Tuesday

January 24, 2017
Total # Posts: 1,969

**physics**

An object weighing 325 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 250 N. Immersed in oil, the object weighs 275 N. (a) Find the density of the object. (b) Find the density of the oil.

*December 19, 2010*

**calculus**

Find all the critical numbers for the function f(x) = cube root of 9-x^2. help please?!

*December 17, 2010*

**helping abused children**

here let me help you: The Stubborn Child Law enacted by Massachusetts in 1646 permitted parents to A. use corporal punishment when children disobeyed them. B. keep children out of school if they were needed for family work purposes. C. institutionalize a child born with a ...

*December 16, 2010*

**Principles of finace**

How do you find use the annual net profit with the payables and inventory costs to determine the total annual cost a firm would need to achieve the industry level of operational efficiency?

*December 14, 2010*

**chem**

the ionization energy for atomic hydrogen is 1.31x10^6 J/mol. what is the ionization energy for He^+

*December 14, 2010*

**physics**

A container is filled to a depth of 15.0 cm with water. On top of the water floats a 27.0 cm thick layer of oil with specific gravity 0.800. What is the absolute pressure at the bottom of the container.

*December 14, 2010*

**math**

the sum of two decimal numbers is 3.9. their difference is 0.9, and their poduct is 3.6 what are these two numbers?

*December 14, 2010*

**childhood obesity**

what are some question you can ask to a child that is overweight?

*December 8, 2010*

**Organic Chemistry**

I just finished an organic chemistry lab experiment on separating and analyzing an unknown acid/neutral compound mixture using extraction, recrystallization, TLC, melting point analysis, and IR spectrum. In the instructions, "Obtain an IR spectrum for each of your ...

*December 6, 2010*

**Chemistry**

Use average bond energies to calculate delta Hrxn for C(s)+2H2O(g)-->2H2(g)+CO2(g)

*December 5, 2010*

**english**

like what are some specefic ideas as to what he did to improve them

*December 4, 2010*

**english**

question How would you think a writer would hope to see themselves as a writer in the future? What should they still need to learn to strenghten it to make it better?

*December 4, 2010*

**English 101**

uncanny- to be too strange marvelous- extremely good or great

*December 4, 2010*

**Chemistry Kinetics**

well i guess I need the negative sense it's the reactant -d[H2 + I2]/dt = k[H2]^x[I2]^y is this correct?

*December 1, 2010*

**Chemistry Kinetics**

If I had the equation H2 + I2 --> 2HI could I write the rate of reaction as d[H2 + I2]/dt = k[H2]^x[I2]^y were x is the order of reaction with respect to x and y is just the order of reaction with respect to y thanks

*December 1, 2010*

**math**

why the formula for the area of a trapezoid this A=1/2 x h x(a+b)

*December 1, 2010*

**Pre-Calcs**

Amount after time t A (t) = yobt Where: yo = starting amount b = growth constant (percent remaining) t = number of time units In the 1978 the population of blue whale in the southern hemisphere was thought to number 5000. Since whaling has been outlawed, and an abundant food ...

*December 1, 2010*

**physics**

A 7.2 cm tall cylinder floats in water with its axis perpendicular to the surface. The length of the cylinder above water is 1.4 cm. What is the cylinder's mass density?

*November 30, 2010*

**physics**

What is the apparent weight of a 36 kg block of aluminum (density 2700 kg/m3) completely submerged in a fluid with density 1300 kg/m3?

*November 30, 2010*

**physics**

A single conservative force F = (7.0x - 11)i N, where x is in meters, acts on a particle moving along an x axis. The potential energy U associated with this force is assigned a value of 29 J at x = 0. (a) What is the maximum positive potential energy? At what (b) negative ...

*November 29, 2010*

**physics**

A stone with a weight of 5.38 N is launched vertically from ground level with an initial speed of 25.0 m/s, and the air drag on it is 0.269 N throughout the flight. What are (a) the maximum height reached by the stone and (b) its speed just before it hits the ground

*November 29, 2010*

**chemistry**

Find the pH of a buffer that consists of 1.6 M sodium phenolate (C6H5ONa) and 1.0M phenol (C6H5OH). (pKa of phenol=10.00)

*November 29, 2010*

**Math**

can you explain how you figures out Heather's portion of the bill

*November 29, 2010*

**chem**

What is the volume of 325 mL of a sample of gas at 51.0°C and 710. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.

