Questions Asked on
July 2, 2011

physic
Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?
asked by noah 
Chemistry
Arrange the compounds in order of increasing boiling point. A) CH4 B)CH3CH3 C) CH3CH2Cl D) CH3CH2OH **I know High Intermolecular force = High boiling point!** My question is if A, B & C are dipoledipole, and D is hydrogen bonding.. how can i determine
asked by Tc 
physics
A heavily loaded freight train moves with constant velocity. What is the relationship between the net force on the first car (F1) and the net force on the last car (F2)? A. F1=F2 B. F1>F2 C. F1
asked by alexa 
physic
Starting from rest, a car accelerates at 2.5 m/s^2 up a hill that is inclined 5.4 ^\circ above the horizontal. how far the car travel horizontally in 15s?
asked by Anonymous 
physic
Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?
asked by noah 
physics
A 2172.5 kg car is coasting along a level road at 34.7 m/s. A constant braking force is applied,such that the car is stopped in a distance of 50.5 m. What is the magnitude of the braking force? Answer in N. Here is my way, but im not sure if im correct:
asked by alexa 
physics
On planet x, an object weighs 10.4N. On planet B where the magnitude of the free fall acceleration is 1.48g (where g=9.8 m/s^2 is the gravitational acceleration on Earth),the object weighs 24.6N. The acceleration of gravity is 9.8 m/s^2. What is the mass
asked by alexa 
chemistry
Calculate the molarity of a phosphoric acid(H3PO3)solution that is 84% by mass phosphoric acid and has a density of 1.87g/mL.?
asked by Lahna 
chemistry
Q1.A compound of copper and sulphur is 65.43percent copper by mass.how many grams of copper can be obtained from 249g of this compound?and how many grams of sulphur remain?
asked by watson 
Physics
A rectangular coil of 70 turns, dimensions 0.100 m by 0.200 m and total resistance 10.0 ohms, rotates with angular speed 32.0 rad/s about the y axis in a region where a 1.00 T magnetic field is directed along the x axis. The rotation is initiated so that
asked by Mike 
physics
A 3.0 m tall, 42 cm diameter concrete column supports a 230,000 kg load. By how much is the column compressed? Assume Young's modulus for concrete to be 3.0 1010 N/m2. in mm
asked by Kate 
physics
A toy car is given a quick push so that it moves on an inclined ramp. After it is released, it moves up, reaches its highest point and moves back down again. Friction is so small it can be ignored. What net force acts on the car? A. net force of zero B.
asked by alexa 
physics
A female gymnast weighs 200 N. If she is hanging stationary from a high bar,how many forces are acting on her? A. one B.five C.four D.two E.three WOuld it be choice A or D?
asked by alexa 
physics
A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 3.87 s after the stone is dropped. How deep is the hole?
asked by alicia 
finance
On June 26, 2004, Elaine purchased and placed into service a new computer system costing $8,000. The computer system was used 80 percent for business and 20 percent for personal use in both 2004 and 2005. Elaine claimed only regular MACRS depreciation. In
asked by Elizabeth 
AP World History Please help
What was the nature and extent of the Umayyad Empire? How did the Abbasid Empire differ from the Umayyad Empire? What were the achievements of the Arab phase of Islamic development ending in 750? I just want to know how they want me to answer these
asked by Nina 
physics
A man is pulling on a rope with a force of 88N directed t an angle or 20 degrees to the horizontal. What is the x component of this force? What is the Y component of this force? Answer in units of N This is what i did, but i don't know if its right: x:
asked by alexa 
nutrition
How many grams of nitrogen are contained in a 2,500 kcal diet that provides 15% of the energy as protein? What would be the approximate weight gain of a person who consumes an excess of 500 kcal daily for one month? Which of the following is an FDA
asked by allison 
chemistry
explain how to set up: what mass of iron(III) carbonate would be produced if 545 ml of 0.150 M iron(III) choloride were added to a solution containing excess sodium carbonate. Given reaction of 2FECL3(aq) + 3Na2CO3(aq) Fe2(CO3)3 (s) + 6 NaCl (aq) thank
asked by Jamie 
physics
A BOY IS HANGING FROM A BRANCH OF A TREE THE TENSION IN THEW ARMS WILL BE MAXIMUM WHEN THE ANGLE BETWEEN THE ARMS IS
asked by NEEHARIKA 
Algebra
Annual profit in thousands of dollars is given by the function, P(x) = 12x100, where x is the number of items sold in thousands x ¡Ý 10. Will this profit function have a maximum if so what is it?
asked by Sheila 
physics
A force is applied to a 2.6 kg mass and produces 2.7 m/s^2 acceleration. What acceleration would be produced by the same force applied to 14.9 kg mass? Answer in units of m/s^2 Here is my work, but i wanted to make sure if it was right or not:
asked by alexa 
Trigonometry
Verify Identity: cos5xcos3x=8sin^2x(2cos^3xcosx)
asked by Erik 
physics
Sue and Jenny kick a soccer ball at exactly the same time.Sue's foot exerts a force of 62.3 N to the north. Jenny's foot exerts a force of 115.9 N to the east. What is the magnitude of the resultant force on the ball? Answer in N. What is the direction of
asked by alexa 
Algebra II
A picture is four inches wide and six inches long. It has an additional border of uniform width. If the area of the picture is equal to the area of the border, what is the width of the border?
