Tuesday

August 30, 2016
Total # Posts: 943

**Chemistry**

The following information is given for ethanol, C2H5OH, at 1atm: boiling point = 78.4oC Hvap(78.4oC) = 38.6 kJ/mol melting point = -115oC Hfus(-115oC) = 5.02 kJ/mol specific heat liquid = 2.46 J/goC At a pressure of 1 atm, what is H in kJ for the process of condensing a 40.8 g...
*January 24, 2011*

**math 10 **

how do i work out the answer to: "how many integer values are there for k for which 4x^2 + kxy - 9y^2 is factorable?"
*January 24, 2011*

**math**

each box has 10 pencils . how many pencils do 3 boxes have ?
*January 21, 2011*

**math**

how to isolate a variable with a component. 60+80x1 over 2 to the exponent of "T" over 30+20 solve for T
*January 19, 2011*

**math**

how to isolate a variable with a component. 60+80x1 over 2 to the exponent of "T" over 30+20
*January 19, 2011*

**8th grade Math**

You divide by -1
*January 13, 2011*

**Math**

A set of data has a mean of 35 and an outlier of 100. You find the mean without the outlier. Which of the following best describes your new mean?
*January 11, 2011*

**english**

help me please!!!!! The manner in which action is presented indicates verb: mood. tense. voice.
*January 11, 2011*

**calculus**

How do you find the derivative of (-2(x^2+1))/((x^2-1)^2) ? I have the answer which is: (4x(3+x^2))/(x^2-1)^3) I can't figure out my mistake when I'm doing it though. Could you solve it step by step?
*January 6, 2011*

**Social Studies**

How have the uses of Bamboo changed since 1980 until now?
*January 5, 2011*

**MATH**

how do i solve this into a proportion, 3oz for $1.65; 5oz for x dollors
*December 18, 2010*

**Physics**

Consider two vectors where F1 = 40 N, F2 = 57 N, and \theta _{1} = 240o and \theta _{2} = 25o, measured from the positive x-axis with counter-clockwise being positive. What is the magnitude of the equilibriant?
*December 14, 2010*

**8th grade math**

i need help
*December 13, 2010*

**math**

what fraction strips would you use yto find the sum of 3/8 and 4/8? explain
*December 9, 2010*

**cal 1**

Find the dimensions of the rectangle of largest area that has its base on the x-axis and its other two vertices above the x-axis and lying on the parabola. (Round your answers to the nearest hundredth.) y = 7 - x^2
*December 8, 2010*

**Cal**

Find the slope of the tangent line to the curve at (2,1) x/y + x^2y^2 = 6
*December 8, 2010*

**10th grade **

720 grams
*December 7, 2010*

**physics**

A boy pulls his little brother in a little red wagon. He keeps the handle horizontal to the ground. His little brother and the wagon weigh 40 kg. How much tension will the boy have to place on the wagon's handle to get it moving from a standstill?
*December 6, 2010*

**English**

In Invisible Man, the main character disproved of Tod Clifton and didn't like that he was selling sambo dolls. Why would he then make Clifton seem like a hero, and give a grand speech about him at his funeral? Was it because he wanted to impress others with his oratorical ...
*November 27, 2010*

**Physics**

2.23
*November 18, 2010*

**History**

When was the evolution of the socio- political milieu during the colonial period including Protestant Christianity's impact on colonial social life
*November 15, 2010*

**Cal**

A plane flying horizontally at an altitude of 3 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest whole number.)
*November 11, 2010*

**math**

a deposit of $2500 grew to $3325 after six years. what is the final value of a deposit of $7500 at the same interest rate for the same period of time?.
*November 9, 2010*

**Chemistry**

Use a combustion reaction of liquid ethanol in air as a source of work, assuming temperature is 25 deg C, air pressure is 1atm and all products are gases with partial pressures of 10atm each. How high can one lift a 1000kg weight by burning 100g of ethanol? *oxygen is 21% (by ...
*November 7, 2010*

**Physics**

A baseball is popped straight up into the air and has a hang-time of 6.25 s. Determine the height to which the ball rises before it reaches its peak.
*November 1, 2010*

**Chemistry**

you have them in order already, from weakest to strongest.
*October 31, 2010*

**Physics-Kinetic energy**

the only formula you will need for both of these questions is : E = 0.5mv^2 E = kinetic energy (J) m = mass of object (kg) v = velocity of object (m/s) you should be able to go from here, just sub in the values.
*October 30, 2010*

