# Nat

Most popular questions and responses by Nat-
## Chemistry Suspension Examples...

I need 10 examples of household suspensions for science class tomorrow. I got 10 solutions, 10 colloids, and 10 solvents...but can't figure out 10 suspensions! Help! http://www.elmhurst.edu/~chm/vchembook/106Amixture.html Suspensions have much larger

*asked on June 15, 2005* -
## physics

a 330 kg piano slides 3.6 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. the effective coefficient of kinetic froction is 0.4. calculate a) the force exerted by the man, b)the work done

*asked on April 27, 2009* -
## chemistry

the concentration of urea (MW=60.0g/mol) in a soltuion prepared by dissolving 16g of urea in 39g of H2O is ____ molal

*asked on February 21, 2013* -
## Chemistry

The formation constant of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.31 M NaCN solution. What is the concentration of M2 ions at equilibrium?

*asked on May 6, 2014* -
## math

Peta attempted to solve the following equation. Explain Peta's error. x (x - 5) = 20 x = 20 and x - 5 = 20 x = 20 and x = 25

*asked on February 13, 2015* -
## Chemistry

Calculate the mass (in mg) of KCN needed to make 500. mL of aqueous KCN solution with a pH of 10.00. The Ka of HCN = 5.0 x 10-10. I got the answer 7.8 mg but it's wrong. Can someone please explain how to do it?

*asked on July 9, 2013* -
## Chemistry

What would be the pH of a 0.1 M aqueous solution of the phenolate ion, C6H5O–? (Ka for phenol, C6H5OH, is 1.3 x 10–10) I got the answer 5.44 but I think it's wrong. Do I have to subtract it from 14?

*asked on July 6, 2013* -
## Chemistry

A container is filled with CO2(g) and heated to 1000K. The gas pressure at this temperature is 0.50 atm. Graphite (C) is then added to the container and some of the CO2 is converted to CO according to the reaction below. The final equilibrium total gas

*asked on July 24, 2013* -
## pre calc

Katie is watching a helicopter flying at an altitude of 5 miles. If the angle of elevation is pi/3 , the distance between Katie and the helicopter is approximately miles. NextReset

*asked on July 19, 2017* -
## physics

1.0kg bomb explodes into three pieces, A, B, and C A ( 0.3kg) travel along the positive x-axis by 0.3km/s B (0.5kg) travel along the negative y-axis by 04km/s What is the velocity of C?

*asked on November 18, 2018* -
## Chemistry

A 10.0 mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the addition of 20.0 mL of the HCl solution. (potentially useful info: Ka of NH4+ = 5.6 x 10−10)

*asked on July 17, 2013* -
## Chemistry

Select the true statement below. A. a spontaneous redox reaction equation will have the stronger oxidizer and stronger reducer as products B. a salt bridge should contain ions that will participate in the redox reaction C. in a voltaic cell, the difference

*asked on August 5, 2013* -
## Physics

You are given two unknown point charges, Q1 and Q2. At a point on the line joining them, one-third of the way from Q 1 to Q2, the electric field is zero. Are Q1 and Q2 like or unlike charges? How many times greater is Q2 than on Q1? I am really confused on

*asked on February 22, 2007* -
## physics

two bumper cars in an amusement park ride collide elastically as one approaches the other directly from the rear. car A has a mass of 500kg and carB 600kg, owing to fidderences in passenger mass. if car A approaches at 4m/s and car B is moving at 3.2 m/s,

*asked on April 25, 2009* -
## Physics

A force of 8.4 N is exerted on a -8.8µC charge in a downward direction. What is the magnitude and direction of the field? How would I set up this problem? Force= Eq solve for E.

*asked on February 22, 2007* -
## PHYSICS

An underwater scuba diver sees the sun at an apparent angle of 45 degrees from the vertical. What is the actual angle of the sun? i don't know how to get the answer but the book says its 19.5 degrees can anyone help me?

*asked on March 26, 2008* -
## PLZ Check My Math?

