Saturday

April 19, 2014

April 19, 2014

Total # Posts: 672

**chemistry**

Hydrochloric acid can be prepared using the reaction described by the chemical equation: 2 NaCl(s) + H2SO4(l) ----> 2 HCl(g) + Na2 SO4(s). How many grams of HCl can be prepared from 393 g of H2SO4 and 4.00 moles of NaCl?

**Gr. 12 Data MAnagement**

Don't know why, thats just what the back of the book says :s

**Gr. 12 Data MAnagement**

wrong its 210

**algebra word problem**

I still don't understand it

**algebra word problem**

find three consecutive positive numbers such that the product of the first and third minus the second, is 1 more than 6 times the third

**science-chem**

25 mL = .025 L, not .25L

**science**

Use kinematics to calculate the height for the firstball, which is Vf=0 a=9.8 t=1.5 because you take the total time it take to go up and come back down and divide it by 2. 3/2 = 1.5 getting an initial velocity of Voy= 14.7m/s V = t(9.8) = 1.5(9.8) = 14.7 This must have the sam...

**math**

Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 60 mph and Train B is traveling 64 mph. Train A passes a station at 7:15 AM. If Train B passes the same station at 7:45 AM, at what time will Train B catch up to Train A?

**calculus**

Carbon-14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a half-life (the time it takes for half the amount of a sample to decay) of approximately 5730 years. Using this known piece ...

**pre calc**

Find a linear factorization of: f(x) = x^3 + 5x - 6. thanks.

**chemistry**

The oxidation reaction would be K yields K+ + e- (When adding the reduction-half and oxidation-half, the oxidation equation will be multiplied by 2.) Hope this helps.

**Chemistry**

You have to balance the charges of the ions in the compound. Fluorine has a charge of -1, so when magnesium replaces the iron (III), the new compound is MgF2. Now all that is left to do is balance the reaction. The sulfate group has a charge of -2, meaning lithium sulfate is L...

**chemistry**

An aqueous solution with a pH of 3.00 is diluted from 2.0 L to 4.0 L. Wht is the pH of the diluted solution?

**6thgrade math**

yes =}

**com**

Prepare a 1,050- to 1,750-word paper in which you analyze the ethical and legal aspects associated with harrassment, addressing the following topics in your paper: 1.Describe the current moral and ethical issues faced by managers involving your selected topic. 2.Explain how th...

**math**

You can tell this isn't a page dealing with English because no one here knows how to speak it properly.

**Economics (MRS)**

Aargh font didn't come out right. I meant MRS of U(x,y) = (xy)^0.5 (ie sqaure root of xy) and (x+y)^0.5.

**Economics (MRS)**

What is the marginal rate of substitution for U(x,y) = ãxy? ,ã(x+y)?

**boy scouts**

what is the meaning of life

**Calculus**

Evaluate the integral: sin^2(5x)cos^2(5x)dx

**Calculus**

How do I evaluate this integral: x^9cos(x^5)dx Hint: First make a substitution and then use integration by parts.

**Chemistry**

How do I prepare a solution of 0.0025M Fe3+ by dissolving the appropriate amount of ferric ammonium sulfate in 500 cm^3 of 0.0025M sulfuric acid?

**biology**

which objective of a compound microscope would show the largest feild of view

**Math**

How long after 7:30 are a clock's minute hand and hour hand 50 degrees apart? The answer is 17.3 minutes, but I don't know how to get it. Help!

**Math**

The half life of Uranium 230 is 20.8 days. How long would it take for 20% of Uranium 230 to decay?

**Math**

How long after 7:30 are a clock's minute hand and hour hand 50 degrees apart?

**math**

how would you find (4x + 3)squared

**PHYSICS**

A banked circular highway curve is designed for traffic moving at 60 km/h. The radius of the curve is 205 m. Traffic is moving along the highway at 40 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the ...

**AP Physics**

While two forces act on it, a particle is to move at the constant velocity v = (3 m/s) i - (4 m/s) j. One of the forces is F1 = (2 N) i + (- 6 N) j. What is the other force? ( _____ N) i + ( _____ N) j Only two horizontal forces act on a 3.0 kg body that can move over a fricti...

