Questions Asked on
January 4, 2015

chemistry
•Which of the following solutions will be the best buffer at a pH of 9.26? (Ka for HC2H3O2 is 1.8 x 10–5; Kb for NH3 is 1.8 x 10–5.) a)0.20 M HC2H3O2 and 0.20 M NaC2H3O2 b)3.0 M HC2H3O2 and 3.0 M NH4Cl c)0.20 M NH3 and 0.20 M NH4Cl d)3.0 M NH3 and
asked by anita 
chemistry
So I did a titration lab at school with NaOH and HCl. i have to find:  volume used, NaOH  Moles of NaOH  Moles of HCl Volume used unknown HCl  Molarity of HCl solution My concentration of NaOH stock solution was 0.100 mol/lL Final buret reading, NaOH:
asked by julie 
Fitness and nutrition
What are the signs of heat exhaustion
asked by Anonymous 
Physics
An optical fiber is made of a clear plastic with index of refraction n=1.6, For what angles with the surface the light remain contained within the plastic guide?
asked by jo 
Langague Arts 8th Grade
3. What does Johnny’s mastery of riding Goblin show about his character? (1 point) He is rash and quicktempered. He is brave and determined. He is immature and selfish. He is arrogant and proud. 4. Which of the following statements most accurately
asked by Tina 
maths
the total revenue and the total profit functions (in Ringgit) of a product are given as follows: total revenue :R(x)= x^395800x total profit: P(x)=1/3x^3+800x120 where x is the number of units produced and sold. find the level of production in which the
asked by Andrew 
physics
The small piston of a hydraulic lift has a crosssectional area of 3.6 cm2 and the large piston has an area of 86 cm2. What force F must be applied to the small piston to maintain the load of 52 kN at a constant elevation?
asked by justin 
Chwmistry
how much in calories is required to raise the temperature of 415 grams of chloroform from 21.4 degrees c? The specific heat of chloroform is 0.23 cal/g°c. How many joules does this equal?
asked by Alvaro 
chemistry
what is the volume, in liter of 2.54 mol methane (ch4) gas? I've been stuck on this problem for hours, someone please help!
asked by jake 
physics
A bungee jumper of mass 75 kg uses a bungee cord with a relaxedlength of 50 m and jumps from a bridge that is 170 m above the ground. What elastic force constant is necessary for the bungee cord in order for him to jump safely. I have no idea what to do or
asked by Kim 
English
Hi. Can someone explaint the message the poems "The lamb" and "The tyger" By William Blake .. I need to know what was his message ? I read many websites and STILL don't understand. Thanks !
asked by Isa 
Math
Identify this polynomial as a perfect square trinomial, a difference of squares, or neither. 9a^2+9a+36 Is it difference of squares?
asked by Anonymous 
Physics
A 3kg mass is sliding across a horizontal surface at a constant speed while being pulled by rope with tension 20N held at a 53 degree angle above the horizontal. The force of friction is most nearly A. 30N B. 12N C. 16N D. 20N E. 1N
asked by Veronica 
PHYSICS
A uniform plank with mass 20kg and length 12m extends 2m over the edge of a building. A 40kg crate is slid out on the plank. how far can the crate be pushed without toppling the plank? A. 0.5m B. 1m C. 1.25m D. 1.5m E. 2m
asked by Veronica 
Physics
A 2kg mass moving at 10m/s slows to speed of 4m/s while sliding across a rough horizontal surface. The work done by friction is most nearly A. 116j B 116J C. 84j D. 84j E. 16j
asked by Demi 
physics
A 3kg mass is attached to end of a light rod and made to move clockwise in a vertical circle of radius 2m and speed of 6m/s. The tension in the rod at the lowest point is most nearly A. 54N B. 84N C. 30N D. 24N E. 39N
asked by Demi 
Physics
a 4 kg object is taken to a planet that has 3 times the mass of earth and 1/2 the radius of earth. On this planet the mass of the object will be most nearly.. A. 12kg B. 3kg C. 48kg D. 4kg E. 24 kg
asked by NATHAN 
Physics
how much work is done to drag a 25kg sled 80m?
