Friday

October 9, 2015
Total # Posts: 409

**science**

a teacher does 140 J of work in 20 s. How much power did he use?
*November 16, 2009*

**science**

in the course of a short race,a car does 50,000 J of work in 7 s. What is the power of the car during a race?
*November 16, 2009*

**science**

a libraian lifts a box of books that weighs 93 N a distance of 1.5 m. How much work does he do?
*November 16, 2009*

**science**

as you push a lawnmower the horizontal force is 300 N. If you push the mower a distance of 500 m, how much work do you do?
*November 16, 2009*

**science**

dr.bob222 i dont get it can u give me the answer
*November 15, 2009*

**science**

how much power, in watts, is needed to cut a lawn in 50 min if the work ivolvled is 100,000 j
*November 15, 2009*

**science**

how much power, in watts, is needed to cut a lawn in 50 min if the work ivolvled is 100,000 j
*November 15, 2009*

**science**

suppose you are pulling a wagon with the handle at an angle. How can you make your task easier?
*November 15, 2009*

**social studies**

why did the us want to build a canal across panama 2 how did the us gain control of the panama canal zone 3 how did the people of panama feel about us control of the canal zone why 4 what agreement did the us make with panama in 1977 5 what are the countries of central America
*November 9, 2009*

**english **

were public places segregated in 1948
*November 9, 2009*

**science **

what is orbital motion and lubricant
*November 8, 2009*

**science8 intergeted **

what is lubricant and orbital motion
*November 8, 2009*

**chemistry, science**

Carbon is also removed from the atmosphere during the process of weathering. carbon dioxide combines with water to form carbonic acid. this reacts with calcium silicate (in rocks) to produce calcium ions, bicarbonate ions and silicon dioxide (silica) the chemical equation for ...
*November 2, 2009*

**physics**

1008176.54J
*October 28, 2009*

**General Chemistry**

Question 1: In the Balmer-Rydberg equation, what value of m is used to determine the wavelengths of the Balmer series? m=? Question 2: List a possible set of four quantum numbers (n,l,ml,ms) in order, for the highest energy electron in gallium,Ga.
*October 25, 2009*

**science **

what factors affect the friction forces between two surfeces 2a what is the law of universal gravitation
*October 20, 2009*

**science**

1a-b)what are the four types of friction what factors affect the friction force between two surfaces
*October 20, 2009*

**Math Data Management**

In how many ways can the 12 members of a volleyball team line up, if the captain and assistsant captain must remain together? Thank you in advance.
*September 21, 2009*

**French**

Some interesting facts about the euro tunnel, the eurostar and the shuttle?
*September 16, 2009*

**english**

thank u
*September 15, 2009*

**english**

Ihave just read me it is a disaster,sorry for the errors
*September 15, 2009*

**english**

Dear americans,I would like to retranscribe me the speech of obama in high school in Norfolk (video is on youtube) please make it for a French desperate person (it is my first year at high school) what methods shall I be able to use to understand English better?
*September 15, 2009*

**tech**

in tech we are reasearching inventors chefs and designers i chose to research, Gordan Ramsey i have all ready found out most of my info which i need to collect but i am having trouble with, .who is his inspieation. and .why did he become a chef.
*September 4, 2009*

**Trig problems**

Part 1) Evaluate tan 7.5 Part 2) Evaluate exactly cos (-(45pi(4)))
*August 14, 2009*

**French 2 help!**

okay, thanks, it was right
*August 13, 2009*

**French 2 help!**

Jen e veux pas savoir ____ est arrive. a. ce qui b. ce que Je crois _____, je vois, C'est tout. a. ce qui b. ce que I think 1 is a and 2 is b... am I right?
*August 13, 2009*

**Math**

In a random sample of 30 tires of the same type, it is found that the average life span is 36,200 miles with a standard deviation of 3800 miles. Find the interval about the sample mean such that the probability is 0.77 that the mean number lies within the interval. a. 35,402-...
*July 3, 2009*

**Math-stats**

thanks
*July 2, 2009*

**Math-stats**

The playing times of 20 songs on a top-hits radio station are recorded in the chart below. Playing Time (minutes:seconds) 3:32 3:24 2:54 3:07 4:52 3:45 2:39 3:09 3:34 3:26 3:35 4:17 4:03 3:52 5:10 4:59 3:07 4:00 3:07 2:56 In a histogram of this data, which bar would have the ...
*July 2, 2009*

**Math**

Use the first five terms of the trigonometric series to find the value of sin pi/12 to four decimal places. a. 0.2618 b. 0.2588 c. 0.7071 d. 0.2648 I got B, is this right?
*June 27, 2009*

**math**

I get confused with negatives sometimes! thanks though!!
*June 24, 2009*

**math**

Simplify: (-1-2i)+(4-6i) I get 3-8i and 5-8i... confused, which one is it?
*June 24, 2009*

**sience**

does anyone know if, orange juice is a pH indicator??
*June 22, 2009*

**sience**

ok thanks!! you have been a great help [x]
*June 22, 2009*

**sience**

i need to make a p.h indicator in sience but i cant think of any other than.. tea bags, some sort of juice and.. red cabbage anyone got any sujestions?
*June 22, 2009*