**CHEMISTRY**

I've been trying to do this problem but I would get confused and stuck.. Consider a sample of a hydrocarbon at 0.959 atm and 298 K. Upon combustion the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 1.51 atm and 375 K. This mixt...

**Statistics**

Question 1 Use the following research question and data for questions 1 - 6. A researcher is examining the effects of a computer-based training program designed to teach algebra. The researcher randomly selects subjects for two groups and gives one group the computer training ...

**Math**

WELLIT IS ABOUT WHEN THY WRITE TO ROUND TO THE NEAREST NUMBER THE HAVE TO SAY THOUSND MILLON OR TENS YOU LOOK AT THE NUMBER AND CIRCLE IT

**physics**

Why do we cross multiply. I though you multiply 100 x 5 then 75 x 5 and then divide and multiply by 100

**Math check 3**

(a+15)(a+7)

**anatomy**

what kind of cells would form a scar on the head after cancer had been removed.

**chemistry**

5.2*10^5

**HCA 270 Appendix C**

Im aslost as you

**english**

Which sentence is correct the one with or without the comma? In the beginning there was man. In the beginning, there was no man.

**Physics**

A force of 2.3 N is exerted on a 6.6 g rifle bullet. What is the bullet's acceleration

**physics**

ohh..sorry! It didn't turn out the way I typed it

**physics**

Calculate the energy released in the fusion reaction 2 3 4 1 1 H + 1 H->2 H +0 n. The atomic mass of 3 1 H (tritium is 3.016049 u. I am lost! help please!

**physics**

A sample of charcoal from an archaeological site contains 55 g of carbon and decays at a rate of .877 Bq. How old is it? ok I am totally lost, I don't know where to start

**Physics**

A sample of charcoal from an archaeological site contains 55 g of carbon and decays at a rate of .877 Bq. How old is it? ok I am totally lost, I don't know where to start

**Physics**

I don't know how to get the frequency, I think if I can figure that out I could get the rest, but I am not sure where the two 75 W come in and the 5% like where am I suppose to put them in any equation?

**Physics**

A 75 W light source consumes 75 W of electric power. Typically only about 5% of this energy is emitted as visible light of wavelength 600 nm. (a) Calculate the frequency of the emitted visible light. (b) How many photons per second of visible light does the source emit? (c) Is...

**Physics**

A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20 ms in duration. THe average power expended during each pulse is .600 W. (a) How much energy is in each pulse, in joules and electron volts? (b) What is the energy of one photon ...

**Physics**

What is the thinnest film of a coating with n=1.42 on glass n=1.52 for which destructive interference of the red component (650 nm) of an incident white light beam in air can take place by reflection? I am confused on the n's and I have no idea what equation to use, it see...

**Physics**

Coherent light of frequency 6.32 * 10^14 Hz passes through two thin slits and falls on a screen 85 cm away. You observe that the third bright fringe occurs at +- (plus or minus) 3.11 cm on either side of the central bright fringe. (a) How far apart are the two slits? (b) At wh...

**Physics**

Two small stereo speakers A and B that are 1.4 m apart are sending out sound of wavelength 34 cm in all directions and all in phase. A person at point P starts out equidistant from both speakers and walks so that he is always 1.5 m from speaker B. For what values x will the so...

**us history**

What gropu was largely responsible for funding the builing of the railroad system in the U.S.?

**Physics**

A certain digital camera having a lens with focal length 7.5 cm focuses on an object 1.85 m tall that is 4.25 m from the lens. (a) How far must the lens be from the photocells? (b) How tall is the image on the photocells? Is it erect or inverted? (c) A SLR digital camera often...

**Physics**

You want to take a full length photo of your friend who is 2 m tall, using a 35 mm camera having a 50 mm lens. The image dimensions of 35 mm film is 24 mm by 36 mm, and you want to make this a vertical photo in which your friend's image completely fills the image area. (a)...