asked by NATHAN 
physics
what is the power if it takes 11s to drag the sled 80m?
asked by karson 
physics
a toy car rolls horizontally on to ramp that has total height of 1.28m. What minimum velocity will aloow the car to reach the top of the ramp?
asked by karson 
physics
a car rolls down a ramp 4m long that has angle of incline equal to 37 degrees. If the car starts from rest, what will be its velocity at the bottom of the ramp?
asked by lucy 
physics
a pendulum 3m long is displaced at an angle of 40 degrees. What will be the maximum velocity of the pendulum when it is released to oscillate?
asked by lucy 
Math
Compare the models for 1/3 and 2/6. How does the number of parts relate to the sizes of the parts?
asked by Howard 
Chemistry
How would you determine if a given compound is acidic, basic or neutral? Also if given a compound, how would you determine if the state is aqueous (without a chart)?
asked by Liz 
math
Given that
asked by Adier 
physics
a wooden block of mass equal to 15kg is pressed against a spring. The spring has constant of 225N/m. If the spring is compressed 0.15m, how fast will the block travel when released?
asked by Jacob 
Maths
If the 6th term of an arithmetic sequence is 48, and the sum of the first 6 terms is 300, what is the first term and the constant difference?
asked by Jane 
physics
An acceptable unit for power would be A. kgm/s B. kgmm/s/s/s C. N/s D. Kgmm/s/s E. Js
asked by Jacob 
physics
a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? A. 10m/s B. 6.3m/s C. 16.3m/s D. 11.8m/s E. 139m/s
asked by Jacob 
Maths
I purchased a product that was listed at RM 2000. If a chain discount of 10%, 5% and a 2% were given and a chain discount of 5% was also given for prompt payment, what was the net price that I paid?
asked by Ann 
Maths
If the 6th term of an arithmetic sequence is 48, and the sum of the first 6 terms is 300, what is the first term and the constant different?
asked by Janic 
maths
If I borrow RM 100,000 to buy a house and I have to pay RM 3000 a month into an account that charges 5 % p.a compounded monthly, how many payments are needed to fully settle the loan?
asked by Desmond 
Derivative
if g(x)= 5x^63/x^2, find the 3rd and 5th derivative of the function. Pls help!
asked by Desmond 
maths
Find dy/dx for the following: a) y=3x^2  3x b) y=x^3(3+5x)^2 c) y=(x^2+1)^2/2x Please offer your help as I urgently need help
asked by Echak 
Derivative
Evaluate the following: a) S (4x^2+3)/x^2 dx b) S 4x(x^2+3) dx Please help and show the working so that I can understand as I hv no foundation in derivative. TQ
asked by A 
Algebra 1
Translate problem situation to a system of equations. Do not solve. The sum of two numbers is 10 the first number is 2/3 of the second number. What are the numbers? would it be 6, and 4? or 7, and 3? I know 2/3 of 10 is 6.66666667, so being after the
asked by slomo 
Maths
a 2 digit number is 9 times the sum of its digits .if it's ones and tens digits be x and y.write a linear equation in two variable
asked by Vishal 
Chemistry
Calculate the number of atoms in 2.58 mol antimony. Its an example problem, I need help!
asked by Bre 
Chemistry
Can someone please help me determine the mass of 1.45 mol FePO4?
