
chemistry
a piece of iron reacts with sulfuric acid and produces 250 dm^3 hydrogen gas at 27 degree celsius temperature and 99.99 kPa. Find out the mass of that piece of iron?
asked by tazvi on July 3, 2012 
physics
the earth (mass=5.98x10^24kg) rotates around the sun in a orbit that is approximately circular, with a radius of 1.5x10^11m find the orbital speed of the earth around the sun
asked by peter on November 8, 2010 
physics
A uniform plank AB which is 75m long and has a weight of 350N and is supported horizontally by two vertical ropes A and B. A weight of 100N rest on the plank at C where AC=4m. Find the tension in each rope A and B
asked by atiyya on November 19, 2016 
Calc
A particle starts at the point (−3, 0), moves along the xaxis to (3, 0), and then along the semicircle y = sqrt(9 − x^2) to the starting point. Use Green's Theorem to find the work done on this particle by the force field F(x, y) = .
asked by Taylor on November 8, 2016 
economic
find the competitive price and quantity (as if the above marginal cost curve represents the market supply curve. given the market demand equation P=100.1Q and TC=1000+20Q+.4Q^2
asked by sam on August 30, 2016 
algebra
An artist intends to paint a 98squarefoot mural on the large wall show below. Find the dimensions of the mural if the artist leaves a border of uniform width around it.
asked by f on March 21, 2014 
Science
A 110.0 kg box is pushed by a horizontal force F at constant speed up a frictionless ramp which makes an angle of 35.0 deg with the horizontal. Find the magnitude of the applied force F.
asked by Mark on October 26, 2011 
algebra
A restaurant meal for a group of people cost $85 total. This amount included a 6% tax and an 18% tip, both based on the price of the food. Which equation could be used to find f, the cost of the food
asked by hannah on October 24, 2013 
uniben
A rubber ball is dropped from a height of 10meters,suppose it rebounds onehalf the distance after each fall.find the total distance the ball travels before coming to rest.
asked by wilfred on April 29, 2012 
Math 7
find the surface area for the given cylinder. I have to use 3.14 and round to the nearest whole number. The radius is 6ft and the height is 20 ft. A. 180 ft2 B. 720 ft2 ** C. 433 ft2 D. 135 ft2
asked by LILO on March 1, 2017 
Algebra
A rectangular mall located between two parallel streets is 50ft wide and 200yd long. Find the area. I got 10000. But 10000 what? Should it be ft squared or yd squared? I'm confused on this which is it supposed to be?
asked by Anonymous on September 15, 2007 
human services
Can you tell me where I might find the information for this question. Summarize the Requirements of the Kaizen System A. Identify technical and human requirements for implementation B. Guidelines for reducing issues in the implementation process
asked by patiance on August 14, 2011 
geometry
A rectangular playing field is 3 times as long as it is wide. its area is 2500 metres squared. find the cost of fencing in the field if the fencing costs €15 per metre
asked by Anonymous on October 26, 2011 
health
i need some sites on then few questions i cant find anything on this can someone help me ?.... thanks! Government role and level of effect: national, state, and local Identify the government structure. Discuss the function and role for this issue
asked by bobbi on September 17, 2011 
Calculus
27 ft of wire is to be used to form an isosceles right triangle and a circle. Determine how much of the wire should be used for the circle if the total area enclosed is to be a maximum? I can only find the minimum because the parabola is opening upward
asked by H on November 11, 2013 
Physics
The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = 5 x 109 C placed at corner A and then at
asked by Anonymous on February 10, 2013 
Chem
One of my questions asks me to find the volume of neon gas. I thought neon didn't attach with other atoms because it had a full valence shell, how would it form into a gas? What would the formula be? N2, N3 ?
