Questions Asked on
July 10, 2013

physics
A 5.00×105kg subway train is brought to a stop from a speed of 0.500 m/s in 0.400 m by a large spring bumper at the end of its track. What is the force constant k of the spring?
asked by Anonymous 
science
The radius of the Earth is approximately 3,960 miles. Find the approximate surfaceareatovolume ratio of the Earth. A. 0.00025 B. 0.00076 C. 1,320 D. 11,880
asked by emma 
Calculus
The radioactive element polonium decays according to the law given below where Q0 is the initial amount and the time t is measured in days. Q(t) = Q0 · 2(t/140) If the amount of polonium left after 700 days is 45 mg, what was the initial amount present?
asked by Anonymous 
MATH HELP PLEASE
Polluted water from a factory flows into a pond. The concentration of pollutant, c, in the pond at time t minutes is modelled by the equation c(t)=88000(1/1000+2t) where c is measured in kg/m3. When will the concentration of pollutant in the pond reach 6
asked by FUNCTIONS 
math
Number of dinners = 125 Individual portion = 8 oz. Size of can = 32 oz. Number of cans required = I got 31.25 buttt you can't have 31.25 cans lol !
asked by sarah 
Physics
At a certain harbour, the tides cause the ocean surface to rise and fall a distance d(from highest level to lowest level) in simple harmonic motion, with a period of 12.5h. How long does it take for the water to fall a distance 0.250d from its highest
asked by Hui 
Physics
Excess electrons are placed on a small lead sphere with mass 8grams so that its net charge is 3.20*10^9C. a) Find the number of excess electrons on the lead sphere b) How many electrons are there per lead atom
asked by Rickson 
physics
A 5kg box is pushed across a horizontal floor by a 20N force that is angled 30 degrees below the horizontal. What is the coefficient of kinetic friction between the box and the floor if the box is pushed at a constant speed?
asked by chelsea 
physics
A 53.0kg person jumps from rest off a 12.0mhigh tower straight down into the water. Neglect air resistance. She comes to rest 3.00 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This
asked by sal 
physics
A small cylinder rests on a circular turntable that is rotating clockwise at a constant speed. The cylinder is at a distance of r = 12 cm from the center of the turntable. The coefficient of static friction between the bottom of the cylinder and the
asked by tom 
math
OMG I CAN NOT get this !!!! Purchase price of article = $495 Down payment = $50 Number of payments = 36 True annual interest rate = 18% Monthly payment amount = $
asked by sarah (I DON'Tget this) 
math
Loan Amount: $15,000 Method of payment: discount basis Amount of Interest : $650 Term of loan: 1 year Effective Rate of Interest (to the nearest tenth): I tried to work this out but I got it completely WRONG !!
asked by sarah 
College Algebra (Urgent)
The demand equation for a product is p = 60 – 0.0004x, where p is the price per unit and x is the number of units sold. The total revenue for selling x units is shown below. Revenue = xp = x(40 – 0.0004x) How many units must be sold to produce a
asked by Jack 
statistics
Miller (2008) examined the energy drink consumption of college undergraduates and found that males use energy drinks significantly more often than females. To further investigate this phenomenon, suppose a researcher selects a random sample of n=36 male
asked by Janice 
math
OMG I CAN NOT get this !!!! Purchase price of article = $495 Down payment = $50 Number of payments = 36 True annual interest rate = 18% Monthly payment amount = $ The formula is I= 2YC ________ M(N+1) y = the number of payments made in a year. m = the
asked by sarah 
Calculus
During a flu epidemic, the number of children in the Woodbridge Community School System who contracted influenza after t days was given by the following. Q(t) = 8000/(1+199 e^(0.6 t)) (a) How many children were stricken by the flu after the first day?
asked by Anonymous 
math
What is the unit rate? 1500 meters in 6 seconds?
asked by Jose 
Chemistry
Explain why the FeCl3KCIHCl solution was used as a reference solution. Suggest a procedure you could follow to determine whether it was necessary to use this solution as a reference or whether distilled water would have been just as satisfactory.