**Physics**

You want to take a full length photo of your friend who is 2 m tall, using a 35 mm camera having a 50 mm lens. The image dimensions of 35 mm film is 24 mm by 36 mm, and you want to make this a vertical photo in which your friend's image completely fills the image area. (a)...

**Physics**

A certain digital camera having a lens with focal length 7.5 cm focuses on an object 1.85 m tall that is 4.25 m from the lens. (a) How far must the lens be from the photocells? (b) How tall is the image on the photocells? Is it erect or inverted? (c) A SLR digital camera often...

**science**

Why is the mechanical advantage of an inclined plane less than 1

**Physics**

The crystalline lens of the human eye is a double convex lens made of material haveing an index of refraction of 1.44. Its focal length in air is about 8 mm which also varies. We shall assume that the radii of curvature of its two surfaces have the same magnitude. (a) Find the...

**Physics**

A mirror on the passenger side of your car is convex and has a radius of curvature with magnitude 18 cm. (a)Another car is seen in this side mirror and is 13 m behind the mirror, if the car is 1.5 m tall, what is the height of its image? I can't figure this one out! help p...

**Physics**

my book says the answer is 39 degrees..

**Physics**

If the critical angle for light at an interface between certain substances is 54.2 degrees, what is the polarizing angle at this same interface? I am confused!

**math riddle ALGEBRA WITH PIZZAZZ**

How does a hawaiian baritone laugh? A -low- ha

**Physics**

During 2004, japanese scientists successfully tested two solar sails. One had somewhat complicated shape that we shall model as a disk 9 m in diameter and 7.5 um thick. The intensity of solar energy at this location was about 1400 W/m ^2. (a) What force did the sun's light...

**Physics**

We can reasonaly model a 75 W incandescent lightbulb as a sphere 6 cm in diameter. Typically, only about 5% of the energy goes to visible light; the rest goes largely to nonvisible infrared radiation. (a) What is the visible light intensity (in W/m^2) at the surface of the bul...

**Physics**

Medical x rays are taken with electromagnetic waves having a wavelength around .1 nm. What are the frequency, period, and wave number of such waves? ok I got the frequency as 3 * 10^18 Hz and the wave number as 6.3 *10^10 rad/m but I can't seem to remember how to get period.

**Physics**

In TV picture, faint, slightly offset ghost images are formed when the signal from the transmitter travels to the receiver both directly and indirectly after reflection from a building or some other large metallic mass. In a 25 inch set, the ghost is about 1 cm to the right of...

**Physics**

ok thank you! I wasn't using the right numbers!

**Physics**

When a solar flare erupts on the surface of the sun, how many minutes after it occurs does its light show up in an astronomer's telescope on earth? I am totally confused..help!

**Physics- energy**

Question 1The best way to determine levelness is to see if slope of velocity versus time for both directions are equal but opposite. Question 4:The greatest magnitude of net force is when the cart is going uphill. Uphill has a Net force greater by twice friction. It is not whe...

**cultural diversity**

What is a current issue between Native Americans and the Federal Government. Indentify the legislation that you think is linked to the issue, and explain why you think there is a connection. Help Please!

**Physics**

An inductor used in a dc power supply has an inductance of 12 H and a resistance of 180 ohms and carries a current of .300 A. (a) How much energy is stored in the magnetic field? (b) At what rate is thermal energy developed in the inductor? ok once again I got part (a) .540 J,...

**Physics**

A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25 V, (a) What is the voltage across the secondary coil? (b) what is the effective load resistance of the secondary coil if it is connected across ...

**Physics**

An inductor used in a dc power supply has an inductance of 12 H and a resistance of 180 ohms and carries a current of .300 A. (a) How much energy is stored in the magnetic field? (b) At what rate is thermal energy developed in the inductor? ok once again I got part (a) .540 J,...

**Physics**

A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25 V, (a) What is the voltage across the secondary coil? (b) what is the effective load resistance of the secondary coil if it is connected across ...

**Chemistry**

What is the mass in grams of 1.02X10^24 molecules of NaCl?