Sorry! Another rates/proportions question! "Myles mows lawns during the summer to earn money. Since he is trying to save money for a car, he tries not to spend very much of it. In fact, his goal is to save $5 for every $7 he makes. If Myles made $128 this

*asked on December 17, 2015* -
## Chemistry

Hello, What is the hybridization of an H atom on a methane? As far as I understand, the hydrogen has 1 s orbital which bonds only to carbon, so does not have any hybridization. Is this correct? Thank you

*asked on July 15, 2010* -
## Chemistry

Consider the following reaction and select the false statement below. NaI + 3HOCl → NaIO3 + 3HCl A. HOCl is the oxidizing agent B. Cl is reduced C. NaI is the reducing agent D. If ΔG° for the reaction is < 0, then NaI is a stronger reducing agent than

*asked on July 30, 2013* -
## english

I am trying to find out how many copies of the novel "Brave New World" by Aldous Huxley have been sold worldwide or even in Australia. I can't find the statistics anywhere. Can someone please help??

*asked on March 4, 2010* -
## MATH HOMEWORK

Find the circle circumference and circle area with a circles radius 10 inches I think the circles are is 314 but don't know the circumference.

*asked on December 1, 2010* -
## Physics

a 330 kg piano slides 3.6 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. the effective coefficient of kinetic froction is 0.4. calculate a) the force exerted by the man, b)the work done

*asked on April 25, 2009* -
## physics

A boy uses a slingshot to launch a pebble straight up into the air. The pebble reaches a height of 29.0 m above the launch point 3.3 seconds later. Assume air resistance is negligible.

*asked on September 22, 2014* -
## science

scientific notation of 83.1

*asked on February 6, 2011* -
## Math

My Question is : A plane with an air pf 192 miles per hour is headed on a bearing of 121 degrees. A north wind is blowing ( from north to south ) at 15.9 miles per hour. Find the ground speed and the actual bearing of the plane.

*asked on May 18, 2008* -
## Physics

1)Three positive particles of charges 9µC are located at the corners of an equilateral triangle of side 15cm. Calculate the magnitude and direction of the force on each charge. 2)What is the electric field strength at a point in space where a proton (m =

*asked on February 22, 2007* -
## Physics

In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed

*asked on March 8, 2007* -
## science

Oxygen gas may be prepared by decomposing hydrogen peroxide, h2o2, using manganese (IV) oxide catalyst: 2H2O2(liquid) ----> 2H2O(liquid) + O2(gas) Calculate the amount of oxygen that will be produced from 1.35 moles of H2O2 Determine the mass of oxygen gas

*asked on December 8, 2014* -
## Physics

The electric field midway between two equal but opposite point charges is 1000 N/C, and the distance between the charges is 16.0 cm. What is the magnitude of the charge on each?

*asked on February 22, 2007* -
## Math

Half of a pizza was broccoli and half was mushroom. George ate 2/3 of the broccoli and 1/4 of thee mushroom part. How much of the pizza did he eat? I did this problem but I wasn't sure of my answer so I needed someone to see if I am right or not. My answer

*asked on March 27, 2017* -
## math

A brick making company manufactures bricks with the same height and width. the volume of each brick is 108 cubic inches and the base area of each brick is 36 square inches. If the length of a brick is denoted as x and the height and width of the brick is

*asked on March 26, 2015* -
## Math

Using the ordinary alphabet and allowing repeated letters, find the number of words of length 8 that begin and end with T.

*asked on October 30, 2011* -
## Science

Name 3 examples of how an abiotic factor could negatively impact an ecosystem:

*asked on June 1, 2014* -
## math

24 increased by twice a number z

*asked on September 1, 2015* -
## PHYSICS

Two capacitors, C1=25.0x10^-6 and C2=5.0x10^-6 are connected in parallel and charged with a 100-V power supply. a)calculate the total energy stored in the 2 capacitors b) what potential difference would be required across the same 2 capacitors connected in

*asked on February 4, 2008* -
## Physics

In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed

*asked on March 6, 2007* -
## Math

Match the expressions with thier equivalent equations in the columns. List A: List B: 6x+12 6(1+x) 6+6x 6x-6 6(x-1) 6(x+2) Fill in the blank: The expression 6x+12 is equivalent to the expression __________ The expression 6+6x is equivalent to the