**physics**

use the formula F=ma remember m has to be in kg
*October 30, 2010*

**Earth Science**

the tilt of the earth and the rotation of the earth around the sun. try to picture the scenario, as the earth revolves around the sun with the tilt that it has, half of the year the northern hemisphere will be closer to the sun and the other half of the year the southern ...
*October 30, 2010*

**Physics kinetic energy**

because v is the only thing changing the value of m is not relevant. to find out what would happen to the energy we compare the differences in v ie 10^2 = 100 5^2 = 25 since the new v value is a quarter of the previous value the answer is (d) alternatively, your reasoning ...
*October 30, 2010*

**Physics acceleration**

a = (v-u)/t v = final velocity (m/s) u = initial velocity (m/s) t = time taken for change in velocity (s) a = acceleration (m/s^2)
*October 30, 2010*

**maath**

draw the graph of y = 3^x then look to see where y = 9, this is where 3^x = 9
*October 29, 2010*

**Physics**

On an open-reel tape deck, the tape is being pulled past the playback head at a constant linear speed of 0.372 m/s. (a) If the radius of the film taken up so far (as shown in the upper part of the drawing) is 0.0576 m, find the angular speed of the take-up reel. ____ rad/s (b...
*October 25, 2010*

**geometry**

How would you figure this question out? :The measures of two sides of a triangle are 8 and 11. Use an inequality to express the range of the third side, m.
*October 24, 2010*

**physics**

An electric drill starts from rest and rotates with a constant angular acceleration. After the drill has rotated through a certain angle, the magnitude of the centripetal acceleration of a point on the drill is twice the magnitude of the tangential acceleration. What is the ...
*October 24, 2010*

**Chemistry 1**

What is the minimum amount of a 6.0 M solution of sulfuric acid necessary to produce 25 grams of hydrogen gas if the molar ratio in the chemical reaction is a 1:1
*October 21, 2010*

**Physics**

A force of 165 N is needed to keep a small boat moving at 2.57 m/s. What is the power required to keep the boat moving at the steady speed? >> I understand that P=Fv but I don't understand the second question. If the resistive force of the water increases with the ...
*October 20, 2010*

**Physics**

A force of 165 N is needed to keep a small boat moving at 2.57 m/s. What is the power required to keep the boat moving at the steady speed? >> I understand that P=Fv but I don't understand the second question. If the resistive force of the water increases with the ...
*October 20, 2010*

**MATH**

SHOW IN A SKETCH 3/5 OF AN HOUR
*October 18, 2010*

**Physics**

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*October 15, 2010*

**Advanced Algebra 1**

A polygon has a perimeter of 24mm. Find the new perimeter after a scale factor of 1/4 is applied?
*October 14, 2010*

**College Physics**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96.5 kg. The mass of the rock is 0.250 kg. Initially the wagon is rolling forward at a speed of 0.460 m/s. ...
*October 14, 2010*

**science**

how many hm are in 726.5 dm ?
*October 8, 2010*

**physics**

The drawing shows a version of the loop-the-loop trick for a small car. If the car is given an initial speed of 4.5 m/s, what is the largest value that the radius r can have if the car is to remain in contact with the circular track at all times?
*October 8, 2010*

**CALC**

Ok, I was half right. The formula works for cubes and squares if you think of the area of a square being 4r^2, and the volume of cube being 8r^3, where r is the radius and x=2r
*October 7, 2010*

**CALC**

Nevermind, I lied.
*October 7, 2010*

**CALC**

You have to start from the origin. Try calculating it in terms of r, where x=2r. You will get the right answer
*October 7, 2010*

**Intermediate Algebra**

Determine whether the point (1, 8) is a solution of the system 2x + 6y = 50 10x + 0y = 10 by substituting the point into each equation. So far I have: 2x=6y=50 y=50-2x 10x+10y=10 10x+0(50-2x)=10 10x+0=10 x=10 y=50-2x y=50-2(1) y=50-2 y=48 PLEASE HELP! I'm lost. I've ...
*October 7, 2010*

**Physics**

A) Calculate the mass of the sun from the radius of the earth's orbit (1.50×1011 m), the earth's period in its orbit, and the gravitational constant G. B) What is the density of the sun ? (The sun's radius is 6.96×108 m). Notice how it compares with the...
*October 6, 2010*