*November 29, 2010*

**chem**

What is the volume of 325 mL of a sample of gas at 51.0°C and 710. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.

*November 29, 2010*

**chemistry**

NH4NO3(s) H2O(g) + N2(g) + O2(g) Consider the unbalanced equation above. What will be the total volume of gas produced at 720. mm Hg and 570.0°C when 2.50 g of NH4NO3 completely decomposes? Use molar masses with at least as many significant figures as the data given.

*November 29, 2010*

**chemistry**

How many kilojoules of heat is required to completely covert 60.0 grams of water at 32.0° C to steam at 100°C? For water: s = 4.179 J/g °C Hfusion = 6.01 kJ/mol Hvap = 40.7 kJ/mol

*November 29, 2010*

**chemistry**

How many kilojoules of heat is required to completely covert 60.0 grams of water at 32.0° C to steam at 100°C? For water: s = 4.179 J/g °C Hfusion = 6.01 kJ/mol Hvap = 40.7 kJ/mol

*November 29, 2010*

**spanish**

Direct- and indirect-object pronouns combined 8-16 Dos amigas hablan. Completa las oraciones. MARÍA: Juanita, ¿quién ______ mandó las flores? JUANITA: Alejandro ____, ____ mandó. MARÍA: ¿Vas a mostrar ____ a tus papás? ...

*November 29, 2010*

**math**

6+7_<__7+6

*November 22, 2010*

**math**

fill in the correct symbol. < = > 6+7 __ 7+6

*November 22, 2010*

**1st grade**

how i am going to fix this sentence. i go to scott elementary school

*November 22, 2010*

**physical science**

how much power is used to lift a 100-n bucket a distance of 10-m in 12 seconds

*November 21, 2010*

**Physics**

Thanks very much.

*November 21, 2010*

**Physics**

I am doing an assignment where I need to find an example of a spring that is used in a common device. Is a phone chord considered a spring? Thanks for your help.

*November 21, 2010*

**Chemistry**

A quantity N2 of occupies a volume of 1.4L at 290K and 1.5atm . The gas expands to a volume of 3.1 L as the result of a change in both temperature and pressure. I have the find the density of the gas at these new conditions?

*November 20, 2010*

**Algebra**

Please let me know if I figured this out correctly ... 2t + 4 >/= t -t -t 1t + 4 >/= 0 - 4 -4 1t >/= -4 /1 /1 t >/= -4

*November 18, 2010*

**Chemistry**

Calculate the H3O+ concentration and pH of a carbonated beverage that is .10 M in dissolved CO2- (Essentially all of the H3O+ comes from the first stage of dissociation, CO2 + 2H2O = H3O^+ + HCO3-, for which K1 = 4.4 x 10^-7)

*November 17, 2010*

**Science**

Thank you! :)

*November 17, 2010*

**Science**

What do noble gases have in common?

*November 17, 2010*

**PHYSICS !**

Yes thank you so much!

*November 11, 2010*

**PHYSICS !**

If a ball is sliding down a ramp that is on a slant, so that the ball sliding down falls off. Is the speed of the ball constant(meaning staying at the same speed)? or Speeding up? If so, how?

*November 11, 2010*

**ANATOMY**

i found out its Stratified Squamous -___-

*November 11, 2010*

**ANATOMY**

anyone know ?

*November 11, 2010*

**ANATOMY**

Is the lining of the esophagus either : 1) Simple Squamous? OR 2) Stratified Squamous? -Please help . I know it has to be either 1 or 2.

*November 11, 2010*

**Math**

110 X 90/100=99

*November 11, 2010*

**Math**

What is 90% of 110?

*November 11, 2010*

**Teacher Aide**

can you please check my answers to the same test below? it would mean the world to me : ) 1)D 2)D 3)C 4)C 5)B 6)C 7)A 8)C 9)A 10)C 11)D 12)A 13)C 14)D 15)B 16)A 17)B 18)B 19)C 20)C

*November 11, 2010*

**chemistry**

Calculate the mass of ethanol required to heat 200mL of water from 21 degrees celcius to 45 degress celcius

*November 9, 2010*

**english**

what is the game for instance halo about

*November 7, 2010*

**english**

what are some american made video games that are violent besides Grand Theft Auto?

