Friday

March 27, 2015

March 27, 2015

Total # Posts: 2,436

**Science**

For million of years, wind and rain have worn down the earth. The land is not totally level now because ____. a. other forces keep building up the land b. wind and rain cannot erode solid rock c. for most of those years, wind and rain were scarce d. wind and rain pile dirt ...
*February 24, 2011*

**Physics**

A block is released from rest at the top of an incline which makes a 30 degree angle with the horizontal. The incline is 12 m long and it takes the block 25 seconds to reach the bottom. What is the coefficient of kinetic friction, between the block and the incline?
*February 24, 2011*

**Chemistry**

The mass of the solution will change as a result of the newly added substance. Because of colligative properties, anytime something is added to solution, the freezing point is lowered and the boiling point is raised. Water does not conduct electricity on its own, and since ...
*February 23, 2011*

**Math**

Regina worked in the garden, she spent 1/4 hour planting beans, 3 3/4 minutes staking tomato plants, and 1/2 hour training the cucumber vines. How much time did she spend gardening? Explain your answer.
*February 22, 2011*

**calculus**

find the derivative of 3/ln(3z)
*February 20, 2011*

**Yr 10 English URGENT**

My last name starts with a B......
*February 20, 2011*

**Yr 10 English URGENT**

HEY SHIVI! I made it up on the day. I made something up about a boat about 2 sink and I was about to die. Nice story though. What did u get for it?
*February 20, 2011*

**Chemistry**

What's the relationship between ionization energy and electron affinity? I ionization eneergy deals with losing electrons and electron affinity deals with gaining electrons, but I don't know how to explain the relationship.
*February 18, 2011*

**Chemistry**

Explain which atom of the following pair have the smaller ionization energy: As, I
*February 18, 2011*

**Physics**

A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.93 V and a current of 2.7 A are induced in the coil. The wire is the re-formed into a single-turn square coil, which is used in the same ...
*February 18, 2011*

**Physics**

Yes, that's the question, but I'm confused as to how I should find the length.
*February 17, 2011*

**Physics**

A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.93 V and a current of 2.7 A are induced in the coil. The wire is the re-formed into a single-turn square coil, which is used in the same ...
*February 17, 2011*

**bookkeeping**

just because someone ask for advice/a little help on an answer doesnt mean she/he is cheating
*February 15, 2011*

**Calculus**

find derivative of w(x)= (23e^x)/4^x
*February 14, 2011*

**Calculus**

f(t)=-4.9t^2+25t+3 meters what is the average velocity during the first two seconds? find the instantaneous velocity at t=2
*February 13, 2011*

**Physics**

A duck on a pond paddles 20 m [36Ëš N of E] and then paddles another 60 m[25ËšE of S]. Determine the duckâ€™s total displacement.
*February 13, 2011*

**Calculus**

find dz/dx when z= (ln 5)e^x
*February 10, 2011*

**Social Studies**

It is but I read through the section twice and I couldn't find anything that helped.
*February 9, 2011*

**Social Studies**

How was the culture of the Ottoman rulers similar and different from the cultures of the people they ruled in Southwest Asia? Plase help me with this question its confusing me so much!
*February 9, 2011*

**Physics - Please Help**

Two cars are moving. The first car has twice the mass of the second car but only half as much kinetic energy. When both cars increase their speed by 3.41 m/s, they then have the same kinetic energy. a) What is the original speed of the first car? b)What is the original speed ...
*February 8, 2011*

**pre-algebra**

If I have Y=-3X+21 do i simplify or keep it just the same???
*February 8, 2011*

**pre-algebra**

If I have Y=-3X+21 do i simplify or keep it just the same???
*February 8, 2011*

**Physics - Please Help**

Two cars are moving. The first car has twice the mass of the second car but only half as much kinetic energy. When both cars increase their speed by 3.41 m/s, they then have the same kinetic energy. a) What is the original speed of the first car? b)What is the original speed ...
*February 8, 2011*

**Physics**

Two cars are moving. The first car has twice the mass of the second car but only half as much kinetic energy. When both cars increase their speed by 3.41 m/s, they then have the same kinetic energy. a) What is the original speed of the first car? b)What is the original speed ...
*February 8, 2011*

**Chemistry**

Calculate the amount of Citric acid monohydrate needed to make 100 mL of 0.1 M solution
*February 7, 2011*

**physics**

a worker drives a .551 kg spike into a rail tie with a 2.55 kg sledgehammer. The hammer hits the spke with a speed of 62.1 m/s. if one fourth of the hammers kinetic energy is converted to the internal energy of the hammer and soike, how much does the total internal energy ...
*February 7, 2011*

