Tuesday

February 9, 2016
Total # Posts: 2,334

**Physics**

So we did this lab about how we are to measure the half life of the beta decay of indium 116 (the indium 116 is captured by indium 115 and undergoes beta decay to become tin 116. Since the Indium 116 I reused I understand that every time we use it, the indium 116 becomes a ...
*June 17, 2015*

**Physics**

The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 4.00 x 10-6 m^2 is laid on the bridge deck with its ends attached to the towers of the bridge, ...
*June 15, 2015*

**Physics **

What is the significance in the observation of discrete spectral lines in the emission spectrum of hydrogen??
*June 15, 2015*

**Physics**

A converging lens has a virtual object located a finite distance away. Which of the following must be true? (Select all that apply.) a) f > q b) The image is virtual. c) p < 0 d) The image is real. e) p > 0 Hi, can someone explain which is correct or incorrect? Thank ...
*June 10, 2015*

**English**

I am just about the processes of writing a short story and I am looking for a word/phrase that can properly describe a departure, without a destination(I am not going to specify anything to reflect the tone and theme of my story) that is just taken based on whim and for self ...
*June 9, 2015*

**Physics**

A pair of speakers separated by distance d = 0.900 m are driven by the same oscillator at a frequency of 670 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the figure below. (a) How ...
*June 8, 2015*

**Physics**

A pair of speakers separated by distance d = 0.900 m are driven by the same oscillator at a frequency of 670 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the figure below. (a) How ...
*June 8, 2015*

**Physics **

I did a lab about Standing waves on a string and it asked me the following qeuestions: Discuss any errors arising from the method used to establish the standing wave pattern. - I think air resistance, linear density of string is non uniform, tension of the string is not ...
*June 5, 2015*

**Physics **

Suppose you have a string that is being made to vibrate at a specific frequency, f. The speed of waves on the string is v. The length of the string that is vibrating, L, is adjustable. When the length of the string has been adjusted so that the fundamental standing wave ...
*June 4, 2015*

**Physics**

thank you!
*June 4, 2015*

**Physics**

A stretched string is attached to an oscillator. On which of the following quantities does the wavelength of the waves on the string depend? Select all that apply. The choices are: A) The frequency of the oscillator. B) The tension applied to the string. C) The amplitude of ...
*June 4, 2015*

**Math**

Wait! Nevermind, figured it out! Use linear equation right?
*June 3, 2015*

**Math**

Which of the following equations gives the relationship between S and T in the table below? S 1 2 3 4 5 6 T 1 4 7 10 13 16 How do you find equations again?
*June 3, 2015*

**Math**

1. Cate went on a trip of 120 miles at x miles per hour. Returned over same route at 5miles/hour faster than previous rate.If time for return trip was one-third of an hour less than time for the outgoing trip,how do you find x? (Set up the chart right, and used the time column...
*June 3, 2015*

**Math**

PLease explain how to do this Add or Subtract (m^2-m+3)+(m-1)
*June 2, 2015*

**Science**

not sure but I think it is C
*May 27, 2015*

**Math**

I brought a book and paid $1.80 in sales tax. If the tax was 8%, what was the cost of the book. How do I solve this problem?
*May 25, 2015*

**Language Arts**

Each day, Wyatt created both humorous and touching poetry in his attic room. his attic room both humorous and touching poetry Each day in his attic room
*May 23, 2015*

**english**

Please place all of the chairs in the middle of the room.
*May 11, 2015*

**Spanish**

Thank you so much Sra. You are always so kind to help.
*May 2, 2015*

**Spanish**

Sra. does this essay look ok? It is comparing the Hispanic views on death and the US view. Cultura hispana celebra la muerte de muchas maneras, mientras que la cultura americana creo que es demasiado triste para la vida diaria. La vida para los hispanos es difícil. La ...
*May 2, 2015*

**Computer Architecture!! **

How can we find the value in decimal stored in the AC register, after executing the MARIE program
*April 24, 2015*

**Chemistry**

for anyone else needing this info it is b
*April 20, 2015*

**Chemistry**

so is it a b or c
*April 20, 2015*

**Chemistry**

then you must times it by two so it would be .0144
*April 20, 2015*

**Chemistry**

but that is wrong when entered into assignment, what else could it be
*April 20, 2015*

**college algebra**

a chemist needs to prepare 28 ounces of a 8% hydrochloric acid solution. find the amount of 14% solution and the amount of 7% solution he should mix to get this solution.
*April 20, 2015*

**math word problem**

You are in a car. The car begins your journey by traveling 3 miles south in a straight path. The car then travels 9 miles east in a straight path and then turns and travels another 9 miles south in a straight path to end the journey. What is the straight-line distance between ...
*April 16, 2015*