**math**

I neeeed help on this problem 3x-5y=7 5x-2y=-1 It's addition method and I can't figure it out plleeaaaassse help me
*October 4, 2010*

**math**

did you hear about...
*October 4, 2010*

**statistics**

Event Probability Too much enamel 0.25 Too little enamel 0.2 Uneven application 0.35 No defects noted 0.42 (1) What is the probability of a paint defect? What is the probability of a paint defect which includes an improper amount of paint?
*September 29, 2010*

**math**

Event Probability Too much enamel 0.25 Too little enamel 0.2 Uneven application 0.35 No defects noted 0.42 (1) What is the probability of a paint defect? What is the probability of a paint defect which includes an improper amount of paint?
*September 29, 2010*

**AP U.S. history**

what additional safeguards were proposed by thomas jefferson and james madison in the virgina and kentucky resolutions, and what werethe implications of these resolutions with regard to the growth of the centeral government?
*September 26, 2010*

**trig**

Let µ be an angle in standard position that contains the point with co- ordinates (-5;-12) on its terminal side. Determine the values of the six trigono- metric functions of angle µ.
*September 23, 2010*

**math**

Assume that there are 13 frozen dinners: 5 pasta, 4 chicken, and 4 seafood dinners. The student selects 5 of them. What is the probability that at least 2 of the dinners selected are pasta dinners?
*September 20, 2010*

**physics**

d=vot+1/2at^2 vf=vo+at V=d/t Use these equations to solve the problem.
*September 19, 2010*

**11th grade**

Angle QRS is a straight angle. If a=2c, c=2b, and b=d/3, what are the values of a,b,c,and d? a+b+c+d = 180
*September 13, 2010*

**space**

How could measuring the orbit of a comet help scientists understand when it will next be visible from Earth?
*September 9, 2010*

**Math**

Draw a number line make sure the following numbers are on your number line 1,472: 1,560: 1,481
*September 9, 2010*

**Math/College Algebra**

1.)Complete the square to find all real solutions of equation 3 x^2 + 4 x - 1 = 0. X1= X2= 2.)\sqrt{7 x - 9} + 6 = 3x there are two solutions 3.)4 <= 5 x - 4 <10 4.)(x/4x-16)-7 = (1/x-4) 5.) (1/R) = (1/R1)+ (1/R2) for R1
*August 29, 2010*

**math**

It's from a website called WebWork where we do the homework on.
*August 22, 2010*

**math**

wow thank you so much! i spent hours on that problem. thanks again for the help.
*August 22, 2010*

**math**

1.)The polynomial 729 x^{3} - 1 y^{3} can be factored into the product of two polynomials, A * B where the degree of A is greater than the degree of B. Find A and B. 2.)The polynomial 16 a^{6} + 8 a^{3}b + 1 b^2 - 49 c^{6} can be factored into the product of two polynomials, A...
*August 22, 2010*

**math**

The polynomial 14 x^3 + 8 x^2 + 21 x + 12 can be factored into the product of two polynomials, A * B where the degree of A is greater than the degree of B. Find A and B.
*August 22, 2010*

**Econ**

1.ÊA production-possibilities curve indicates the:Ê A.ÊCombinations of goods and services an economy is actually producing. B.ÊMaximum combinations of goods and services an economy can produce given its available resources and technology. C.Ê...
*July 11, 2010*

**Chemistry**

0.37 moles of xenon gas (Xe) are captured in a 1.0-L container at 25 degrees celcius. Given the van der Waals constants for Xe, calculate the pressure of Xe gas inside the container?
*July 6, 2010*

**dynamath**

the value of 2 coins is 35 cents. one of the coins is not a quarter. what are the 2 coins
*June 7, 2010*

**chemistry**

a mixture of 3 gases a, b and c is at a total pressure of 6.11 atm the partial pressure of gas a is 1.68 atm, that of gas b is 3.89 atm. what is the partial pressure of gas c?
*May 24, 2010*

**math**

solve this equasion-4x-18+3x+20=4
*May 24, 2010*

**math **

thank ya soooo much...this really helped ;)
*May 20, 2010*

**Integrated Chem/Phys**

If the density of a 225g stuffed plush toy is 1.25g/cm^3 and the water volume in a glass is 25 ml, find the new level of water after the toy is pushed under water. I know that D=m/v so 1.25=225/v so 1.25/225=v so I got .005 which cannot possibly be right. I am obviously doing ...
*May 6, 2010*