**Spanish**

Come up with a question to these answers. Si, de Alicante. No, es médica. No, es argentina.
*June 18, 2009*

**Math**

Write the standard form of the equation of the parabola whose directrix is x=-1 and whose focus is at (5,-2)? a) (y+2)^2 = 12(x+2) b) y-2 = 12(x+2) c) x+2 = 1/12(y+2)^2 d) x-2 = 1/12(y+2)^2 I get A and D? confused!
*June 17, 2009*

**Math**

oohh yes i did! thanks!!
*June 16, 2009*

**Math**

oh, so it is C?
*June 16, 2009*

**Math**

For 4x^2 - 4xy + y^2 = 4 find θ, the angle of rotation about the origin, to the nearest degree? a) 27° b) 63° c) 333° d) 307° I got A, is this right?
*June 16, 2009*

**Algebra**

inead help on math homwork
*June 14, 2009*

**Math**

oh! thanks for your time!
*June 9, 2009*

**Math**

tan^-1(1/2)=x=.463648 tan^-1(2/3)=y.588003 x+y+pi/2 = -z=2.62245 z=-2.62245 cos (z) = -.868243 and tan a= -1/2 tan b= -2/3 tan (a+b)=(tan a +tan b)/(1-tan a.tan b) so tan (a+b)= -7/4 sec^2 x-tan^2 x=1 so sec (a+b)=√(1+49/16) =√(65/16) (a+b)=1/sec (a+b) so cos(a+b) ...
*June 9, 2009*

**Math**

ohh okay thanks!
*June 9, 2009*

**Math**

If α and β are two angles in Quadrant II such that tan α= -1/2 and tan β = -2/3, find cos(α+β) Work: cos(α+β) = [ 1 - (tan α)(tan β) ] / [ 1 + (tan α)(tan β)] cos(α+β) = [ 1 - (-1/2)(-2/3) ] / [ 1 + (-1/2)(-...
*June 9, 2009*

**Math**

thanks for checking (;
*June 8, 2009*

**Math**

Find the measure of the reference angle for 400 degrees. I did the work and got 40 degrees, is this right?
*June 8, 2009*

**Math**

Thanks for checking!
*June 8, 2009*

**Math**

Find sin(sin^-1 1/4) is the answer 1/4?
*June 8, 2009*

**Math**

never mind, i was right
*June 3, 2009*

**Math**

Write an equation in slope-intercept form of the line whose parametric equations are: x = (1/2)t +2/3 and y = t - 3/4. a) y = 2x - 7/12 b) y = 2x + 7/12 c) y = -2x - 7/12 d) y = -2x - 25/12 I think it is D.....?
*June 3, 2009*

**Math**

thanks for checking!!
*June 2, 2009*

**Math**

Find the ordered pair that represents the vector from A(-4.3,-0.9) to B(-2.8,0.2)? Then find the magnitude of AB. A. (1.5,1.1); 3.46 B. (-7.1, -0.7); 7.13 C. (1.5, 1.1); 1.86 D.(-7.1, -1.1); 7.18 I got C, is this right?
*June 2, 2009*

**Math**

okay thanks
*June 2, 2009*

**Math**

Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3x-y=1 and x+y=-2. a. (3√2 +√10)x-(√10 + √2)y-2√10+√2=0 b. (3√2 - √10)x+(√10 - √2)y+2√10+√2=0 c. (3√2...
*June 2, 2009*

**Math**

oh okay, thought so thanks!
*June 1, 2009*

**Math**

Find the distance between P(-4,3) and the line with equation: 2x - 5y = -7 a. (14√29)/29 b. 0 c. (-16√29)/29 d. (16√29)/29 I got C but would it be positive, like D?
*June 1, 2009*

**English**

well you could do a little of both by saying a catchy sentence and then stating more of the facts
*June 1, 2009*

**Math**

no those are the options for sure :/
*June 1, 2009*

**Math**

it's B?
*June 1, 2009*

**Math**

Use a sum or difference identity to find the exact value of sin225° a. (-√2 - √6)/4 b. (√6 - √2)/4 c. (√6 + √2)/4 d. (√2 - √6)/4 is it A?
*June 1, 2009*

**math**

Yes thanks! I got sqrt10/2 also!!
*June 1, 2009*

**math**

I did the theorem and got 16/√10 ?
*June 1, 2009*

**math**

Find the distance between the lines with equations 3x-y=9 and y=3x-4 a. 5/4 b. (5√10)/2 c. √10/2 d. (13√10)/2 not too sure on this one!
*June 1, 2009*

**Math**

so would 2. be C as well?
*May 29, 2009*

**Math**

The paddle wheel of a boat measures 16 feet in diameter and is revolving at a rate of 20 rpm. The maximum depth of the paddle wheel under water is 1 foot. Suppose a point is located at the lowest point of the wheel at t=0. 1. Write a cosine function with phase shift 0 for ...
*May 29, 2009*

