Questions Asked on
June 30, 2011

PHYSICS
a 10cm long spring is attached to the ceiling. when a 2.6kg mass is hung from it, the spring stretched to a length of 15cm. what is the spring constant k how long is the spring when a 4.0 kg mass is suspended from it
asked by Kate 
physics
A game show contestant won a prize by pushing a bowling ball 20 m using her nose. The amount of work done was 1470 J. How much force did the contestant exert on the ball?
asked by micah 
physics
An initially stationary 15.0kg crate of cheese wheels is pulled via a cable a distance d= 5.70m up a frictionless ramp to a height of h= 2.50m, where it stops. What is the potential energy of the crate after it is lifted? How much work is done during the
asked by rosie 
physical science
A football player picks up.the football runs with it and throws it to a teammate, during which of these actions is work being done on the football?
asked by kesha 
physics
A 2000 kg car is moving with a velocity of 50 km/hr. What is its kinetic energy? If the car reduces its speed by half, by what factor is the kinetic energy changed?
asked by rosie 
Physics
Does the composition of an object affect the final temperature of in objects. This is in terms of thermal equilibrium.
asked by Janey 
statistics
The proportion of baby boys born in the United States has historically been 0.512. You choose an SRS of 55 newborn babies and find that 47% are boys. Do ALL calculations to 5 decimal places before rounding. (d) In a random sample of 55 newborn babies, what
asked by Ashley 
Electrotechnics N4
A circuit,consisting of 3 resistances 12,18 & 36 ohms respectively joined in parallel is connected in series with fourth resistance.the whole is supplied at 60 volt & it is found that the power dissipated in the 12Ohm resistance is 36 watt. Determine the
asked by Siboniso 
Science
The following reaction: 2SO3 (g) ! 2SO2 (g) + O2 (g) has an equilibrium constant equal to 0.23 M. If the following concentrations are present: [SO2] =0.480 M, [O2] = 0.561 M, [SO3] = 0.220 M, is the reaction at equilibrium? If not, which way must it shift
asked by Abby 
Science
Part 1 Which of the following is a redox reaction? a. H2CO3 (aq) + 2NH3 (aq) → 2NH4+ (aq) + CO32 (aq) b. 2VO3 (aq) + Zn (s) + 8H+ (aq) → 2VO2+ (aq) + Zn2+ (aq) + 4H2O (l) d. Zn(NO) (aq) + 2NaOH (aq) → Zn(OH) (s) + 2NaNO (aq) part 2 For the redox
asked by Jessica 
physics
Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance Da beyond the starting line at t=0. The starting line is at x=0. Car A travels at a constant speed Va. Car B starts at the
asked by mjLa 
Physics
Water flows over a section of Niagara Falls at a rate of 1.2×106 kg/ s and falls 50m. How many 60W bulbs can be lit with this power?
asked by Anonymous 
Homework Help ME! Science
In the reaction mechanism below, indicate what substance is acting like a catalyst. Step 1: H2O2 (aq) + I (aq) → H2O (l) + IO (aq) Step 2: H2O2 (aq) + IO (aq) → H2O (l) + I (aq) Is the catalyst in the problem above a heterogeneous or a homogeneous
asked by Emma 
Chemistry
A chemist does a reaction rate analysis on the following reaction: 2CO (g) + O2 (g) → 2CO2 (g) She collects the following data: Trial Initial Concentration of CO (M) Initial Concentration of O2 (M) Instantaneous Reaction Rate (M/s) 1 0.150 0.150 0.113 2
asked by Violet 
GRAMMAR
Question: A predicate is the part of the sentence that always contains a noun or pronoun. TRUE FALSE The predicate is one of the two main parts of a sentence  The other being the subject. The predicate is said to modify the subject. (a statement or
asked by LeslieTo:Writeacher 
physics
A force of 20 N is needed to overcome a frictional force if 5 N and accelerate a 3 kg mass across a floor. What is the acceleration of the mass?
