Saturday

October 22, 2016
Total # Posts: 2,426

**Physics**

A 17 g rifle bullet traveling 220 m/s buries itself in a 3.9 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulum's displacement. Horizantal ____ J Vertical _____ J

*June 6, 2011*

**com 155**

11. rainforest is one word

*May 24, 2011*

**apchem**

can someone explain the synthesis reaction from ethane to acetylene?

*May 22, 2011*

**precalc**

find the domain and range of the following as an inequality and interval notation. y=sqrtx-3 2: y=3x+5 3: y= 2/x-7 4; y=2+sqrt x

*May 4, 2011*

**calc**

x^2=10-4x

*May 4, 2011*

**modeling and equation solving**

using a formla to relate variable quantities associated with the phenomena. a pizza place sells rectangular 18" by 24" pizza for the same price as its large round 24" diameter. if both are the same thickness which option gives you the most pizza for the money.

*May 4, 2011*

**ENGLISH**

1 is A 2 is D 3 I don't know 4 is D 5 is A 6 is D 7 I don't know 8 I don't know I think D 9 is C Hope this helps and next time just ask your teacher she is there to help

*April 28, 2011*

**Physical Science**

The soup in a bowl is too hot to eat. Although there are no ice cubes in the freezer, there are several stainless steel spoons that have been stored in the freezer for several hours. By placing the cold spoons in the hot soup, the soup's temperature is lowered from a ...

*April 28, 2011*

**OChem**

Why would diethylammonium chloride insoluble in ether? Is the only reason why the salt is insoluble because of polarity, or are there other reasons why? Please explain.

*April 27, 2011*

**Ochem**

Diethyl ether is used as a solvent for the reaction of diethylamine with m-toluoyl chloride. Why is a solvent necessary for this reaction?

*April 26, 2011*

**History**

What is the point of this site*

*April 20, 2011*

**History**

what is the point of this class if nobody answers questions but instead says "...no one here will do your homework for you". Study guides and answers do not mean the person will plagiarize your answer. Thanks for the help anyways..

*April 20, 2011*

**Organic Chemistry**

thank you very much for the help.

*April 19, 2011*

**Organic Chemistry**

What advantages does H NMR have over melting point in the determination of purity?

*April 19, 2011*

**Chemistry**

How??

*April 15, 2011*

**chemistry**

P1V1= P2V2 Let P1= P1 (550mL)(P1)= (V2)(22P1) P1 Cancels Out. V2 = 550/22 mL

*April 11, 2011*

**Chemistry**

oops jk wrong one^^^ it's actually 1.4 nm.... sorry

*April 11, 2011*

**Chemistry**

The answer is 1.57 x 10^2 m/s

*April 11, 2011*

**algebra**

Create an equation of a nonlinear function and provide two inputs

*April 5, 2011*

**algebra**

i do not understand how to solve for x and y can someone please explain it to me. an example of the problem i am workin on is 6x-4y=72

*April 3, 2011*

**Spanish**

descansas tocamos practico estudias monto estudio

*March 30, 2011*

**Spanish**

can you check the accent marks. First poem No sé qué te diera, por una mirada… un mundo, por una sonrisa… el cielo, por un beso… ay no sé que te diera por un beso second poem Veo la luna y la luna ve a mí Que Dios bendiga la luna, y ...

*March 30, 2011*

**Spanish **

1.Choose the correct past participle for the Spanish verb cantar. A. canté B. cantaba C. cantado D. canto C is my answer. 2. Choose the correct past participle for the Spanish verb salir. A. salía B. salió C. salido D. sale C is also my answer. Choose the ...

*March 29, 2011*

**Spanish**

The peoms are written that way I'm just not sure of the accent marks of some words. If you can help me,that would be great and also explain the accent marks more. that would help me in future. Thanks! First poem No sé qué te diera, por una mirada… un ...

*March 29, 2011*

**Spanish**

The peoms are written that way I'm just not sure of the accent marks of some words. If you can help me,that would be great and also explain the accent marks more. that would help me in future. Thanks! First poem No sé qué te diera, por una mirada… un ...

*March 28, 2011*

**Physics**

What does the symbols u and u' stand for?

*March 28, 2011*

**Spanish**

i had to listen to an audio of these two poems and type them down. I did that part but I'm not sure of the accent marks of some words. If you can help me that would be great and also explain them to me more like do the meanings differ in the following poems ?? that would ...