asked by Alyssa 
Math
A picnic cooler contains different types of cola.12 regular, 8 cherry, 6 diet, 8 caffeine free, 10 diet vanilla, and some diet cherry. U pick a can of cola without looking at its type. There is a 44% chance that the drink selected is diet. How many diet
asked by Celina 
Physics
A hollow spherical iron shell floats almost completely when submerged in water. The outer diameter is 50.0cm, and the density of iron is 7.87g/cm^3. Find the inner diameter.
asked by Hui 
physics
A 54.5kg passenger in the back seat of a van is wearing a seat belt when the van runs into a stone wall. The van is originally moving at 12.6 m/s. The front end of the van collapses 0.624 m as the van comes to rest. (a) Determine the passenger’s kinetic
asked by justin 
Math
A soccer ball is kicked from the ground. After travelling a horizontal distance of 25m, it just passes over a 2m tall fence before hitting the ground at a horizontal distance of 35m. a) Determine an equation to represent the height of the ball relative to
asked by Jennifer 
Chemistry
Suppose the solubility of PbCl2 (s) 5.6 x 10^2 M. Calculate the ksp
asked by Meg 
Chemistry
Calculate the equilibrium constant, k a reaction with delta G= 32.5 kj/mol at 25 degrees C
asked by Malikai 
business communication
can you plz correct it Howdy comrades! Shouldn’t surprise anyone that we took a beating this year, given the insane pricing moves our knucklehead competitors have been making. I mean how those clowns can keep turning a profit is beyond me, what with
asked by sara 
Chemistry
Calculate delta G of a reaction with equilibrium constant, K= 9.5 x 10^5 at 25 degrees C
asked by Matthew 
Chemistry
1. calculate the volume of concentrated HNO3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that
asked by Susan 
science
what happens when lead nitrate react with potassium hydroxide
asked by abhishek 
physics
An automobile has a mass of 2150 kg and a velocity of +18 m/s. It makes a rearend collision with a stationary car whose mass is 1850 kg. The cars lock bumpers and skid off together with the wheels locked. What is the velocity of the two cars just after
asked by GET DAT 
Chemistry Please Help!
Calculate the freezing point of an aqueous solution formed by dissolbing 4.22 g of KCl in 25.00 mL of water. Kf for water is (1.86 degree C/m). Assume density of water is 1.00 g/mL. (Hint: Use the ideal van't Hoff factor, i).
asked by Kelly 
physics
A charge of 5.4X10^7 exerts an upward .250 N force on an unknown charge .260m directly below it. What is the unknown charge?
asked by Anonymous 
differential calculus
a pc of wire 10feet long is cut into 2 pcs. one piece is bent into the shape of a circle and the other into the shape of a square. how should the wire be cut so that the combined area is as large as possible?
asked by jr 
statistic homework
suppose that a detective file in new orleans has 63 current unsolved murders. what is the probability that at least 35 of the victims knew their murders
asked by rissa 
CHEMISTRY
How to prepare a 500ml 0.2M NaOH solution from 2.0M NaOH solution
asked by RICHARD 
Biology
1. A theory and a hypothesis are different in that: A. you must have a theory before you can form a hypothesis. B. a theory is developed as a result of broad agreement among scientists and a hypothesis is a much less substantiated idea. C. a theory is much
asked by Amy 
Chemsitry
Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=40.0 degree C/m
asked by Kelly 
math
nemo is swimming 47 feet below sea level . he ascends 16 feet in the water . what is nemos current position ?
asked by LESLIE 
Physics
Calculate the vertical distance an object dropped from rest covers in 12 seconds of free fall. (The unit of measure for distance is the meter, written as m.)
asked by Carlos 
British Literature
what is the theme of mary, lady chudleight's poem "to the Ladies>" what advice does she give to women
asked by Linda 
Chemistry
If the solubility of CaF2 (s) in water is 5.0 x 10^3. The solubility will be A. The same in 0.10 M NaF B. less than 0.10 M NaF C. Higher in 0.10 M NaF D.None of the above
asked by Morgan 
Algebra 2
At 1:00 a.m., a homicide detective found the reading of a corpse's body temperature to be 88 degrees Fahrenheit. One hour later, the body temperature is 83 degrees Fahrenheit. If the body has been in a 74 degree Fahrenheit room since its death, what is the
asked by Anonymous 
Chemistry Please Help!!
Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation. mass of unknown: 0.195 g Tf(camphor)= 179.8 degree C Kf(camphor)=40.0 degree C/m
asked by Kelly 
Please help with Calculus problem??
A particle moves with a fixed acceleration 3 m/s^2. If its initial velocity is s(0)=0: a) Find its velocity function. b) How long does it take for the particle to reach the velocity 14 m/s^2? c) Find the distance the particle traveled when its velocity
asked by Robin 
Physics
Suppose this dude wants to be able to touch the rim of a basketball goal. The rim is 3.048 m above the ground. The dude can reach up 2.45 m with his feet on the ground. (a) If the dude can achieve a liftoff speed of 2.80 m/s, what is his maximum upward
asked by xavier 
physics
In the figure the man hanging upside down is holding a partner who weighs 535 N. Assume that the partner moves on a circle that has a radius of 6.50 m. At a swinging speed of 3.75 m/s, what force must the man apply to his partner in the straightdown
asked by simon 
math
a plumber has 12 1/2 feet of plastic pipe he uses 3 2/8 feet for the sink line and 5 3/4 feet for the washing machine . he needs approximately 3 1/2 feet for a disposal. does he have enough pipe left for a disposal?
asked by LESLIE 
Chemistry
Calculate the ph of a buffer made from 0.25 m NH4Cl and 0.42 M NH3. Kb= 1.8 x 10^5
asked by Michelle 
chemistry
to what volume should you dilute 0.100L of a 15M NaOH solution to obtain a 1.0M NaOH solution
asked by veronica 
math
Joe and Sam went to a canoe rental store. the sign read "canoe rentals: $10 canoe insurance fee plus $15 per hour". Joe and Sam wanted to know how much it would cost for them to rent the canoe for different numbers of hours, so they made a table and
asked by Amy 
Social Studies
It can be said that one of the greatest contributions of the Moors was religious tolerance. Do you believe that is true? If so, why is it then that some people view Muslim culture to be a culture of intolerance?
asked by Sarah 
Business Communications  English 101
In this paragraph, any errors on capitalization, commas or semicolons? Also, should "they are all to report directly to me be part of the next sentence instead of the first sentence? Thanks again! Howard Clark will be the supervisor for the third shift,
asked by MaryBeth 
chemistry
1. calculate the volume of concentrated HNO_3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO_3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that
asked by khadijah 
ETH/125
2.Sociologists point out that gender differences are maintained through a. systematic socialization. b. the legal system. c. the class system. d. biological differences. i am torn between a & d
asked by beckylynn 
Bio
1. An isotope is an atom of an element that varies in mass number due to variation in the number of: A. atoms. B. protons. C. neutrons. D. electrons. is it C 2, A covalent bond is: A. the attraction that one atom has for another atom. B. the attraction
asked by Amy 
Com200
One reason language is so powerful is that it is the means by which you construct your reality. T or F I believe the answer is true.
asked by Michelle 
Physics
A 17000 kg railroad car travels along on a level frictionless track with a constant speed of 23.0 m/s. A 5100 kg additional load is dropped onto the car. What then will be its speed in meters/second?
asked by Zach 
math
a group of hikers begin their expedition at the grand canyon at an elevation of 56 feet below sea level at 5:00 am .if they climb 14 vertical feet up each hour until 10:00 am ,what is their new elevation ?
asked by LESLIE 
Geometry, Help
Compare and Contrast Describe the difference between saying that two segments are congruent and saying that two segments have equal length. When would you use each phrase?
asked by Unknown 
Geography
which layers of the earth move? Why do ther move?
asked by Anonymous 
SCIENCE,PHYSICS
According to the legend, Zeus, the king of ancient Greek gods, had the power to create thunderbolts in his hands and throw them at his opponents. Suppose Zeus creates the thunderbolts by bringing his palms very close together and parallel to each other and
asked by GT 
English; Help/Check.
