Friday

November 27, 2015
Total # Posts: 714

**science need help**

2 H2 + O2 = 2H2O 2 grams + 32 grams=_ _ _ _ _grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts. in your response be sure to: include they type of change illustrated in the balanced eqaution explain the conservation ...
*April 1, 2013*

**science need help**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*April 1, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

when 1 gram of water evaporated the volume of the water vapor increases but the mass remains constant. why does the water remain constant i think because the number of atoms remain constant
*March 31, 2013*

**science**

why the tilt of axis causes summer to be warmer than winter in the northern hemisphere i put because the rays of the sun strike the northern hemisphere more directly in the summer. but it could also be because northern hemisphere is closer to the sun in the summer.
*March 31, 2013*

**Chemistry**

Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after the following volumes of HNO3 have been added. a)0.0 mL b)20.0 mL c)25.0 mL d)40.0 mL e)50.0 mL f)100.0 mL
*March 23, 2013*

**English**

What is Positive Adverbs
*March 22, 2013*

**math**

Combine the like terms (6a^4b - 6a^4b) + (ab^3 + 3ab^3) = 0a^4b + 4ab^3 = 4ab^3
*March 16, 2013*

**spanish**

what does ella mean
*March 11, 2013*

**physics**

A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?
*March 10, 2013*

**physics**

A wire that is 70 cm long, carrying a current of 6.5 A, is at right angles to a uniform magnetic field. The magnitude of the force acting on the wire is 0.60 N. What is the strength of the magnetic field?
*March 10, 2013*

**physics**

A wire that is 0.45 m long and carrying a current of 9.5 A is at right angles to a 0.40 T magnetic field. How strong is the force that acts on the wire?
*March 10, 2013*

**physics**

The force acting on a wire that is at right angles to a(n) 0.80 T magnetic field is 2.1 N. The current in the wire is 6.7 A. How long is the wire?
*March 10, 2013*

**physics**

A wire that is 630 m long is perpendicular to a 0.31 T magnetic field. A 1.8 N force acts on the wire. What current is in the wire?
*March 10, 2013*

**physics**

A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?
*March 10, 2013*

**math**

Solve equation for Y 2x + 8y = 6 8y = 6 - 2x y = 3/4 - x/4 Since this is a straight line, we can pick any value for X. Let's say X=2 Then y(2) = 3/4 - 2/4 = 1/4 Now, decrease x by 2, so x=0 y(0) = 3/4 - 0/4 = 3/4 The difference between Y(0) and Y(2) is 3/4 - 1/4 = 2/4 = 1/...
*February 26, 2013*

**MATH**

Change 1.9 hours into a form we can use. Let's break it into two parts. We know 1 hour is easy enough, and that will change the time to 4:05 PM (Subtract 1 hour from 5:05 PM). For the 0.9 hour part, let's change this to minutes. (0.9 hours)*(60 min / 1 hr) = 54 minutes...
*February 26, 2013*

**geometry**

Keep in mind it does not have to be in ratio of 3:4:5 to be a right triangle, it has to make the equation c^2=a^2+b^2 true. Another common right triangle is 5,12,13.
*February 26, 2013*

**geometry**

No...Use c^2=a^2+b^2. Use a= 24, b= 32 and c= 42 (the longest side). Take a^2 + b^2 and see if it eqauls c^2 If it does, it is a right angle. If it does not, it is not a right triange. In this case, it does not, so it is not a right triangle.
*February 26, 2013*

**Algebra**

2X + 1 r 2/(x-3)
*February 25, 2013*

**Algebra II**

1. Multiply out z^2 + 6z + 14z^2 + 84z + 45 = 0 2. Combine like terms 15z^2 + 90z + 45 = 0 3. Use quadratic equation to get both answers for z.
*February 24, 2013*

**chemistry**

A solution is prepared by mixing 50.7 mL of 0.28 M Pb(NO3)2 with 70.8 mL of 1.0 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6 10-5.
*February 21, 2013*

**Math 10**

Yes, you are correct. Key word is circular, so we are talking about a circle. pi = circumference of a circle / diameter --> pi = C / d Solve for C C = pi*d = (3.14) *(10 ft) = 31.4 ft, assuming the approximation of 3.14 for pi.
*February 19, 2013*

**Math 9**

Think of a right triangle. The airport is the vertex of the right angle. Plane A is 70 miles north (Straight up). Plane B is 168 miles East (Straight right). From plane A to B would be side C of the right triange. C^2 = A^2 + B^2 C = sqrt (A^2 + B^2) C = sqrt (70^2 + 168^2) C...
*February 19, 2013*

