Questions Asked on
June 17, 2012

Physics Gravity
A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1km g = R w^2 = 9,8 m/s^2 R = 550 m How do I convert the
asked by Mike Joseph 
physics
A 0.40kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 2.1m on a frictionless horizontal surface.If the cord will break when the tension in it exceeds 80N , what is the maximum speed the ball can have?
asked by Anonymous 
chemistry
I have: the half life of U238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disintegrations per second. find percent by mass of U238 in rock. I have 4.5x 10^9x60x60x365x24=1.419x 10^17= .693/1.419 x10^17 =4.883x10^18 =rate 1.6/238=.006722
asked by Nancy 
Physics
How much energy is required to move a 900 kg object from the Earth's surface to an altitude twice the Earth's radius?
asked by Kyla 
math
A car has a 12 volt battery. The engine has a resistance of 0.22 ohms. How many amps will be drawn from the battery when the key is turned?
asked by Leo 
Chemistry
How much heat is liberated when 0.113 mole of sodium reacts with excess water according to the following equation? DH = 368 kJ/mol rxn
asked by naik 
math
This is confusing: This proportion can be changed to (0.45)y = x, where x represents the person's weight in kilograms and y represents the person's weight in pounds. The recommended protein in grams is numerically equal to the person's weight in kilograms.
asked by Leo 
chemistry
Calculate the concentrations of all species in a 1.67 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. I know how to find the Na^+ and SO3^2 but I don't know how to find
asked by Johnny 
chemistry
A 1.50 liter gas sample at 745mm HG and 25 celsius contains 3.55% radon by volume radon220 is an alpha emitter with a half life of 55.6 seconds. how many alpha particles are emitted in 5 minutes by this sample? I got an answer 1.59x10^19 I started at
asked by Nancy 
Chemsitry
Use these data to estimate Avogadro's number. Palladium crystallizes with a facecentered cubic structure. It has a density of 12.0g/cm^3 , a radius of 138 pm , and a molar mass of 106.42 g/mol .
asked by Lauren 
math
You must cover a hole that is elliptical in shape. You measure the major and minor axes and find them to be 6 ft. and 4.5 ft. respectively. If you want a 6 inch overhang around the hole, how much covering will you need? (Round to the tenths place.)
asked by Leo 
Physics
A 1400 kg car rounds a curve of 57 m banked at an angle of 14 degree If the car is traveling at 98 km/h, how much friction force will be required? I cannot figure out how to solve this problem. Someone please help me?
asked by Mike Joseph 
Physics
Planet Jupiter revolves around the Sunin 12 years (3.79 X 10^8 sec. What is its mean distance from center of Sun? mass of sun is 1.99 x 10^30 kg.
asked by Christine 
science
an arrow is shot into air. its range is 200m and its time of flight is 5s . if g=10m/s2 ,then horizontl compoent of velocity and the mximum height will be
asked by shilpa 
Chemistry
In the following experiment, a coffeecup calorimeter containing 100 \rm mL of \rm H_2O is used. The initial temperature of the calorimeter is 23.0 \rm ^{\circ}C. If 9.80 g of \rm CaCl_2 is added to the calorimeter, what will be the final temperature of
asked by Ali 
Finance
Aset P has a beta of 0.9. The riskfree rate of return is 8%, while the return on the S&P 500 is 14%. Asset P's required rate of return is:
asked by Melissa 
Physics
A 3.30kN piano is lifted by three workers at a constant speed to an apartment 28.8 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 197 W of power, and the pulley system is 75.0% efficient (so
asked by Kristin 
math
what percent of 67 is 33? round to the nearest tenth of a percent. the answer is 49.3% but i don't know how he got that can you explain
asked by Taylor 
Beginner Alegra
From a point on a straight road, Nico and Maria are riding bicycles in the same direction. Nico rides at 12mph and Maria rides at 14mph. In how many hours will they be 11 mi apart?
asked by Jen 
physics
a source of sound id traveling towards a stationary observer .The frequency of sound is heard by the observer is 25% more that the actual frequency.If the speed of sound is v,that of the source is options: 1.v/4 2.v/5
asked by ashu 
Physics help!!!