Leprechauns and Fairy's; Leprechauns are fairylike mischievous creatures in Irish folklore. They are in a form of a old man. Leprechauns have been reported to be no bigger then a small child or no bigger then a finger. If they are spotted by human they
asked by Unknown 
Maths
When the angle of elevation of the sin55 a tower cast a shadow 20m long. Find the height of the tower
asked by Alexander 
math
(3/2)(1/3+ 1) (2+7/4)(7/4)(7/4) > / that stands for a fraction
asked by LESLIE 
Math
Find the probability that a number chosen at random between 1 and 100 is divisible by 2 and 7.
asked by Celina 
Physics
You’ve purchased two identical violin strings. You install one of the strings in a conventional violin; the other string you stretch between two posts, each attached to rigid concrete pillar in the open air. Both strings are made of the same materials,
asked by Anonymous 
science
The greatest height to which a man can throw a stone is H.what will be the greatest distance upto which he can throw the stone?
asked by Aanchal 
algebra1 HELP PLEASE Thanks you!!
Find the relative minimum of y = 3x^3 + 14x^2  10x  43 Round your answers to the nearest hundredth.
asked by lisa 
history
Akber became emperor at only thirteen years of age. Research his reign. What were his greatest achievements as emperor?
asked by leena 
math
For every positive integer n, consider all monic polynomials f(x) with integer coefficients, such that for some real number a x(f(x+a)−f(x))=nf(x) Find the largest possible number of such polynomials f(x) for a fixed n
asked by GT 
chemistry
If you have 156g of SO2, how many molecules do you have?
asked by Erin 
physics
In the drawing, the weight of the block on the table is 380 N and that of the hanging block is 175 N. Ignore all frictional effects, and assuming the pulley to be massless. What is the acceleration of the two block?
asked by rex 
Bio
1. A control group differs from an experimental group: A. in the number of test organisms used. B. by the independent variable. C. in several ways. D. in no way. is it A 2. A theory and a hypothesis are different in that: A. you must have a theory before
asked by Amy 
Data management gr.12
Find the probability that a number chosen at random between 1 and 100 is divisible by 2 and 7.
asked by Celina 
physics
A 33kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 195 J from 425 J. How high does she rise during this interval? Neglect air resistance.
asked by jimmy 
math
When I worked this problem out I got the answer $250.80. It was graded wrong. Can you explain what I did wrong. A deposit of $8,000 at 9.5% for 120 days $
asked by sarah 
physics
The rate of energy use in a typical house is about 2.0 kW (2.0 × 103 W). If the kinetic energy of a 1400kg car is equal to the total energy used by the house in 1 min, what is the car’s speed?
asked by SIMONAAA 
history
under Franklin Roosevelt's Good Neighbor policy,
asked by babeth 
Calculus
Solve dy/dx for sin(xy)=1+x^3y^2
asked by C 
SCIENCE
why is a hydrogen molecule (H2) more stable than two individual hydrogen atoms?
asked by Drake 
Algebra 2
A gas station is giving away free glasses with 5 different designs. What is the probability of collecting all 5 in 15 visits to the gas station?
asked by Anonymous 
English
1. It is strange for her to receive fan letters. 2. It is strange of her to receive fan letters. 3. She is strange to receive fan letters. 4. For her to receive fan letters is strange. 5. Fan letters are strange for her to receive. (Which ones are
asked by rfvv 
Business Communications  English 101
This is one paragraph in an interoffice memo. Should it be a semicolon instead of two separate sentences? Also, it is an interoffice memo, should company be capitalized? Thanks! Ed, I have made several changes to our staff to help accommodate the
asked by MaryBeth 
heeeeeeelp math3
For every positive integer n consider all polynomials f(x) with integer coefficients, such that for some real number a *x(f(x+a)−f(x))=n*f(x) Find the largest possible number of such polynomials f(x) for a fixed n
asked by lin 
chemistry
In my experiments I mixed different ratios of CuSO4 and NaS. The ratio in which I had the greatest amount of precipitate was when I mixed 3mL CuSO4 : 3mL NaS. Now my question: What is indicated by the maximum amount of precipitate...? Thanks in advance.
asked by Michelle 
algebra1 HELP PLEASE Thanks you!!