*asked on March 29, 2017* -
## Physics

A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction è of the resultant

*asked on September 7, 2016* -
## science

10 students whose combined mass is 700 kg ride down 30 m in a elevator. How much thermal energy is produced in the elevator system by the loss in gravitational potential energy of the students

*asked on April 13, 2016* -
## Chemistry

You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the water solution after three

*asked on November 22, 2010* -
## PHYSICS

A wire of initial length Lo and radius rO has a measured resistance of 1.0 ohm. the wire is drawn under tensil stress and to a new uniform radius of 0.25rO. what is the new resistance of the wire? i know the answer is 256 ohm but i have no clue how to get

*asked on February 4, 2008* -
## Calculus

Find all points of intersection (r,theta) of the curves r=4cos(theta), r=1sin(theta). Next find the area inclosed in the intersection of the two graphs.

*asked on February 11, 2018* -
## English

I am trying to find an analysis of Oodgeroo Noonuccal's (formerly Kath Walker) poem "No More Boomerang." All i desperately need is the year it was written if you can't find a full analysis. I have looked everywhere. Please help.

*asked on August 22, 2009* -
## math

Steve is participating in a cross county bike race. Every 2 hours he travels between 42 and 54 miles. Four hours ago, Steve had traveled 56 miles from the start of the race. Which is a reasonable measure of Steve's distance from the start of the race now?

*asked on February 26, 2018* -
## cpcc

Two people are pulling a boat through the water as in Figure P4.20. Each exerts a force of 600 N directed at a θ = 45.0° angle relative to the forward motion of the boat. If the boat moves with constant velocity, find the resistive force vector F exerted

*asked on February 20, 2010* -
## math

I need to insert grouping symbols in the expression so that the value of the expression is 14 2x2+3(to the 2nd power)-4+3x5 I have done it in every way and can't get 14

*asked on August 21, 2008* -
## Physics

I am trying to calculate the distance and speed a van was travelling behind a car when an accident occured in which the van hits the car. I know that the car brakes and skids 24metres, the van behind brakes and skids 6metres. The car was stopped prior to

*asked on May 15, 2008* -
## Physics 1

A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2π rad/s. After the disk rotates through 17π radians, the angular speed is 18π rad/s. (a) What is the magnitude of the angular acceleration? answer in rad/s2 (b)

*asked on October 2, 2014* -
## chemistry

phenol is insoluble in NNAHCO3 solution while acetic acid is soluble.give reason.

*asked on July 14, 2011* -
## math 12

log6=x and log8=y, determine an expression for log3 in terms of x an y.

*asked on October 3, 2010* -
## life science

in what parts of the plant body would you expect cell division to occur? --i've looked everywhere and couldn't find anything close to an answer!

*asked on October 24, 2008* -
## PHYSICS

A certain kind of glass with index of refraction of 1.65 for blue light of wavelength 430nm and index of refraction 1.615 for red light with wavelength 680nm. If a beam of light containing these two colors has incident angle of 30 degrees what is the angle

*asked on March 27, 2008* -
## Math

Find the intersection of the following planes: 2x+y+6z=7 3x+4y+3z=-8 x-2y-4z=9

*asked on June 19, 2018* -
## science

why don't hydrocarbons have hydrogen bonding?

*asked on February 26, 2012* -
## Chemistry

You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the water solution after three

*asked on November 22, 2010* -
## physics--

a bell is hanging by a string from your review mirror in the car.while you are accelerating from a stoplight to 28m/s in 6s, what angle does the string make with the vertical? (the bell only feel the car's acceleration through the tension in the string.)

*asked on April 5, 2009* -
## math

Traffic signs are regulated by the Manual on Uniform Traffic Control Devices (MUTCD). The perimeter of a rectangular traffic sign is 106 inches. Also, its length is 11 inches longer than its width. Find the dimensions of this sign.

*asked on October 30, 2016* -
## Maths

factorise 5x^2+8x-6 please help... will be much appriciated.

*asked on February 22, 2014* -
## Chemistry

The pH of a 0.10 M solution of a certain acid is 3.25 at 25°C. What is the pH of a 0.010 M solution of the same acid at the same temperature?