**Physics**

A closely wound rectangular coil of 80 turns has dimensions of 25 cm by 40 cm. The plane of the coil is rotated from a position where it makes an angle of 37 degrees with a magnetic field of 1.10 T to a position perpendicular to the field. The rotation takes .06 s. What is the...

**Physics**

A coil of wire with 200 circular turns of radius of 3 cm is in a uniform magnetic field along the axis of the coil. the coil has R=40 ohms. At what rate, in Teslas per second, must the magnetic field be changing to induce a current of .150 A in the coil? I don't know if I ...

**Physics**

ok I am confused, because I have the answer in the back of my book it says it is D/square root of 2

**Physics**

If a magnetic flux passes through a circular coil when its diameter D, what should be its diameter (in terms of D) so that only half as much flux passes through it in the same field? Assume that the magnetic field is uniform over the area in both cases. I am totally lost! I Do...

**english**

Okay. Thank you for your help.

**english**

Do I have to make them specific if that is my top sentence for a paragraph that relates back to this thesis: The characters of the novel demonstrate how misery drives people to do things they would not normally do.

**english**

how can i word this differently: People advise others to stay clear of the horrible consequences of despair.

**English**

Thank u so much. that helped a tons. So the other ones don't need any commas? (that's what i'm worried about). thanks again.

**English**

Can someone please check the grammar in the following sentences. Please. 1. Normally Victor takes pleasure in spending time with his family; however, when he feels down he opts for solitude. 2. The creature begins to feel alone and vows revenge. 3. This is the same creature wh...

**Physics**

An electron beam of a TV picture tube is accelerated through a potential difference of 2.00 kV. It then passes into a magnetic field perpendicular to its path, where it moves in a circular diameter of .360 m. What is the magnitude of the field? I am lost. I keep getting the wr...

**english**

Thanks

**english**

when citing long quotes do i put the parentheses with the page # after the period or before? thanks for ur help.

**English**

thanks

**English**

Is this a strong thesis: The characters of the novel demonstrate how misery drives people to do things they would not normally do.

**English**

does this need a comma: Over six billion souls in the world and they all have something in common. Thanks for ur help.

**Physics**

A beam of protons is accelerated through a potential difference of 0.745 kV and then enters a uniform magnetic field traveling perpendicular to the field. (a) What magnitude of field is needed to bend these protons in a circular arc of diameter 1.75 m? (b) What magnetic field ...

**science**

25. A 34g Cu * 1 mole Cu/ 63.54 which equals .54 26. A

**History**

HOW AND WHY DID WARFARE CHANGE IN THE 20TH CENTURY?

**Physics**

In designing a velocity selector that uses uniform perpendicular electric and magnetic fields, you want to select positive ions of charge +5e that are traveling perpendicular to the fields at 8.75 km/s. The magnetic field availabe to you has a magnitude of 0.550 T. (a) What ma...

**Math**

What is the area of a circle that is 6m in square centimeters

**english**

What does nature is not benign mean?

**Physics**

The internal resistance of a dry cell increases gradually with age, even though the cell is not used. The emf, however, remains fairly constant at 1.5 V. Dry cells must be tested for age at the time of purchase by connecting an ammeter directly across the terminals of the cell...

**Physics**

ok yea! I got it now..I just made a stupid mistake with my algebra! Thank you!

**Physics**

ok I used 1.512 = 1.484[1+ alpha (34-20)] and the answer in the back of my book isn't the answer I am getting

**Physics**

A certain resistor has a resistance of 1.484 omega at 20 degrees celsius and a resistance of 1.512 omega at 34.0 degrees celsius. What is its temperature coefficient of resistivity? ok..I used a temperature equation but I can't get the right answer. so maybe I am doing som...

**Physics**

(a) How much charge does a battery have to supply to a 5.0 uF capacitor to create a potential difference of 1.5 V across its plates? How much energy is stored in the capacitor in this case? (b) How much charge would the batter have to supply to store 1.0 J of energy in the cap...

**Physics**

A 450 uF capacitor is charged to 295 V. Then a wire is connected between the plates. How many joules of thermal energy are produced as the capacitor discharges if all of the energy that was stored goes into heating the wire? I am totally confused I don't even know where to...

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