**SOUTH CAROLINA STATE HISTORY**

9. Which event did NOT change the culture of the United States during the early 1920s? (1 point) a. bank failures that closed factories and decreased job opportunities b. installment plans used to purchase expensive consumer goods c. boll weevil infestations which changed ...
*April 15, 2015*

**Economic**

Suppose that Betsy’s utility function is given by the equation U=Y0.3 where Y is measured in thousands of dollars. Betsy’s current job pays her $20,000 per year and she can earn this amount next year with certainty. Betsy is offered a different job but in this new ...
*April 15, 2015*

**Physics**

You have 250 g of water in an aluminium calorimeter with a mass of 125 g. How long will it take to increase the temperature of the water and calorimeter from 20C to 37C if the system is heated by a resistive heating element with 8 V across the resistor and 0.75 A flowing ...
*April 12, 2015*

**English**

What are each of these are like: 1. Control 2. Conformity 3. Equality 4. Individualism
*April 12, 2015*

**Trigonometry (identities) (last help needed)**

I apologize; it is simplifying. The homework is for my identities unit, though. And number 1 does not have a typo. Sorry!
*April 9, 2015*

**Trigonometry (identities) (last help needed)**

1. (2cosx-2secx)(3cosx^2+3secx^2+β) 2. (16tanxsecx-4secx)/(8tanxsecx+4secx) 3.sinxcosx^3+cosx^4 (hint: GCF) 4. (cosβ+sinβ)^2
*April 9, 2015*

**Trigonometry (identities)**

I tried these but for 4 I seemed to get a reasonable answer: cos^2(β)-cot^2(β) How does that look? Please correct me if I'm wrong - it felt too simple.
*April 9, 2015*

**Trigonometry (identities)**

1. (-8cosxsinx+4cos2x)^2 +(4cosx^2+8sinxcosx)^2 2. cos(α-β)cosβ-sin(α-β)sinβ 3. 1+(sinx-cosx)(sinx+cosx) 4. (cosβ-cotβ)(cosβ+cotβ)
*April 9, 2015*

**Physics**

A parachutist drops out of a plane at an altitude of 150m and accidentally drops his camera. If the parachute opens the instant he drops out of the plane and he descents at a constant speed of 6 m/s, how much time separates the arrival of the camera on the ground from the ...
*April 5, 2015*

**Trigonometry (identities)**

Simplify: 1. sin(α+β)+sin(α-β) 2. (-8cosxsinx+4cos2x)^2 + (4cos^2x+8sinxcosx)^2 3. sqrt(sin^4xcosx) * sqrt(cos^3x)
*March 31, 2015*

**chemistry**

Answer is 40.1L. After conversions, plug it all into V=nRT/P
*March 31, 2015*

**chemistry**

Try PV=nRT, where R=0.08206, P=pressure, V=volume, n=moles, and T=temperature. Convert temperature to Kelvin, Torr to atm (pressure), and g to moles (divide by molar mass).
*March 31, 2015*

**Chemistry**

This sounds right to me! Next step to find kJ per gram, would be to convert your J to kJ, and divide by the amount of grams given. This is odd, however, since normally these problems want kJ per mole, not gram. I hope this helps!
*March 31, 2015*

**chemistry**

Keep in mind: n=moles, so divide your grams by molar mass to get moles. Then, as said above, plug everything in. V=nRT/P
*March 30, 2015*

**Chemistry**

Set up: convert units --> PV=nRT --> PV/RT=n --> moles to molecules. (0.993atm*2.00L)/(0.08206*296.15K)=0.08176 mol N2 0.08176 mol*(6.022x10^23 molecules/1 mol)=4.92x10^22 molecules N2 Let me know if this helps!
*March 30, 2015*

**English**

B. It's for sure.
*March 27, 2015*

**math**

The area of a circle is given by the formula A = ðr2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100ð square inches, what is the radius of the original circle?
*March 26, 2015*

**History**

ohhhhh its C xD
*March 24, 2015*

**History**

so A :)
*March 24, 2015*

**History**

South Carolina .
*March 24, 2015*

**History**

Why did the popularity of the Grange decline? a.)Its leaders were weak and ineffective. b.) It became corrupt and lost the farmers' trust.**** c.) It did not address the farmers economic needs. d.) it was not able to obtain political power in the state
*March 24, 2015*

**History**

thank you mrs.sue and reed :) if i have anymore questions do you mind helping ? if not its ok i understand :)
*March 24, 2015*

**History**

so for the last one would it be A ?
*March 24, 2015*

**History**

wait would number 2 be b ? i was confused on that one . and be for the last question also ?
*March 24, 2015*

**History**

im confused about that last one would it be a or b ? and yes for number 1 and im not sure for number 2 because thats the whole question
*March 24, 2015*

