Monday

April 21, 2014

April 21, 2014

Total # Posts: 363

**math**

d/dx x(1+y)^(1/2) + y(1+x)^(1/2)=0. Can some1 show me the calculation because i didnt get like the answer. [ans=-1/(1+x)^2 but my calculation=-(sqrt(y+1) (2 sqrt(x+1) sqrt(y+1)+y)/(sqrt(x+1) (2 sqrt(x+1) sqrt(y+1)+x)]

**chemistry**

Starting with a 2.0 M NaOH solution, determine how you would prepare 1 L of a 0.1 M NaOH solution.

**physics (special relativity)**

A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e). (a) show that the folowing process is dynamically impossible. (b) Explain in detail how this process can be made possible (c) for part b what would be the minimum photon en...

**Physics**

A uniform disk of mass 2kg and radius 10.0cm is spinning on a fixed frictionless bearing at 3 revolutions/second. A think cylindrical shell of mass 2kg and radius 10cm is carefully dropped onto the spinning disk so that they end up spinning together, with their edges coincidin...

**Math 120**

A recent study of 750 Internet userd in Europe found that 35% of Internet users were women. What is the 95% confidence interval of the true proportion of women in Europe who use the Internet? A)0.321<p<0.379 B)0.316<p<0.384 C)0.309<p<0.391 D)0.305<p<0.395

**Math 120**

D The value of a correlation coefficient can only be in the range of -1<x<1

**Math 120**

Which of the followinf could not be the value of a correlation coefficient? A) -0.683 B) 0.197 C) 1.000 D) -1.369

**Chemistry**

Consider this equilibrium: N2O4(g) + heat NO2(g). Initially, a 1.0 L container is filled with 2.0 mol of NO2. As the system approaches equilibrium, what happens to the rate of reaction of NO2 breaking down?

**Chemistry**

Consider this equilibrium: N2O4(g) + heat NO2(g). Initially, a 1.0 L container is filled with 2.0 mol of NO2. As the system approaches equilibrium, what happens to the rate of reaction of NO2 breaking down?

**Chemistry**

Should it be 4 then?

**Chemistry**

Functional groups 1. are the repeating unit of polymers. 2. are groups of atoms whose chemical prop- erties are pretty much independent of their chemical environment. 3. perform specific biological functions using molecular recognition. 4. are a fictitious concept like oxidati...

**Algebra**

Use Gauss-Jordan to solve 3x + 2y = -4 4x – 2y = -10

**Chemistry**

How do you figure out hydrate formulas?

**physics**

AC power in the United States has 60 cycles per second. What is the period (in seconds) for this current? Round your answer to 3 decimal places.

**Phyiscs - Electro static**

Particles 1 and 2 of charge q1 = q2 = +3.20 x 10-19 C are on a y axis at distance d = 22.0 cm from the origin. Particle 3 of charge q3 = +9.60 x 10-19 C is moved gradually along the x axis from x = 0 to x = +5.0 m. At what value of x will the magnitude of the electrostatic for...

**earth science**

what is the tectonic setting of seattle washington?

**chemistry**

A certain voltaic cell has a standard cell voltage of 1.22 V, and 3 electrons are transferred in the overall cell reaction. What is the value of the thermodynamic equilibrium constant for this cell reaction at 298K?

**computer science**

Write a complete C# program that displays a menu comprising of the followings: Main Menu 1) Calculate Fuel Consumption 2) Calculate Weekly Wages 3) About This Program 4) Exit Program Enter your Choice: Calculating Fuel Consumption When the user chooses this option, the program...

**computer Science (need answer ASAP)**

Write a complete C# program that displays a menu comprising of the followings: Main Menu 1) Calculate Fuel Consumption 2) Calculate Weekly Wages 3) About This Program 4) Exit Program Enter your Choice: Calculating Fuel Consumption When the user chooses this option, the program...

**Finance**

yes

**Chemistry**

Aluminum metal is used in many products. It quickly reacts with oxygen in the reaction 4Al (s) + 3O2 (g)--> 2Al2O3 (s). Which component is different on each side of the equation arrow? a. mass b. atoms c. moles d. all are the same.

**Math**

Acceleration due to gravity

**6th grade math**

107.25/ 0.03

**science**

In the system shown in the figure , block A has mass m_A = 2.08 kg, block B has mass m_B = 0.370 kg, and the rope connecting them has a nonzero mass 0.203 kg. The rope has a total length 1.03 m and the pulley has a very small radius. Let d be the length of rope that hangs vert...

**Math**

What is the circumference of a circle with a diameter of 10 m.

**Math**

What is the sum of the measures of the exterior angles of an 11-side polygon, one at each vertex?

**m**

What is the sum of the measures of the exterior angles of an 11-side polygon, one at each vertex?