asked by Bre 
math
a 2 digit number is 9 times the sum of its digits .if it's ones and tens digits be x and y.write a linear equation in two variable
asked by vishal 
Physics 11
A 1.00 x 10^4 W electric motor is used to lift a 955 kg object vertically 25.0 m at a constant velocity in 45.0 s. What is the efficiency of the motor? I did P=W/t (1.00x10^4 x 45 =W) And got 4.50 x 10^5 Then I did Ep' = Ek 955 x 9.81 x 25 = 234213.75 But
asked by Allie 
probability and statistics
a certain university in the region has a population of 20000 students distributed into 15 courses and four year levels.if you would like to determine the sample size, what technique can be applied
asked by fin 
Math
tom is eight years older than steve. three years ago, steve was two years more than one third as old as tom was then. how old is tom now? answer pls
asked by dexter taneo 
english
What does don't let me hit the ground means? it's part of the verse in the song i chose to present in school please just give me an idea on what those words mean
asked by Anonymous 
Math
John was visiting three cities that lie on a coordinate grid at (4, 5), (4, 5), and (3, 4). If he visited all the cities and ended up where he started, what is the distance he traveled? Round your answer to the nearest tenth. (like 3.2 or 5.7)
asked by Anonymous 
math
Mabel is installing a square pool in her backyard and wants a circular fence to enclose the pool to create 4 grassy areas around the pool as show in the figure. If the pool is located at the coordinates (1, 5), (5, 8), (4, 1), and (8, 4), what is the
asked by billy 
math
Draw a number line counting by 10s for 240
asked by Anonymous 
Analytical Geometry
A 10 foot long ladder is leaning against a vertical wall with the top of the ladder 8ft from the ground. What is the slope of the ladder? How far is the foot of the ladder from the wall? Can a 6 foot tall man walk under the ladder 1 foot from the wall?
asked by Julius 
maths lit,geography,tourism,business studies,l.o
Would like to know which courses I qualify in with the above subjects
asked by ayabonga 
math
the ninth term of an arithmetic progression is 52ind the and the sum of the first twelve terms is 414.find the first term and the common difference.
asked by jaylan talib 
maths
find the equation of the tangent to the curve y=4x^2+5 at the point (2,21).
asked by AA4 
maths
find the turning points for the curve y=2x^31/2x^2x+5. Determine the nature of the turning points. Appreciate your help
asked by andy 
maths
Given the demand function:p(x)=0.5x+500 where p is price in RM per unit and x is the quantity demanded and the marginal costfunction C'(x) = 0.5480, and the fixed cost =RM 900, find a) the level of production that will maximise profit b) the maximum
asked by Clara 
Math
Kevin had 3/4 yd of string. He used 1/3 of it on a school project. How much string did he use? A.5/12 yd B.1/3 yd C.7/12 yd D.1/4 yd (numbers are all fractions)
asked by Mo 
math
The weekly marginal cost functions C'(x) and the weekly marginal revenue function R'(x) of a company assembling personal computers are given by C'(x) =RM(3x^2118x+1315) and R'(x)=RM(10004x), where x is the number of computers assembled per week. If the
asked by Jane 
mathe
what is the velue of tan 37.5
asked by shubham 
Math
An orchestra buys music stands for $42 each with $298 in its bank account. Write a function rule that shows how the account balance depends on the number of stands bought. What are the initial value and rate of change of the function?
asked by Student 
mathalgebra HELP!!!!
1) A gym charges a onetime signup fee and then a regular monthly fee. The cost of a membership as a function of the number of months as a member is shown for 2010 and 2011 on the graph. a. What characteristics of the graph represent the signup fee and
asked by unicorns<3 
Precalc/Trig
For each parabola, tell in which direction the graph opens. x= 1/2y^2 y= 1/24x^2
asked by Anonymous 
Trig/Precalc
So I have two questions that have been puzzling me for quite some time and would really appreciate any help with either of them! (a) There are four positive intergers a, b, c, and d such that 4cos(x)cos(2x)cos(4x)=cos(ax)+cos(bx)+cos(cx)+cos(dx) for all
asked by majorbill 
physics
A car moves from rest with a constant acceleration of 4m/s squared for 5s .IT then continues with the speed attained for10s and then accelerates at 2m/s squared for 10s.A/ SKETCH A SPEED TIME GRAPH FOR THE WHOLE MOTION GIVING YOUR VALUES ON BOTH
asked by Gabriella 
Math
Find the product 14.4/5 of 30 A. 24 B. 8 C.30 4/5 D.20 15. 14 * 3/5 A.42 B. 20 C. 8 2/5 D.28 3/5 16. 3/10 * 2/10 A.3/50 B. 1/10 C.3/5 D.1/10 17. 4 1/3 * 1 3/5 A. 4 1/5 B. 4 4/15 C. 5 1/5 D. 6 14/15 18. 2 3/7 * 2/3 A. 1 17/21 B. 2 1/21 C. 1 4/7 D. 1
asked by Mo 
computer
mention 2 instructional materials that can be prepared using Microsoft word?