**History**

please help i have my answers just not sure if im correct :( what criticism did tillman direct at conservations? a.)they controlled the office of the govnr b.)they didnt think blacks should vote ****** c.)they believed in white supremacy d.)they didnt care about the common ...
*March 24, 2015*

**Spanish**

Hola Sra. Do these look ok? Part I Complete el párrafo por llenar los espacios en blanco con la forma correcta de los verbos entre paréntesis. ¡OJO ! No todos requieren el subjuntivo. Hoy martes estoy en el aeropuerto y tengo que pasar la aduana. El aduana ...
*March 20, 2015*

**Pre-Algebra**

Equation M: y = 3x + 4 Equation P: y = 3x + 7 Which of the following options is true about the solution to the given set of equations? No solution One solution Two solutions Ininite solutions I thought it was infinite solutions but i got the answer wrong.
*March 20, 2015*

**chemistry**

How much energy is needed to completely remove an electron from n = 2 in a hydrogen atom?
*March 18, 2015*

**Spanish**

Thank you so much for your tips. Hopefully these are better. 1. La fiesta se considera excesa pero todo el mundo participa. 2. Se abrazan, celebran y bromean acerca de la muerte. 3. Ella era una buena madre y estaba triste que su hijo era un ladrón. 4. Él pens&...
*March 12, 2015*

**Spanish**

Hola Sra.! Do these look ok? Escriba un párrafo (por lo menos 5 oraciones) para contestar cada una de las preguntas siguientes. 1. Identifique dos temas principales de “The Day of the Dead” por Octavio Paz. El ensayo es sobre la cultura de la fiesta y de la ...
*March 12, 2015*

**math**

Sinx/Cscx -1+sinx/Cscx +1= 2tan^2x
*March 8, 2015*

**social studies. NEED HELP ASAP**

It's restricting their appearance. Thy wear hijabs, and long silk clothing. This is the only one that makes sense. If you read your book, it tells you about women who have jobs. They even gave an example of a woman who is nurse. Also, what Ms. Sue said. They have the right...
*March 6, 2015*

**Chemistry**

i converted from pKa to Ka for all three values. i don't know where to go from there.
*March 5, 2015*

**Chemistry**

Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.250 M phosphoric acid solution. [H3PO4] = ? [H2PO4^-] =? [HPO4^2-]=? [PO4^3-]=? [H^+]=? [OH^-]=? pH=?
*March 5, 2015*

**chemistry**

A container of gas at 24 psi is compressed to one eighth its original volume. What is the new pressure of the gas? Answer in units of psi.
*March 5, 2015*

**chemistry**

A chemist prepares a sample of hydrogen bromide and ﬁnds that it occupies 249 mL at 60◦C and 552 Torr. What volume would it occupy at 0◦C at the same pressure? Answer in units of mL
*March 5, 2015*

**Precalc+trig**

Solve tan(40/90) for the double angle cos(2theta). I know I use the x^2 + y^2 = r^2 formula and cos(2theta) = cos^2theta - sin^2theta. But I don't understand my answer
*March 4, 2015*

**calculus**

Find Indefinite Integral of dx/(x(x^4+1)). I think that Im complicating it too much. I moved the dx out making it 1/(x(x^4+1))dx than 1/(x^5+x)dx. I think i have to use formula indef integral of dx/(x^2+a^2) = 1/a(tan^-1(x/a)) but im stuck i dont know what to do next. I would ...
*March 3, 2015*

**chemistry**

Given the following balanced chemical equation, if 15.4 g AgNO3 are reacted, how many moles of AgCl are produced? 2 AgNO3 + BaCl2 → 2 AgCl + Ba(NO3)2
*March 1, 2015*

**chemistry**

A sample of oxygen that occupies 2.5 × 10−6 mL at 508 mm Hg is subjected to a pressure of 1.2 atm. What will the ﬁnal volume of the sample be if the temperature is held constant? Answer in units of mL
*February 25, 2015*

**Social Studies**

Thank you for the map, Ms. Sue.
*February 25, 2015*

**physics**

Ohh I see the pulling force is 220.5 The frictional force is 66 For the normal force I actually got 367.85 I just don't understand how you solved for acceleration by saying 1/2-1/5*7.96
*February 22, 2015*

**physics**

Sorry I meant 47 kg.
*February 22, 2015*

**physics**

For the frictional force I got 61.4 For the magnitude of the Normal force I got -398.5 and for the amount of force pulling you down the slope I got -250.2 I don't think that's right though.
*February 22, 2015*

**physics**

Oh sorry. To find the frictional force is it (0.18)*(47.0)(9.80)cos37 degrees and the magnitude of the Normal force is (47.0)(9.80)cos37 degrees
*February 22, 2015*

**physics**

Is this right? (45.0)*(9.80)*(sin35 degrees)= a number a number - frictional force = answer
*February 22, 2015*