*March 28, 2011*

**Spanish**

Can you please help me with this question. 1.Select the correct form for the verb escribir: He doubted the prince wrote stories for children. Dudaba que el principe __ cuentos para ninos A.escribe B.escribia C.escribiera D.escribio

*March 26, 2011*

**chemistry**

123J

*March 25, 2011*

**Spanish**

Can you double check if I followed the directions correctly this time too and the answers were correct. Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentences in Spanish.Be sure the verb is written in the correct...

*March 25, 2011*

**Spanish**

once x cien = mil cien once x cien = Mil ciento which on is right??

*March 25, 2011*

**Spanish **

1. Choose the correct Spanish translation for: “Vincent introduced himself to Rose.” A. Vicente me presentó con Rosa. B. Vicente presentó Rosa él. C. Vicente se presentó con Rosa. D. Vicente me presentó Rosa. 2. Choose the correct ...

*March 25, 2011*

**Spanish( corrected the questions answer.)**

Porque él ya había visto la película, él sabia lo que pasó

*March 24, 2011*

**Spanish**

Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentence in Spanish. 2. Because he had already seen the movie, he knew what happened? El ya sabía lo que pasaba porque ya vio la película. would the ...

*March 24, 2011*

**Physics**

A skier (m=61.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 7.70 m and D = 11.4 m, find H. Find her total kinetic energy as she reaches the ground.

*March 24, 2011*

**Spanish**

Una noche, cuando yo era chica, miré por la cerradura de una puerta y esto es lo que ví: ví una mesa, ví una silla, ví un cojín, y ví una vela. La mesa estaba sobre el piso, la silla estaba sobre la mesa, el cojín estaba ...

*March 24, 2011*

**Spanish (please correct me if I'm still wrong)**

Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentences in Spanish. 12. Maria knew everyone. 13. Because he had already seen the movie, he knew what happened? 14. The student knows the answer. 15. He knows Bach&#...

*March 24, 2011*

**Spanish **

would 3 be like this Lo estudiantes saben la respuesta. and are the rest correct?

*March 23, 2011*

**Spanish **

is this right?? 1- Conocía-- (María conocía a todos) 2- Sabía-- (El ya sabía que pasaba porque ya vio la película) 3-Saben-- (Los estudiantes saben la respuesta) 4-Conoce-- (Él conoce la música de Bach) 5-Sabes-- (¿...

*March 23, 2011*

**Spanish **

Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentences in Spanish. 12. C Maria knew everyone. 13. S Because he had already seen the movie, he knew what happened? 14. S The student knows the answer. 15. C He knows...

*March 23, 2011*

**Spanish**

Conjugate the following irregular verbs in the simple present tense (Indicative).? >> are my answers correct. tener (to have) yo >> tengo tener (to have) nosotros >> tenemos venir (to come) tu >> vienes venir (to come) nosotros >> venimos salir (...

*March 22, 2011*

**Spanish**

Which is the correct substitute for the underlined words? Hablamos de los príncipes.( los príncipes is underlined). A)éstas B)éstos C)están D)éstan El duque ama a la duquesa. ( la duquesa is underlined) A)esta B)estás C)é...

*March 22, 2011*

**Spanish**

It's not url it's a pharagraph. I think it's because I copy pasted it ?

*March 19, 2011*

**(ignore) I cant post because of url dont know why?**

Spanish

*March 19, 2011*

**Spanish**

The following paragraph describes what some may consider to be a typical North American tourist. It reflects one opinion only. North Americans whovisit foreign countries do not commonly fit this description. Read the paragraph. Then write your answersin English on the answer ...

*March 19, 2011*

**Spanish**

? Select the number which best completes this sequence: 200, 400, 600 A. ochocientos <<> my answer B. diez y ocho C. ochenta D. octocientos Which of the following is the Spanish equivalent of 1,946? A. un mil noventa cuatro y seis B. uno nueve cuatro seis C. ...

*March 19, 2011*

**Spanish**

Muchas gracias

*March 19, 2011*

**Spanish**

I'm not sure if this is the proper way to write the numbers in spanish . can you correct any mistakes please. 6. dos x cien = doscientos 7. tres x cien = trescientos 8. cinco x cien = quinientos 9. ocho x cien = ochocientos 10. nueve x cien = novecientos 11. quince x diez...

*March 19, 2011*

**Spanish**

Each of the Spanish sentences below is incorrect in either grammar or meaning. Rewrite each sentence correctly. 1.La princesa todavía canta. The princess used to sing. my answer: La pincesa cantaba. 2.¿Con quién llora la reina? Who does the queen sing with...

