Friday

July 31, 2015

July 31, 2015

Total # Posts: 6,757

**First year chem**

Barium has 6 stable isotops (132Ba, 134Ba, 135Ba, 136Ba, 137Ba, and 138Ba) with natural abundances ranging from 0.1% for least abundant to 71.7% for the most abundant. Which isotope of barium is the most abundant? (Answer is 138Ba) Thank you for your help!!
*November 9, 2013*

**PRE-CALC HELP **

1) Two boats leave the same port at the same time. One travels at a speed of 27 mi/h in the direction N 50° E and the other travels at a speed of 22 mi/h in a direction S 70° E (see the figure). How far apart are the two boats after one hour? (Round your answer to the ...
*November 8, 2013*

**PRE-CALC HELP **

Two boats leave the same port at the same time. One travels at a speed of 31 mi/h in the direction N 50° E and the other travels at a speed of 20 mi/h in a direction S 70° E (see the figure). How far apart are the two boats after one hour? (Round your answer to the ...
*November 8, 2013*

**PRE-CALC HELP **

A communications tower is located at the top of a steep hill, as shown. The angle of inclination of the hill is 58°. A guy wire is to be attached to the top of the tower and to the ground, 150 m downhill from the base of the tower. The angle α in the figure is ...
*November 8, 2013*

**physics**

Water is flowing down through the pipe shown in the drawing. Point A is 0.410 m higher than B. The speed of the water at A and B are vA = 5.00 m/s and vB = 3.80 m/s. Determine the difference PB - PA in pressures between B and A. The density of water is 1.00x10^3 kg/m3.
*November 7, 2013*

**geography**

What are some reasons why society, especially in the U.S., has been more and more accepting of the view of global warming? Please post to these questions by the end of Week 3.
*November 6, 2013*

**chemistry**

Assuming reaction goes to completion, determine the final concentration of NH4Cl in the calorimeter. heat capacity =3.03J/g.c density =1.012 5g of NH4Cl used 100 mL of water used NH4Cl(s) + H2O(l) --> NH4Cl(aq)
*November 6, 2013*

**math**

HOw can i explain this to a 4th grade student as it seems her teacher did not do the number substitution like W and dividing to get the answer.
*November 5, 2013*

**math**

the girls high school basketball team played 12 games. they won 6 more games than they lost. find the number of games the basketball team won.
*November 5, 2013*

**ashford**

Mrs. Orlof teaches two history classes, one in the morning and one in the afternoon. Yesterday she gave the same test to both classes. Anyone who failed the test must take a retest. Since a greater percentage of students who took the morning test failed the test than students ...
*November 4, 2013*

**Algebra**

-2 |h-7|= -28
*November 3, 2013*

**chemistry**

Compared to the particles of a gas, the particles of a liquid are not in constant motion collide with the sides of the container, but not with each other do not completely fill their container can move longer distances have more space in between the molecules
*November 2, 2013*

**Physics**

MASS PUSHED BY A SPRING A block of mass m=2 kg on a horizontal surface is connected to a spring connected to a wall (see figure). The spring has a spring constant k= 16 N/m. The static friction coefficient between the block and the surface is μs= 0.7 , and the kinetic ...
*November 2, 2013*

**World History**

d
*November 1, 2013*

**math**

A small wheel of radius r is situated at the top of a ramp having an angle Î¸ = Ï€/3 rad At t = 0 the wheel is at rest and then it starts to rotate clockwise in the positive x direction with constant angular velocity Ï‰. Find the parametric ...
*October 31, 2013*

**informal logic**

Which of the following may not qualify as a falsifiable claim? (Points : 1) Your luck will improve. Your house will be sold tomorrow. Granite is more dense than sand. Smoking may cause heart disease.
*October 30, 2013*

**Algebra**

a car repair shop charge $80 per hour for labor and $210 for the parts of a car . if the total cost of repair for the car was $490 , how many hours did it take ro repair the car ?
*October 28, 2013*

**Probability**

7. The random variable X is distributed normally with a mean of 12.46 and variance of 13.11. You collect a random sample of size 37. a. What is the probability that your sample mean is between 12 and 13? b. What is the probability that a single observation is between 12 and 13...
*October 27, 2013*

**chemistry**

Based on the calculations above, which of the following equations is the one represented by this experiment? Justify your answer by comparing the moles of iron consumed and the moles of copper produced to the coefficients in the equation of your choice. (16 points) Fe + CuCl2...
*October 26, 2013*

**Social studies**

"There capitols"? Really? You're a teacher? How about "their capitols"? And your map left off the capitol of Mississippi altogether.
*October 24, 2013*

**physics**

A person jumps from the roof of a house 4.0-m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.66m. If the mass of his torso (excluding legs) is 42kg , what is the magnitude of the average force exerted ...
*October 24, 2013*

**Science**

I have too much swaggg
*October 23, 2013*

**Physics**

A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 22◦ below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration ...
*October 23, 2013*

**physics**

A place kicker must kick a football from a point 34.0 m (about 37 yd) from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 21.0 m/s at an angle of 56◦ to the horizontal. To...
*October 23, 2013*