What potential difference is required in an electron microscope to give electrons a wavelength of 0.05 nm ?
asked by David E 
Math
A square garden plot measures 180 square feet. A second square garden plot measures 405 square feet. How many more feet of fence will the second garden plot require over that required for the first garden plot. But how did they get this???????
asked by Julie 
physics
a gun is fired from a distance of 1.2 km from a hill.the echo of the sound is heard after 7.1 seconds at the same place. Calculate the velocity of sound.
asked by edward 
physics
to an observer the pitch of the stationary source of the sound appears to be reduced by 20% if speed of sound is 340m/s then sped and direction of 5he observer is options 1.68 m/s away from the observer 2.96 m/s away from the observer
asked by ashu 
physics
Find the temperature at which the velocity of sound in air is 1.25 times the velocity of sound at 0 degree centigrade.
asked by srikar 
Physics
What is the maximum speed with which a 1150kg car can round a turn of radius 71 m on a flat road if the coefficient of static friction between tires and road is 0.80? May someone walk me through this problem step by step? Thank you *The equation friction
asked by Mike Joseph 
Physics ( light)
A student doing Young's experiment measures a distance of 6.0 cm between the first and seventh nodal points on a screen located 3.0 m from the slit plate. a) if the slit seperation is 220^ 6, what is the wave length of light being used ? b) what colour is
asked by David E. 
Grade 11 Math
From a window in apartment building the angle of evaluation from the top of the flag pole across the street is 9 degrees. The angle of depression is 22 to the base of flag. How tall is flag pole to the nearest of tenth meter?
asked by Sarah smith 
Finance
MMK Cos. normally pays an annual dividend. The last such dividend paid was $2.3, all future dividends are expect to grow at a rate of 6 percent per year, and the firm faces a required rate of return on equity of 18 percent. If the firm just announced that
asked by Anonymous 
Chemistry
Neon gas produced for use in luminous tubes comes packaged in 1.0L containers at a pressure of 1.02 atm and a temperature of 24°C. How many moles of Ne do these cylinders hold?
asked by Jamie 
physics
Jupiter's gravitational field at the surface is approximately three times that of the earth. A person weighing 120 lb. on the earth's surface would weigh how much on Jupiter?
asked by Leo 
Chemistry
Nitrogen gas and sodium liquid are produced by the decomposition of sodium azide NaN3 (s). what volume of nitrogen gas, measured at 25 C and 0.980 atm, is produced by the decomposition of 62.5 g of sodium azide
asked by Anonymous 
Physics
How much energy is required to move a 900 kg object from the Earth's surface to an altitude twice the Earth's radius?
asked by Kyla 
science
describe the mixture that resulted after mixing.
asked by christine mae 
Chemistry
How much heat is liberated when 0.113 mole of sodium reacts with excess water according to the following equation? DH = 368 kJ/mol rxn
asked by naik 
Physics please help
A student doing Young's experiment measures a distance of 6.0 cm between the first and seventh nodal points on a screen located 3.0 m from the slit plate. a) if the slit seperation is 220 x10 to the 6, what is the wave length of light being used ? b) what
asked by Fernando 
Physics
A shipwrecked mariner is stranded on a desert island. He seals a plea for rescue in a 1.00 liter bottle, corks it up, and throws it into the sea. If the mass of the bottle, plus the message and the air inside, is 0.454 kg, what percentage of the volume of
asked by Jamie 
Physics help
A 0.50kg block rests on a horizontal, frictionless surface, it is pressed against a light spring having a spring constant of k = 800 N/m, with an initial compression of 2.0 cm. To what height h does the block rise when moving up the incline? what would be
asked by user 
math
how to write 9.035 in expanded notation
asked by don 
chemistry
a 3.00g sample of baking soda is heated and decomposes according to the reaction below. Calculate the theoretical yield in grams for each of the three products Na2Co3. H2O, CO2
asked by Chloe 
Biology
Is Wind Power Green? I am writing a paper and I need to put together an outline of my final paper. I would just like to know if the following paragraph I have put together can serve as a thesis statement? "The idea that the world is reaching a possible
asked by BJ 
Mergers and Acquisitions
How does goodwill (under FASB 141 R) impact cash flows of the combined entity? How do the 1993 tax law changes impact goodwill and the after tax cash flows of the combined entity after the M & A?