*asked on July 5, 2013* -
## math

mystery numbers A = B + 5 B = C + 7 C = THE DIFFERENCE BETWEEN 13 AND 9 D = A - B

*asked on January 19, 2011* -
## Physics

In stars, nucleons (protons and neutrons) form nuclei of atoms via a series of fusion reactions. If for a particular fusion reaction more energy is given off than is required to make it proceed, does the final nucleus have a higher or lower rest mass than

*asked on May 9, 2009* -
## physics

What is the momentum of a proton travelling at v = 0.95c in the x-direction in the reference frame?

*asked on May 9, 2009* -
## physics--vectors

the components of a vector V can be written (Vx,Vy,Vz). what are the components and length of a vector which is te sum of the 2 vectors, V1 and V2, whose components are (8,-3.7,0) and (3.9,-8.1,-4.4)?

*asked on April 5, 2009* -
## Maths

I have a maths exam tomorrow and am studying with a friend. We are working on a question and are getting two different answers. Could you please show us the right way to do it? 2(4x + 3)(4x - 3) - (4x + 3)squared p.s i couldn't find a squared symbol so

*asked on March 15, 2008* -
## writing

i need help finding a title for my paper. im writing it about my relationship to a place and i wrote it about my relationship to this small town in new york. i talked about a creek and horse races and how its my second home, but i cant think of a creative

*asked on April 15, 2010* -
## physics

In Figure P4.30, m1 = 10.5 kg and m2 = 4.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.60 while the coefficient of kinetic friction is 0.30. Figure P4.30

*asked on February 21, 2010* -
## Math

A trough has width w=4ft, length L=19ft, and height h=7ft. Find the work to pump all of the water over the top of the trough with units.

*asked on February 14, 2018* -
## Sociology

What can be the relationship between Social Darwinism and Poverty?

*asked on October 5, 2017* -
## physics

How long would a car take to go from 39.3 m/s to 12.4 m/s with an acceleration of 2.8 m/s2?

*asked on October 6, 2016* -
## Physics

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it

*asked on October 9, 2013* -
## Calculus

Find the Taylor Polynomial of order 1 for the function f(x)=arctan(x/5) in powers of (x-5). Also find the remainder R1(x) as a function of x and c.

*asked on June 19, 2013* -
## math

what is value of 7 in each number 127 473

*asked on September 27, 2010* -
## Chem

Hello, In the addition of water to an alkene (e.g. ethylene) what is the electrophile? Well I thought its the hydrogen cation from the water. Since electrophiles are electron poor molecules, having a tendency for more electrons. But then it asks what

*asked on July 22, 2010* -
## Math 9th grade

x^2 + 5x +6/ x^2 - 3x -10 How do I do this? Is it asking me to divide? The answer choices are as following: A)x + 3/ x - 5 , x ≠ 5 B)x + 3/ x - 5 , x ≠ -2, 5 C)x2 + 5x + 6/ x - 5 , x ≠ 5 D)x2 + 5x + 6/ x - 5 , x ≠ -2, 5

*asked on May 4, 2010* -
## physics

consider 2 inertial reference frames, A and B, where B (a train) is moving with constant velocity, 10kn/h, in the positive x direction with respect to A.(a person standing on the station platform). if another person is throwing a ball on the train (ie in

*asked on April 5, 2009* -
## data management (gr.12)

how many different sums of money can you make with a penny, a dime, a one-dollar coin, and a two-dollar coin?

*asked on February 23, 2009* -
## English

I am trying to find out who (or which companies) own Australian channels 7,9 and 10 and also SBS. I have looked on various websites all with different anwsers. Can someone please help me find the correct answer. Thanks.

*asked on January 30, 2009* -
## Maths

Just need a bit of help understanding what exactly i have to do here to work this out. Rearrage the following equation and hence state the gradient and the y-intercept. 2y = 8x + 10 Do i just go: y = mx + c 2y = 8x + 10 y = (8x + 10) /2 y = 4x + 5 or do i

*asked on January 27, 2009* -
## Geography

I am doing an assignment on fire ants for Geography. I need a map showing the current location of the ants in Australia and a map of where they were first discovered. I have tried a million websites with every combination of words possible. Can someone