asked by Breanna 
trig
An airplane flying at 600 miles per hour has a bearing of 152 degrees. After flying for 1.5 hours, how far north and how far east will the plane have traveled from point of departure?
asked by Anonymous 
Physics
In a simulation on earth, an astronaut in his space suit climbs up a vertical ladder. On the moon, the same astronaut makes the same climb. In which case does the gravitational potential energy of the astronaut change by a greater amount?
asked by Randylin 
Science
A chemist is studying the following equilibrium: 2Pb(NO3)2 (s) ! 2PbO (s) + 4NO2 (g) + O2 (g) He starts out with 10 g of Pb(NO3)2 and, at equilibrium, has 2.02 g of PbO. The concentrations of NO2 and O2 at equilibrium are 0.25 M and 0.019 M, respectively.
asked by Megan 
physics
A force of 99 N causes a box to accelerate at a rate of 11 m/s2. What is the mass of the box? (Ignore frictional effects.)
asked by StephyAnn 
Chemistry!
A Galvanic cell runs on the following reaction: Co (s) + Cu2+ (aq) → Co2+ (aq) + Cu (s) Draw a diagram for this Galvanic cell, labeling the electron flow, the anode and cathode, and the positive and negative sides of the Galvanic cell.
asked by Abby 
physics
A body covers 30m and 40m during 10th and 15th second respectively. The acceleration and initial velocity of the body are?
asked by mihir 
algebra II
can someone please explain how to do this problem: A twelvefoot ladder is leaning against a wall. If the ladder reaches 8 ft high on the wall, what is the angle the ladder forms with the ground to the nearest degree? 1. 36° 2. 42° 3. 48° 4. 54°
asked by ashlyn 
Chemistry
Calculate the number of C, H and O atoms in 1.75 g squaric acid. :)
asked by Anonymous 
math
Earthquakes produce several types of shock waves. The most wellknown are the Pwaves (P for primary or pressure) and the Swaves (S for secondary or shear). In the earth's crust, the Pwaves travel at around 6.5 km/s while the Swaves move at about 3.5
asked by mikeM 
ANOTHER SCIENCE
Consider the following reaction that has reached equilibrium: NH3 (aq) + C2H4O2 (aq) ! NH4+ (aq) + C2H3O2 (aq) ∆H = 102.1 kJ a. What will happen to the concentration of NH4+ (aq) if the temperature is raised? b. What will happen to the concentration of
asked by Abby 
solve the differential equation
(D24D+3)y=sin2xcosx
asked by MBU 
systemic anatomy
The superior and inferior digestive tube consists of??
asked by yao 
Chemistry
Given the following two step reaction: 4 P + 5 O2 > P4O10 P4O10 + 6 H2O > 4H3PO4 If you have 8.28 g of P, 15.65 g of O2, and 19.95 g of H2O, how many grams of H3PO4 can be produced?
asked by Bradley 
Chemistry
If you have 200 ml of a 0.1M solution of acetic acid (pka=4.75), 1. How many ml of a solution of 1.O M NaOH would you need to adjust the pH to 5.2? "Chemistry  DrBob222, Wednesday, June 29, 2011 at 8:41pm 200 mL x 0.1M = 20 mmoles. 1. ............HAc +
asked by Braydenhelp Dr. Bob 
ART 101 Art Appreciation
Discuss how art was used as a vehicle for propaganda in the works of Höch, Grosz, and Picasso.
asked by Kari 
Wealth and International Trad
Globalization and global trade have led to increased competition in world markets and increased allocation of scarce resources. Is it accurate to say that this is contributing to increased consumer surplus and reductions in inflationary pressures? If yes,
asked by Tony 
integral calculus..
Evaluate the following intergal: çMvdv , with upper limit 'v' and lower limit 'u'
asked by .. 