asked by Lena on July 6, 2009 
Chemistry
Jack drives 6.45 km to work and his car gets about 0.0147 km per gram of gasoline. Using the balanced chemical equation (you need to find out this equation by yourself), how many grams of CO2 is produced in this trip to work
asked by Kitty on January 16, 2012 
PreCalculus
Given that SIN Theta = 1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta. I'm not sure how to properly square the 1/sqrt10 and keep an exact answer other than decimal. Otherwise, my final answer is 1.632455533
asked by Joe on July 13, 2011 
physics Sound PLEASE HELP ASAP!!! PLEASE
The 2nd harmonic of a string of length 60 cm and linear mass density 1.1 g/m has the same frequency as the 5th resonance mode of a closed pipe of length 0.8 m. Find the tension in the string.
asked by Shek on March 2, 2014 
math
A copper sphere of a radius 5 cm is immersed inside a cylindrical container.If the base radius of the container is 7 cm, find the rise in water level, correct to 1 decimal place
asked by Cathrine on April 26, 2019 
maths
If the length of the fence of a trapezium shaped field ABCD is 130m and side is perpendicular to each of the parallel side AD and BC.if BC=54m ,CD=19m and AD=42m, find the area of the field.
asked by manu on February 16, 2015 
physics Sound
The 2nd harmonic of a string of length 60 cm and linear mass density 1.1 g/m has the same frequency as the 5th resonance mode of a closed pipe of length 0.8 m. Find the tension in the string.
asked by Help please as soon as possible please!!!! on March 2, 2014 
chemistry
a piece of iron reacts with sulfuric acid and produces 250 dm^3 hydrogen gas at 27 degree celsius temperature and 99.99 kPa. Find out the mass of that piece of iron?
asked by tazvi on July 3, 2012 
calculus
Find a number x0 between 0 and pi such that the tangent line to the curve y = sin x at x = x0 is parallel to the line y = x=2. I get that for both lines to be parallel to each other their slopes need to be the same. I found 1/2 = cos(x) but I get stuck
asked by asdf on December 1, 2012 
Chemistry@DrBob222
I apologize for having to bother you again,but I still can't post follow up questions and I can't find the reason.I even tried reinstalling the browsers,and still the same. Anyway you responded to my last post regarding H2 O2 fuel cell, "I agree". So did
asked by Shenaya on July 30, 2017 
algebra
Find the future value of an ordinary annuity. Payments are made and interest is compounded as follows: R=600 7% interest compounded quarterly for 5 years I set this up as follows and still am getting the wrong answer: 500 (1.07)^51/0.07 Please help!!
asked by Beth on December 15, 2011 
Chemistry
Use activity coefficients to find the concentration of hydrogen ions in a solution of 70.0 mM butanoic acid and 0.1 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 105. Take the size of C3H7COO– to be 500 pm.
asked by amanda1012 on September 29, 2012 
UNION UNIVERSITY
Find the Z score for the weights of Middle school boys which are approximately Normal, mean = 130 lbs, Standard Deviation = 7, if Johnny weighs 148 lbs, What's his Z score?
asked by SAMANTHA on November 12, 2014 
Math
in a changing room, lockers are assigned the numbers 1,2,3,…, up to 99. If a locker is selected at random, find the probability that the locker number is A) a multiple of 5 B) a positive square number C) greater than 99
asked by Ledyyyy on February 13, 2016 
maths
for a particular stretch of road it is estimated that on average one car in ten exceeds the speed limit. on a particular day 2003 cars use that stretch of road. use a suitable approximation to find t
asked by harish on May 16, 2013 
themodynamics
liquid water of mass 10 kg & temperature 20 degree celsius mixed with 2 kg of ice at 5 degree celsius till equilibrium is reached at 1 atm presssure . find entropy ??
asked by vishal on November 12, 2014 
Algebra
If an object is thrown upward with an initial velocity of 96 feet/sec, it's height after t sec is given by h=96t16t^2. Find the number of seconds before the object hits the ground.
asked by Sharon on July 30, 2010 
Math
The ages of three siblings combined is 27. The oldest is twice the age of the youngest. The middle child is 3 years older than the youngest. Write and solve an equation to find the ages of each sibling.