asked by Steven 
Chemistry
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?
asked by B 
Homework test
An artifact was found and tested for its carbon14 content. If 70% of the original carbon14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon14 has a halflife of 5,730 years.
asked by Randy 
Calculus
y=cos3x(sin^3)x
asked by Tom 
statistics
A biologist reports a confidence interval of (3, 2, 3, 8) when estimating the mean height in (in centimeters) of a sample of seedlings. The estimated margin of error is __________ , The sample mean is ________.
asked by kathy 
physics
an object weighs 3 lb. at 10 earth radii from its center. What is the object's weight on the earth's surface?
asked by Leo 
Physics
An air filled parallel plate capacitor initially has a capacitance of C = 4.57 nF. Then the air gap between the plates is filled with two different dielectric materials with equal volume but with relative permittivities of å1 = 3.68 and å2 = 9.23
asked by Anonymous 
statistics
39% of households have some sort of high speed internet service. 15 homes are selected at random. the probability that 5 homes will have high speed service is?
asked by Anonymous 
math
How many hours is it between 2135 hundred military time and 1325 hundred ?
asked by Cecile 
Physics
If you know that the period of a pendulum is 1.87sec. What is the length of that pendulum? (gravity 9.81m/sec squared)
asked by Christine 
Physics
A mass is stretched 4cm from equilibrium position of a spring. If the displacement is doubled, what can be concluded about the restoring force? A. It halved. B. Same C. Increased by 4 D. Decreased by 4
asked by Christine 
Math
Let an angle in quad IV such that cos= 2/5 find exact value of csc and cot
asked by Anonymous 
Physics
10. A yoyo is made by wrapping a 2m long string around a 500g 10cm diameter uniform disk. The string is fastened to the ceiling, and the yoyo is released. What is the tension in the string as the yoyo falls? A.9.8N B.1.6N C.4.9N D. 0.49N E.3.3N The
asked by James 
Physics
A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0234 m deeper into the water. What is the weight of the rock?
asked by Jamie 
Physics
What is the typical wavelength of an Xray ? I searched google and I couldn't find it. If you know the answer I'd appreciate it .
asked by Fernando 
Physics
Anyone can help me with these questions: 1. BC Hydro charges $5.91 per kWh. How long does it take a 100 W light bulb to use up $1.00 of energy? (answer = 1.7h) 2. A small bag of chips contains 230 Calories (1000 calories = 1 calorie = 4.19 kJ). To what
asked by john 
physics
Using Coulomb's Law, calculate the force of repulsion between a positive charge of 110 Coulombs and another positive charge of 220 coulombs separated by a distance of 2 meters. Use scientific notation. (Hint: use the proportionality constant)
asked by LL 
physics
Archimedes decides to take a warm bath. If 1 calorie equals 4.187 Joules, and the heat of fusion of ice/water is 334 J/gram, calculate the number of calories it takes to liquefy a solid block of ice of mass 100 kg at 0°C. Use scientific notation.
asked by LL 
Physics
A 13.0 kg box is released on a 33 degree incline and accelerates down the incline at 0.20 m/s^2 What is the coefficient of kinetic friction? * If I know the friction force impeding the object motion is 67 N. How do I find the coefficient of kinetic
asked by Mike Joseph 
physical science
an object is observed to fall from bridge striking the water below 2.25s later with what velocity speed did it strike the water
asked by lora 
Statistics
A professor receives, on average, 8 emails from students on the day before an online quiz. If the distribution of the calls is Poisson, what is the chance that he received at least 6 and at most 10 emails on such a day?
