Sunday

December 21, 2014

December 21, 2014

Total # Posts: 142

**statistics**

suppose that the teacher of this class graded solely on a curve - 10% get A, etc. How might this effect students getting into into study groups to prepare homework or tests?
*October 11, 2014*

**geometric sequence**

what are you dividing??
*September 27, 2014*

**geometric sequence**

The sum of the 2nd and 5th terms of a geometric sequence is 3.5. The sum of the 3rd and 6th is -7. Determine the ratio r of the sequence and the first term a.
*September 27, 2014*

**chemistry**

If 70.0 mL of water is added to 30.0 mL of 0.400 M solution of NaOH, what is the new concentration of NaOH?
*September 27, 2014*

**History on Middle Ages(PLEASE HELP NOW)**

C!! just took the quiz and got all of it right!
*September 24, 2014*

**Physics**

An 80.0 kg rollerblader is at rest at the top of a 100 m hill at a 7o incline. The coefficient of friction on the hill is 0.110. What is the roller blader's kinetic energy at the bottom of the hill?
*September 22, 2014*

**maths**

Two sides
*July 30, 2014*

**chemistry**

The density of 19.0% by mass of nitric acid, HNO3 is 1.11 g cm-3. Calculate the volume (dm3) of acid needed to prepare 2.00 dm3 of 3.00 mol dm-3 HNO3 solution. (FW HNO3 = 63 g/mol)
*March 28, 2014*

**english**

What is the tone in "a thankless experience
*March 26, 2014*

**math**

dunno
*December 8, 2013*

**calculus**

A closed cardboard box is made with a square top and bottom, and a square horizontal shelf inside that divides the interior in half. A total of 12 square meters of cardboard is used to make the top, sides, bottom, and shelf of the box. What should the dimensions of the box be ...
*November 15, 2013*

**calculus**

A dog kennel with four pens is to be constructed. The pens will be surrounded by rectangular fence that costs $23 per meter. The rectangle is partioned into four pens of equal size with three partitions made of fence that costs $12 per meter. Each pen measures x meters wide by...
*November 15, 2013*

**Math**

0 is the intercept because the line passes through the axis at X=0 or y=0
*November 11, 2013*

**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
*November 11, 2013*

**Chemistry**

Electron exhibiting a particle wavelength of 7.18 x 10-9 are emitted from hydrogen atoms after interaction with high energy photons. Assuming that the electrons in the hydrogen atom were in their ground state prior to interaction, determine the wavelength of the photon which ...
*October 12, 2013*

**microeconomics**

Question 20 of 20 5.0 Points If the government attempts to control pollution with a command-and-control policy: A. the government will control the firm's entire production process. B. the government will force the firm to use particular pollution-control technologies. C. ...
*September 17, 2013*

**physics**

a large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. if the time of the collision is 1 sec then, a) which vehicle experiences smaller force of impact? b) which vehicle experiences the ...
*June 7, 2013*

**Physics**

Suppose that we repeat the experiment shown in the video, but we replace one of the cylinders with a cylinder that has twice the radius (and use larger containers of water). If the height of the original cylinder is \rm h, how deeply must we submerge the new cylinder to get ...
*April 23, 2013*

**physics**

A key falls from a bridge that is 45 m above the water. The key falls straight down and lands in a model boat traveling at a constant velocity of 3.5 m/s. Calculate the distance the boat was from the point of impact when the key was released. Answer d= 10.6 m
*November 11, 2012*

**physics**

A ball is dropped from the top of a building. The balls fall 3 times farther during its last second of freefall than it did during its third second of freefall. The ball fell 4.9 meters during its first second, how tall is the building and how much time is the ball in the air...
*November 11, 2012*

**math algebra**

.075*10000 = .08x + .06(10000-x) x = 7500 ------ .075*10000 = .08*7500 + .06(10000-7500) .075*10000 = 600 + .06(2500) .075*10000 = 600 + 150 .075*10000 = 750 750$
*November 7, 2012*