**Math**

thanks
*May 29, 2009*

**Math**

Write an equation of the tangent function with period (3π)/8, phase shift -π/5, and vertical shift -2. a. y=tan((8x)/3 - (8π)/15) -2 b. y=tan((8x)/3 + (8π)/15) -2 c. y=tan((16x)/3 +(3π)/80) -2 d. y=tan((8x)/3 - (3π)/40) -2 I think it is A... or B?
*May 29, 2009*

**math**

In triangle ABC, a=7.8, b=4.2, c=3.9. Find B a. 15.1° b. 148.7° c. 78.9° d. 16.2 ° It is D, right?
*May 28, 2009*

**spelling**

thank you
*May 28, 2009*

**spelling**

If i wanted to shorten the word phenomenal to phenoms would it be es or just s on the end.
*May 28, 2009*

**advanced math**

thought so, thanks!
*May 28, 2009*

**advanced math**

If 0°<= 360°, solve the equation, sec x=-2 a. 150° and 210 ° b. 210° and 330° c. 120° and 240° d. 240° and 300° I believe it is C. am i right?
*May 28, 2009*

**math (matrices)**

Find the values of x and y for which: [2y+5] [x-1] [y - 2] = [ 3x ] is true. a. (-1, -1) b. (-2, -4) c. (5, 1) d. (-1, 4) I got B...?
*May 24, 2009*

**French1**

Complete with the correct form of the partitive. -Benoit va au marche. Il achete _____ fromage. would it be du? -Il achete _____ poires. would it be des?
*May 8, 2009*

**French 1**

oui, merci
*May 8, 2009*

**French 1**

Rewrite the following sentences in the negative. -Je suis de Paris. Would it be: Je ne suis pas Paris. -Michelle est americaine. Would it be: Michelle n'est pas americaine. Am I wrong??
*May 8, 2009*

**grammar**

You said either "the" or "those" would be correct. Why was I be marked wrong for using "the"?
*May 7, 2009*

**grammar**

I was marked incorrect for using the. Any ideas?
*May 7, 2009*

**grammar**

Do you change them to the or those? I think it is the, but I am not sure. Later we cooked them fish and talked about the excitement of the day.
*May 7, 2009*

**grammar**

thank you.
*May 7, 2009*

**grammar**

Then I would go with no change. Correct? Thanks.
*May 7, 2009*

**french**

______ l'equipe ja ponaise a tres bien joue a. Tout b. Toute c. Tous d. Toutes I think it is A? On annonce le de'part de _____ vol? Le vol a destination de Paris? a. quel b. quelle c. quels d. quelles is it A?
*May 5, 2009*

**french**

merci beaucoup!
*May 5, 2009*

**french**

Le train part _____. a. da la voie b. du chariot c. la queue I think it is A?
*May 5, 2009*

**Calculus**

The problem I have is a summation from 1 to infinity for (-1)^n/n. I have to find a partial sum that is in 0.001 of the infinite sum, my teacher says the fourth partial sum approximates the infinite sum, which is -7/12. I think to get within 0.001 of the infinite sum, do I ...
*May 5, 2009*

**french**

merci!
*May 4, 2009*

**french**

Le train arrive et les voyageurs montent _____. a. sur la voie b. en voiture c. devant la gare d. au kiosque I know it isn't d.... not sure though! Le train arrive Presque toujours _____. a. en retard b. a l'heure c. le matin d. l'horaire is it b....?
*May 4, 2009*

**French**

Je descends _____. a. au kiosque b despuis 45 minutes c. au prochain arrete d. a la boucherie I think it is c or b?
*May 4, 2009*

**french**

merci!
*May 4, 2009*

**french**

Choose the correct noun that matches the stated verb below. Choisir a. la fin b. un choix c. la vue d. un atterrissage Is it b? Voir a. la fin b. un choix c. la vue d. une croyance Is it C?
*May 4, 2009*

**French 1**

yes very true! Merci!
*May 4, 2009*

**French 1**

So 1 is A and 2 is A?
*May 4, 2009*

**French 1**

C'est _____ voie? a. quelle b. quelles c. quel d. quele Is it C? Tu voyages avec ______ compagnie aerienne? a. quelle b. quelles c. quel d. quele Is it B?
*May 4, 2009*

**French 1**

merci beaucoup!
*May 3, 2009*

**French 1**

Ils regardent les vetements pour hommes dans ______ de la boutique. a. la caisse b. les soldes c. al vitrine d. au rayon I am thinking that it is c or b??? La Martinique est dans la mer _____ Antilles. a. de b. des c. de l' d. de la is it b?
*May 3, 2009*

**Chemistry**

I need help with the following problem: A fabric remnant from a burial site had a 14 C:12 C ratio of 0.838 of the original value. How old is the fabric? (half-life of 14 C = 5370 years)
*April 29, 2009*

**English- Medieval Period**

this was the only one I missed. Thanks for all help though! It was C. loyalty.
*April 23, 2009*

**English- Medieval Period**

it should say all of the above for D So it is D then?
*April 23, 2009*