*March 19, 2011*

**Spanish**

Each of the Spanish sentences below is incorrect in either grammar or meaning. Rewrite each sentence correctly 1. El rey que canta está tocando el tambor. The king that used to sing is playing the drum. Can you check my answer: El rey que cantaba está tocando el ...

*March 19, 2011*

**Spanish**

Choose the grammatically correct sentence. A. He aquí una blanca cosa. B. He aquí las cosas blancas.<<> my answer C. He aquí unas cosas blanca. D. He aquí la cosas blancas. Can you explain to me the difference between the choices.

*March 18, 2011*

**algebra**

the equation of line is y=mx+c where m is the slope of the lines i.e inclination on x axis . since both the lines have the same slope i.e 2, they r parallel to each other.

*March 18, 2011*

**science**

bcoz of the latitudes and longitudes.

*March 18, 2011*

**Spanish**

Choose the grammatically correct sentence. A. Está cosa es un lápiz amarillo.<<X B. Esta cosa es un lápiz amarillo. C. Esta cosa es una lápiz amarilla. D. Esta cosa es unas lápiz amarilla. <<X Not sure between B or C un or una ??

*March 18, 2011*

**Spanish**

Choose the sentence which correctly says "He doesn't like to eat." A. Gusta no comer. B. El no gusta comer. C. Comer no gusta. D. No le gusta comer.<<?

*March 18, 2011*

**Algebra II**

Thank you c:

*March 17, 2011*

**Algebra II**

I first want to make it clear that I have only taken Geometry, Algebra I, and pre-Algebra. That seemed to clear things up last time. Question: Matt bought a car at the cost of 25,000 dollars. This car's value goes down 15% every year. 1. What is the decay factor? 2. Write ...

*March 17, 2011*

**Spanish**

Choose the sentence which correctly says "The king doesn't like to smoke." A. Al rey no le quiere fumar. B. Al rey no le gusta fumar. C. El rey no gusta fumar. D. El rey no quiere fumar.

*March 17, 2011*

**Spanish **

8 - B Africa doesn't change size, not used as location here. Africa is not as large as Eurasia. 7 - C

*March 16, 2011*

**Spanish **

Because underline doesn't show I will replace the underline with parentheses. I hope it's less confusing. 6. Choose the sentence in which the underlined word is grammatically correct. A. Esta varilla negra (está) parada sobre otra cosa negra. B. Esta varilla ...

*March 16, 2011*

**Spanish (double check my work please)**

the words with ("") are underlined.

*March 16, 2011*

**Spanish (double check my work please)**

Choose the sentence in which the "" word is grammatically correct. A. Esta varilla negra "está" parada sobre otra cosa negra. B. Esta varilla negra "esta" parada sobre otra cosa negra. C. Esta varilla negra "es" parada sobre otra ...

*March 16, 2011*

**Calculus (double check my anser please)**

Evaluate integral e^3x cosh 2x dx. A.1/2 e^5x + 1/2 e^x + C B.1/10 e^5x + 1/2e^x + C<<< my answer C.1/4e^3x + 1/2 x + C D.1/10 e^5x + 1/5 x + C

*March 13, 2011*

**Calculus (Please Check my answers)**

thank you so much MathMate .

*March 13, 2011*

**Calculus (Please Check my answers)**

Find the average value of the function i=15(1-e to the power of -1/2 t) from t=0 and t=4? A.7.5(1+e^-2)<< my answer B.7.5(2+e^-2) C.7.5(2-e^-2) D.7.5(3-e^-2) Find the rms value of the function i=15(1-e to the power of -1/2 t) from t=0 and t=4? A.7.5 sqrt 1+4e^-2 -e^-4 &...

*March 13, 2011*

**Calculus (please check my answer)**

Find the Avrage value of the function i=15(1-e to the power of -1/2 t) from t=0 and t=4? A.7.5 sqrt 1+4e^-2 -e^-4 <<<<not sure though B.7.5 sqrt 4-2e^-2 + e^-4 C.7.5 sqrt 4+4e^-2 - e^-4 D.7.5 sqrt 5-2e^-2 + e^-4

*March 13, 2011*

**Calculus (double check )**

Find the centroid of the area bonded by the parabola y =4-x^2 and the x-axis? A.(0,1.6) <<<< correct? B.(0,1.7) C.(0,1.8) D.(0,1.9)

*March 13, 2011*

**calculus **

Find the area under one arch of a cycloid described by the parametric equations x=3(2theta -sin2theta) & y=3(1-cos2theta) use 0 and pi for te limiting values of. A.9pi B.18pi C.27pi D.36pi

*March 13, 2011*

**Calculus**

Evaluate (integer sign)dx/sqrt9-8x-x^2 A.sin^-1 (x + 4/5) + C B.sin^-1 (x - 4/5) + C C.Ln Sqrt9-8x-x^2 + C D.Ln (-8 - 2x) + C B or C ?