asked by Cheyanne on April 3, 2016 
Math
The demand and supply equations for a certain item are given by D = 5p + 40 s = p^2+30p8 Find the equilibrium price. Wouldn't you set demand equal to supply, and solve for P? I will be happy to critique your work.
asked by Audrey on June 10, 2007 
Molarity
Find the molarity of a salt water solution containing 0.27 mol NaCl in 150g of H2O. My work: 0.27 mol NaCl/150 g x 1000g/1kg = 1.8 M is this correct, i wasn't really sure what to do...
asked by Janice on November 12, 2009 
Math
Can you help please on the following question: "The sum of the lengths of the legs of a right triangle is 8 feet. If the length of the hypotenuse is 6 feet, find the length of the shorter leg to the nearest tenth of a foot." Thank you, Cassandra
asked by Cassandra on April 18, 2015 
Algebra 2
I need to find x of the quadratic function y=5/3x^2x4. I'm supposed to use the formula x=b/2a. The negative sign only applies to b. A=5/3 and B=1. When I substitute these values in I get (1)/2(5/3). After working this out I get 1 over 10 over
asked by Krystal on September 2, 2013 
mathProbablity
A golfer makes 80% of her putts from a distance of 5 metres or less from the hole. In order to calculate the probability that she would make 23 out of 27 putts or better on a given day, what boundary value should be chosen for X in order to find the
asked by Angle on June 5, 2012 
physics
The electric motor of a model train accelerates the train from rest to 0.780 m/s in 33.0 ms. The total mass of the train is 510 g. Find the average power delivered to the train during its acceleration.
asked by Anonymous on October 11, 2011 
Algebra
The Johnsons framed a family picture to hang on the wall. The length of the frame is 22 inches and the width is 14 inches. Use the formula to find the perimeter of the frame. Show your work.
asked by Peach on May 23, 2015 
english
I need help finding a good website that tells how dracula by bram stoker is a literary success. Also awards that Bram Stoker has received. I tried typing it in the search bar and i cant find anything. please help me!
asked by trista on January 11, 2009 
math
The height of an open box is 1cm more than the length of a side of its square base.If the open box has a surface area of 96cms,find the dimensions using quadratic equation
asked by shani on June 22, 2016 
Geometry
Points X, Y, and Z are on sides AB, BC, and CD, respectively, of square ABCD. Let O be the intersection of the diagonals of ABCD. Segments XO , YO, and ZO divide the square into three parts with equal areas. If Y is the midpoint of BC,find AX/XB. I'm not
asked by Rahi on January 11, 2017 
phyics
The position of a 2.75 *10^5 N training helicopter under test is given by r = (0.020 m/s^3)(t^3)i + (2.2 m/s)(t)j  (0.060 m/s^2)(t^2) k Find the net force on the helicopter at t =5.0s. Express your answer in terms of i,j,k. Express your coefficient using
asked by ami on September 16, 2010 
AP Calc
A rational function f(x) contains quadratic functions in both the numerator and denominator. Also the function f(x) has a vertical asymptote at x=5, a single x intercept of (2,0) and f is removeably discontinuous at x=1 because the lim x> 1 is 1/9. Find
asked by Alex on August 21, 2017 
algebra
Mary has a total of $5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was $331. Write and solve a system of equations to find out how much she has invested in both accounts.
asked by billy on March 4, 2014 
Fizik
a car travels with velocity along a straight horizontal road . if the coefficient of static friction between the tyres and the road is us . find the shortest distance travelled by the car before it stop
asked by Hasliza on November 17, 2016 
math
If $15,000 is invested at an interest rate of 10% per year, compounded monthly, find the value of the investment after the given number of years. (Round your answers to the nearest cent.) a. 6 years b. 12 years c. 18 years
asked by Marie P. on August 14, 2014 
Chemistry
In my problem i need to find the mass of Ag in AgNO3. I have 3.489g of AgNO3. Help please! Determine the percentage composition from the formula. PercentAg= atomicmassAg/molmassAgNO3 Then, mass Ag= 3.489 * decimal percent above.
