Sunday

July 5, 2015

July 5, 2015

Total # Posts: 2,501

**psychology **

The only research method that can determine whether a cause-effect relationship exists between two factors is called a(n) __________.
*July 3, 2015*

**Physics**

Would a feather have more air resistance than a lump of lead?
*June 25, 2015*

**Physics**

For centripetal acceleration, if the radius increases, does that mean the angle is decreasing?
*June 24, 2015*

**Algebra 2**

solve using substitution method: x=-5 y=2 z=0 x+3y-z=1 -4x-2y+5z=16 7x+10y+6z=-15
*June 10, 2015*

**physics**

A crate sits on wooden horizontal surface (a wooden floor). The figure shows a top view of this looking down onto the crate (gravity would be acting into the page). Man one and man two apply forces F1 and F2, at angles of θ1 and θ2 respectively, with the goal of ...
*June 3, 2015*

**Chemistry**

When 1 mole of ethylene (C2H4) is burned at constant pressure, 1410 kJ of energy is released as heat. Calculate dH for a process in which 10.0 g of ethylene is burned at constant pressure.
*May 26, 2015*

**Chemistry**

When 1 mole of ethylene (C2H4) is burned at constant pressure, 1410 kJ of energy is released as heat. Calculate (delta) H for a process in which 10.0 of ethylene is burned at constant pressure
*May 26, 2015*

**English**

How do I use an apostrophe to write this is James book? James'?
*May 13, 2015*

**Maths - Trigonometry**

The eaves of a roof sloping at 23° overhand the walls, the edge of the roof being 75 cm from the top of the wall. The top of the wall is 5.4 meters above the ground. What is the height above the ground of the edge of the roof, to the nearest centimeter?
*May 13, 2015*

**Math**

Two ladders are the same distance from the base of a wall. The longer ladder is 15m long and makes an angle of 58 with the ground. if the shorter ladder is 12.6m long, what angle does it make with the ground?
*May 13, 2015*

**Ton**

If 2 dice are tossed 1000 times, predict the approximate number of times each sum below would occur in 1000 tosses. 2: 3 4 and so on until 12 HOW DO U DO THIS?!
*May 12, 2015*

**English**

What should be underlined or quoted in this sentence? The Dance of the Sugarplum Fairy is a melody in The Nutcracker Suite. The nutcracker suite underlined? What about famous dances?
*May 12, 2015*

**chemistry **

calculate the solubility in grams of KCL3(s) per 100 ml of water
*May 10, 2015*

**chemistry**

Higher to noise ratios can be achieved in FTIR spectra compared to spectra from dispersive IR instruments. How is such a useful feat achieved in FTIR
*May 10, 2015*

**Science**

Are these answers correct? 1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere**** Chromosphere Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar ...
*May 6, 2015*

**Chemistry**

Carbon monoxide and hydrogen react according to the equation: CO(g) + 3H2(g) CH4(g) + H2O When 1.00 mol CO and 3.00 mol H2 are placed in a 1L flask at 1200K and allowed to come to equilibrium, the reaction mixture is found to contain 0.387 mol H2O. What is the molar ...
*April 29, 2015*

**science**

thank youu
*April 29, 2015*

**science**

The aquarium was sealed and placed at a bright corner. After two weeks, both the number of water plants and water snails increased. (a) Besides their gaseous needs, state one other way in which the water snail and the water plant are interdependent.
*April 29, 2015*

**math**

11.558
*April 29, 2015*

**math**

Find the surface area of the cylinder to the nearest whole number. The figure is not drawn to scale. 13 in on top, 14 in around/
*April 29, 2015*

**chemistry**

Calculate the approximate pH of a 0.1 M solution of ethanoic acid at 298 K, given that the dissociation constant, Ka, is 1.75 x 10-5 mol/L at 298 K.Ethanoic acid dissociates in aqueous solution as follows: CH3COOH(aq) + H2O H3O+(aq) + CH3COO-(aq)
*April 28, 2015*

**math**

how do I find the max number of 1.7 inch diameter spheres that can be stored in a cylindrical tank the tank has a radius of 2 inches and height of 4 inches there are 2 inches of water in the tank
*April 26, 2015*