**chemistry**

How many photons of light are emitted when the electrons in 10 hydrogen atoms drop from energy level 5 to 3?
*February 5, 2011*

**SraJMcGin**

Thanks so much SraJMcGin for all those notes, even my teacher didnt provide us with such good notes like you did:) Thanks so much:)<3<3<3<3<3<3<3 Where do I check the related questions?
*February 3, 2011*

**SraJMcGin**

SraJMcGin. I have a few questions; a few things that I don't really get.. I have trouble remembering the endings of the er, ir, and re verbs. Regular verbs mean that they don't have to be changed(they stay in the same form), its just their endings that change, the ...
*February 3, 2011*

**physics**

One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching this first snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the first. The acceleration of gravity is 9.8 m/...
*February 3, 2011*

**French**

use 2 verbs together with the second in the infinite form. I dont get this...what to do?
*February 2, 2011*

**French**

Ask a question using Qui, Qui a la, Quelle, Quand, etc. 1.Quand tu vas a la cafe? 2.Qui vas aller a lècole? 3.Quelle heure est-il? Have I got all of them?
*February 2, 2011*

**French**

Use different adjectives correctly and demonstrate understanding of gender and number changes -2 BANGS examples/2 Non-Bangs examples. B-Beauty(Belle, Beau) A-Age(Jeune, Vieux) N-Number(Nouveau, Nouvelle) G-Gender(Bon, Mauvais) S-Size(Petit, Grande) Im not really sure of what ...
*February 2, 2011*

**French**

Wow thanks Grace so much:)
*February 2, 2011*

**French**

Difference between indefinite and definite articles? Indefinite = Un, Une, Des Defenite = La, Le, Les The indefinite articles means A or A(n) and Des means some. Le, and La mean the, and Les is the plural form of these two. Give example of each: 1.Je vais manger des fromage.(...
*February 2, 2011*

**Statistics**

Juan makes a measurement in a chemistry laboratory and records the result in his lab report. The standard deviation of students' lab measurements is 10 milligrams. Juan repeats the measurement 3 times and records the mean (x-bar) of his 3 measurements. a) What is the ...
*February 1, 2011*

**math**

ragan takes an hour to plant 2 vines between each of the 6 posts in the first row of his vineyard how long will it take to plant two vines between each of the 9 posts in the longer second row hint 10 vines take one hour
*February 1, 2011*

**math**

i have 3 kg 4 kg and 5 kg on one side and 5 kg and 7 kg on the other side which two tiles do i swap to have the same amount on both sides
*February 1, 2011*

**math**

i have 3 kg 4 kg and 5 kg on one side and 5 kg and 7 kg on the other side which two tiles do i swap to have the same amount on both sides
*February 1, 2011*

**math**

how do you add 3 1/2 + 1 3/4
*January 31, 2011*

**Physics**

The air speed indicator of a plane that took off from Detroit reads 373 km/h and the compass indicates that it is heading due east to Boston. A steady wind is blowing due north at 42.3 km/h. Calculate the speed of the plane with reference to the ground. If the pilot wishes to ...
*January 30, 2011*

**Physics**

For a science fair competition, a group of High School students built a kicker-machine that can launch a golf ball from the origin with a velocity of 12.3 m/s and initial angle of 29.9° with respect to the horizontal. *Where will the golf ball fall back to the ground? *How...
*January 30, 2011*

**Physics**

A golf ball is hit with an initial angle of 54.7o with respect to the horizontal and an initial velocity of 85.1 mph. It lands a distance of 104.3 m away from where it was hit. By how much did the effects of wind resistance, spin, and so forth reduce the range of the golf ball...
*January 30, 2011*

**math**

hey, this is my first time using this site so I'm not sure what I'm doing exactly! So i need a REALLY simple way how to convert fractions into a percent! i be confused!! :(
*January 27, 2011*

**Photography**

Suppose you have three negatives: an over-exposed one, an under exposed one, and a correctly exposed one. Which would require the longest exposure during contact printing?
*January 27, 2011*

**Geometry**

Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric circles are each 1.25 m long. Find the total length of wrought iron used to make the structure. Round the answer to the nearest meter. Show your work.
*January 26, 2011*

**Math**

Lois invests $650 every 6 months at 4.6%/a compounded semi-annually for 25 years. How much interest will she earn after the 25th year?
*January 26, 2011*

