Tuesday

December 1, 2015
Total # Posts: 2,270

**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*

**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*

**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*

**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*

**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*

**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*

**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*

**Ethics (last question)**

Thank you, Reed!
*January 21, 2015*

**Ethics (last question)**

I'm having a tough time with these two questions. I think I have it, based on the indicator, but I'm not positive that the reason that I listed is correct. Argument: 1) Anything is possible (you agree?) Therefore, it must be possible that something is impossible. This ...
*January 21, 2015*

**Math**

6% of what number is 10 1/2? Who would you solve this question?
*January 21, 2015*

**Ethics**

Thank you Ms. Sue!
*January 21, 2015*

**Ethics**

Are my answers correct? Please help. Thank you! 18-20) Some arguments have complex premises, where too much information is given. Outline the following argument. Some matters of foreign policy are just beyond George W. Bush’s grasp, for, like in the matter of the prison ...
*January 21, 2015*

**velocity**

A 0.156 kg ice puck collides with a 0.170 kg ice puck. Both were originally moving at the same speed. Which one has the larger change in velocity? Or do they have the same change in velocity?
*January 15, 2015*

**Finite Math**

The quantity demanded x of a certain brand of DVD player is 3000/week when the unit price p is $485. For each decrease in unit price of $20 below $485, the quantity demanded increases by 250 units. The suppliers will not market any DVD players if the unit price is $350 or ...
*January 13, 2015*

**physics**

A racing car has a mass of 1970 kg. The acceleration of gravity is 9.8 m/s^2. What is its kinetic energy if it has a speed of 102 km/h? Answer in units of J.
*January 11, 2015*

**Chemistry**

If 0.45 M of ammonia solution has a pH of 9.20, what is the H+ concentration of the solution?
*January 10, 2015*

**Physics and Math**

The given answer is root over 2000
*January 8, 2015*

**Physics and Math**

[a bullet weighing 50gm hits a 10cm wall with velocity 100ms-1 and comes out of the wall. If the frictional force on the bullet while in the wall is assumed to be a constant 2000N then with what velocity does the bullet come out of the wall?
*January 8, 2015*

**Last 3 QUESTIONS !!:( please**

Thank you so much!
*December 23, 2014*

**Last 3 QUESTIONS !!:( please**

I meant 4 and my answers are 1) by approving both through the Compromise of 1877 2) The southern economy was quickly restored to pre-Civil War levels ?? 3) Lincoln read and established the Emancipation Proclamation 4)These amendments were stepping stones to economic equality ...
*December 23, 2014*

**Last 3 QUESTIONS !!:( please**

How did party leaders resolve the disputed election of Rutherford B. Hayes and southern demands for removal of troops in the South? by agreeing to home rule for the South and an investigation into the election practices in several states by disapproving both through the ...
*December 23, 2014*

**Big History Test (Check) Part1.**

Thank you(:
*December 23, 2014*

**Big History Test (Check) Part1.**

Please help me, I tried answering them my best. This isn't all the questions but I wanted to do --> check -- do --> check... then done. PLEASE
*December 23, 2014*

**Big History Test (Check) Part1.**

What was the chief goal of the Compromise of 1850? to resolve Texas's statehood issues to preserve the Union <-- to improve the economy in both the North and the South to preserve the balance between slave states and free states What theory promoted by Congressman ...
*December 23, 2014*

**creative writing**

Your welcome :D
*December 23, 2014*

**creative writing**

What is a Volta? Volta, can be used in reference to any type of literature, but is most frequently used in regard to poems, particularly sonnets. It comes from Italian and quite literally means ‘turn’, which is why you might hear it referred to as ‘the turn’...
*December 23, 2014*

**creative writing**

I think its C) a change or turn in the poem A turn in a sonnet is called a volta. A vital part of virtually all sonnets, the volta is most frequently encountered at the end of the octave (first eight lines in Petrarchan or Spenserian sonnets), or the end of the twelfth line in...
*December 23, 2014*

**Math help...**

I got it its 7/40.
*December 23, 2014*

**Math help...**

The length of a rectangle is 4/5 feet. The width is 5/8 feet. How much greater is the length of the rectangle than the width?
*December 23, 2014*

**Math**

6 9/8 - 25/6 = = 57/8 − 25/6 = ((57 × 6) − (25 × 8)) / (8 × 6) = (342 - 200) / 48 = 142/48 = 71/24 = 2 23/24
*December 23, 2014*

**Math **

13pi/12=________ degrees: Round to the nearest hundredth.
*December 15, 2014*

**Math**

Convert 35 degress to radian measure. Convert 250 degress to radian measure.
*December 14, 2014*

**Spanish**

Sra. are these better? La moraleja de la historia es no tratar de ser Dios. El primer rey trató de engañarle al otro rey en su laberinto. El rey estaba perdido y casi se murió. Se comprometió a castigar al primer rey en su propio laberinto. En su ...
*December 11, 2014*

**Spanish **

Sra. are these correct? Part I ¿Qué harías? Completa las oraciones siguientes en una manera lógica utilizando la forma CONDICIONAL. 1. Si fuera presidente… Si fuera preseident lo haría la gente sea agradable. 2. Si ganara la loterí...
*December 11, 2014*

**Spanish**

Sra. Are these correct? Part I ¿Pretérito o imperfecto del subjuntivo? Llene los espacios en blanco con la forma del PRETÉRITO o el IMPERFECTO DEL SUBJUNTIVO como apropiado. 1. Les pedí a ellos que __________ la factura inmediatamente. pagaran 2. ...
*December 10, 2014*

**Chemistry**

How much heat energy, in kilojoules, is required to convert 48.0g of ice at −18.0 ∘C to water at 25.0 ∘C ? Please show all steps. i don't know where to start
*December 9, 2014*

**math**

nvm
*December 6, 2014*

**math**

so wait what grade are you in because you could help me with something
*December 6, 2014*

**math**

okey you did that right because you already did rounded
*December 6, 2014*

**math**

wait
*December 6, 2014*

**math**

(2.00) (10.00)(2.00)
*December 6, 2014*

**Chemistry**

For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule? helium oxygen carbon lithium Please explain why and thanks
*December 2, 2014*

**Physics**

Thank you
*December 1, 2014*

**Physics**

A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small drain plug right at the bottom edge. When you pull the plug, at what speed does water emerge from the hole? (in m/s) Hint: V = sqrt (2 g H I just don...
*December 1, 2014*