathered projected cash flows for two projects. Year Project I Project J 0 –$215,000 –$215,000 1 104,000 75,000 2 93,000 86,000 3 79,000 96,000 4 72,000 105,000 Requirement 1: At what interest rate would the company be indifferent between the ...
March 19, 2014

physical science
Suppose you are camping in the mountains and you need to melt 1.8 kg of snow at 0.0 degC to 70.0 degC. The specific heat of water is 4186 j/kg*C while the latent heat of fusion for water equals 3.34 x 10^5 J/kg. How much heat will be needed? Express in KJ.
March 18, 2014

Physics
Smoking causes blood vessels to constrict. If the average blood vessel radius of a smoker decreases 7.6% and the body increases blood pressure to maintain a constant flow. Calculate the needed percent increase in pressure.
March 17, 2014

Physics
An artery supplying heat muscle with blood is occluded to 13.9% of its original radius by a clot. By what percent is the blood flow through this artery reduced.
March 17, 2014

Physics
Neglecting the pressure drop due to resistance, calculate the blood pressure in mmHg in an artery in the brain 32 cm above the heart. The pressure at the heart is 120mmHg and the density of blood is 1.05g/cm3.
March 17, 2014

Physics
A full term fetus may have a mass of 3.3 kg . If the entire weight of the fetus rests momentarily on the mother's bladder, supported on an area of 78.8 cm2 calculate the pressure exerted in mmHg.
March 17, 2014

Phsyics
Determine the absolute pressure at the bottom of a lake that is 66.1 m deep. Write your answer correct to two decimal paces let Patm = 101,300 Pa
March 13, 2014

Physics
A swimming pool has dimensions 26 m x 32 m and a flat bottom. When the pool is filled to a depth of 3 m with fresh water, what is the total force due to the water on the bottom?
March 13, 2014

Physics
A 71 kg girl dives off a raft 2.34 square meters floating in a freshwater lake. By how much does the raft rise in cm? Write your answer correct to two decimal places.
March 12, 2014

FInance
Most corporations pay quarterly dividends on their common stock rather than annual dividends. Barring any unusual circumstances during the year, the board raises, lowers, or maintains the current dividend once a year and then pays this dividend out in equal quarterly ...
March 10, 2014

Finance
Sully Corp. currently has an EPS of $2.35, and the benchmark PE ratio for the company is 21. Earnings are expected to grow at 7 percent per year. Requirement 1: What is your estimate of the current stock price? (Do not round intermediate calculations. Stock price $ ...
March 10, 2014

Finance
The stock price of Webber Co. is $68. Investors require an 11 percent rate of return on similar stocks. Required: If the company plans to pay a dividend of $3.85 next year, what growth rate is expected for the company’s stock price?
March 10, 2014

science
A new moon is discovered orbiting Neptune with an orbital speed of 9.3 ´ 10 m/s. Neptune’s mass is 1.0 ´ 10 kg. What is the radius of the new moon’s orbit? What is the orbital period? Assume that the orbit is circular. (G = 6.673 ´ 10 N·m/kg)
March 3, 2014

Physics
Suppose that 6.68 kg of shaved ice is needed to keep medications cold in a room that has no refridgerator. What amount of heat (in calories) is needed to be removed from water at 0 degrees Celsius to make ice. Write your answer correct to two decimal places.
February 26, 2014

physics
Severe stresses can be produced in the joints by jogging on hard surfaces or with insufficiently padded shoes.If the downward velocity of the leg is 7.3m/s when the joggers foot hits the ground. If the leg stops in a distance of 1.1 cm. Calculate the force on the ankle joint. ...
February 12, 2014

Math
Tory has two similar picture frames in her bathroom the ratio of the larger picture frame to the smaller picture is 5:2 if the perimeter of the smaller picture is 30 in what is the perimeter of the bigger picture frame
February 10, 2014

Physics
The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state?
February 8, 2014

science
After experiment was done.
January 30, 2014

science
If the student opened the bag after the above experiment, what would happen to volume of gas inside? A. The volume of gas in the bag will stay the same. B. the volume of gas in the bag will be decrease. C. The volume of gas in the bag will be increase. D. the volume of gas in ...
January 30, 2014

math
Then describe what happens when you increase the number by 100.
January 23, 2014

math
Find the missing number: 7x6=15+15+? 6+6=?+5
January 15, 2014

math
find the missing number: 6+6= ? +5
January 15, 2014

Physics
6.8 x 10^2 N
December 21, 2013

physics
a man pulls an 80 kg sled up an incline that is at an angle of 25 degrees with the horizontal using a rope attached to the sled at an angle of 35 degrees. If the coefficient of friction between the sled and the incline is 0.70, what force must the man exert on the rope to keep...
December 21, 2013