**Math 5**

No, look at your answer... Your length is 4 times as long as your width... How did you come up with your answer?
*February 19, 2013*

**college algebra**

If X^2-5 is the denom, then the domain would be all X such that the denom does not equal 0. So find when x^2-5=0 x=sqrt(5) (Both positive and negative) So the domain is all real numbers, such that X does not equal +- sqrt (5)
*February 18, 2013*

**chemistry**

Just wanted to say thanx for the help Bob
*February 18, 2013*

**chemistry**

Greg reacts 5.0 moles of hydrochloric acid(HCL)with 1.5 moles of barium hydroxide(Ba(OH)2).Which reagent is the limiting reagent, and which is in excess?If the reagent runs to completion,how many moles of barium chloride(BaCl2)will be produced? CAN SOMEONE PLEASE HELP ME....
*February 18, 2013*

**Chemistry**

Robby if you need more help,type ur question ino the search bar on your computor and a site titled chap15 fd.valenciacollege.edu will come up and it will break down complete indtructions on how to go about figuring out this question.I hope this helps.
*February 18, 2013*

**math**

Convert the 9m of cloth to cm = 900 cm to start with. She has 90 cm of cloth left so she used 900 cm - 90 cm = 810 cm of cloth Let X = cloth for tablecloth Let 2X = cloth for each cushion cover. The equation would be: 810 = X + 4 * 2x 810 = X + 8X 810 = 9X X=90cm 2X=2(90cm) = ...
*February 18, 2013*

**math**

$38.40 = (1-0.40)* Price Price = $38.40 = $64.00 ------- 0.6
*February 18, 2013*

**math**

BAD is correct. It is 84. If you would like to use algebra, do the following: x:= Unit Digit Number y:= Tens Digit Number The units digit is 4 less than the tens digit number so We know that x=y-4 The tens digit is twice the units digit so we know that y=2x Now we can take the...
*February 18, 2013*

**Algebra**

BTW Cassie, please please always remember that pi is simply a circle's circumference divided by it's diameter. For every circle, no matter the size... This is why it shows up in so many formulas for circles, cylinders, cones, etc.
*February 18, 2013*

**Algebra**

Reiny, Agreed, but that is what it appears to be using. I am guessing it was a software program and not the actual computer using that approximation. What really irks me about pi is that most people know it is 3.1415....., but have NO idea what it actually represents....
*February 18, 2013*

**Algebra**

You did the problem correctly. I am not sure how exactly you entered the numbers into the computer for pi, but it looks like with an answer of 24,523.71 the computer used an approzimation for pi based on the fraction 22/7. 22/7 = 3.142857.... If you plug the 22/7 instead of 3....
*February 18, 2013*

**Algebra**

The answer would then be C. 160 cm^3 The Volume of a cone is given by V=(1/3)*pi*r^2*h We know V= 540 cm^3 and that r=15 cm and can plug into the equation to find h. I am going to leave the units off, but you should include it in your work. 540=(1/3)*pi*(15)^2*h Solving for h ...
*February 17, 2013*

**Algebra**

Could Answer c be 160 cm^3 and not 16 cm^3?
*February 17, 2013*

**math**

She could actualy do it several different combinations. 5 quarters, 1 dime, and 10 nickels 4 quarters, 5 dimes, and 7 nickels 3 quarters, 9 dimes, and 4 nickels 2 quarters, 13 dimes, and 1 nickel
*February 17, 2013*

**Math - Please Help**

We know the formula for the Volume of a Right Circular Cone is given by V=(1/3)*pi*r^2*h V=140 in^3 The height of the cone = diameter of the base. The diameter = 2 times the radius, so h = 2r The formula for Volume can now be written as V=(1/3)*pi*r^2*(2r) which simplifies to ...
*February 17, 2013*

**math**

Sharon swims 1/4 of the total route Swim = (1/4)*TotRoute Sharon cycles 3/5 of the remaining route Cycles = (3/5)*(3/4)*TotRoute Notice the 3/4. If she swam 1/4 of the total route, 3/4 of the route remains for cycling and running. Sharon runs rest of the route Runs = (2/5)*(3/...
*February 17, 2013*

**Lang. Arts**

What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A;Miep wants to show Mr. Frank something in the building. B;Mr. Frank wants to live in this building to hold on to his memories. C;The war has ended, but Mr. Frank does not want to ...
*February 11, 2013*

**Physics**

Dave your dealing with Circular motion so you would use this circular motion formula;Ac=Vc2/r 1. In your problem your trying to find the radius. 2. The Ac is already given, but since the problem asks for it not to exceed 6.15 times the free-fall acceleration. You must times ...
*February 8, 2013*