asked by Jason on January 28, 2007 
physics
A gasoline engine absorbs 20990 J heat and performs 4166 J mechanical work in each cycle. Find the amount of heat expelled in each cycle. Answer in units of J
asked by Anonymous on April 19, 2013 
Statistics
Opinion polls find that 13% of Americans "never have time to relax." If you take an SRS of 543 adults, the approximate distribution of the number in your sample who say they never have time to relax will be binomial with parameters: n= p=
asked by Johnny on November 1, 2012 
Algebra 2
A rain gutter is made by bending up the edges of a piece of metal of width 36 in. If the length of the piece of metal is 24 in., find the height that maximizes the volume. I need all of the steps to get to the answer.
asked by Brandon on April 22, 2011 
Physics
A block slides from rest from the top of a plane 8m long and inclined 35o with the horizontal. If the coefficient of friction is 0.20, find how long it will take the body to reach the bottom of the plane.
asked by Dan Ira King on November 26, 2017 
physics
The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = 4.35 108 C placed at corner A and then
asked by Natasha on July 4, 2012 
math
For each speed, find how much time it will take the students to reach these cities on their route: 1. Atlantic City, New Jersey, about 320 miles from Norfolk. 2. Baltimore, Maryland, about 3/4 of the way from Norfolk to Atlantic.
asked by mazia on October 9, 2008 
Precalculus
Write the standard form of the equation of the circle that is tangent to x= 2 and has its center at (2,4). Answer:(x2)^2+(y+4)^2=16 Is this correct? 2) Find the area of the region between the graph of y=x^3 and the xaxis from x=1 to x=4 Answer: 63 3/4
asked by Lucy on September 29, 2008 
Physics
A current of 4 A flows in a copper wire 10 mm in diameter. The density of valence electrons in copper is roughly 9 × 1028 m−3. Find the drift speed of these electrons. Answer in units of m/s.
asked by Aj on November 1, 2012 
ACC250
This week you learned how to start and back up Peachtree software and you had the opportunity to explore some of Peachtree’s features. What was the most challenging aspect of the material covered this week? What did you find most beneficial?
asked by Anonymous on September 17, 2008 
Physics
The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = 7.00 109 C placed at corner A and then
asked by Anne on January 30, 2012 
Calculus I
a). Find the critical points of the following functions on the domain or on the given interval. b). Use a graphing utility to determine whether each critical point corresponds to a local minimum, local maximum, or neither f(x)= x tan^1 x
asked by Mjeed on November 4, 2015 
BIOLOGY/EARTH SCIENCE
Hi, I was just wondering how an eroding dune and a noneroding dune would differ, in terms of diagrams. For example, is there any site that would compare two crosssectional shapes of the dunes? I couldn't find any on google.
asked by Kelly! on October 18, 2007 
trigonometry
A barge is being towed south at the rate 2 km/hr. A man on the deck walks from west to east at the rate 4ft/s. Find the magnitude and direction of the man's actual velocity.
asked by karl on August 7, 2014 
earth science repost!!!
Hi, I was just wondering how an eroding dune and a noneroding dune would differ, in terms of diagrams. For example, is there any site that would compare two crosssectional shapes of the dunes? I couldn't find any on google.
asked by Kelly! on October 18, 2007 
math
John forgot to pay his $364 income tax on time. The IRS charge a penalty of 12% for the 55 days the money was late. Find te penalty that John paid
asked by Anonymous on November 22, 2010 
physical
a police siren emits a sinusoidal wave with frequency f=300hz.the speed of sound is 340ms. find the wave lenght of the waves if the siren is at rest in the air
asked by eric on February 16, 2011 
Physical Science
Find the hydroxideion concentration in an aqueous solution when the hydroniumion concentration is 1×10^−10M. Recall that 10^a×10^b=10^(a+b). Express your answer to one significant figure and include the appropriate units.