asked by Morgan 
PHYSICS
A particle with a mass of 2.00x1016 kg and a charge of 22.0 nC starts from rest, is accelerated by a strong electric field, and is fired from a small source inside a region of uniform constant magnetic field 0.660 T. The velocity of the particle is
asked by jim 
physics
An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the elevator accelerates? The
asked by alexa 
physics
An elevator is being lifted up an elevator shaft at a constant speed by a steel cable. All fricional effects are negligible. In this situation,forces on the elevator are such that?: A.the upward force by the cable is greater than the downward force of
asked by alexa 
english
fill in the blanks with appropriate preposition 1.you are asked to read _______books you have with you. (few?afew?the few)
asked by anjan 
physics
This question refers to my question that was replied to: Sue and Jenny kick a soccer ball at exactly the same time.Sue's foot exerts a force of 62.3 N to the north. Jenny's foot exerts a force of 115.9 N to the east. What is the magnitude of the resultant
asked by alexa 
chemistry
How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) > 2NaCl(aq( + CO2(g) + H2O(I)
asked by ashley 
english, poetry meanings
using "a,b,c,d,e,f,g" notation, explain the ryme schem of "let me not to the marriage of true minds.
asked by jennifer 
English
Hello. I'll really appreciate some help with English. 1)Is it possible to say "the peacemaking process in the Middle East" or is it just "peacemaking in the Middle East" or "the peace process in the Middle East"? 2)Is it possible to say "the rebels have
asked by Ilma 
com155
Can you check my paragraph for grammar errors, strong topic/concluding sentence,and any other recommended feed back? Paragraph two was more effective than paragraph one because it contained sentence variety and rhythm. Paragraph one consisted of short
asked by blake 
finance
On June 26, 2004, Elaine purchased and placed into service a new computer system costing $8,000. The computer system was used 80 percent for business and 20 percent for personal use in both 2004 and 2005. Elaine claimed only regular MACRS depreciation. In
asked by Elizabeth 
physics
A dragster and driver together have mass 918.8 kg. The dragster,starting from rest,attains a speed of 25.8 m/s in .53s . Find the average acceleration of the dragsters during this time interval. Answer in units of m/s^2. What is the size of the average
asked by alexa 
Usubstitution (calculus)
this is an example from the book. I do not understand where the 1/2 comes from in (1/2u)du. Find indefinite integral. ((.3x.2)/(.3x^2.4x+2))dx u=.3x^2.4x+1 du= 2(.3x+.2)dx 1/2u(du)= 1/2 In u + c 1/2 In(.3x^2.4x+2) + c
asked by Steff 
chemistry
How many grams of Na2CO3 are required to completely react with 35.6mL of a 0.315M HCl solution? Na2O3(s) + 2HCl(aq) > 2NaCl(aq( + CO2(g) + H2O(I)
asked by ashley 
geometric problemmath
in triangle ABC,side AB IS 2cm. shorter than side AC, while side BC is 1cm. if the perimeter is 62 find the lenght of three sides? i need the answer tomorrow pls... help me
asked by aira 
Algebra
Solve by factoring: 10t^2 – t − 2 = 0
asked by toni 
write a paragraph
well i want to write a paragraph without mistakes would you please give me a subject and i'll talk about it and then you can correct it for me i have an exam that week so i'm waiting for your answer thank you.
asked by akabli 
Principles of Accounting I
Deliverable Length: 510 PowerPoint slides / can include an Excel file for financial analysis Details: Choose a public company in the food industry. Analyze the financial statements and assess whether the financial performance has improved or declined
asked by sam 
Organic Chem Lab
Assume your unknown ketone is 2pentanone. What is the molar mass of your 2,4dinitrophenylhydrazone product? I don't need or even want the answer, I just need an explanation of how to start working the problem. Thanks!
asked by Sarah 
chemistry
How can you test how much can dilute sulfuric acid before it stops showing signs of normal acidic reactions?
asked by cedric 
Math
Solve using the elimination method 3x+11y=34.5 9x7y=16.5
asked by Ms.Ellis 
Medical Coding
Child with cigarette burns on buttocks (bilateral)and multiple contusions on body;on skeletal survey,there are numerous old healed faractures; child was injured by mother
asked by Anonymous 
physics
A 4100 kg helicopter accelerates upward at 2.44 m/s^2. The acceleration of gravity is 9.8 m/s^2. What lift force is exerted by the air on the propellars? Answer in N. I wasn't sure which way to approach this problem, so i tried it two different ways: A.