asked by thuu 
Algebra
Blending spice: Spice of life sells ground sumac for $1.35per ounce and ground thyme for $1.85 per ounce. Aman wants to make a 20 oz Zahtar seasoning blend using the two spices that sells for $1.65 per ounce. How much of each spice should Aman use? I know
asked by slomo 
Precalc/Trig
For each parabola, find the vertex and focus. x= (1/400)y^2 y= 1/8(x3)^21
asked by Anonymous 
Math
7 billion chocolate chip cookies are consumed annually. In order to find out how many cookies are consumed on average by every person in the United States, what other information would you need to know in order to solve the problem?
asked by Karen 
Science
Would there be as much variety to living things if meiosis did not occur?
asked by 8th grade Science 
math
If the temperature is 3°f at 10:00 p.m, and the temperature falls four degrees overnight, what is the resulting temperature
asked by Anonymous 
math
Janice needs to figure out her cell phone bill. She is charged a monthly flat fee of $45. She is also charged $0.25 per minute. How many minutes dis she use if her cellphone bill was $145. write an equation and solution
asked by martese 
Algebra 1
6x^33x^2+x40 Divided by x2
asked by John 
Algebra 1
x^49x^37x^28x+2 Divide by x^2+x+1 Thanks
asked by John 
History
1. Who controlled the most territory bordering the Louisiana Purchase? A Spain B France C Great Britain DMexico 2. Which of the founding fathers was an author, a statesman, and a scientist? A John Adams B Benjamin Franklin C Thomas Jefferson
asked by Elizabeth Meyer 
Precalc/trig
5=log3(x^2+18)
asked by Anonymous 
English/grammar
All of your hard work and dedication has molded you into an amazing young lady. or All of your hard work and dedication have molded you into an amazing young lady.
asked by Suzanne 
physics
explain why carrots look orange
asked by sana 
Math
Could someone please help me. Solve the linear equation by substitution. Y=102.2x 5x+y=70 For the first equation I am getting x=21.4 and for the second equation I am getting y=37. The answers are 21 3/7 and 37 1/7. Could you show me how you do this so I
asked by Cherie 
PreCalc
A ferris wheel is 63 feet tall when it reaches its highest point at 8 seconds. At the bottom of the ride, you are 3 feet off the ground. So how high off the ground will you be 5 seconds after the ride starts? Write a function f so that f(t) will equal how
asked by John 
math
un scramble math word roetopodsaoenrfir
asked by zachay 
physics
explain why carrots look orange
asked by sana 
computer science check
Which of the following examples correctly describes the order in which these parts of a program should be written? (Select the best answer.) A The import command, then function definitions, then function calls B Function definitions, then the import
asked by Skye 
math
roetopodsaoenrfir need to unscramble for a math paper
asked by jen 
History
1. How is the Seven Years War related to the French and indian war? A The French and Indian War directly caused the Seven Year's War B; The French and Indian War was part of the Seven Year's War C The Seven Years' War was more of a land war than the
asked by Elizabeth Meyer 
physics
explain why carrots look orange?
asked by sana 
Algebra I
your class sells 64 tickets to a play. A student ticket cost $1. An adult ticket $2.50 If you collect $109 in total ticket sales, how many adult tickets do you sell? please show how to solve
asked by Jarrett 
Calculus
a balloon rises straight up to 5 ft/sec. and a crying child who lost the balloon is standing 40 ft away. how fast does the balloon move away from the child when it is 30 ft above the ground?
asked by Anon 
physics
Now how far the will the ball in the problem below will hit the ground? a. 10m b. 6.4m c. 9.6m d. 20m e. 140m a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? V^2 = Vo^2 + 2g*h V^2=0^2+2*9.8*2
asked by Jacob 
Mathematics
A cylindrical tube, open at both ends, is made of metal. The internal diameter of the tube is 10.4cm and its height is 25 cm. If thickness of the metal is 8mm everywhere, calculatd the volume of metal in the cylinder
asked by Rahul