**MATH**

The unit's digit for the number 7^76 is____ ?
*January 17, 2013*

**math**

Aliquot divisors are all the divisors of a number except the number itself. The product of the Aliquot divisors of a number is somtimes equal to the square of the number. The Aliquot divisors of of 12 are 1 ,2 ,3 ,4 ,6. Their product,1x2x3x4x6=144=12*2 is the smallest number ...
*January 16, 2013*

**math**

Since it's just a line, make an x y table of values, plot the points, and connect them with a line. Or you could use transformation rules by moving around the graph of y=x.
*December 5, 2012*

**Science**

If this is a physics question it might be that you should lose mass. Weight can change with location (weight is just the measure of gravity's pull) but mass does not.
*December 5, 2012*

**Computers**

Develop a use case diagram for a department store credit card system. Include at least two actors and four use cases.
*December 2, 2012*

**Physics**

A force of 44.0 N accelerates a 5.0-kg block at 6.3 m/s2 along a horizontal surface. (a) How large is the frictional force? (b) What is the coefficient of friction?
*November 17, 2012*

**4th grade math round off 4,489 to the nearest thousand**

4,500
*November 15, 2012*

**physics**

Storms in the South Pacific can create waves that travel all the way to the California coast, which are 12,000 km away. How long does it take them if they travel at 15.0 m/s?
*November 13, 2012*

**physics**

It changed my theta sign to the è. But those are supposed to be theta.
*November 10, 2012*

**physics**

Consider the 620 N weight held by two cables shown below. The left-handed cable had tension 550 N and makes an angle of è with the wall. The right-hand cable had tension 670 N and makes an angle of è1 with the ceiling. a.) What is the ...
*November 10, 2012*

**physics**

A 0.500 kg is thrown vertically upward from the ground with an initial speed of 12.0 m/s. Define the initial potential energy to be zero on the ground. What are the potential energy and kinetic energy of the ball at 2.50m above the initial position?
*November 8, 2012*

**Physics**

Two acrobats, each of 60.0 kg, launch themselves together from a swing holdings hands. Their velocity at launch was 8.00 m/s and the angle of their initial velocity relative to the horizontal was 46.0 degrees upwards. At the top of their trajectory, their act calls for them to...
*October 26, 2012*

**Physics**

The solid fuel of a 300.kg rocket travelling at 1.64x104 km/h is ignited to correct the rocket trajectory in mid-flight to Mars. 10.00 kg of fuel is burnt in 15.00 s. If the exhaust velocity of the fuel, relative to the rocket, is 2.90x103 km/h, what is the acceleration of the...
*October 26, 2012*

**Physics**

A ballistic pendulum was a device used in the past century to measure the speed of bullets. The pendulum consists of a large block of wood suspended from long wires. Initially, the pendulum is at rest. The bullet strikes the block horizontally and remains stuck in it. The ...
*October 26, 2012*

**Physics**

What would the weight of an object that is 4N on the earth be on the moon (acceleration due to gravity on the moon is 1.62m/s2?
*October 25, 2012*

**Chemisttry**

How would you make 0.1 N HCL using 12M HCL?
*October 23, 2012*

**english**

lol bob !
*October 9, 2012*

**science**

DIS DICKKKKKKKKKKKKKKKKKKKK
*October 8, 2012*

**Physics**

A dog throws a bone into the air at 17.2 m/s...How high will it rise and How long will it take to reach the peak of its trajectory?
*October 2, 2012*

**physics**

An F-14 jet fighter flies horizontally at 200m/s at an angle of 30 degrees above the horizon when it drops parcel from 2400m above the ground. a) How long does it take the parcel to hit the ground? b) How far does the parcel travel in the x-direction, from the time it is ...
*September 29, 2012*

**physics**

A particle travels between two parallel vertical walls separated by 11 m. It moves toward the opposing wall at a constant rate of 5.2 m/s. It hits the opposite wall at the same height. The acceleration of gravity is 9.8 m/s2. a) What will be its speed when it hits the opposing...
*September 12, 2012*

**chemistry**

The speed of a substance is 13.056 m/s. What is the speed in cm/Ms??
*September 11, 2012*

**math**

This question must have been written by someone with a weak command of English. It is a truly terrible question. The "grouping" should have been by section. Based on the wording (and a common understanding of English) there is no reason to find that there are three ...
*August 29, 2012*

**algebra**

Write an algebraic rule to describe the relationship in each table
*August 27, 2012*

**Statistics**

A sociologist is interested in the relations between x = number of job changes and y = annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information. x (Number of job ...
*July 21, 2012*

