Thursday

July 24, 2014

July 24, 2014

Total # Posts: 1,339

**physics**

A car travels along a straight stretch of road. It proceeds for 14 mi at 50 mi/h, then 28.3 mi at 48 mi/h, and finally 37.4 mi at 38.3 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h

**Physics**

A baseball pitcher can throw a baseball at a velocity of 44.5 m/s. If the mass of the ball is 0.12 kg and the pitcher has it in his hand over a distance of 1.79 m, what is the average force exerted by the pitcher on the ball?

**physics**

A car travels in a straight line for 4.9 h at a constant speed of 73 km/h . What is its acceleration? Answer in units of m/s2

**physics**

A car travels along a straight stretch of road. It proceeds for 15 mi at 51 mi/h, then 28.2 mi at 44 mi/h, and finally 36.4 mi at 39.3 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h

**physics**

If a race car completes a 3 mi oval track in 50 s, what is its average speed? Did the car accelerate? 1. Yes, the speed changed. 2. No, the speed didn’t change. 3. Yes, the direction of the motion changed.

**physics**

A jet travels at 433 m/s. How long does it take to travel 210 m? Answer in units of s How long to travel 12.4 km? Answer in units of s How long to travel 11 in? Answer in units of s thank you

**SAT algebra**

yeah, don't pay attention to original answerer... they are totally wrong. i'm looking for help too :|

**Physics**

In recent years a number of nearby stars have been found to possess planets. Suppose the orbital radius of such a planet is found to be 5.5 x1011 m, with a period of 1210 days. Find the mass of the star.

**Physics**

A stone of mass 3.2 kg is tied to a string of length 0.9 m, and is swung in a horizontal circle with speed v. The string has a breaking point force of 10.1 N. What is the largest value that v can have without breaking the string?

**Physics**

In the game of baseball, a pitcher throws a curve ball with as much spin as possible. This spin makes the ball “curve” on its way to the batter. In a typical case, the ball spins at about 20.5 revolutions per minute. What is the maximum centripetal acceleration of a ...

**calculus**

So, the question is stating that the time period you are looking for is when the ball is thrown at 1 second and goes to .1 second. So, you want the velocity of the ball at the interval [1,1.1]. Velocity is the change in distance/ change in time. What is the change of the dista...

**AP Chemistry**

What is the weight of 6.3 × 10 21 atoms of phosphorus? Answer in units of g

**College Physics**

A person riding a bicycle on level ground at a speed of 10.6 m/s throws a baseball forward at a speed of 19.1 m/s relative to the bicycle at an angle of 41° relative to the horizontal (x) direction. (a) If the ball is released from a height of 1.3 m, how far does the ball ...

**College Physics**

A cable attached to a block of mass 16.35 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 9.36 N, what is the coefficient of kinetic friction between the block and the floor? not sure how to do this one ... I am thinking I use...

**College Physics**

A hockey puck slides with an initial speed of 43.2 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.036, what is the speed of the puck after 10.4 s?

**College Physics**

A constant force of 2854 N acts on a spacecraft of mass 6100 kg that has an initial velocity of 32 m/s. How far has the spacecraft traveled when it reaches a velocity of 1170 m/s? I used: Vo=32 m/s, Vf=1170 m/s, F= 2854 N, and mass= 6100 kg I then solved for a by taking N/kg.....

**Physics**

A hockey puck slides with an initial speed of 43.2 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.036, what is the speed of the puck after 10.4 s?

**science**

I need a hypothesis that I did not use already to determine which bees will fly further-the older ones or the younger ones.any ideas?

**math solution**

not sure but you can try multiplying all the numbers

**Atomic Number Chem**

The atomic number of fluorine is 9. What is the mass number of a fluorine atom with 8 neutrons?

**physics**

so what is the answer

**Physics/Algebra **

Oh, yes. I am sorry. I am attempting to calculate the height of the fountain. It does indeed seem rather high. But the numbers for my assignment are randomly generated. So that may explain this phenomenon. Thank you for your help.

**Physics/Algebra **

A student walks around a pool and estimates the pool has a circumference of 240 m. Using a protractor the students gages the angle of elevation to the top of the fountain, in the center of the pool, to be 74 degrees.

**Algebra **

Thank you. :D

**Algebra **

Consider the system: 9x-6y=78 -4y-14x=-68 Find X I have attempted to work through the problem three times, and am having difficulty knowing exactly what to do. Thank you for your help. c:

**PHYSICS**

k=2.6*9.8/.05 N/m Make sure you take the difference of the stretched string versus the one without any weight. How long should be x = 4*9.8/k

**chemistry**

HAHAHAHAHAHAHAHA!!!!!!11!1!!one1! thats hilarious... but the answer is -3.2*10^3

**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

**com 155**

11. rainforest is one word

**apchem**

can someone explain the synthesis reaction from ethane to acetylene?

**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

**calc**

x^2=10-4x

**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.

**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

**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 tempe...

**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.

**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?

**History**

What is the point of this site*

**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..

**Organic Chemistry**

thank you very much for the help.

**Organic Chemistry**

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

**Chemistry**

How??

**chemistry**

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

**algebra**

Create an equation of a nonlinear function and provide two inputs

**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

**Spanish**

descansas tocamos practico estudias monto estudio

**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 b...

**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 ...

**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 mun...

**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 mun...

**Physics**

What does the symbols u and u' stand for?

**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 h...

**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

**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...

**Spanish**

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

**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 ...

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

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

**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 foll...

**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.

**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 ...

**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&#...

**Spanish **

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

**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-- (¿...

**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...

**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 (t...

**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...

**Spanish**

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

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

Spanish

**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 s...

**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. diecinuev...

**Spanish**

Muchas gracias

**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 ...

**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...

**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 ...

**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.

**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.

**science**

bcoz of the latitudes and longitudes.

**science**

bcoz of the latitudes and longitudes.

**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 ??

**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.<<?

**Algebra II**

Thank you c:

**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 ...

**algebra **

no

**algebra **

no

**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.

**Spanish **

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

**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 neg...

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

the words with ("") are underlined.

**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 ...

**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

**Calculus (Please Check my answers)**

thank you so much MathMate .

**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 &...

**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

**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)

**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

**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 ?

**Calculus **

C ?

**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/...

**Calculus (check) **

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

**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 ?

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