**Math**

I did it, im just making sure my answer is right
*January 26, 2011*

**Math**

On July 1, 1996, Anna invested $2000 in an account that earned 6%/a compounded monthly. On July 1, 2001, she moved the total amount to a new account that paid 8%/a compounded quarterly. Determine the balance in her new account on January 1, 2008.
*January 26, 2011*

**math**

On July 1, 1996, Anna invested $2000 in an account that earned 6%/a compounded monthly. On July 1, 2001, she moved the total amount to a new account that paid 8%/a compounded quarterly. Determine the balance in her new account on January 1, 2008.
*January 26, 2011*

**Math**

Cliff has some money he wants to invest for his retirement. He is offered two options: 10%/a simple interest or 5%/a compounded annually. Under what conditions should he choose the first option
*January 26, 2011*

**Math**

Q: Determine the sum of the first seven terms of a geometric series in which the first term is 11 and the seventh term is 704. ^Are there two answers, since the common ratio could be positive or negative?
*January 25, 2011*

**math**

in 5 years art will be twice as old as ben. 5 years ago art was 3 times as old as ben. How old are they?
*January 24, 2011*

**Math**

The revenue for a business is modeled by the function R(x)=-2.8(x-10)^2+15, where x is the number of items sold, in thousands, and R(x) is the revenue in thousands of dollars. Express the number sold in terms of the revenue.
*January 22, 2011*

**Math**

Determine the domain and range of f(x)=-sqrt(x+3) and the equation of the inverse.
*January 22, 2011*

**Math**

Simplfy 7sqrt(3/6)
*January 22, 2011*

**Pre Calc**

A swimming pool can be filled by a vent in 10 hours. When the pool is filled, it can be emptied bya drain pipe in 20 hours. The pool manager mistakenly leaves the drain pipe open while trying tofill the pool. How long will it take to fill the pool?
*January 21, 2011*

**physics**

Find the coefficient of kinetic friction between a 4.3-kg block and the horizontal surface on which it rests if an 80 Newton/meter spring must be stretched by 2.7 cm to pull the block with constant speed. Assume the spring pulls in a direction 13 degree above the horizontal.
*January 19, 2011*

**Math**

40 + 24 = 64
*January 19, 2011*

**physics**

thank you! may God bless you Bob :)
*January 19, 2011*

**physics**

My bad. Find the coefficient of kinetic friction between a 4.3-kg block and the horizontal surface on which it rests if an 80 N/m spring must be stretched by 2.7 cm to pull the block with constant speed. Assume the spring pulls in a direction 13 degree above the horizontal.
*January 19, 2011*

**physics**

Find the coefficient of kinetic friction between a 4.3- block and the horizontal surface on which it rests if an 80 spring must be stretched by 2.7 to pull the block with constant speed. Assume the spring pulls in a direction 13 above the horizontal.
*January 19, 2011*

**Algebra 2**

Complete the square to solve -x^2-7x+6=-2x^2
*January 17, 2011*

**MATH**

Solve for y in the following system of equations: x - y = -1 3x + 5y = 21
*January 13, 2011*

**Math**

if log(x+1) 27=3 find the value of x *(x+1) is the base i know that the answer is 2 but i have no clue how to get that
*January 13, 2011*

**Statistics**

"Buy a Match 6 lottery ticket every day until you win the lottery. (In a Match 6 lottery, a player chooses 6 different numbers from the set {1, 2, 3, ..., 44}. A lottery representative draws 6 different numbers from this set. To win, the player must match all 6 numbers, ...
*January 13, 2011*

**science**

when do plates have the most potential energy
*January 11, 2011*

**Math**

The height of the tide in a given location on a given day is modelled using the sinusoidal function h(t)=5 sin (30(t-5))+7. a) What time is high tide? What time is low tide?
*January 10, 2011*

**Life Span Development**

Someone tells you that she has analyzed your genetic background and environmental experiences and concluded that environment definitely has had little influence on your intelligence. What would you say about this analysis?
*January 9, 2011*

**math**

A grocer get food from three suppliers. They deliver every 5 days, 6 days, and 7 days, respectively. All three came today. When will they all deliver on the same day again?
*January 6, 2011*

**social studies**

why does the 21st century include 2011
*January 5, 2011*

**marketing**

Imagine that you are a mentor to a new employee at a marketing firm. The new employee is having trouble understanding what the term market communication really means.
*January 3, 2011*

**english**

Verbs that form their past and past participle by adding ed , d , or t to the present are called a) regular. b) irregular
*January 3, 2011*

**English**

Read the following sentence. Decide if the verb is used as transitive or intransitive. The sun rose over the mountain. 1)transitive 2)intransitive
*January 3, 2011*