asked by Alexander 
Business Math
Joanne Flynn bought a new boat for $16,200. She put a $2,800 down payment on it. The bank’s loan was for 50 months. Finance charges totaled $5,380.00. Assume Joanne decided to pay off the loan at the end of the 22th month. (Rule of 78) What rebate would
asked by Riquetta Elliott 
Calculus
y=cos3x(sin^3)x
asked by Raechel 
Algebra
I need help doing this problem, should I not get the same answer with each technique? Please help. What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation: 2x² + 3x + 1 = 0
asked by Vilma 
math
at the school store 6 pencils sell for $.99. at this rate what is the cost of 16 pencils?
asked by Taylor 
Math
solve the equation, 2D + 3 = 13, 12E  3 = 0
asked by Linda 
chemistry
Calculate the residence time of sodium in millions of years if the total amount of sodium in the oceans is 1.5 x 10 to the 22 grams, and is supplied to the ocean at a rate of 2.2 x 10 to the 14 grams per year.
asked by Dewayne 
geometry
write the statement in symbols using the p and q given below. Then construct a truth table for the symbolic statement and select the best match. p= The mouse is in the house q= The cat is hungry.
asked by angela 
physics
Using Coulomb's Law, calculate the force of repulsion between a positive charge of 110 Coulombs and another positive charge of 220 coulombs separated by a distance of 2 meters. Use scientific notation. (Hint: use the proportionality constant)
asked by LL 
Business law
Grocery, Inc., is a retail grocery store chain based in Any State, U.S.A. and has stores throughout the United States. Grocery, Inc. has written contracts with many different vendors to purchase the products they sell in their stores. Vendors range from
asked by Cho Ramirez 
Mergers and Acquisitions
Fair value determination of goodwill and calculating the premium paid over market value in a merger: Using fair value accounting for goodwill, under FAS 141R, determine the amount of Goodwill that "the acquiring company" enters on its balance sheet in the
asked by Steven 
Mergers and Acquisitions
Define winner's curse in the context of M & As. How can the buying company avoid the pitfalls of the winner's curse?
asked by Steven 
physics
got 22 degrees celsius for the last answer from Damon. Another question is ......How much heat is needed to raise the temperature of a 500g object with specific heat capacity 0.5 cal/g c by 25 degrees?
asked by tony 
Science
Ms. Sue I understand, but what the professor requested was the following: NOTE: In the “Sample: Outline,” it states that the thesis statement is the last one to three sentences of the introduction. However, the thesis statement must be one sentence in
asked by BJ 
physics
I asked this question before: if the force of 60 N is exerted on a 15 kg object, calculate the acceleration that the object undergoes. I was told to use Newton's law of a=F/m. I got an answer of 4 m/s(squared). Is this answer correct?
asked by Leo 
Chemistry (DrBob222)
Hi Dr. Bob would you please tell me what D rpresents? Thank you! What is the reactant, products, and what compounds is it? Is it H2O, O2, or what? What are the transition molecules? Help please. Do as below to get to the image. I couldn't put the URL in
asked by Anonymous 
Physics
Two boxes, mass 4.0 kg and 5.0 kg are set next one another on a frictionless surface. The first box is pushed with a force of 35 N. What normal forces does the second box exert on the first box during this process? (ans: 19 N) How do you do this question?
asked by anonymous 
math
8/9 x + 2/3 x = 1/9 x + 45
asked by Scout 
french
i want to learn this language. Please write some french sentences and also translate them into english. Please earlier, its very urgent.
asked by edward 
Biology Lab
Can you please show me how to answer this question using C1V1=C2V2 A scientist receives a vial containing a protein at at concentration of 35mg/ml and is asked to add 0.25ml of it to 6.75mls of Biuret solution. What is the concentration of protein in the
asked by Mandy 
chinese
translate these sentences: 1 i am not free. 2 good bye i'll see you later. 3 hello how are you? 4 don't disturb me, let me study. 5 may you please give me this book.
asked by edward 
organic chemistry
how to calculate the % oil of thyme in thyme ? We did an experiment titled : the extraction of Thymol in thyme oil and the prof wants us to calculate the % oil of thyme in thyme... how do I do that ? Thanks
asked by Heidi 
Geometry
Ida plans to construct a square showing exact measurements of the sides. Which combination of tools would best help Ida construct the square?