*March 13, 2011*

**Calculus **

1.evaluate (integral sign)x cos 3x dx A.1/6 x^2 sin 3x + C B.1/3 x sin 3x -1/2 sin 3x +C C.1/3 x sin 3x +1/9 cos 3x +C << my choice. D. 1/2 x^2 +1/18 sin^2 3x +C 2.evaluate (integral sign)xe(power of 2x)dx A.1/6 x^2 e(to the power of 3x)+C B.1/2 xe(to the power of 2x)-1/...

*March 12, 2011*

**Calculus (check) **

Evaluate (integer sign)dx/sqrt9-8x-x^2

*March 12, 2011*

**Calculus (check) **

Evaluate ç dx/sqrt9-8x-x^2 A.sin^-1 (x + 4/5) + C B.sin^-1 (x - 4/5) + C C.Ln Sqrt9-8x-x^2 + C D.Ln (-8 - 2x) + C B or C ?

*March 12, 2011*

**calculus**

Thank you.

*March 12, 2011*

**calculus**

Which of the following is a step in evaluating ç(integer sign) cos^2 5x dx A.ç(integer sign) 1 + cos 10x / 2 dx B.ç(integer sign) 1 - cos 10x / 2 dx C.ç(integer sign) 1 + cos 10x / 20 dx D.ç(integer sign) 1 - cos...

*March 12, 2011*

**Calculus (fixed the typo )**

A line rotates in a horizontal plane according to the equation theta=2t^3 -6t,where theta is the angular position of the rotating line, in radians ,and t is the time,in seconds. Determine the angular acceleration when t=2sec. A.) 6 radians per sec^2 B.) 12 radians per sec^2 C...

*March 12, 2011*

**Calculus PLEASE check my work ,**

1.) which of the following represents dy/dx when y=e^-2x Sec(3x)? A.3e^-2x sec(3x) tan (3x)-2e^-2x Sec(3x)<<<< my choice B.)3e^-2x sec(3x)tan (3x)-2xe^-2x sec(3x) C.)3e^-2x sec(3x)tan (x)-2e^-2x Sec(3x) D.)3e^-2x sec(3x)tan (x)-2xe^-2x sec(3x) 2.)calculate dy/dx if...

*March 12, 2011*

**Trigonometry**

I really need help with this trigonometry question.please any help is appreciated. 1.I have to draw the graph of y=cos x from 0deg to 360deg. 2.Be sure to show a table of vales similar to the this table. colum X l colum :y=sinx 0 l 0.00 pi/10 l 0.31 pi/5 l 0.59 3pi/10 l 0.81 ...

*March 7, 2011*

**Calculus 12th grade (double check my work please) **

1.) which of the following represents dy/dx when y=e^-2x Sec(3x)? A.3e^-2x sec(3x) tan (3x)-2e^-2x Sec(3x)<<<< my choice B.)3e^-2x sec(3x)tan (3x)-2xe^-2x sec(3x) C.)3e^-2x sec(3x)tan (x)-2e^-2x Sec(3x) D.)3e^-2x sec(3x)tan (x)-2xe^-2x sec(3x) 2.)calculate dy/dx if...

*March 7, 2011*

**Calculus 12th grade (double check my work please)**

2- given the curve is described by the equation r=3cos ¥è, find the angle that the tangent line makes with the radius vector when ¥è=120¨¬. A. 30¨¬ B. 45¨¬ C. 60¨¬ D. 90¨¬ not sure A or D 2.) which of the following ...

*March 6, 2011*

**Calculus 12th grade (double check my work please)**

1.)Find dy/dx when y= Ln (sinh 2x) my answer >> 2coth 2x. 2.)Find dy/dx when sinh 3y=cos 2x A.-2 sin 2x B.-2 sin 2x / sinh 3y C.-2/3tan (2x/3y) D.-2sin2x / 3 cosh 3yz...>> my answer. 2).Find the derivative of y=cos(x^2) with respect to x. A.-sin (2x) B.-2x sin (x^2...

*March 6, 2011*

**Calculus 12th grade.**

1. A body is moving along a straight line with a velocity which varies according to the equation v=9t^2+2t, where v is in feet per second and t is in seconds. Find the expression for the distance as a function of time. A. 3t^3+t^2+C B. 3t^3+2t^2+C C. 18t+C D. 20t+C My answer ...