*November 7, 2010*

**Math**

What does it mean if a line in R^3 is parallel to the xy-plane but not to any of the axes. I really don't know what this means in terms of how the parametric and symmetric equations of the line should look. Please help.

*November 2, 2010*

**Math**

What does it mean if a line in R^3 is parallel to the xy-plane but not to any of the axes. I really don't know what this means in terms of how the parametric and symmetric equations of the line should look. Please help.

*October 27, 2010*

**english**

Please help with this assignment!Thanks. I picked "Justice" I want to write about What is the moral aspect of Justice. Tell how can I write like the following below. Have to write like this and don't know how to go about it.Thanks! Definition Read the following ...

*October 26, 2010*

**physics**

A 3.0 m long rigid beam with a mass of 100 kg is supported at each end. An 60 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam? support 1- support 2-

*October 26, 2010*

**English**

Need help with topic "Justice" Need 2 question: is what is the moral aspect of Justice? Research plan: Have investigate my question. I am kind stuck on this topic, please help me to write 3 pages. Thanks.

*October 26, 2010*

**precalc**

find the zeros of the function: f(x)=x^3+2x^2-109x-110 I think I need to factor but everytime I do, it doesn't look right.

*October 24, 2010*

**Math**

I'm doing a vector problem which involves two forces with an angle of 30 degrees between them acting on an object. I think that I should draw my vector diagram with the vectors coming out of the object while my friend thinks that the vectors should point into the object. ...

*October 22, 2010*

**algebra help**

206

*October 21, 2010*

**algebra help**

i think so but the answer suppose to be in the form of x and y

*October 21, 2010*

**algebra help**

so is the answer 50

*October 21, 2010*

**algebra help**

Two motorcyclists start at the same point and travel in opposite directions. One travel 3 mph faster than the other. In two hours they are 206 miles apart. How fast is each traveling? The speed of the slower motorcyclist is ___ mph.

*October 21, 2010*

**physics**

Two children are balancing on a teeter-totter. One child has a mass of 30.0 kg and is sitting 1.3 meters from the pivot. The second child is sitting 0.8 meters from the pivot. What is the mass of the second child

*October 21, 2010*

**physics**

Two children are balancing on a teeter-totter. One child has a mass of 30.0 kg and is sitting 1.3 meters from the pivot. The second child is sitting 0.8 meters from the pivot. What is the mass of the second child

*October 21, 2010*

**physics**

An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm in each of the following ways? 1. straight but 30 degrees below horizonal?

*October 21, 2010*

**physics**

An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm in each of the following ways? 1. straight but 30 degrees below horizonal?

*October 21, 2010*

**Algebra**

To simplify the expression of 4r(3r-7) I came up with 12r^-28r. I cannot take this any further because they are not like terms, is that correct?

*October 20, 2010*

**physics**

A 6.9-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling.Lifted at a constant speed of 2 m/s. If the box is lifted, at constant acceleration, from rest on the floor to a height of 1.5 m ...

*October 20, 2010*

**spanish**

how do i answer these question donde esta la universidad? como es la universidad? cuando es la clase de espanol?

*October 20, 2010*

**spanish help**

so for it the answer would be el or ella

*October 20, 2010*

**spanish help**

What is the spanish equivalent to the following subject pronouns it and we

*October 20, 2010*

**Math/Vectors**

Thanks!

*October 17, 2010*

**Math/Vectors**

If a point on the surface of a sphere with its center at the origin has coordinates (9,4,6) how do you show the radius connecting the origin to this point as a position vector. Is it simply [9,4,6] or is it more complicated than that. Thanks.

*October 17, 2010*

**Math**

I think it's correct. The negative sign in front of the parenthesis was throwing me off. Just need to make sure I'm understanding it correctly.

*October 17, 2010*

**Math**

How about this one? Simplify: -(21k - 3 + 4) - 17k -21 + 3 + -4 - 17k -38k + -1

*October 17, 2010*

**Math**

Just so I know I am understanding this, can you please let me know if I am doing this right? Simplify: 24u - 6(8 - 4u) + 52 24u -48 + 24u + 52 48u + 4 Thanks!!!!