asked by Stephanie 
math
75 is 5/2 of greg's age
asked by james 
physics
what is the equilibrium temperature if 100 grams of water at 20 degrees celsius is added to 50 grams of water at 62 degrees celsius in an insulated container of negligible mass?
asked by tony 
Geometry
If the ladder extends to a length of 158 inches, what is the height of the house rounded to the nearest hundredth of an inch? Type the numeric answer only in the box below.
asked by Sarah 
Calculus
Determine the work done by force f=[1,4] in newtons for an object moving along the vector d =[6,3] Okay i found the vector equation and then the parametric and now i have no clue what do please help :) One more thing there a question that say given the
asked by Sunny 
Math
Obtain the differential equation from the following: 1. y=C(subscript 1)e^x+ C(subscript 2)xe^x 2. y=[C(subscript 1)e^2x]cos3x+[C(subscript 2)e^2x]sin3x
asked by Jet 
ANT101 Cultural Anthropology
I am having problem with week four quiz. First question is: Traditionally, a caste in India:
asked by Haroldine 
Physics
1) How much longer would it take for light to travel through 1.0 km of water than 1.0 km of air? What formula do you use? The answer is 1.1 x 10^6 s 2) The acetate roll on overhead projector is placed at a distance 1.2f from the lens. (where f is the
asked by anonymous 
Math
Contract the expressions. In (3)  2 In (4)+ In (8)= In (3)  2 In (4+8) = In (3)  2 (In (4) + In (8) ) =
asked by Linda 
finance
You currently have $22,500 in your retirement account. What annual rate of return will you need to make on your investment in order to have $1,000,000 in the account on your 60th birthday? Will investing in CDs get you to your goal?
asked by jan 
Physics
1. A 2.5kg rock is dropped from a 350m cliff. It hits the ground with a speed of 60 m/s. What percent of its mechanical energy was lost to air resistance? the answer is 48% 2. A motor uses 5500J to lift a 35kg object a vertical distance of 12m. What is
asked by lenny 
MATH 7
Estimate the number of digits in your answer. 2.00 divide 8
asked by KEVIN 
pre algebra
7x 11 – 42 evaluate show its done please my answer I got is 35
asked by toni 
Calculus
evaluate the limit: lim cos(x + pi/2)/x x>0
asked by Tom 
spanish
please translate these sentences into spanish: 1.how are you? 2don't disturb me? 3.i want to drink something. 4.oh, i got it. 5. I want to do my work. 6.please be quite.
asked by edward 
organic chemistry
how to calculate the % oil of thyme in thyme ? We did an experiment titled : the extraction of Thymol in thyme oil and the prof wants us to calculate the % oil of thyme in thyme... how do I do that ? Thanks
asked by Heidi 
organic chemistry
how to calculate the % oil of thyme in thyme ? We did an experiment titled : the extraction of Thymol in thyme oil and the prof wants us to calculate the % oil of thyme in thyme... how do I do that ? Thanks
asked by Heidi 
Calculus
derivative of y=tan^3(x)
asked by Tom 
Chemistry
Hi everyone, I really need help with this problem. What is the reactant, products, and what compounds is it? Is it H2O, O2, or what? What are the transition molecules? Help please. Do as below to get to the image. I couldn't put the URL in and it isn't my
asked by Anonymous 
Business Law
Grocery, Inc. has a written contract with Cereal, Inc. to purchase 20 cases of cereal per month at $22 per case. The contract does not state the types of cereal or how the 20 cases will be divided among Grocery, Inc.’s 20 stores in Any State. After a
asked by Cho Ramirez 
word choices
Did you win or (loose or lose) the game?
asked by Jim 
physical Edu
Identify the effects of MDMA: a. can result in a heat stroke b. can cause dehydration c. increases heart rate and blood pressure d. increases feelings of closeness e. all of the above can be effects of MDMA use. is it C
asked by Andy 
Chemistry
Will someone please help me? I had a question and i answered it, but i coudn't draw a picture for it. Can some help me draw a picture for it or tell me how to draw it step by step. Thank you. The nucleus is made up of protons and neutrons. Protons and
asked by Anonymous 
Geometry
I need help with these problems: 11. The 2 captains of the school football team meet with the 3 captains of another team for the coin toss. If each captain shakes hands with each captain from the opposing team, how many different handshakes occur? 14. Find
asked by mysterychicken 
Mergers and Acquisitions
List any three of the reasons why the firm would continue to exist beyond the point where its products have become obsolete.