**geometry**

A swimming pool is 3 ft deep in the shallow end the bottom of the pool has a steady downward drop of 12 degrees if the pool is 50 feet long how deep is the deepest end?
*October 22, 2012*

**Calc**

thanks for the first part. i wanted something that was more step-by-step for the second one.
*October 1, 2012*

**Calc**

Evaluate the integral using any method: (Integral)sec^3x/tanx dx I started it out and got secx(1tan^2x)/tanx. I know I just have to continue simplifying and finding the integral, but I'm stuck on the next couple of steps. Also, I have another question witht he same ...
*October 1, 2012*

**Chemistry**

just get the molar mass and use multiplication by one, meaning it would be mol/1 x grams(from molar mass)/moles(1)of the compound.
*October 1, 2012*

**Chemistry **

What mass of Ca(OH) 2 is required to make 1.5 l of a 4.0% (w/v) solution of Ca(OH)2 in water?
*September 18, 2012*

**Calculus**

Find the volume of the solid generated by revolving the region bounded by the line y=5x+6 and the parabola y=x^2 about the following lines: a) the line x=6 b) the line x=-1 c)the x axis d) the line y=36 Thanks!
*September 16, 2012*

**Chemistry**

A 50.0 mL graduated cylinder has a mass of 67.6 g. When it is filled with an unknown liquid to the 38.8 mL mark, the cylinder and liquid combined have a mass of 119.4 g. Calculate the density of the liquid in g/cm3. (1 mL = 1 cm3.)
*September 12, 2012*

**Chemistry**

the steps are right but its not al its zn.
*June 3, 2012*

**calculus**

Integral from pi/6 to pi/4 of 2sin(2x)cos(2x)dx=
*March 8, 2012*

**physics**

A wire 453 m long is in a 0.2 T magnetic field. A 2.56 N force acts on the wire. What current is in the wire? Answer in units of mA
*March 4, 2012*

**algebra**

solve by using the square root method: (5y+4)^2+100=0
*March 4, 2012*

**6th grade math**

23. 5.87 25. 9.035 27. 8.669 29. .143
*January 4, 2012*

**calculus**

The value of c for which f(x) = x + c/x has a local minimum at x= 3 is (a) -9 (b) - 6 (c) -3 (d) 6 (e) 9
*December 25, 2011*

**English**

22 is B. do you know 7) I wonder if my daydream of my neighbor's house being raided has worked its way across the street. ?
*December 3, 2011*

**English**

16 is the american. do you know what 11)I didn't care much for the poems she wrote. ?
*December 3, 2011*

**6th grade math**

2:1 or 2/1
*November 29, 2011*

**Chemistry**

.092
*October 31, 2011*

**chemistry**

what is the volume in liters of 3.0 moles CH4, at 26C and 1.48atm?
*October 26, 2011*

**statistics**

test
*October 21, 2011*

**physics**

a cat walking at 0.25 m/s sees a mouse and accelerates uniformly at 0.40 m/s (squared) for 3.0 s. what is the cat's displacement during this time?
*September 25, 2011*

**English Check**

hi
*September 14, 2011*

**Physics**

A car starting from rest, accelerates at 5.0 m/s^2 fpr an unknown time interval. If the car travels 250 m in the acceleration period, what is the time interval?
*June 14, 2011*

**physics**

An object accelerates from 5.0 m/s to 100m/s. If the object traveled 250 m during this time, what was the acceleration?
*June 14, 2011*

**Science **

Equal Masses of phosphorus and chlorine react according to the follow equation. 2P+3Cl2=2PCl3 Which reagent is in excess and what percentage of it will remain at the end of the reaction
*May 9, 2011*

**principle of managemen**

jkyfgttctt
*April 23, 2011*

**physics 1**

197.568
*February 1, 2011*

**engineering **

isnt the area of a circle Pi*R^2?
*January 13, 2011*

**half life**

look at the intro to nuclear physics (2500U) tutorial notes (tut 6 i think)
*January 13, 2011*