**Math**

Jeff is changing the shape of his sandbox from 10 feet long by 12 feet wide to a square that has the same area. What is the perimeter of the square sandbox, rounded to the nearest hundredth?
*July 16, 2012*

**statistics**

the mean IQ of statistics teachers is greater than 110. write the existing state and alternative hypotheses.
*July 5, 2012*

**statistics**

how can you reword these research hypotheses to null hypotheses: a. smoking during pregnancy increases the risk of a child being born prematurely. b. regular exercise in older adults decreases blood pressure levels.
*July 5, 2012*

**math statistics**

create a null hypothesis on these research questions: a. what are the differences between emergency room shifts on medication errors? b. On a clinical trial of a new drug what will be the effects over a currently used drug?
*July 5, 2012*

**algebra**

I do not know where to start with this one. Suppose p varies directly as the square of z and inversely as r. If p = 32/5 when z = 4 and r = 10, find p when z = 3 and r = 36.
*June 24, 2012*

**St. John**

What is the greatest 7 digit number without repeating any digit
*June 24, 2012*

**General Chemistry**

substituting all values in the above discussion would yield 131.25 g/mol. This element is Xenon. :D
*June 20, 2012*

**Social Studies**

3. At the Constitutional Convention in Philadelphia, Madison drafted the plan presented by Virginia Governor Randolph, and William Patterson of _______ presented a plan that was similar to the Articles of Confederation. A. Pennsylvania B. South Carolina C. Massachusetts D. New...
*June 14, 2012*

**Chemistry**

What mass of KClO3 must be decomposed to KCl and O2 to give 638ml O2 at 18 degrees Celcius and 752torr?
*June 11, 2012*

**world geography**

5. Medinas capture the unique historical character and social patterns of cities in North Africa and Southwest Asia. Labyrinths of winding alleys and many kinds of souks are typical features. What are souks? A. Sacred sites B. Ethnic quarters C. Bordellos D. Commercial areas
*May 30, 2012*

**trig**

solve equation for the exact solutions if possible put answer in degrees. 2tanx/3-tan^2x=1
*May 30, 2012*

**math**

is (0,4)a solution to y=6-2x?.Explain
*May 9, 2012*

**math**

Carlos hiked 1 and 3/4 miles along a nature trail to a fork in the trial. He than hiked 2 and 1/2 along a path that led to a waterfall. When carlos reached the waterfall, how far had he hiked altogether?
*May 7, 2012*

**physics**

AM radio signals are electromagnetic waves transmitted between frequencies of 550 kHz and 1600 kHz. Find the range of wavelengths for these signals. largest ___m smallest___m
*April 16, 2012*

**Math**

A simple dartboard has three areas the main board has a radius of 9 inches there is a circle with a radius of 5 inches ans the bullseye has a radius of 3 inches What is the proability of a random dart landing inside the bullseye Round to the nearest 1000th
*April 16, 2012*

**physics please help!**

thank you!
*April 15, 2012*

**physics please help!**

find the speed of sound (in m/s) at -35°C at 1 atm pressure in dry air
*April 15, 2012*

**physics**

Explain the Doppler Effect?
*April 12, 2012*

**science**

2. An electric fan having a radius of 0.5 m is running on HIGH. After the LOW button is pressed, the angular speed of the fan decreases to 83.8 rad/s in 17.5 s. the deceleration is 42.0 rad/s2. Determine a) The initial angular speed of the fan b) the linear speed of a point on...
*April 11, 2012*

**math**

solve each triangle. A=45,a=24,b=13
*March 28, 2012*

**Chemistry**

Empirical formula 12.67 aluminum, 19.73 nitrogen, 67.60 oxygen
*March 26, 2012*

**chemistry**

complete KH2PO4(aq)+KOH(aq)
*March 16, 2012*

**physics**

On a wet racetrack, the maximum safe speed, to avoid sliding on a level circular curve with a radius of curvature of 56 m, is 73 km/hr. What is the coefficient of friction between the car's tires and the track surface?
*March 12, 2012*

**Statistics**

A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ___
*March 5, 2012*

**Statistics**

A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ___
*March 5, 2012*

**calculus**

no clue
*February 27, 2012*

**chemistry**

Calculate pH for strong base solution: 15.0 mL of 1.20×10^−2 M Ca(OH)2 diluted to 460.0 mL
*February 26, 2012*

**principles of physics**

6777
*February 22, 2012*

**Psychological Statistics **

A random selection of files from a student counseling center revealed the following reasons why college students seek services: Mental health issues 25 Learning/school issues 15 Relationship issues 5 Other 5 What does it mean to say the files were randomly selected? How would ...
*February 16, 2012*