**Statistics**

Ohhh I get it now! Thanks so much!
*January 2, 2011*

**Statistics**

A coin is tossed five times. Find the probability of getting four tails. I realize that getting four tails is the exact same thing as getting only one heads, but how would you figure out this problem using probability rules? Thanks for your time, I appreciate it :]
*January 2, 2011*

**math**

hi i made a typo in my last question can u please show me step by step how to simplify [(x^3/y^3) -1]/[(x^2/y^2)+(x/y)+1]
*January 2, 2011*

**math**

[(x^3/y^3) -1]/[(x^2/y^2)+(x/y)+1] is right yes please help
*January 1, 2011*

**math**

how do i simplify [(x^3/y^3) -1]/[(x^2+y^2)+(x/y)+1]
*January 1, 2011*

**Math**

The point (-8,3) lies on the terminal arm of angle theta in standard position. Determine the primary trigonometric ratios for angle theta and calculate the value of theta to the nearest degree. Only the sine ratio was positive, and when I used that to calculate the angle, it ...
*December 27, 2010*

**Math**

State the restrictions on the variables for these trigonometric identities. a)(1 + 2 sin x cos x)/ (sin x + cos x) = sin x + cos x b) sin x /(1+ cos x) = csc x - cot x
*December 22, 2010*

**math**

im helping my brother with his homework but i completely forgot how to do this? Solve the system by substitution: y=3x-4 x+5y=-4
*December 21, 2010*

**General Chemistry**

According to the following reaction, how many moles of Fe(OH)2 CAN FORM FROM 175.0 mL of 0.227 M LiOH soultion? Assume that there is an excess of FeCl2 FeCl2(aq)+ 2 LiOH(aq)-(Oh)2(s)+2LiCl(aq) I have no clue how to approach this problem? Could anyone help me? I do not know ...
*December 17, 2010*

**Math**

Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually Under what conditions should he choose the first option?
*December 15, 2010*

**Math**

Under what conditions should he choose the first option? Explain.
*December 15, 2010*

**Math**

Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually
*December 15, 2010*

**Physics**

How does the index of refraction relate to the speed of light in a substance?
*December 14, 2010*

**Physics **

When an object is immersed in a fluid describe the buoyant force?
*December 14, 2010*

**Physics**

A 1.5kg frog on a string is being dragged along a table with a force of 12N. If string makes a 60 degree angle with the table, and the co efficent for friction is 0.15, what is the accleration of the frog.
*December 14, 2010*

**chemistry**

The boiling point of an aqueous solution is elevated by 0.15 degrees celcius. the change in freezing point of the solution, delta T, is? a.) -6.32 b.) 0.15 c.) -0.15 d.) 0.54 e.) -0.54 I know the answer is d, i just don't understand how to get it! thanks!
*December 14, 2010*

**calculus**

D. Plugging 2 into original fxn gives you y-coordinate. (2,6) Taking the derivative of y=(x^3)-x gives you f'(x)=3x^2-1. Plug in x=2 to find slope. use point slope form to get equation! :)
*December 14, 2010*

**Math**

sin^2 theta + 2 cos theta -1/ (sin^2 theta +3 cos theta-3= cos^2 theta+cos theta/ (-sin^2 theta) Prove the identity.
*December 12, 2010*

**chemistry**

Formula for specific heat:q/(m * delta t) Input given data: 35.2 J/(4.0 g * 20 c) Solve: 0.44 J/(g*c)
*December 12, 2010*

**Biology-Respiratory System**

What's the difference between capillaries, pulmonary artery and pulmonary vein?
*December 11, 2010*

**Math**

Prove this identity. State any restrictions on the variables. sin x/(tan x)= cos x
*December 9, 2010*

**Physics**

A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation ...
*December 9, 2010*

**Physics**

A satellite has a mass of 101 kg and is located at 1.99x10^6 m above Earth's surface. (a) What is the potential energy of the satellite at this location? (b) What is the magnitude of the gravitational force on the satellite? for potential energy, I was using the equation ...
*December 9, 2010*

**Math**

Determine whether each general term defines a geometric sequence. Explain. a) f(n)= 2/(3n+1) b) f(n)= 11/(13^n)
*December 7, 2010*

**2nd grade math**

measure the perimeter to the nearest 1/2cm.
*December 7, 2010*

**statistics**

An Urn contains 7 red and 3 white balls. Two balls are drawn in succession without replacement. If the second ball is white, what is the probability that the first ball was white?
*December 7, 2010*

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