**Math**

I am confused, do I separate the two first?

**geometry**

Triangle ABC, AB=8, BC=10, and AC=12, M is the midpoint of AB, and N is the midpoint of BC. What is the length of MN?

**science**

What is a way to put alloy and concentration into a sentence that helps to explain solutions?

**science**

What is a way to put alloy and concentration into a sentence that helps to explain solutions?

**Calculus**

The machine earns the company revenue at a continuous rate of 62000 t + 38000 dollars per year during the first six months of operation, and at the continuous rate of $69000 per year after the first six months. The cost of the machine is $170000. The interest rate is 5% per ye...

**Physics**

When the three blocks in the figure below are released from rest, they accelerate with a magnitude of 0.370 m/s2. Block 1 has mass M, block 2 has 5M, and block 3 has 5M. What is the coefficient of kinetic friction between block 2 and the table? block 1 is haging off the table ...

**physics**

The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.570·mg is then applied at upward angle è = 22°. (a) What is the magnitude of the acceleration of the block across the floor if (a) ìs = 0.600 and &igr...

**Physics**

i still couldnt get the answer either

**Physics**

is Ma the mass of block a?

**Physics**

the knot is inbetween block b and the wall. block a hangs from the knot. the knot is connected to the wall by a rope attached to the wall at 30 degrees from the horizontal

**Physics**

Block B in the figure below weighs 713 N. The coefficient of static friction between block and table is 0.20. Assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary.

**college**

the length of the top of a table is 3 m greater than the width. the area is 88m^2. find the dimensions of the table

**math**

(y plus 5)y^2 - 5y plus 25)

**math**

(y plus 5)y^2 - 5y plus 25)

**chemistry**

why is it important to record detailed observations, not just conclusions?

**physics**

Andy (mass 80 kg) uses a 3.0 m long rope to pull Bob (mass 60kg) across the floor (uk= .2) at a constant speed of 1.0 m/s. Bob signals to Andy to stop by plucking the rope, sending a wave pulse forward along the rope. The pulse reashes andy 150 ms later. What is the mass of th...

**7th grade math**

How do we set up these numbers using order of operations to get a given number???? 12,18,3,11,12 = 8

**7th grade math**

order of operations 11, 10, 15, 20, 3 = 6

**chemistry**

When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 24.0 of carbon were burned in the presence of 76.8 of oxygen, 12.8 of oxygen remained unreacted. What mass of carbon dioxide was produced?

**chemistry**

sodium reacts completely with 0.142kg of chlorine, forming 234g of sodium chloride. What mass of sodium reacted? I know that for chemical changes the amounts should end up being equal, but I don't know how to set up the problem.

**Math**

What is the pattern for 3, 19, 99, 499, 2499

**chemistry**

So do I set this up as: 8.86*10^11m (1Gm/10^9m)=8.86*10^11/10^9 since my meters cancel? Which then gives me 8.86^20

**chemistry**

I am still lost on setting up the last 2.

**chemistry**

The other two questions that I can not set up for conversions is 8.86*10^11m converted to gigameters 1.57*10^-10m converted to picometers

**chemistry**

I am having a hard time with this one not sure how to set up the problem. A gas can holds 1.7gal of gasoline. What is this quantity in cubic centimeters? I know that 1gal=3.785L I know that 1L=1000cm^3 I have tried 1.7gal*3.785L/1gal=6.4345cm^3. I just can not figure out what ...

**science**

THANK YOU MS.SUE

**science**

What word means having no form?

**math 7th**

divide 6 into 48.. you get 8

**math**

How do I calcualte these conversions? 8.4cm = m 1333.8g=kg 119cm=mm 2391mL=L 3.22Mm=km 4.68fs=ps 8.86*10^11=Gm 1.57*10^-10m=picometers 381cm=in 94mm=in 5.0L=q 132kg=lbs

**trig**

How do I find 2 tan squared time x = sec times x -1

**English**

Can you tell me what words are the infintive phrase and is it a noun, adj or adv? Is it To learn and it's a noun? To learn to count in three languages is my summer goal.

**math**

Aki’s Bicycle Designs has determined that when x hundred bicycles are built, the average cost per bicycle is given by , where is in hundreds of dollars. How many bicycles should the shop build in order to minimize the average cost per bicycle?