Engineering
Guys, I would be glad if you post the answer for this questions. Thank you so much.!
December 15, 2013

Algebra
A man invested $15,000. Part of the investment was put into an account that gave 7%, and part in an account that paid 6.5%. The interest earned was 1,520. How much was invested into each account?
November 27, 2013

math
solve 6x^3-13x^2+x+2=0 using a graphing calculator. then use your answer to write the given function in factored form. (do not use the factor theorem to factor this.) (6 marks)
November 25, 2013

Language art
Can you also check these type of infinitive phrases? Thanks 1.To have a balanced diet, keep the food triangle in mind. noun 2. To get good food at that place is impossible.noun 3.Brenda went to that popular, crowded cafe simply to see her friends.adv 4.We listened to Rosalie&#...
November 11, 2013

Language art
Can you check these also? Thanks 1.To have a balanced diet, keep the food triangle in mind. noun 2. To get good food at that place is impossible.noun 3.Brenda went to that popular, crowded cafe simply to see her friends.adv 4.We listened to Rosalie's suggestion to disguise...
November 11, 2013

Language art
What type of infinitive phrases are shown below (noun, adverb or adjective) 1.George wants to take Lea out tonight. adv 2.Would you like to read this detective novel? adj 3. Fifty years ago,people didn't know to avoid "bad"cholesterol. adv 4.My grandmother taught...
November 11, 2013

Language art
What type of infinitive phrases are shown below (noun, adverb or adjective) 1.George wants to take Lea out tonight. 2.Would you like to read this detective novel? 3. Fifty years ago,people didn't know to avoid "bad"cholesterol. 4.My grandmother taught me to make ...
November 11, 2013

Math
Bacteria A has an initial population of 500 and doubles everyday. Bacteria B has an initial population of 50 and triples everyday. How long will it take the population of bacteria B to overtake the population of bacteria A
October 27, 2013

math
Felicia paid $125 to join tennis club. paid $5 every time she used the court write an equation that describes Felicia's total cost for playing tennis as a function of the number of times she plays. let c =the total cost and let n = the number of times she plays. Describe ...
October 21, 2013

math
write an equation that describes Felicia's total cost for playing tennis as a function of the number of times she plays. let c =the total cost and let n = the number of times she plays. Describe the domain and range of the function.
October 21, 2013

Biology
My guessing on these answers on these questions that im not sure of that i posted is, 1. d 2. b 3. a 4. a 5. c 6. a
October 21, 2013

Biology
In mitosis, if a cell has 4 chromosomes in prophase, how many chromosomes will this cell have in metaphase? a. 64 b. 32 c. 16 d. 8 e. 4 If a cell has 20 chromosomes in G1, how many chromatids will be present during prophase? a. 30 b. 20 c. 5 d. 40 Which of the following ...
October 21, 2013

Math
The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose that 800 jawbreakers are selected at random form the production lines. Would it be unusual for this sample of 800 to contain 386 jawbreakers that weigh more than .4 ounces...
October 3, 2013

physics
An airplane has a mass of 32272.2 kg and takes off under the influence of a constant net force of 39990.0 N. What is the net force that acts on the plane's 78.5 kg pilot?
September 20, 2013

physics
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 7.0 kg projectile from rest to a speed of 4.0 x 103 m/s. The net force accelerating the projectile is 4.9 x 105 N. How much ...
September 20, 2013

physics
During takeoff, an airplane, climbs with a speed of 180 m/s at an angle of 34º above the horizontal. The sun is shining directly overhead. How fast is the shadow of the plane moving along the ground? (That is, what is the magnitude of the horizontal component of the plane...
September 20, 2013

physics l
A hill that has a 15 % grade is one that rises 15.0 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal?
September 20, 2013

physics
Marks: 5 A hill that has a 15 % grade is one that rises 15.0 m vertically for every 100.0 m of distance in the horizontal direction. At what angle is such a hill inclined above the horizontal?
September 20, 2013

physics
A 1523.7 kg car traveling with a speed of 20.8 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 53.5 m?
September 20, 2013

physics
An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.6 m/s in 4.0 s. Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed?
September 20, 2013

physics
Two workers are trying to move a heavy crate. One pushes on the crate with a force A, which has a magnitude of 445 N and is directed due west. The other pushes with a force B, which has a magnitude 325 N and is directed due north. What is the direction that the workers push ...
September 20, 2013