asked by Hannah on March 15, 2017 
physics
An airplane is traveling 675 km/h in a direction 42.5° west of north (a) Find the components of the velocity vector in the northerly and westerly directions. b) How far north and how far west has the plane traveled after 3.00 h?
asked by joe on September 30, 2012 
physics
an electron inside spherical metallic particle of volume 10^ 12 metre cube has a kinetic energy about 10 eV. use uncertainty relations to find relative uncertainty in electron velocity
asked by prerana on September 29, 2013 
physics
The equation of motion of a simple harmonic oscillator is given by x(t) = (9.0 cm)cos(12πt) − (5.4 cm)sin(12πt), where t is in seconds. (a) Find the amplitude. Determine the period. (c) Determine the initial phase.
asked by Anonymous on April 29, 2018 
algebra
Mary has a total of $5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was $331. Write and solve a system of equations to find out how much she has invested in both accounts
asked by ann on March 26, 2014 
Maths
Peter buys AC at 900. He pays 20% deposit and the outstanding balance plus interest in 48 months. Interest on the balance is charged 10%. Find the amount he saves by paying cash
asked by Anonymous on January 28, 2018 
Math
The height of a parallelogram with an area of 300 square yards and a base of 15 yards and 1 more question A rectangle has verticles W(2,3) X (2,6) Y(7,6) and Z(7,3) Describe how to find the side lengths of the rectangle without graphing
asked by Dj on March 6, 2013 
Physics
A 1550 kg car moves on a horizontal curved road. If the radius of the curve is 46 m and the coefficient of friction between the tires and road is 0.1, find the maximum speed the car can have so that it may not skid.
asked by Anonymous on November 8, 2014 
POLYNOMIALS
The cubic polynomial f(x) is such that the coefficient of x^3 is 1. and the roots of the equation f(x) = 0 are 1, 2 and k. Given that f(x)has a remainder of 8 when divided by (x3), find the value of k. okay, this is what i did: x^3 + bx^2 + cx + d =
asked by Aoi on June 15, 2009 
Math
Two coins are taken at random (without replacement) from a bag containing 7 nickels, 5 dimes, and 6 quarters. Let X denote the random variable given by the total value of the two coins. Find E(X). (Round your answer to four decimal places.)
asked by Cecylia on March 5, 2010 
Science
where can I find info on diseases of the circulatory system??? Please help!!!! http://en.wikipedia.org/wiki/Cardiovascular_disease Please help! I need a good website for heat in science! I'm in 8grade and I need info on heat
asked by Tarissa on January 3, 2007 
physic
a stone A is dropped from the top of tower and B is thrown downward from same point 2 seconds later with initial velocity of 30 ms , if the same stone A and B reach the ground at same time, find height of the tower
asked by Apoorva on July 25, 2014 
Math Trigonometry
A bus driver driving south along a highway is 16 km from the nearest city. After traveling a distance of 32 km, the driver finds he is 19 km away from the same city. Find the bearing of the town from the second position of the motorist.
asked by Daniel on March 4, 2016 
math
police officer johnson is 6.2 ft tall and casts a 2.3 ft shadow. at the same time. his nearby car casts a shadow which is 12 ft long. write a proportion to find the hight of the SUV.
asked by ANNONIMUS on November 29, 2012 
AP Statistics  Chapter 6
A quiz consists of 20 multiplechoice questions, each with 6 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 50 %. P(pass)=
asked by Robert Stewart on November 18, 2016 
physics
A truck travels 1710 m uphill along a road that makes a constant angle of 5 . 08 ◦ with the horizontal. Find the magnitude of the truck’s horizontal component of displacement. Answer in units of m.
asked by allan on January 19, 2015 
Algebra
Mary has a total of $5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was $331. Write and solve a system of equations to find out how much she has invested in both accounts.
asked by Steveo on March 3, 2014 
Pre Calc
Find the work done by a force F of 30 pounds acting in the direction (2,3) in moving an object 3 feet from (0,0) to the point in the first quadrant along the line y = (1/2)x. The answer is 85.38 footpounds. I just need to figure out how to get the answer.