*October 17, 2010*

**algebra**

If f(x)=x^2-x, find the value if x=(2)-2. TIP: x^2 means x squared

*October 17, 2010*

**Math/Vectors**

I need help on a homework problem. "Determine a vector equation for the line perpendicular to 4x-3y=17 and through point (-2,4). The answer in the book is given as [x,y]=[-2,4]+t[-4,3].Isn't the normal to the scalar equation [4,-3] and wouldn't this be the ...

*October 16, 2010*

**Chemistry**

Can someone explain to me what the calorimetry equation - q=(m)(ΔT)(Cp) means exactly, in your own words, and how identifying an unknown metal relates to every day life? thanks

*October 13, 2010*

**math**

y = 2.5 ·4^x as the equation for the blue line shown in the graph, rather than the equation given in your text. Note that your line will now be tangent to the graph at the point ( 0, 2.5 ). Enter the value of c here

*October 13, 2010*

**math**

The population of the town of Missed Chances has, since January 1, 1972, been described by the function P = 30000 ( 1.01 )^t where P is the population t years after the start of 1972. At what rate was the population changing on January 1, 1995? people per year

*October 13, 2010*

**science**

Calculate the molarity of 500. mL of solution containing 21.1 g of potassium iodide

*October 12, 2010*

**Chemistry**

A gas sample is connected to a closed-end manometer. The difference in mercury levels in the 2 arms is 115 mm. What is the gas pressure in torr if the atmospheric pressure is 750. torr?

*October 12, 2010*

**Math**

A lunch box is 30cm long, 14cm wide and 12cm high. The formula for the volume of a box is v=lwh. Find the volume of the lunch box in cubic centimeters. Can you help me to set this up? Thanks!!!

*October 10, 2010*

**math**

find an equation of the line containing the given pair of points. Use function notation to write the equation. (5/7,10/14) and (-1/7,13/14) f(x)

*October 8, 2010*

**math**

how do I solve the equation (y+6) divided by 3- (y-3) divided by2=2

*October 7, 2010*

**chemistry**

At 25 degrees celsius, the dimensions of a rectangular block of gold are 4.42 cm by 3.07 cm by 2.63 cm. The mass of the gold is 689g. I found that the density is 19.3g/cm^3 at 25 degrees but how will the density change if the temperature is increased to 125 degrees?

*September 30, 2010*

**math**

How can you make 7 by only using the digits 1, 2, 3, and 4? You can put two numbers together (ie 12 or 34). You can use the operations: addition, subtraction, multiplication, (NO DIVISION!!), exponents, and parentheses any way you want!! Please help!!!! I also need 13, 17, and...

*September 29, 2010*

**english**

yes and yes

*September 29, 2010*

**english**

yes

*September 29, 2010*

**math**

x=6 so i believe the answer would be 18+12+12 which equals 42 im not for sure though but that's how i think you would do it

*September 29, 2010*

**math**

Thanks!!!!!!!!!!!

*September 29, 2010*

**math**

How can you make 34 by only using the digits 1, 2, 3, and 4? You can put two numbers together (ie 12 or 34). You can use the operations: addition, subtraction, multiplication, (NO DIVISION!!), exponents, and parentheses any way you want!! Please help!!!!

*September 29, 2010*

**math**

I think the formula would be 30=2.25x

*September 29, 2010*

**math**

6r-3=15 -3 -3 __________ 6r=12 then do 12 divided by 6 and the answer is simple!!!!!

*September 28, 2010*

**Teachers Aide/Early Childhood Education and After-**

never mind! omg! i made a huge mistake! don't follow my answers! these are the answers to test #02604200

*September 28, 2010*

**Teachers Aide/Early Childhood Education and After-**

okay, you've got a lot wrong. 1) pg. 59 2) pg. 28,33 3)A 4) pg. 57 5) pg. 16 6) pg. 4-5 7) pg. 26 8) pg. 30-31 9) A 10) pg. 60 11) pg. 2 12) B 13) pg. 8 14) pg. 13 15) D 16) C 17) B 18) pg. 58 19) pg. 36-37 20) pg. 64

*September 28, 2010*

**5th grammar rule**

Blair, Nebraska, and Dana

*September 27, 2010*

**Math**

Just checking to make sure I understand this. Absolute value bars are grouping symbols. Use the order of operations to evaluate the expression -3 + /-x + 2/ when x=12 -3 + /-12 + 2/ = 11 Thanks!

*September 27, 2010*