**physics**

You are skiing and have a mass of 47 kg and are on a slope making an angle of 37 degrees above horizontal. The coefficient of kinetic friction between the skis and the snow is 0.18. What is the amount of force pulling you down the slope? What is your acceleration down the slope?
*February 22, 2015*

**statistics**

I also need help with this question!!!!
*February 22, 2015*

**Spanish**

Thank you Sra. Yes I got the question and answers backwards in part II. SCAMP really helps. I will add that to my notes. Thank you.
*February 20, 2015*

**Spanish**

Hola Sra. Are these correct? Part I Indique si las palabras dadas son sinónimos, antónimos o que no son relacionadas. 1. maletas y equipaje sinónimos 2. despegar y aterrizar antónimos 3. abrochar y confirmar no son relacionadas 4. ida y vuelta sin&...
*February 20, 2015*

**Social Studies**

Women politicians is the answer to 10. -Hijabs are old things that they wore all the time. -the Five Pillars I have no idea. -prayer outside the home is already one thing they do. They prey in the masque.
*February 20, 2015*

**Math Help**

Hi! Can someone please help me with these? Thanks! :) Directions: Look for the direction angle for vector v. If necessary, round your answer to the nearest tenth of a degree. 1.) v = 8i - 10j 2.) w = -4i - 3j
*February 18, 2015*

**Math**

u = <7, -3> and v = <-2, 4>. Find u + 3v.
*February 18, 2015*

**social studies. NEED HELP ASAP**

Thanks for the help. I got 100% The answers are: 1. C 2. A 3. D
*February 18, 2015*

**Chemistry**

1.How much energy is emitted by 1 mol of sodium ions emitting light at this wavelength? Answer in units of kJ. This is what I did for this problem, but my answer is wrong 45.8 mg = 0.0458 g 0.0458 g / (23.0 g/mol) = 0.001991 mol Na 0.001991 mol x (6.02214 x 10^23) = 1.199 x 10...
*February 13, 2015*

**Spanish**

Thank you so much Sra. These all make sense.
*February 12, 2015*

**Spanish**

Sra. Do these look correct? Part I LOS MANDATOS AFIRMATIVOS. Forme mandatos afirmativos directos según el ejemplo: Ejemplo: BUSCARLO (tú) Búscalo 1. CONDUCIR (Ud.) conduzca 2. PREGUNTARLES (Uds.) pregnútenles 3. COMER (nosotros) comamos 4. OLVIDARSE...
*February 12, 2015*

**math**

A bag contains 5 red and 4 green apples. Michael takes one apple at random from the bag. His sister Ashley then takes an apple at random from he bag. What is the probability that the two apples are the same colour? Can you explain to me how to do this please? Do I need a ...
*February 8, 2015*

**social studies**

What's the answer?
*February 3, 2015*

**Physics**

Okay, I understand now. Thank you.
*February 2, 2015*

**Physics**

Thanks. I didn't realize f=ma could be used because of gravity's acceleration.
*February 2, 2015*

**Physics **

A 2.0 kg mass is attached to a string that is 1.0 m long and moves in a horizontal circle at a rate of 4.0 revolutions per second. a) What is the centripetal acceleration of the mass? I converted 4 rev/s to 25.13 rad/s and used the equation: a=rw^2 to get 632 m/s^2 b) What is ...
*February 2, 2015*

**Physics**

A 50 cm diameter wheel rotates through 25 radians. How do I figure out the amount of distance it will move?
*January 29, 2015*

**physics**

With an average acceleration of −1.3 m/s2 , how long will it take a cyclist to bring a bicycle with an initial speed of 13.7 m/s to a complete stop? Answer in units of s.
*January 29, 2015*

**Math**

how would you figure out what % of people have black hair
*January 27, 2015*

**Math **

At a parade 1/4 of the participants have red hair, 1/6 of them have brown hair, and the rest of the participants have black hair. What fraction of the participants have black hair?
*January 27, 2015*

**Math**

Can you please explain how you got 2.4 and we'll keep the posts under Jordan's name. Thank yOU!!!
*January 27, 2015*

**math**

the answer is 7 boards
*January 27, 2015*

**Language arts check work**

I just got a 100% The answers are 1. C 2. A 3. C 4. A 5. A Thanks "Worker", and "Anonymous".
*January 26, 2015*

**Physics**

a batter hits a baseball into the air. If the horizontal component (X-component) of the velocity is measured to be 20.4 m/s, if at it's max height the ball was in the air for 2.5 s, at what angle was the ball hit off the bat?
*January 25, 2015*

**Physics**

a bullet is fired horizontally from the top of a cliff that is 15 m above a long lake. if the muzzle speed is 478, how far from the bottom of the cliff does the bullet strike the surface of the lake
*January 25, 2015*