Math
In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to
asked by layla 
poetry
I need help determining the meter in my poem. The Ocean says, "Roar" to wake me up, And I smile as I grab my coffee cup, Because this is the day the Lord has made! I refuse to quiver and be afraid. The sunburst peeks through my window wide, And stay that
asked by Person 
HS Science
I have 4 questions 1 What is the equation for the acid ionization constant of HI? 2 Give the oxidation numbers of all atoms in NaMnO4 3 An atom changes its oxidation number from 2 to 5. Is it oxidized or reduced? How many electrons did it take to do
asked by Ashley 
business math
Term of Loan/Date of Loan using Banker's Rule? I need helps in solving this question. I have to submit it by today.Tq On 4 Oct 2010, Alia paid $8200 for his loan of $8000 made on a certain date. If the simple interest rate was 5%, determine: a)the term of
asked by Shadow of me 
AP World History Please Help Me Mrs.Sue
4.What was the nature and extent of the Umayyad Empire?
asked by Nina 
Chemistry
Write an equation (chemical or ionic) and use oxidation numbers to find out what is being oxidized and what is being reduced. (a) aluminum + oxygen (b) magnesium + steam (c) iron + dilute hydrochloric (d) copper(ii) oxide + carbon (e) bromine + potassium
asked by Click6 
History
In your own words answer each questions 150 words 1. Why are elections in the United States longer, more expensive, and more candidatecentered than in European democracies? 2. Knowing that the right to vote has been such a hardfought entitlement, why do
asked by Nene 
chemistry
i have the Mr of lead nitrate 331 and i thermally decompose it giving nitrogen dioxide and oxygen. i want to collect exactly 200cm3 of the gases evolved in a syringe. what mass of lead nitrate should i take ?
asked by linda 
physics
A 3 kg object falls from a height of 10 m. What is its velocity just before it hits the ground? How would this problem differ if the object falling from a height of 10 m only had a mass "m"?
asked by Anonymous 
algebra
the length of a rectangle is twice its width w. A second triangle, which is 8cm longer and 3 cm narrower than the first triangle, has a perimeter 154 cm. What is the dimension of each triangle.
asked by chris 
math
Find the number of round trip commuter rail tickets sold. 1.Thirty times as many round trip tickets as 12 ride tickets were sold. 2.The total number of tickets sold represented 1440 rides Example of chart below Rides per ticket x Number of tickets sold =
asked by chris 
Science
Three acids solutions have the following pH: Solution A: pH = 2 Solution B: pH = 5 Solution C: pH = 3 Which solution is made with the acid that has the smallest ionization constant?
asked by Megan 
business math
Please help me to solve the question below. An electrical appliances shop owner estimates that his sales will increase by 5% every month. The sales for the first month were $30,000. Find: a)The sales for the 10th month b)the total sales for the first year
asked by Shadow of me 
physics
Earthquakes produce several types of shock waves. The most wellknown are the Pwaves (P for primary or pressure) and the Swaves (S for secondary or shear). In the earth's crust, the Pwaves travel at around 6.5 km/s while the Swaves move at about 3.5
asked by mikeM 
chemistry
what mass of caesium nitrate will give 100cm3 of oxygen and nitrogen dioxide ?
asked by manoj 
MATH
The length of the house is 50 feet, the width is 30 feet, and from the ground to the gable (the height of the rectangle) is 10 feet. The height of the triangular prism on top is 6.5 feet.
asked by Anonymous 
algebra
a boat weighs 1500 lbs more than its motor and 1900 lbs more than its trailer. Together the boat and motor weigh five times as much as the trailer. How much does the boat weigh? Please explain or show how to set up the equation.