physics
A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 60.0º above the horizontal. The rocket is fired toward an 15.0 m high wall, which is located 27.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...
September 19, 2013

physics
A circus performer begins his act by walking out along a nearly horizontal high wire. He slips and falls to the safety net, 25.0 ft below. The magnitude of his displacement vector from beginning of the walk to the net is 26.7 ft. How far out along the high wire did he walk?
September 19, 2013

physics
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0 m/s. The car is a distance d away. The bear is 26 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
September 19, 2013

physics
Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown...
September 19, 2013

physics
A fire hose ejects a stream of water at an angle of 35.0º above the horizontal. The water leaves the nozzle with a speed of 25.0 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
September 19, 2013

math
There are 159 counties in Mississippi, 60 of these counties have French names, what percentage is that?
September 18, 2013

anology
what is bongo
September 14, 2013

physics
A car travels in a straight line for 4h at a constant spped 73km/h. What is its acceleration? Answer in units m/s^2
September 10, 2013

physics
Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown...
September 10, 2013

physics
10) Horizontal beam supported on both ends - square profil 100 × 100 × 5, length is 800 mm.It is bent by the force in the middle of the beam by 0.2 mm. To achieve approximately half of the value of deflection,you will use the beam:
August 22, 2013

science
16) Which material is the most suitable for absorption of vibration? a) Steel b) Cast iron c) Aluminium d) Manganese Bronze e) Bronze
August 22, 2013

physics
10) Horizontal beam supported on both ends - square profil 100 × 100 × 5, length is 800 mm.It is bent by the force in the middle of the beam by 0.2 mm. To achieve approximately half of the value of deflection,you will use the beam:
August 22, 2013

Physics/Formulas
Calculate the SI units of the constants A and B in each of the following equations. Assume that the distance x is in meters (m), the time t is in seconds (s), and the velocity v is in meters per second (m/s). a. x = A + B.t Meters = A + B * seconds b. x = ¼ A.t2 Meters...
August 21, 2013

science
16) Which material is the most suitable for absorption of vibration? a) Steel b) Cast iron c) Aluminium d) Manganese Bronze e) Bronze
August 21, 2013

physics
2) The weight of tank is 50 000 kg, area of his tracks is 5 m2. What pressure acts on the ground?
August 21, 2013

physics
10) Horizontal beam supported on both ends - square profil 100 × 100 × 5, length is 800 mm.It is bent by the force in the middle of the beam by 0.2 mm. To achieve approximately half of the value of deflection,you will use the beam:
August 21, 2013

physics
2) The weight of tank is 50 000 kg, area of his belts is 5 m2. What pressure acts on the ground?
August 20, 2013

physics
) Horizontal beam supported on both ends - square profil 100 × 100 × 5, length is 800 mm.It is bent by the force in the middle of the beam by 0.2 mm. To achieve approximately half of the value of deflection,you will use the beam:
August 20, 2013

physics
10) Horizontal beam supported on both ends - square profil 100 × 100 × 5, length is 800 mm.It is bent by the force in the middle of the beam by 0.2 mm. To achieve approximately half of the value of deflection,you will use the beam:
August 20, 2013

physics
2) The weight of tank is 50 000 kg, area of his belts is 5 m2. What pressure acts on the ground?
August 20, 2013

physics
2) The weight of tank is 50 000 kg, area of his belts is 5 m2. What pressure acts on the ground?
August 20, 2013

physics
7) The train goes by speed 12 m/s on a horizontal track. Rain drops are falling vertically by speed 9 m/s. What is the velocity of the drops falling onthe train windows?
August 20, 2013

physics
6) The goalkeeper catches the ball flying by speed 30 m / s and stopped its movement in a period of 0.15 seconds . What force did he act on the ball, if we consider the stopping of the ball for constantly slow motion? Weight of the ball is 400 grams.
August 20, 2013

Chem
How do I Balance the equation. HC2H3O2(aq)+Ca(OH)2(aq)→H2O(l)+Ca(C2H3O2)2(aq)
August 16, 2013

Trigonometry
a flagpole 25 feet tall stands on a top of a building. from a point in the same horizontal plane with the base of the building. The angle of elevation of the top and the bottom are 61°30' and 56°20' respectively. How high is the building?
July 11, 2013

Trigonometry
a flagpole 25 feet tall stands on a top of a building. from a point in the same horizontal plane with the base of the building. The angle of elevation of the top and the bottom are 61°30' and 56°20' respectively. How high is the building?
July 11, 2013

math
x^2+3x-10 divided by x-2
June 26, 2013

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Next>>

Search
Members