asked by Em on May 25, 2011 
Algebra
The ages of three siblings combined is 27. The oldest is twice the age of the youngest. The middle child is 3 years older than the youngest. Write and solve an equation to find the ages of each sibling.
asked by Random on October 8, 2018 
Algebra
The technology cewnter bought a fax machine for $625.00 and it depreciates at a rate of $25.00 a month. Find a function(f) that can be used to determine the value of the fax amchine (t) months after purchase. Would it be F(t)=25(t)625
asked by Anonymous on September 10, 2011 
Rate Laws
If the initial concentration of AB is 0.210 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75 s? The reaction is in the second order: rate=k[AB]^2 The rate constant is k=5.4*10^2 M*s I don't
asked by Kyle on February 20, 2010 
Algebra
The ages of three siblings combined is 27. The oldest is twice the age of the youngest. The middle child is 3 years older than the youngest. Write and solve an equation to find the ages of each sibling.
asked by Random on October 8, 2018 
Trigonometry
two pulleys of a car engine radius of 8 cm and 5 cm respectively are connected by a belt. The larger pulley rotates 80 times per minute. Find the angular velocity of each pulley in radians per minute.
asked by Miranda on November 10, 2015 
Math
The area of cross section of a pipe is 5.4 centimetres square and the water pump out of it at the rate of 27 kilometre per hour find the volume of water which flows out of the pipe in 1 minute
asked by Rayan patel on January 10, 2017 
uncertainty principle
an electron inside spherical metallic particle of volume 10^ 12 metre cube has a kinetic energy about 10 eV. use uncertainty relations to find relative uncertainty in electron velocity .
asked by ...... on September 29, 2013 
Math (College PreCal)
The exact conversion between the English measurement system and the metric system is given by the equation 1 inch= 2.54 cm. Let f(x) be the number of miles in x meters. Find a formula for f(x). Give an exact answer.
asked by anonymous on September 29, 2013 
math
For a normal distribution with mean of 80 and a standard deviation of 8, find the number of standard deviations the raw score 67 is from the mean (Give answer as a positive value rounded to nearest hundredth). (67  80) / 8 = 13/8 is this the right answer
asked by Sam on July 20, 2017 
Maths
I need some help with my maths questions please! What angle does the tangent to the curve y=x^4x^3+7x make with the positive direction of the xaxis at the point where x=2? Find any x values for which the gradient of the tangent to the curve y=x^23x1 is
asked by Dave on October 13, 2015 
math
the dimensions of Gina's dining room table are represented by (3x7) and (30x). Find the perimeter 0f the table in terms of x. I did (3x7)(x+30) 3x^2+90x+7x210 3x^2+97x210 Is this correct? Thanks for checking my work, I appreciate it
asked by B8 on November 27, 2013 
math
cory drops a bouncing ball form a height of 50 ft and it rebounds to 90% of its previous height.find the total distance the ball will have travelled when it hits the ground for the fifth time
asked by Dennis on May 12, 2010 
Physics
For the harmonic potential V(x,y) = x^2 + y^2 a)Find the total differential, dV. b) Show that dV is exact c) Given that dV = Fx.dx + Fy.dy where Fx and Fy is the force in the x and y direction, respectively, write a differential equation describing the
asked by Beth on November 14, 2008 
math
ABC is a sector of a circle with radius R and center C. The arc DE lies on a circle also centred at C. If DE divides ABC into two regions of equal area, find the length of CD in terms of R
asked by Lala on October 26, 2017 
Physics
A heating instrument has 12 resistors and they are placed vertically and have a uniform reducing Power.The powers of the first, second, third and fourth resistors are 3000,2600,2200 and 1800 respectively.Find the power of the resistor?
asked by Robotic on July 31, 2019 
physics
A proton is released at the origin in a constant electric field of 850 N/C acting in the positive xdirection. Find the change in the electric potential energy associated with the proton after it travels to x = 2.5 m.
asked by Cal on January 29, 2010
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