**chemistry**

determine the end value of n in a hydrogen atom transition if teh electron starts in n=2 and the atom absorbs a photon of light with a frequency of 4.57 times 10^14 Hz

**CHEMISTRY**

EXPLAIN THE CHEMICAL COMPOSITION OF BOTH SIDE OF THE EQUATION BELOW NUMERICALLY WITH INTEGERS 3CaSO4+2ALCL3= 3CaCL2+AL2(SO4)3

**CHEMISTRY**

EXPLAIN THE CHEMICAL COMPOSITION OF BOTH SIDE OF THE EQUATION BELOW NUMERICALLY WITH INTERGERS 3CaSO4+2ALCL3= 3CaCL2+AL2(SO4)3

**CHEMISTRY**

EXPLAIN THE CHEMICAL COMPOSITION OF BOTH SIDE OF THE EQUATION BELOW 3CaSO4+2ALCL3= 3CaCL2+AL2(SO4)3

**8th grade**

how to make a double line graph to show air/water temperatures.mon.air-92 water-68tues.air-94 water-69 wed.air-88 water=70,thurs. air=85 water=72 and friday air=96,water=72

**biology**

Hydrogen Peroxide = Oxygen + Water

**physics**

When a 0.045 kg golf ball takes off after being hit, its speed is 35 m/s. A)How much work is done on the ball by the club? B)Assume that the force of the golf club acts parallel to the motion of the ball and that the club is in contact with the ball for a distance of 0.007 m. ...

**college**

756

**chemistry**

Hi, The question is, using Henry's law constant calculate the amount of Hydrogen Sulphide gas which could dissolve in 500ml of pure water (H20) placed near an active volcano assuming equilibrium conditions and ignoring any reactions with water. The atmosphere surrounding t...

**math**

What are the next four numbers in this sequence? 2,5,11,18,28

**Chemistry**

You blow me????

**math**

a motorboat traveling with the curent went 68 miles in 3hrs and 24mins. against the current, it took 4hrs and 15 mins to travel the same distance. find the rate of the motorboat in calm water and the rate of the current.

**calculus**

How do I integrate 1-e^-kt from 0 to infinity?

**math**

a store clerk has 600 pens in stock . he then issues 1/4 to a store . then issues another 1/6 to another store and 3/8 to the last store how much is still in stock?

**College Chemistry**

correct answer is 0.700 grams

**calculus**

What is hyperbolic sin of n? Never heard of that.

**calculus**

thanks, but can we leave it in that form?

**calculus**

Calculate he average over the given interval: f(x)=e^(-n*x), [-1,1]. I know that the average value = (1/b-a)integrate from a to b f(x)dx

**trig**

Given that sin = 3/5 and lies in quadrant II, find the following value. cos

**9th grade**

Velocity is speed with a direction. In this case, there is no direction, so just put the speed. It would be 200m per 2 minutes = 100m per 1 minuite = 6000. per hour = 6 km h-1 (km/h) will

**science**

how do you find the mass

**chemistry **

In step 1), I balanced the equation to "7C3H8 +22O2 -->> 6CO2 + 28H2O +4CO +11C". Is this not correct, along with the rest of my answer? Excuse the my typo in my original when I put the coefficient for H2O as 284 when it should be 28. Thank you.

**chemistry **

Could someone please tell me if I did this question correctly? An incomplete combustion reaction of 12.125 grams of propane proceeds as follows: 2C3H8 + 11O2 = 3CO2 + 4H2O + 2CO + C(s).How many grams of solid carbon residue are produced as a product? my answer: known: molar ma...

**physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 2.00 m and cross the bar with a speed of 0.71 m/s?

**Human Anatomy**

The large fossa on the anterior aspect of the scapula is the

**Human Anatomy**

Which vertebral curvature abnormality is the most serious? Why?

**6th grade**

what is the equal-area projection

**Human Anatomy**

___________ are multinucleated cells that destroy bone?

**college history**

how did the role of government change in the Progressive era?

**5th grade**

what is a sample question of a complete predicate and a simple predicate

**grammar**

Ray Bradbury is also a writer of science fiction. what is the subject and the simple subject?

**Math**

If it takes 4 people 20 days to build a house, how long does it take 6 people. I know the answer is 15 days, but for the life of me I can't figure out the formula for it.

**4th grade**

how to write a informational report aboutthe duck-billed platypus

**history**

was the british empire a good or bad thing?

**Alegebra**

Give the equation that is parellel to the following lines and passing through the given points: (Y-6) = 4(X=3) (-2,7)

**college math - biostatistics**

hey... first time user and really lost. wondering if someone can help: Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14% of senior citizens (65 years old or older) get the flu each year. However, about 24% of the people under 65 ye...

**algebra II**

Adding Rational Expressions m/p^2 + 3/p^3 - 4

**college algebra**

7x/10 + 18/5

**algebra II**

these are the solutions for the 2 questions

**algebra II**

Adding Rational Expressions 9/xy^3+m - 7ap/xy^3m= x/3+c/y+4/z=

**Math**

Please help me answer this! At 1pm, two trains traveling towards each other leave from towns 312km apart. One train can travel at most 82 km/h, and the other train at most 74 km/h. What is the earliest possible time for the two trains to meet? For this problem: a. define varia...

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