**physics**

Through beta decay, 55Cr (Chromium‑55 –with mass 54.94080 u) emits an electron (0.00055 u) leaving a daughter nucleus of 55Mn (manganese‑55 with mass 54.93800 u). a) How many different particles to we get out of this reaction b) How much energy in MeV is ...
*April 17, 2015*

**Statistics**

how did you do them? do you have an equation or anything?
*April 12, 2015*

**Statistics **

I'm stuck on this homework question. If someone can just help get me started with the first one I'm sure I can do the rest. I'm just not sure how to begin. Thanks! 1. A production process produces 90% non-defective parts. A sample of 10 parts from the production ...
*April 12, 2015*

**Combinations-Math**

A group of 9 workers decides to send a delegation of 3 to their supervisor to dicusss their grievences. c.) If there are 4 women and 5 men in the group, how many delegations would include at least 1 women? iS THIS CORRECT: C(4,1)xC(5,1)+C(4,3)XC(5,0)=24
*April 10, 2015*

**math**

Is it Median??
*April 9, 2015*

**Math**

Thanks!!
*April 9, 2015*

**Math**

Is it B?
*April 9, 2015*

**Math**

Im still confused because I'm getting a decimal
*April 9, 2015*

**Math**

Im confused on how you are supposed to solve it Ms. Sue.
*April 9, 2015*

**Math**

Im confused on
*April 9, 2015*

**Math**

A company predicts that this years sales will be equivalent to 144% of last years sales. Which value represents 144%? A. 14.4 B. 1 11/25 C. 1.56 D. 14 4/5
*April 9, 2015*

**Chemistry (Acid/Base)**

Consider a solution made by mixing 100 mL of 2.0 M acetic acid (Ka= 1.8e-5) with 100 mL of 0.00020 M benzoic acid (Ka= 6.4e-5). How many moles of solid NaOH must be added to the solution so that half of the benzoic acid is protonated (i.e. such that [HA] = [A-] for benzoic acid)?
*April 9, 2015*

**chemistry**

What types of intermolecular forces allow CO2 to dissolve in water? Do CO2 and H20 have a relatively strong or weak attraction?
*April 8, 2015*

**Math**

Jill said that an angle is made of any two rays. Is she correct? Explain
*April 8, 2015*

**Algebra**

Glen created a mural on a rectangular sheet of paper with a width of √18 feet and a length of √24. A. Find the exact area of the mural, in simplified form. When Glen’s mural was unveiled, the school made a smaller version of the mural to advertise the event. ...
*April 7, 2015*

**Chemistry**

If you have 225 grams of Ca3(PO4)2, and 185g H3PO4; calculate which is the limiting reagent, which the XS reagent, and how much product you will produce from the limiting reagent (in grams) Ca(PO4)2 + 4H3PO4 = 3Ca(H2PO4)2
*April 7, 2015*

**Chemistry**

If you need to produce 355 grams of oxygen gas (O2) in the electrolysis reaction of water by an electric current. If the reaction is run at 125 degrees Celsius in a reactor volume 22500ml. What is the pressure of the produced oxygen in mm Hg?
*April 7, 2015*

**Chemistry**

If you have a 1255ml of a 10.55 M solution of HCl and you need to dilute the solution to 1.555 M solution; How much solvent must you add?
*April 7, 2015*

**Chemistry**

In a 25.8 liter vessel of nitrogen gas that is heated from 10 degrees Celsius to 110 degrees Celsius to reach a final pressure of 17450 mm Hg; how many grams of N2 do you have in the vessel?
*April 7, 2015*

**Chemistry**

What are the correct and accurate products for the following ion combination reaction? Then write the ionic form of the reaction and the net ionic form of the reaction. K2CO3 + CaCl2 ->
*April 7, 2015*

**Chemistry**

What are the correct and accurate products of the following neutralization reaction. Then write the ionic form of the equation and the net ionic form. KOH + H2SO4 ->
*April 7, 2015*