**8th grade **

If today is Tuesday, what interger stands for last Sunday
*May 4, 2010*

**Science**

A car is traveling at 15 m/sec. Ten minutes later it is traveling at 70 m/sec. What is the acceleration?
*May 2, 2010*

**5th grade**

i dont know i want u to tell me
*April 25, 2010*

**math**

A rectangular prism with a base area of 38 sq in & height of 9 in is filled to the top with water. The water is poured into fish tank that is 21 in by 8 in and is 10 in tall. How high is the water in the fish tank?
*April 20, 2010*

**college**

Two copper rings are dropped from a region where no magnetic field exists into a region where a strong magnetic field exists. The rings are identical except for a break in one of them. What can happen to the rings' motion as they fall through the magnetic field?
*April 13, 2010*

**physics**

The polar ice caps contain about 2.76E+19 kg of ice. This mass contributes negligibly to the moment of inertia of Earth because it is located at the poles, close to the axis of rotation. Estimate the change in the length of the day that would be expected if the polar ice caps ...
*April 9, 2010*

**physics**

In the figure below, a constant horizontal force Fapp of magnitude 18 N is applied to a wheel of mass 12 kg and radius 0.50 m. The wheel rolls smoothly on the horizontal surface, and the acceleration of its center of mass has magnitude 0.50 m/s2. What is the friciotnal force ...
*April 7, 2010*

**physics**

If a 31.0 N·m torque on a wheel causes angular acceleration 22.0 rad/s2, what is the wheel's rotational inertia?
*April 7, 2010*

**math**

Show 1/4 of a set of 8 counters. How many counters is that?
*April 7, 2010*

**biology**

How could a substance that stops the sythesis of mRNA cause the liver to stop functioning(the death of liver cells)?
*March 23, 2010*

**Object Orientation **

WHAT IS THE MODULARITY IN OOP? AND WHAT IS HIERARCHY? AND WHATS THE DIFFERENCE BETWEEN BOTH AND INHERITANCE?
*March 15, 2010*

**Object Orientation **

Use your own words to describe or Explain the 4 basic principles of Object Orientation. ( Abstraction, Encapsulation, Modularity, and Hierarchy) Thanks for the help
*March 15, 2010*

**physics**

Weight is equal to the mass of the object multiplied by the force of gravity attracting the object. giving the equation W=mg with mass in kg (i)W=2000x9.8 = 19,600N (ii) for this one we need to work out what the force of gravity will be at an altitude of 1000km above the Earth...
*March 10, 2010*

**math**

place each of them on a common denominator of w^2, so it will become (49/w^2) + (8/w^2) = (57/w^2)
*March 9, 2010*

**PHYSICS**

alright then, I'll check out some books. Thanks for your help.
*March 7, 2010*

**PHYSICS**

Can you explain more of the theory side? with the double slit experiment, photoelectic effect, compton effect, reflection, refraction, stuff like that?
*March 7, 2010*

**PHYSICS**

How can an election be particle and a wave at the same time?
*March 7, 2010*

**geometry**

2x-3+4xx+1+2xx-3xx-5
*March 4, 2010*

**4th grade**

what kind of triangle has all 3 angles that are all less than a right angle?
*March 3, 2010*

**physics**

A 3 meter tall 40 degree inclined plane with a coefficient of friction of .3 with a box sliding from its top has this acceleration and final velocity.
*March 1, 2010*

**6th grade**

the industrial revolution helped provide jobs in europe
*February 25, 2010*

**Improving Your Writing**

I am also doing this same exam and confused of all the above! Someone please help us!!!!
*February 24, 2010*

**5th Grade Math**

What website can I go to to help me with my math?
*February 12, 2010*

**arithmetic**

how do you write this as a unit rate 25000/5
*February 9, 2010*

**college physics**

Vector A points in the negative x direction. Vector B points at an angle of 27.0 degress above the positive x axis. Vector C has a magnitude of 20 m/s and points in a direction 39.0 degress below the positive x axis. Given that A+B+C=0, find the magnitudes of A and B.
*February 8, 2010*

**math**

it is given that 'y' is 90% rewriting the equation using this value gives 0.9 = 0.0102x + 0.644 now simply solve for x
*January 28, 2010*

**5th grade**

what do moms use to read?
*January 25, 2010*

**5th grade speeling**

I need the analogy to figure out the word curved
*January 19, 2010*