asked by Steven 
Mergers and Acquisitions
Why did M & A activity decrease in the late 1980s and early 1990s? Why did M & A activity increase again in the latter part of the 1990s?
asked by Steven 
physics
in a hypothetical thermometer, the freezing point of water is marked as 10 and the boiling point is marked at 70. What would be the reading if this thermometer is used to measure the temperature of 50 degree water?
asked by tony 
science
what animals don't have a circulatory system. please answer fast thank you
asked by sally 
Chemistry
The density of a liquid is 3.22 g/mL. How many milliliters are there in 2.62 kg? If you answer this could you give me an explanation of how to solve it in the future
asked by Danielle 
business
Would you invest in the company you reviewed based on the information contained in the annual report? Why or why not? Please list examples to support your answer.
asked by patricia 
algebra
How many units were produced in APRIL? What is the length of the rod AB to the nearest quarter inch?
asked by naitx 
Math
Graph the equation X = 1/2 y2
asked by Linda 
Math
Graph the line Y = 5x + 6
asked by Linda 
english
1. There should be commas around “however” in the following sentence: “Dwayne had planned to take the last flight out to Chicago. It was cancelled, however, because of bad weather.” (Points : 1) True False
asked by Sandra 
math
I need help with this problem: finding the instantaneous rate of change of y with respect to x at the point x=5 if y=x^2/2+3/5x1 I know I am suppose to find the determinant first then plug in 5...but I am not sure about the determinant
asked by Help101 
math
complete these series,1,8,27,64,___,____
asked by don 
math
complete these series,1,8,27,64,___,____
asked by don 
logic
If P is true, and Q is false, the truthvalue of "P v Q" is
asked by Anonymous 
Foreign languages
Writeacher, could you please check these sentences? Thank you. 1) I'm forwarding you the link to the requirements for next year's Comenius exchange programme. I really hope to receive some good news from you. 2) We are looking for a hotel accommodation for
asked by John 
Math
how do you solve: 4=1(2)/(x2) Thank you!
asked by Francesca 
Physics
Why "weighing" individual atoms is a particular challenge? Using A small beam arranged as a cantilever, can be utilized as part of a sensing device.
asked by Stupid Alex 
prealgebra
Evaluate showing work (23  3) ÷ (5)
asked by Anonymous 
pre algebra
(0.43  0.18) X 4 evaluate please show how its done
asked by Anonymous 
pre algebra
11  8 ÷ (1/3 + 1/5) Please show work I am stuck. Thank you
asked by toni 
math
11  8 ÷ (1/3 + 1/5) I need to know how to to this please show me. Thank you
asked by logan 
Art
Who is the artist of the Ngady Mwaash Mask (search on yah oo, then click images, it should be the 4th one) and the artist of the Sowo Mask, (same thing, go to yah oo search the name then click images, and it should be the 1st one)
asked by Anonymous 
Algebra
I'm having a problem dividing 2x^3  x^2 + 3x 1) ÷ (x + 2)
asked by Vilma 
English
What are three characteristics of a good paragraph? THANK YOU
asked by Juanita 
Chemistry
What concentration of aqueous NaOH solution freezes at negative 3.2 degrees celsius ?
asked by Mikayla 
Mergers and Acquisitions
Define a horizontal merger. How can a horizontal merger produce synergy benefits?
asked by Steven 
Mergers and Acquisitions
List the three ways that tender offer legislation protects target company shareholders?
asked by Steven 
Chemistry
1. what ion dissociates from an acid to give it its acid properties? 2. what ion dissociates from a base that gives bases their properties?
asked by hailey 
physics
what is the weight of a 3.0 kg object on the surface of the earth?
asked by Leo