**math**

1+4+s=
*January 12, 2011*

**math**

1+4+s=
*January 12, 2011*

**Pre -calculus**

An observer 2 km from the launching pad observes a vertically ascending missile at an angle of elevation of 21 degrees. 5 seconds later the nagle has increased to 35 degrees. What was its average speed during this interval? If it keeps going vertically at the same average ...
*December 5, 2010*

**physics**

-272.97
*November 13, 2010*

**Math 12**

trig question 2sin^2x+sinx-6=0 how to solve for x when the restriction is x is greater than or equal to zero but less than 2pi
*October 21, 2010*

**CHEMISTRY (WEBWORK)**

how about parts a and b?
*July 19, 2010*

**CHEMISTRY (WEBWORK)**

problem 7 part A: iii, iv. part b: i. didn't get problem 8 yet.
*July 19, 2010*

**CHEMISTRY (WEBWORK)**

i got it right.
*July 19, 2010*

**CHEMISTRY (WEBWORK)**

number 9 part A is : v, vi
*July 19, 2010*

**College Physics**

A 8.2 gram lead bullet that was stopped in a doorframe apparently melted completely on impact. Assuming the bullet was fired at room temp., what is the minimum muzzle velocity of the gun?
*May 6, 2010*

**Horizon**

What would the final volume of water be if 80.0 kJ were added to a 100.0 mL sample at 100.0 degrees Celsius?
*April 29, 2010*

**Accounting**

I know this is late, but its mostly to those that will get this problem at some point. You are right about the journals. To find the Rent expense, you need to add ALL payments (11,000+11,600+12,200+12,800+...+23,000) then divide by 21 (the term of the lease) To find Cash, ...
*March 8, 2010*

**math**

A rectangular field 250 m long by 110 m wide. How much shorter is it to walk diagonally across the field than around the sides?
*March 1, 2010*

**calc**

A train travels from city A to city B. The cities are 600 miles apart. The distance from city A at t hours after the train leaves A is given by d(t) = 50t + t^2. What is the average velocity of the train in miles per hour during the trip from A to B?
*February 6, 2010*

**math**

I am working on a problem where I am to graph the equation and identify the y intercept the equation is y+x=-9 On the graph, I plotted (0,-9) and (-9,0); I identified the y intercept as (0,-9) Is this correct?
*January 9, 2010*

**algebra**

My answer to the question below is >=22.5 is it correct 0.6x+4<=1.0x-5
*January 9, 2010*

**Child Psychology**

They are authoritarian answer c
*January 7, 2010*

**math**

I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years. In 1997 it was 75.2 ...
*January 7, 2010*

**Algebra**

I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years. In 1997 it was 75.2 ...
*January 6, 2010*

**Math**

I am lost, and I bet it is simple, but I have been working with many problems and I keep coming back to this and I grow increasingly confused. How do I begin to solve this problem? In 1993 the life expectancy of males in a certain country was 71.7 years. In 1997 it was 75.2 ...
*January 6, 2010*

**MATH/ALGEBRA PLEASE**

Okay, I think I have arrived at all the answer to the questions thrown my way. However, how do I explain what is happening “graphically”, where the services are charging same rate? : Your company must use a transportation service to shuttle their corporate partners ...
*December 17, 2009*

**Help;is this correct?**

Graphically, where the services are charging the same rate, the graphs will intersect. A solution of a system of equations in two variables is an ordered pair that makes both equations true.
*December 17, 2009*

**Algebra help**

Okay, I think I have arrived at all the answer to the questions thrown my way. However, how do I explain what is happening “graphically”, where the services are charging same rate? : Your company must use a transportation service to shuttle their corporate partners ...
*December 17, 2009*

**Algebra**

Okay, I think I have arrived at all the answer to the questions thrown my way. However, how do I explain what is happening “graphically”, where the services are charging same rate?
*December 17, 2009*

**Math**

Here is the question: The mortgage department of the company is selling two model homes that are located on the same block. The square footage, as well as the type of model, determines the cost of these homes. e) The second home has 1000 square feet less than twice the square ...
*December 17, 2009*