*March 5, 2011*

**Calculus 12th grade.**

Find the area lying above the x axis and below the parabolic curve y= 4x -x^2 a.8 b. 8 1/3 c. 10 2/3 d. 16 B or C not sure??

*March 5, 2011*

**12th grade Trigonometry **

Solve this trigonometric equation.give all positive values of the angle between 0deg and 360deg that will satisfy. Give any approximate value to the nearest minute only. 3 sin theta - 4 cos theta = 2

*March 4, 2011*

**Trigonometry(please Clarify)**

Thank you and yes I'm.

*March 4, 2011*

**Trigonometry(please Clarify)**

I posted before ; Write equivalent equations in the form of inverse functions for a.)x=y+cos theta b.)cosy=x^2 my answers were a.) x= y+ cos theta cos theta = x-y theta = cos^-1(x-y) b.) cosy=x^2 cos(y) = x^2 y = Cos^-1(x^2) your post confused me a little. Can you clarify if ...

*March 4, 2011*

**Trigonometry(correction)**

3 sin theta - 4 cos theta = 2

*March 3, 2011*

**Trigonometry**

Solve the following trig equations. Give all positive values of the angle between 0 degrees and 360 degrees that will satisfy each. Give any approximate value to the nearest minute only. 3 sin è - 4 cos è = 2 Can you please help me with this one.

*March 3, 2011*

**Trigonometry (repost Reiny)**

at 1:35am I posted ; Write equivalent equations in the form of inverse functions for a.)x=y+cos theta b.)cosy=x^2 my answers were a.) x= y+ cos theta cos theta = x-y theta = cos^-1(x-y) b.) cosy=x^2 cos(y) = x^2 y = Cos^-1(x^2) your post confused me a little. Can you clarify ...

*March 3, 2011*

**trigonometry (please double check this)**

Answer for b. 29deg 5',239deg 5',38deg 40',218deg 40'. can you plz check if i messed anything.

*March 3, 2011*

**trigonometry (please double check this)**

Solve the following trig equations. give all the positive values of the angle between 0 degrees and 360 degrees that will satisfy each. give any approximate value to the nearest minute only. a.) ( I got confused doing this 1 can you help me with it.) 3 sin theta - 4 cos theta...

*March 3, 2011*

**trigonometry (please double check this)**

""ƒÆ "" is supposed to be theta.

*March 3, 2011*

**trigonometry (please double check this)**

Solve the following trig equations. give all the positive values of the angle between 0 degrees and 360 degrees that will satisfy each. give any approximate value to the nearest minute only. 1. sin2ƒÆ = (sqrt 3)/2 2. sin^2ƒÆ = cos^2ƒÆ + 1/2 3. ...

*March 3, 2011*

**Trigonometry**

Write equivalent equations in the form of inverse functions for a.)x=y+cos è b.)cosy=x^2 (can you show how you would solve) a.) x= y+ cos è cos è = x-y theta = cos^-1(x-y) b.) cosy=x^2 cos(y) = x^2 y = Cos^-1(x^2)

*March 3, 2011*

**geometry **

what are the polar coordinates of the point k(-1,-sqrt3)? a.(2,60deg) b.(2,240deg) << right?

*March 2, 2011*

**geometry **

correct me if I'm wrong please. 7. what is the equation of the line which passes through c(2,3) and has a slope m =1/2? a.)x-2y=-4 <<<<< my choice b.)2x-y =1 c.)2x+y=7 d.)x+2y=8 what is the equation of the line which passes through point d(-4,2) and has ...

*March 2, 2011*

**trigonometry repost .**

This is an outline that i have to use to find the solution of the question. It involves logarithms and half-angle formulas.I have worked though it but got stuck on some parts. I'd like if you look over my work. solve the triangle for which given parts are a=27 ,b=21 ,c=24 ...

*March 1, 2011*

**trigonometry**

that was a typo its 15.5 which makes the log entry correct. =3.22875 log s =1.56229 subtract. -------- 2)1.66646 <<.. then divide by 2 = -------- log r =0.83323 the reason why i posted the out line was because they did not match. and i didn't understand how you got ...

*February 28, 2011*

**trigonometry**

This is an outline that i have to use to find the solution of the question. It involves logarithms and half-angle formulas.I have worked though it but got stuck on some parts. I'd like if you look over my work. solve the triangle for which given parts are a=27 ,b=21 ,c=24 ...

*February 28, 2011*