**physics**

When using a double slit with light of wavelength 504 nm, it is observed that the 4-th order maximum of the interference pattern occurs at the positions of the first minimum in the diffraction pattern. If the width of the slits is 0.24 mm, what is in mm the separation of the ...
*April 6, 2015*

**Geometry**

Does anyone know the answer???
*April 3, 2015*

**Geometry**

Please help!!!
*April 3, 2015*

**Geometry**

I meant paste the arrow!!
*April 3, 2015*

**Geometry **

AB (with an arrow over AB I can't past the arrow so yeah) passes through A(-3, 0) and B(-6, 5). What is the equation of the line that passes through the origin and is parallel to AB? (with an arrow over it again) a)5x – 3y = 0 b)-x + 3y = 0 c)-5x – 3y = 0 d)3x + ...
*April 3, 2015*

**calculus**

(1 pt) When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV1.4=C where C is a constant. Suppose that at a certain instant the volume is 390 cm3, and the pressure is 75 kPa (kPa = kiloPascals) and is ...
*April 1, 2015*

**calculus**

1 pt) Coroners estimate time of death using the rule of thumb that a body cools about 2 degrees F during the first hour after death and about 1 degree F for each additional hour. Assuming an air temperature of 68 degrees F and a living body temperature of 98.6 degrees F, the ...
*April 1, 2015*

**Chemistry**

A student generated oxygen gas by decomposing hydrogen peroxide (H2O2) according to the following equation: 2H2O2(aq) -> 2H2O(l) + O2(g) If the student started with 1.75 moles of hydrogen peroxide, how many moles of oxygen gas would be produced? Show your work. ((If you can...
*April 1, 2015*

**algebra**

I have to solve this problem do not understand Chang picked 36 Apples and kept 8 of them. He split the remaining apples among his sister and brother most write an algebraic expression on how many his sister and brother got.
*March 31, 2015*

**Calculus**

A small resort is situated on an island that lies exactly 5 miles from P, the nearest point to the island along a perfectly straight shoreline. 10 miles down the shoreline from P is the closest source of fresh water. If it costs 1.5 times as much money to lay pipe in the ...
*March 30, 2015*

**calculus**

Find the point on the line 2x+4y+7=0 which is closest to the point (4,−3).
*March 30, 2015*

**calculus**

A Norman window has the shape of a semicircle atop a rectangle so that the diameter of the semicircle is equal to the width of the rectangle. What is the area of the largest possible Norman window with a perimeter of 31 feet
*March 30, 2015*

**Chemistry**

What pressure is required to reduce 34 mL of a gas at standard conditions to 16 mL at a temperature of 20◦C
*March 29, 2015*

**Calculus**

The area of a circular oil slick is increasing at a constant rate of 2 square miles per day. How fast is the radius increasing when the area is 4(pi) square miles (approximately 12.57 square miles)? So far I have that the area increases at the rate of x+(2mi^2/d) but I don'...
*March 29, 2015*

**Personal Finance**

The global economy seems to be in a debt crisis. The National Debt (what we owe) of the United States is now over $18 Trillion dollars and growing every day. Our Gross Domestic Product (our income) is around $16 Trillion. That means our debt is more than our income. Does this ...
*March 27, 2015*

**Math**

Hi! I need help with these two questions. Thanks! :) 1.) Can we multiply the Matrix A (which is 3 x 4 matrix) by the other matrix, Matrix B (which is 3 x 4 matrix)? True Or False? 2.) When we multiply the 6 x 3 matrix by the 3 x 1 matrix, the final matrix would be in what ...
*March 26, 2015*

**Physics **

The heating element in a George foreman grill is plugged into a 120-V wall socket, and 1 C of charge passes through it every 0.09 s. What is its power output, and what is the electrical energy being converted into?
*March 25, 2015*

**Physics **

The heating element in a George foreman grill is plugged into a 120-V wall socket, and 1 C of charge passes through it every 0.09 s. What is its power output, and what is the electrical energy being converted into?
*March 25, 2015*