Write a polynomial function in standard form with zeros at 6, 4, and 1
asked by lisa 
math
A. In triangle, the second angle measures twice the first, and the third angle measures 5 more than the second. If the sum of the angles' measures is 180^0, find the measure of each angle. b. The price of a pack of gum today is 63 cent. This is 3 cent more
asked by gary 
math
Trahen is building a fence that is 6 feet high and 18 feet wide to put around his garden. He has two sizes of boards that he can use. One is 2 feet by 6 feet and the other is 4 feet by 6 feet. Trahen can put the boards either horizontally or vertically and
asked by GT 
math
The squares of a 3×3 grid are filled with nonnegative integers such that the sum of each row and the sum of each column is 7. How many different ways can the squares be filled? Details and assumptions The numbers in each grid square does not need to be
asked by GT 
history
write a short note of 170180 words on the travelling experiences of 'James Cook'
asked by leena 
math
The length of a table is 4m longer than the width. The are is 77m^2. Find the dimensions of the table. l=w+4 w=l4? I'm stuck?
asked by Monica 
Chemistry
The solubility of AgCl (s) is 2.5 x 10^5 M. calculate the ksp
asked by Mike 
Chemistry
If the solubility of CaF2 (s) in water is 5.0 x 10^3 M. The solubility will be
asked by Morgan 
Chemistry
A couple questions here: 1. How do you expect nitriding to change the properties of iron? a) Nitriding makes iron stronger. b) Nitriding makes iron weaker. c) Nitriding makes iron more electrically conductive. d) Nitriding makes iron less electrically
asked by Sara 
Math
Three times a number is the same as that number subtracted from 12. What is the number? A) 6 B) 2 C) 2 D) 3 E) 4 I don't get what the question is asking Its a little confusing
asked by Candy 
math
When I worked this problem out I got the answer $250.80. It was graded wrong. Can you explain what I did wrong. A deposit of $8,000 at 9.5% for 120 days $
asked by sarah 
Physics
Steps for drawing an acceleration time graph from a velocity time graph and vice versa?l Please give me proper steps
asked by Lance 
math
MS.powell has $25 in her checking account after withdrawing money from the atm .How much did Ms.Powell withdraw if she had $85 in her checking account before she withdraw the money?
asked by LESLIE 
math
the temperature in the desert can drop as much as 40'f from noon to midnight .At noon on july 31st the temperature in sahara desert is 3'f .If th temperature drps 39'f by midnight , what is the temperature at midnight ?
asked by LESLIE 
math
15 − 4 + (7 − 5)^2
asked by nene 
Algebra 2
Palmer and teller go to the local ice cream parlor after work that offers 40 flavors of ice cream. Palmer wants a cone with chocolate mousse on top, cherry truffle in the middle, and double Dutch chocolate on the bottom. Teller wants a dish with
asked by Anonymous 
Geometry
1.Explain why we use the formula AB = a  b to find the distance of a segment. Include why you need to subtract and why you need to take the absolute value. The formula for finding vector AB is AB = b  a where a and b are the position vectors OA and OB
asked by Unknown 
eth/125
Sociologists point out that gender diffrences are maintained through a.systematic socialization b.the legal system c.the class system d. All of these
asked by beckylynn 
heeeeeelp math
A subset S of {1,2,…,n} is said to be packed if whenever i,j∈S the number ⌊(i+j)/2⌋ is also in S. Determine how many subsets of {1,2,…,25} are packed. Details and assumptions i and j need not be distinct. If i=j is in the set, then clearly so is
asked by lin 
heeelp math2
Find the number of polynomials f(x) that satisfy all of the following conditions: f(x) is a monic polynomial, f(x) has degree 1000, f(x) has integer coefficients, f(x) divides f(2x^3+x)
asked by lin 
College 103 Chem
How many grams of Sodium Phosphate would you need to make 225ml of 8.00M of stock solution? Thank you
asked by Andrew 
heeeeeeeeelp math
A subset S of {1,2,…,n} is said to be packed if whenever i,j∈S the number ⌊(i+j)/2⌋ is also in S. Determine how many subsets of {1,2,…,25} are packed. Details and assumptions i and j need not be distinct. If i=j is in the set, then clearly so is
asked by lin 
Math
A basketball team won 10 of its first 20 games. If then won its next 5 games. What fractional part of its total number of games did it win?