asked by chris 
Marketing
List and discuss the 4 P’s (marketing mix) The 4 P’s in the marketing mix consist of
asked by Destiny 
algebra
simplify 14a^8y^37a^4y^5+28a^12y^2/7a^4y
asked by marissa 
business math
How long will it take the farmer to sell all his chickens? Farmer has 2100 chickens. He sells 10 chickens at the end of the first week, 20 chickens at the end of the second week, 30 chickens at the end of the third week and so on. Question: How long will
asked by Shadow of me 
Chemistry
How many milliliters of 0.0850 M Na3PO4(aq) will react with 22.00 mL of 0.0800 M MgCl2(aq)? 3 MgCl2(aq) + 2 Na3PO4(aq) ==> Mg3(PO4)2(s) + 6 NaCl(aq) V x M = V x M (22.00mL)(0.0800M) = (0.0850M)(x) Is this the correct setup? Does it have 4 sigfigs, or am I
asked by Bradley 
physics
If a person weighs 160 pounds, and the surface area of the bottom of both feet combined is 200 cm2. What is the pressure under the person’s feet (unit: N/m2)? What is the pressure if the person stands on only one foot (unit: N/m2)? [Hint: 1 kg = 2.2 lbs,
asked by Anonymous 
Physics
In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to
asked by layla 
geometry
The hypotenuse of a right triangle is 25 cm long. One leg of the same triangle is 7 cm long. What is the length of the other leg? Explain how you found your answer.
asked by Zoey 
Statistics
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 
Math
The sum of the degree measures of the angles of a quadrilateral is 360. Find the measure of the fourth angle of each quadrilateral given the degree measures of the other three angles. 4x+12, 8x  10, 6x+5
asked by Matt 
Chemistry
When 320.62 grams of Bi2O3 react with excess of C, how many moles of Bi form? I know I need to use stoichiometry, but I can't quite seem to get the correct balanced equation.
asked by Brooke 
Chemistry
a chemist runs a chemical reaction at 25 celsius and decides that it proceeds far too repedily. As a result he decides that the reaction rate must be decreased by a factor of 4. At what teperature should the chemist run the reaction to achieve this goal
asked by Violet 
Chemistry
a chemist runs a chemical reaction at 25 celsius and decides that it proceeds far too repedily. As a result he decides that the reaction rate must be decreased by a factor of 4. At what teperature should the chemist run the reaction to achieve this goal
asked by Violet 
psy201
which strategies you could use to strengthen the relationship and describe how the relationship would be strengthened.
asked by Anonymous 
government
What was the most common religious affiliation in the 108th Congress? Protestant Jewish Roman Catholic Nonreligious
asked by stephanie 
Physics
A spherical piece of metal has a radius of .250m and a mass of 503 kg. what is its specific gravity?
asked by Angel 
trig
Evaluate the expression cos 22 degrees and sec 22 degrees
asked by Dee Mitchell 
PhysicsMath
Suppose that a car starts from rest at position 3.31m and accelerates with a constant acceleration of 4.15m/s^2. At what time t is the velocity of the car 19.2m/s?
asked by kia 
algebra
Sketch a graph of y=1/2int(x2)+1. State the domain range and intercepts. Hint: Lightly graph y=int(x) and then apply three transformations.
asked by dazzling 
finance
How do I mind out the value of this 5 oz, chunk of silver
asked by scott 
systemic anatomy
what are the portions of stomach???
asked by yao 
physics..
A physical quantity 'x'is calculated from the relation x=a^3b^2/ãcd. Calculate percentage error in x, if a, b, c and d are measured respectively with an error of 1%,3%,4% and 2%.
asked by .. 
maths..