**math - question stuck!**

Thank You So much, I appreciate the help
*March 25, 2015*

**math - question stuck!**

Q. A farmers in Alberta often deliver wheat to grain elevators using grain truck, which are a type of dump truck. A farmer make two trips to a grain elevator. The grain elevator manager measures the combined mass of the farmer's truck and wheat in tonnes (t), and then ...
*March 25, 2015*

**science**

A bird flying west at 35m/s dives south at 35m/s. Did the bird’s velocity change, if so how?
*March 24, 2015*

**MATH**

Q. A farmers in Alberta often deliver wheat to grain elevators using grain truck, which are a type of dump truck. A farmer make two trips to a grain elevator. The grain elevator manager measures the combined mass of the farmer's truck and wheat in tonnes (t), and then ...
*March 23, 2015*

**Statistics**

I have a bunch of questions to work on with this specific scenario but I was hoping someone can just help me get started on the first one because I'm having trouble getting started and I'll do the rest on my own.Thanks for any help! In a southern state, it was revealed...
*March 22, 2015*

**math _ HELP !!**

two points on the graph of a linear functions are (-3,5) and (-1,4). Determine the equation of the function in slope form ? can someone help explain in step ? Thanks
*March 21, 2015*

**Calculus**

Let f(x)=−x^4−8^x3+5^x+2. Find the open intervals on which f is concave up (down). Then determine the x-coordinates of all inflection points of f. 1. f is concave up on the intervals 2. f is concave down on the intervals 3. The inflection points occur at x =
*March 20, 2015*

**Calculus **

Find constants a and b in the function f(x)=(ax^b)ln(x) such that f(1/5)=1 and the function has a local minimum at x=1/5.
*March 20, 2015*

**Calculus **

Find constants a and b in the function f(x)=axbln(x) such that f(15)=1 and the function has a local minimum at x=15.
*March 20, 2015*

**physics**

Unpolarized light from an incandescent lamp has an intensity 112.0 Cd as measured by a light meter. a) What is in Cd the intensity reading on the meter when a single ideal polarizer is inserted between the bulb and the meter? b) What is in Cd the intensity reading on the meter...
*March 19, 2015*

**Chemistry**

A hot air balloon has a volume of 5.00x10^6 liters. Assuming a density of air of 1.293g/L at 25C and 1atm pressure, what temperature must the operator of the balloon achieve in order for the balloon to lift a 500.0kg payload? How do I set this up???????
*March 18, 2015*

**Physics (Tension and Springs)**

An archer must exert a force of 375 newtons on the bowstring so that the string makes a 35 degree angle with the vertical. a)find the tension in the bowstring b)if the applied force is replaced by a stretched spring, and the spring is stretched 30 cm from its unstretched ...
*March 16, 2015*

**Kinematic**

Use V=Vo+at to find time. Vo is the original velocity and V will be 0 because you are trying to see how far the motor cyclist has gone when he stops. Find time, then use x=Xo+Vot+(1/2)at^2 to find distance.
*March 16, 2015*

**Physics**

A beam of light makes an angle of θi = 53.0˚ with the normal of a slab of transparent material of t=3.80 mm-thickness. The index of refraction of the glass is n2 = 1.39. Angle 3 is 53.1 b) How far vertically (d) is the point at which the beam leaves the glass surface...
*March 13, 2015*

**chemistry**

Show the calculation of (1) the expected grams of urea (CH4N2O) formed in the reaction of 6.5 grams of lead cyanate (Pb(CNO)2) with excess ammonium hydroxide and then show the calculation of (2) the % yield if the actual yield of urea is 1.89 grams. Reaction is shown below: Pb...
*March 12, 2015*

**chemistry**

Sorry i scrolled down there is no reaction. i need help with these four questions
*March 12, 2015*

**chemistry**

Show the calculation of (1) the expected grams of aspirin (C9H8O4) formed in the reaction of 2.7 grams of salicylic acid (C7H6O3) with excess acetic anhydride and then show the calculation of (2) the % yield if the actual yield of aspirin is 1.44 grams. Reaction is shown below:
*March 12, 2015*