**MATH**

Thanks
*December 16, 2009*

**MATH/amendment**

I added a few more sentences, does this sound okay, or should I exclude it? The interval notion is a way to express solutions of an inequality. Points a and b are the endpoints of the interval; we can include parentheses and brackets to express the interval notation; (a,b) ...
*December 16, 2009*

**MATH**

Give a response of at least 50 words to the following: Describe the graph of the interval [-4, 3). • Explain how this differs from the graph of the interval [-4, 3]. From the question above, does the answer below sound right? The interval notion is a way to express ...
*December 16, 2009*

**algebra**

.45n
*November 26, 2009*

**algebra**

It would look like this...9(23-4y)+7y=4 Then you simplify 9*23=207 9*-4y=-36y so you now have 207-36y+4y Combine like terms -36y+4y=-32 -32y=4 Finally you divide the end reslut is y=-8
*November 26, 2009*

**physics**

If you jump from rest from a height of 2.0 m above ground, what is your speed (magnitude only), right before you hit the ground? Give your answer numerically in m/s using decimal notation (omit the units). Use the acceleration due to gravity as g=9.8 m/s2 i got my answer as 6...
*September 22, 2009*

**Math**

if amy had 800 apella and their two firends hoe much would their friend will get?
*September 13, 2009*

**english**

“We can't all be heroes, because somebody has to sit on the curb and applaud when they go by.” what does this quote mean?
*April 8, 2009*

**chemistry**

only br and h are produced, br in the anode and h in the cathode
*March 31, 2009*

**CHEM..URGENT!**

What is produced at each electrode in the electrolysis of NaBr(aq) and AgF(aq)?
*March 30, 2009*

**chemistry**

Which substances in each of the following pairs would have the greater entropy? Explain. (a) at 75°C and 1 atm: 1 mol H2O(l) or 1 mol H2O(g) (b) at 5°C and 1 atm: 50.0 g Fe(s) or 0.80 mol Fe(s) (c) 1 mol Br2(l,1 atm, 8°C) or 1 mol Br2(s, 1 atm, -8°C) (d) 0.312 ...
*March 20, 2009*

**Algebra**

Sorry i typed the question wrong. Suppose the growth of a population in millions is modeled by 3.2 * (4.72^t. What is the size of the population initially?
*February 5, 2009*

**Algebra**

Suppose the growth of a population in millions is modeled by 3.2*(4.72)^t. What is the size of the population in millions?
*February 5, 2009*

**Physics**

A free electron is captured by a proton forming a Hydrogen atom. If the electron ends up in the ground state then what is the wavelength of the photon it emits during this process?
*November 21, 2008*

**Physics**

A free electron is captured by a proton forming a Hydrogen atom. If the electron ends up in the ground state then what is the wavelength of the photon it emits during this process?
*November 21, 2008*

**science**

A free electron is captured by a proton forming a Hydrogen atom. If the electron ends up in the ground state then what is the wavelength of the photon it emits during this process?
*November 21, 2008*

**physics**

Many subatomic particles have the same charge as an electron (e) but much different masses. For instance, the muon has the same charge as an electron but its mass is roughly 207 times greater. Explain the changes you would have to make to the e/m tube and Helmholtz coils if ...
*October 30, 2008*

**physics**

A continuous stream of water is flowing out of a faucet and falling into a sink below. Explain why this stream of water is narrower at the bottom (near the sink) than at the top (near the faucet).
*October 17, 2008*

**physics**

A seashell is basically an open-closed tube rolled up. Explain why you hear a roaring sound (the sound of the sea) when you place a seashell (or any other kind of tube) up to your ear.
*September 26, 2008*

**physics**

Explain how the pitch of the roaring sound relates to the length of the tube.
*September 26, 2008*

**Chemistry**

Chromatography How can I tell which of two mobile phases is more polar? Does the fact that one solvent (e.g. isopropanol/ammonia) moves up the TLC plate slower than another solvent (e.g. hexane/ethyl acetate/ethanol)? Or should I look at how far up the dyes have moved?
*September 26, 2008*

** : Arithmetic Sequence**

13,26,39,52
*September 7, 2008*