A is 20% greater than B.What percent is B smaller than A?
asked by ... 
calculus
Demostrate that: d/dx [tan^1(x)]= 1/1+ x^2 > using implicit differentiation
asked by Mare 
maths
how does 2sin(a/2)cos(((m+1)/2)a) = sin(((m+2)/2)a)  sin ((ma)/2)?
asked by nn 
Physics
A 3 kg block is being pulled by a string at a constant speed on a surface with a coefficient of kinetic friction of 0.3. If the string is at an angle of 30 degrees with the horizontal, what is the magnitude of the force necessary to pull the block?
asked by Megan 
Chemistry
If tests are worth 90% & quizzes 10%. What is my average is my test average is a 83 & my quiz average is a 92?
asked by Diane 
physical science
the speed of light is 3*10^8 m/s. Red light has a wavelength of 7 * 10^7 m. What is its frequency?
asked by Sarah 
algebra
solve using the eliminatin method. show your work. if the system has no solution or an infinite number of solutions,state this x+y=10 xy=2
asked by Anonymous 
algebra
solve using the elimination method. show your work. if the system has no solution or an infinite number of solutions, state this x+y=10 xy=2
asked by Anonymous 
Chemistry
When hot and concentrated, sulfuric acid is a fairly strong oxidizing agent. Write a balanced net ionic equation for the oxidation of metallic copper to Cu(II) ion by hot concentrated H2SO4, in which the sulfur is reduced to SO2.
asked by Jen 
5 PreCalculus Questions
1. What is the value of x in the right triangle below? If needed, round your answer to two decimal places. 32 angle, 15 inches, find the x in base… 2. A 10foot ladder is leaning up against the side of a building so that the top of the ladder reaches the
asked by Anonymous 
Statistics
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 
physics
An 8 kg ball is moving at 4 m/s. Work is done on the ball to give it a speed of 12 m/s. What is the balls initial kinetic energy? What is the balls final kinetic energy? What work was done on the ball?
asked by Anonymous 
Education
How could you intervene to encourage further exploration of the materials based upon the children's spontaneous play?
asked by Anonymous 
differential equation
A mass 1 is attached to a spring with a spring constant 5 , which is attached to a solid mounting. A second mass 1 is attached to a spring with spring constant 6 ,
asked by hardik 
Math
Evaluate. Express each result in scientific and standard notation. (5.62 x 10^3) (16 x 10^5) and 9.2 x 10^3 2.3 x 10^5
asked by Danny 
Marketing
Discuss the universal functions of marketing and those functions that would apply to the products/services provided by a fictitious firm of your choosing.
asked by Destiny 
ethics
Are laws and regulation the problem or the solution in addressing ethical problems?
asked by Lisa 
systemic anatomy
The duodenum is divided in to.......parts, In which the major duodenal papilla is the opening of.......??? please answer ASAP confused ! p.s. i know duodenum has four parts but don't know the second blank. help!!
asked by yao 
English
I forgot to add the following statements. Thank you very much for your cooperation. 1) What did you like most among the various topics we dealt with during your school year? 2) Are you going to continue your study of English at university? 3) Are you going
asked by Henry2 
integral calculus..
Evaluate the following integral: çMvdv , with upper limit 'v' and lower limit 'u'
asked by ... 
pre algebra
Each side of the triangle shown has the same length. If the perimeter of the triangle is 49 inches, the length of each side is 3 inches. true or false
asked by hi 
historyCivil War
Upon retreating from Petersburg, were there any options open to Lee that might have prolonged the War? Please chech if my answer is correct... No, Lee retreated from Petersburg and attempted to link up with the remnants of Confed. Gen. Johnson's defeated
asked by Joanne 
geometry
Given the triangle ABC and m
asked by Anonymous 
Math 117
Find all numbers for which the rational expression is undefined.6/2v+9
asked by Gayle 
algebra
the greater of two consecutive integers is 20 more than twice the smaller. what are the integers
asked by chris 
Soc
Advocates of the death penalty recognize that no system is perfect and that applying the death penalty runs a small risk of executing someone who is innocent. Is this a price society should be willing to pay?
asked by kim 
life skills
name 3 things you like about you that makes you feel good about yourself
asked by berg 
Easy Precalculus Questions?