**chemistry**

Show the calculation of (1) the expected grams of aspirin (C9H8O4) formed in the reaction of 2.7 grams of salicylic acid (C7H6O3) with excess acetic anhydride and then show the calculation of (2) the % yield if the actual yield of aspirin is 1.44 grams.
*March 12, 2015*

**chem**

Show the calculation of (1) the expected grams of salicylic acid (C7H6O3) formed in the reaction of 1.75 grams of methyl salicylate (C8H8O3) with excess NaOH and then show the calculation of (2) the % yield if the actual yield of salicylic acid is 1.19 grams.
*March 12, 2015*

**Physics**

A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the force exerted by the ...
*March 12, 2015*

**Physics**

A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the force exerted by the ...
*March 11, 2015*

**Physics**

A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the force exerted by the ...
*March 11, 2015*

**Math**

3 pumps were used to empty a pond hold an unknown amount of water. If pump 1 can empty it in 4 days, pump 2 in 10 days and #3 in 5 days, how many days will it take to empty the pond if all 3 are running at the same time?
*March 8, 2015*

**Algebra**

A rectangular pool has a perimeter of 142 feet. The length is 25 feet longer than the width. Find the length and width of the pool.
*March 5, 2015*

**algebra**

A store sold 60 DVDs. Some of these were on sale and sold for $4.95 each, while the rest priced at $5.95 each. If the sales receipts for DVDs at the end of the day totaled $317.00, how many of each type were sold?
*March 1, 2015*

**physics -PLS HELP ASAP**

a bungee jumper is falling at a velocity of 2m/s [down] when the bungee cord just starts to stretch. after the cord stretches for 2.5s, the velocity is 11m [down]. assume that the acceleration is at constant. a) what is the acceleration of the jumper? b) what is the total time...
*February 22, 2015*

**Physics Urgent!!**

a bungee jumper is falling at a velocity of 2m/s [down] when the bungee cord just starts to stretch. after the cord stretches for 2.5s, the velocity is 11m [down]. assume that the acceleration is at constant. a) what is the acceleration of the jumper? b) what is the total time...
*February 22, 2015*

**Science**

What is the primary reason for the trend in atomic radius going from left to right across the periodic table? 1.All atoms in a given period of the table are the same size because the same main energy level is being filled. 2.There is no clear trend, the atoms all have ...
*February 13, 2015*

**science**

what happens when two objects of unequal masses collide?
*February 12, 2015*

**grammar**

Which is the subject of this sentence? Look in the index for a mention of this type of error. A. type B. index C. (you) D. mention
*February 11, 2015*

**Physics**

I had a problem with this too, though. For the first part I did basically g/4 ( M x g/4 = M x a) which should have been 2.45m/s^2 but apparently that's wrong, and I can't figure out why.
*February 10, 2015*

**Physics **

A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 23.7 minutes at an average speed of 6.31 m/s. During the second part, she rides for 25.0 minutes at an average speed of 4....
*February 9, 2015*

**Language Arts**

I am really confused, originally I thought the answer was A but now I see your opinions I'm confused. :)
*February 4, 2015*

**Phy **

A flat 1.0m^2 surface is vertical at x=2.0m and parallel to the yz-plane. What is the flux through the surface if it is located in a uniform electric field given by E= 26.0i + 42.0j + 62.0k N/C? Im having trouble understanding the question, I know how to do vectors but this ...
*February 3, 2015*

**physics**

A block of mass 3.17 kg is hanging from a rope. The tension in the rope is 12.9 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block?
*February 1, 2015*

**Physics**

Two point charges Q1=-6.80nC and Q2 = -5.80nC are separated by 33.0cm. What is potential energy of the pair? Answer in units of Joules.
*January 30, 2015*

**Language Arts**

Do you got Connections in 8th Grade?
*January 30, 2015*

**math**

Adam drew two same size rectangles and divided them into the same number of equal parts.He shaded one third of one rectangle and one forth of the other rectangle.What is the least number of parts into which both rectangles could be divided?
*January 29, 2015*

**Algebra**

Please solve using substitution method. 2n-11=m/4 n=m/-3
*January 29, 2015*