asked by Mohammed 
science
explain the comment ''your brain makes you, you''
asked by leena 
math
How many integers from 1 to 1000 (exclusive) are divisible by the cube of an integer larger than or equal to 2?
asked by cao 
SCIENCE,PHYSICS
Exact solutions for manybody problems are rarely encountered in physics. The following problem deals with a nontrivial motion of four charges. Due to the symmetry of the problem it is possible to determine the trajectories of the charges analytically.
asked by GT 
SCIENCE,PHYSICS
A boy is spinning on a chair and holding a paper bag so that it is horizontal, and perpendicular to the axis of the rotation. What should be the angular velocity of the boy in radians/second so that the bottom of the bag breaks? Details and assumptions
asked by GT 
SCIENCE,PHYSICS
A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in
asked by GT 
English
How are leprecuans different or similar to the fairies in A Midsummer Night's Dream?
asked by Unknown 
science
two bulb are marked 60 w,220v and 100w,220v.which one of the two will glow brighter?
asked by dhilip 
Bio
1. Pseudoscience and nonscience differ in that: A. nonscience is not valuable and pseudoscience is valuable. B. pseudoscience deceives, misleads, or misinforms and this is not a primary characteristic of nonscience. C. nonscience forms hypotheses and
asked by Amy 
Chemistry
A buffer is made from 0.20 M sodium acetate and 0.20 acetic acid. Ka=1.8 x 10^5. The ph is
asked by Melanie 
Economics
According to the U.S. Constitution and judicial review, each person's individual rights guaranteed by the 1st Amendment are absolute, meaning that there are no limits to your rights. True Or False
asked by Mesha 
finance in healthcare
Where can I find some information about this? Most of the class is talking about the costs of health care I would like to do something different. I need to find two current health care financial problems and how they overcame the problems and how effective
asked by Mary 
Biology
Which is NOT a major function of proteins? A. Provides cell structure B. Stores energy for the cell C. Functions as regulator molecules in cellular activity D. Functions as carrier molecules is it D
asked by Amy 
alg 1
6(4) ÷ 2 − 1 + 5 I don't understand how to do it step by step
asked by ty 
Algebra 2
3x6 >= 2 Is this correct? x>=16/3 x
asked by Anonymous 
alg 1
2x − 2y − 5z + 2x + 2y + 3z
asked by john 
SCIENCE
why is a hydrogen molecule (H2) more stable than two individual hydrogen atoms?
asked by Drake 
alg 1
−3(d − 3) + 5d
asked by alley 
alg
−(6p + 12
asked by bill 
alg
5x10/5 ?
asked by bill 
Physics
For each of the following scenarios, indicate whether the oscillation period of the pendulum becomes shorter, longer or remains unchanged. Note: you must clearly mark your answer (for example, highlight it in red) from the multiplechoice list below and
asked by Anonymous 
Calculus
The number of online buyers in Western Europe is expected to grow steadily in the coming years. The function below for 1 t 9, gives the estimated buyers as a percent of the total population, where t is measured in years, with t = 1 corresponding to 2001.
asked by Anonymous 
Physics
The function y(x,t) = (15cm )cos(pi x 15t pi), with x in meters and t in seconds, describes a wave on taut string. What is the transverse speed for a point on the string at an instant when that point has the displacement y=+12cm?
asked by Hui 
physics
calculate the energy consumed by a computer(150 W) that is used for 2.0 hours and a laser(250 W) that is used for 10 min? Answer is 1.2 Mj
asked by justin