What is the value of x in the right triangle below? If needed, round your answer to two decimal places. 32 angle, 15 inches. A 10foot ladder is leaning up against the side of a building so that the top of the ladder reaches the top of the building. If the
asked by kalakalikalakali 
laspinas school
find out what is the cosmetologist do skin care and electrology
asked by faizalea 
English
Thank you very much. Where can I find exercises on the use of idioms, collocations and phrasal verbs? Here are some other corrections I'd like you to check. 1. To represent the unspoken activity of the mind twentycentury writers adopted the interior
asked by Henry2 
Geometry
If AB=5x+2 and AC=12x2, what is BC?
asked by Marcus 
chem
two metals both at a temperature of 25 degrees celsius are placed in separate beakers. metal A has a larger specific heat than metal B. which beaker will exhibit a greater change in temperature
asked by lynn 
englishh
Can you help me with checking meter in my poem?
asked by Person 
biochemistry
Why do you think the proximal and distal histidines are invariant between myoglobin, the alpha subunit and the beta subunit?
asked by Ashley 
Math
At a carnival,10 tickets cost $4. How much do 50 tickets cost?
asked by ehler 
Math
At a carnival,10 tickets cost $4. How much do 50 tickets cost?
asked by ehler 
Marketing
Read Chapter 21 and provide a succinct overview of the key components of a marketing plan.
asked by Destiny 
Marketing
Discuss the dimensions for segmenting markets
asked by Destiny 
English
Thank you very much for your corrections! I just wanted to know if I should evaluate these collocations as mistakes. I included some of the corrections myself. 1) Women had to provide an education to children. (Correction: provide someone with...) 2)
asked by Henry2 
maths
If the sum of the first 15 terms of an arthimetic sequence is 240. what is the 8th term
asked by anjna 
physics
A metal rod and a metal ball were submerged in a pot of water that is heated from 30°C to 80°C. At the bottom of the pot, one of the ends of the rod touches the ball. After heating the water, the ball moved. What is the final Velocity?
asked by kim 
living environment
what is an ecology?
asked by biget 
living environment
what is a biosphere?
asked by biget 
geometry
A soccer ball has diameter of 400 mm. A pin is stuck into the ball such that it creates the chord AC, which is 20 mm. What is the distance from the chord formed by the pin, and what is the length of EB? (Hint: CD=radius)
asked by Ashante 
Computer
Describe how an operating system that uses paging could make stacks grow dynamically if the original size proves too small. What would the page table data structures look like? Explain what would happen when a thread's stack grows past the area that has
asked by Danny 
math
Please Factorize it 16x2+8x1 Note="2 used after 16x is power of x"
asked by vinita mahto 
math
Please Factorize it 16*x^2+8*x1
asked by vinita mahto 
math
Please Factorize it 4*x^34*x
asked by vinita mahto 
american government
Write your own scenario of a case that would be tried in a court of original jurisdiction. Your example may be fictional, historical, or right from today’s headlines.
asked by Riah 
English
As you advised me to do, I included four sentences I was most doubtful a) 1) The daffodils grow best under the shine of trees (correction: in the shade, under the trees) 2) Time is perceived subjectively / as subjective (both possible). 3) Drunk men
asked by Henry2 
statistics
using a simple random sampling, select a sample of 12 students out of a population of 30 students comprises of 20 females and 10 males.
asked by Bekesuoyeibob 
English
In your previous post you wrote "time is perceived as subjective" so I won't evaluate it as a mistake. What do you think? I still have two more doubts. 1) The character's thougts flow freely without any temporal structures. (correction: .... freely in
asked by Henry2 
Life orientation
In 1015 lines critically discuss 5 ways in which the human or environmental problem on the community.provide relevant sources to support your claims.
asked by Panelope 
geometry
What is the measure of angle 5 if p//q, angle 1 equals 40 degrees, and angle 2 equals 80 degrees?
asked by Jenna Loving 
business
are orgainztions more risk adverse or individuals
asked by Anonymous 
geometry
The perimeter of a square garden is to be atleast 30 feet but not more than 64 feet. Find all possible values for the lenght of its sides.
asked by luli