asked by alexa 
Statistics(Please help)
I have a chart that has 4 columns across the top and 33 going down. The colunms on the top read: predicted number, selected number, (col 1  col2)^2, and the mean of x. Their are 32 predicted numbers and 33 selected numbers. I need to fill in the column
asked by Hannah 
nutrition
Case Study: You are a dietician. You are a friend of Mitch’s family and have been asked to help develop a nutrition and exercise plan for Mitch. Mitch is a 67 year old male that has been gaining weight over the last three years. He is 5’11’ and
asked by beth 
math
Use frontend estimation with adjustment to estimate each of the following: a. 2345 + 5250 + 4210 + 910 b. 345 + 518 + 655 + 270
asked by judy williams 
social studies
hi hello i have 2 make my sst assignment on topics "preparedness for disasters" and clothing a social history of development.would u please tell me how should i start my assignment
asked by dilpreet dyal 
Education
Why is science an integral part of the playcentered curriculum?
asked by Tina 
physics
how the frequency of the sound produced will change in the case of aluminium sting of length 15cm when the string is tied between two ends
asked by lakshya 
physics
The two ends of a train moving with a constant acceleration pass a certain point with velocities u and v.what is the velocity with which the middle point of the train passes the same point?
asked by pavatharani 
math 95
how to solve this math problem x/3  8 = 2
asked by kathy 
Math
In the figure below, the area of the larger square is 50 square centimeters and the area of the smaller sqaure is 18 square centimeters. What is x, in centimeters?          
asked by Vidwatta 
Math
solving using the solution method. x+10y=41 x+9y=37 =
asked by Ms.Ellis 
early childhood
What is a good scenario for depict a collectivitic culture?
asked by red 
Physics
A vertical spring with a force constant of 250 N/m is compressed 7.5 cm and a 0.30 kg ball placed on top. The spring is released and the ball flies vertically upward. How high does the ball go? h=________cm (thanks for helping :D)
asked by Yelliz 
math
equation of the line containing the points (4, 5) and (1, 3)
asked by alex 
physics
two point charges +36 and 16 microcoulumb are placed 10 cm apart. at a point x, there is no resultant force on positive charge. the distance of x from +36 microcoulumb charge is
asked by mani 
Education
Can you explain why teachers who wish to promote a developmentally appropriate science education program must be knowledgeable about children's level of development.
asked by Tina 
math
. Prove that x  y = y – x; for all integers x and y.
asked by judy williams 
precal
tan((theta/2)+(pi/6))=1
asked by vince 
Science
Why the velocity of a pendulum bob is maximum at its bottom position?
asked by Durga 
English
1. The milk has gone sour. 2. He went mad. 3. The man went bald. 4. The old lady went blind. 5. He went weak. 6. She went bankrupt. 7. Bill has gone poor. (Are they all grammatical?)
asked by rfvv 
pharmacology
where are alpha receptors are located?
asked by mehwish 
U S History
I need to find out the evolution of Sectionalism and Southern Succession and its theme to individualism. I cant seem to understand this and tie it together. I would greatly appreciate any help I can get
asked by Gloria 
physics
A car trvelling at 60km/h overtakes another car travlling at 42km/h.Assuming each car to be 5.0m long.find the time taken during the overtake.
asked by pavatharani 
ecpology
what are the chemical or cellular threats that excessive heat bring to plants?
asked by maria 
HistoryCivil War
How important was the Union blockade to defeating the Confederacy, and how could the Union have won without it ?
asked by Joanne 
anthropology
What do languages tell us about migration? Draw a map (s) showing the different language families
asked by ami 
chem
The average distance between planet X and Earth is about 1.5 x 10^8 miles. How long (minutes would it take pictures transmitted from a space vehicle on Planet X's surface to reach Earth?
asked by tim 
gammar
The (eagles',EAGLE'S)sharp beak is (MORE, most)powerful than the (TURKEYS', turkey's) beak. Correct?
asked by lizzie 
algebra
The perimeter of a square is equal to its area plus four. What is the measure of one side of the square?
asked by Amber 
Algebra II
A rectangle is 5 inches wide and 6 inches long. If each side is increased by x, the area is tripled. What is the value of x?
asked by Carlos 
Algebra II
A rectangle’s length is one greater than its width and its area is 30 in2. What are the dimensions of the rectangle?
asked by David 
Sociology
Why do Sociologist use Surveys and what type of data do they receive from survey research? What are the advantages and disadvantages of using surveys?
asked by Roz 
Englis
The teacher said they were going to grade the test over the weekend. __ Pronoun shift in number __ Pronoun shift in person _X_ Ambiguous reference __ No error
asked by BJ 
algebra 1
what statements can i make?
asked by analiza 
English Reading
Whats a good book that's somewhat similar to "LIKE WATER FOR CHOCOLATE" by LAURA ESQUIREL. Please Help && If You Have Any Other Suggestions I'm Open To Any. thanks (;
asked by Cathy 
Education
What is an example of play that relates to a curriculum standard in mathematics?
asked by Tina 
Education
What is the goal of early childhood science education?
asked by Tina