*asked on April 1, 2008* -
## Economics

Can someone please explain what factors affect a country GDP? Also, if Thailand has a GDP of 4.5% and Australia has a GDP of 2.8%, please explain which country has a better economy. Thanks for your help

*asked on September 8, 2007* -
## Geography

I have an assignment to do comparing Thailand and Australia economically. I don't understand how the GDP, inflation, unemployment and currency rate are linked. For example if inflation is high, what is the expected GDP (low or high). Can someone please

*asked on August 23, 2007* -
## Physics

In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed

*asked on March 6, 2007* -
## MAth

A punch recipe says to mix 4 cups of pineapple juice, 8 cups of orange juice, and 12 cups seltzer to make 18 servings. how many cups do you need of each to make 108 servings

*asked on October 15, 2018* -
## Math

What is 1 7/12 - 3/20 equal to? I tried to do this question but I couldn't quite get the answer. For the directions of the work, its says use the least common multiple as the denominator and when I came across this one, I couldn't quite get the answer. If

*asked on March 27, 2017* -
## Physics

A 6.2 kg model rocket is traveling horizontally and due south with a speed of 20.3 m/s when it explodes into two pieces. The velocity of one piece, with a mass of 1.6 kg, is v1 = (-12 m/s)i + (30 m/s)j + (15 m/s)k, with i pointing due east, j pointing due

*asked on February 24, 2014* -
## Microeconomics

Producing paper creates pollution. The efficient quantity of paper is when the A. marginal social benefit of paper is equal to zero. B. marginal social cost of the pollution from making paper is equal to zero. C. marginal social of paper is equal to the

*asked on August 5, 2013* -
## business law

1. Meyer, after seeing a sign on Chosnyka's land reading "FOR SALE 95 ACRES" and running a title search, sent Chosnyka an offer to buy the land as described by its legal description. The offer required acceptance by returning a singed copy within 10 days.

*asked on March 18, 2012* -
## marketing

a 1,400- to 1,750-word paper in which you describe the elements of the marketing mix (product, place, price, and promotion). Use at least 3 academic sources (non-academic sources or text materials will not be counted) to support your work. In addition,

*asked on March 5, 2012* -
## math

a+3a=36

*asked on October 5, 2011* -
## math

write the question for the answer below. about 320

*asked on January 25, 2011* -
## math

y=(x+3)(x-1)

*asked on November 7, 2009* -
## Math

For y = a sin x 'a' is called the amplitude. What effect does 'a' have on a graph ??? Please help if you can .

*asked on October 9, 2009* -
## math

write a word problem for 1/2 - 2/3 = and write a word problem for 5/12 - 1/3 =

*asked on August 28, 2009* -
## Math

without finding the exact answer select which of the following numbers is the best estimate of each sum or difference and justify your choices: - 2/3, 0, 2/3 1/9 + 2/5 - 1/3 - 3/4

*asked on August 28, 2009* -
## english

I need to find a strong verb for these weak verbs: slowly sat down laughed hard

*asked on February 4, 2009* -
## Geography

I need a map for a report showing where the fire ant was first introduced into Australia and where it has spread since. I have looked on a million websites and can't find a single thing. Can you help please?

*asked on March 27, 2008* -
## Physics

What is the repulsive electrical force between two protons in a nucleus that are 5 x 10^ -15 m apart from each other? Could you help me with this problem? I can't figure out how to do this. Use Coulomb's equation F= kQQ/r^2

*asked on February 22, 2007* -
## Min Pin Refuses to Heel

Saw some1 else had posted a dog training qu. & visited both websites (nothing unfortunately). Does any1 know how i can get my Miniature Pinscher mix to heel on his walks? I've looked at every website i could think of and came up with nothing. Thnx 4 ur

*asked on January 2, 2016* -
## chemistry

How much 35.6 M H2SO4 is needed to make a 1 L solution that is .007 ppm? Not sure how to convert from M to ppm-is there a formula?

*asked on June 10, 2015* -
## Calculus Help

Based on the following table of values for the function w(t), answer the questions below. t= 100 110 120 130 140 150 w(t)= 2.6 7.3 12.7 19 26.1 34.1 a) Which of the following best describes the derivative of w(t)? A. changes sign B. always positive C.

*asked on July 3, 2014*

## Pages

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