**Math- URGENT**

find the value of x or y so that the line through the points has the given slope. (12,y) and (15,-8); slope: 2/3
*October 23, 2013*

**Chemistry**

Is a more negative corrosion potential more susceptible to corrosion or a less negative corrosion potential?
*October 23, 2013*

**science**

What keeps the very dense gas at the core of the Sun from becoming a solid?
*October 23, 2013*

**English ---- check grammar---**

I know that looks like a long paragraph . I wrote it like a essay , but when i post it , it changed all my style and space !!! I dont know why !
*October 23, 2013*

**English ---- check grammar---**

Can you guys check grammar for me ? Thank you!
*October 23, 2013*

**English ---- check grammar---**

When I was fifteen years old, I left the Vietnam to begin a new life with my family in the United States. But my young heart has never stopped yearning for that one day when I would go back home. One peculiar thing about Vietnamese is that they associate homesickness with ...
*October 23, 2013*

**5TH GRADE MATH**

50*2 = 100 100/3 = 33 1/3
*October 22, 2013*

**5TH GRADE MATH**

Um...Stephon could you stop typing in caps?
*October 22, 2013*

**5TH GRADE MATH**

basically we need to find the greatest whole number to be given out to each student. so, 3 to each student means 3 + 3 +3 or 3* 3 = 9. There are 10 pencils, so 10-9 = 1 remaining pencil.
*October 22, 2013*

**milli**

What's the question, my good man?
*October 22, 2013*

**Trigonometry**

Yes sir, this is supposed to be a precalculus problem. Thanks
*October 22, 2013*

**Trigonometry**

Find all x such that 0< = x <= pi/2 and sin^7 x + cos^7 x = 1. (Be sure to show that no other values of x satisfy the equation. Remember, x is in radians.) I'm confused. I posted this before but my thick skull couldn't absorb the answer I was given. Could someone...
*October 22, 2013*

**Please help mrs Sue**

I'm pretty sure it's A.
*October 22, 2013*

**Biology**

Which of the following cells check for during the G2 check point? a. Growth hormone c. DNA integrity b. Nutritional status d. Cell size In mitosis, if a cell has 4 chromosomes in prophase, how many chromosomes will this cell have in metaphase? a. 64 b. 32 c. 16 d. 8 e. 4 The X...
*October 20, 2013*

**Trigonometry - Slopes stuff**

Point A is the terminal point of angle phi and point B is the terminal point of angle theta. Point A is in the first quadrant and point B is in the second quadrant, while tan phi = 1 and tan theta = -7. Find the slope of AB. Ok so since A is in the first quadrant and tan phi...
*October 18, 2013*

**Math**

You are making a recipe that consists of 5 different ingredients. In how many different orders can you add the ingredients to the bowl?
*October 18, 2013*

**quantum physics**

Well, technically, they could cheat via email so it's not exactly a better way per se, however, yes that is cheating I suppose.
*October 18, 2013*

**math**

What would be your answer after all these problems?
*October 17, 2013*

**Statistics**

In probability and statistics, mean is used to refer to one measure of the central tendency either of a probability distribution or of the random variable characterized by that distribution. In statistics and probability theory, the standard deviation (represented by the Greek...
*October 17, 2013*

**math**

Yerp
*October 17, 2013*

**math**

Whoops, I meant 100/100 - 21/100 = 79/100 100/100 + 6/100 = 106/100 79/100 * 106/100 * 44 = ?
*October 17, 2013*

**math**

Do what you did on the previous problems :P 100/100 - 21/100 = 79/100 100/100 - 6/100 = 94/100 79/100 * 94/100 * 44 = ?
*October 17, 2013*

**Math**

Actually, that would be 1.23 x 10^-10. Move it over one more place. Count 11 places from 1.23. From 1.23 to 0.123 there is one jump.
*October 17, 2013*

**Math**

This means: how many times larger is a proton then an electron? Thus we put the proton on the numerator and the electron on the denominator. From pure chemical science, a proton is wayyy bigger (and heavier) than an electron. Thus, if you get an answer that is really small ...
*October 17, 2013*

**math**

Oh right, I'm sorry.
*October 17, 2013*

**math**

We need a 17% discount. We need a 5% discount as well. These discounts are on something valued at $89. If you have a 17% discount, it means you get 100/100 - 17/100 = 83/100 off the original price. In the same way, if you have a 5% discount, it means you have a 100/100 - 5/100...
*October 17, 2013*

**Physics**

What do you say?
*October 17, 2013*

**Science**

Similar results should be obtained when the experiment is repeated. Don't spam your posts repeatedly if possible, ok?
*October 17, 2013*

**Science**

Similar results should be obtained when the experiment is repeated.
*October 17, 2013*

**Health**

What she means is that how did your family affect your behavior? How did the internet affect your behavior? Or so I interpret. Etc. etc.
*October 17, 2013*

**math**

Ok, 5% = 5/100. Thus, 5% tax is equal to 0.05. The tax is equal to 0.05 * (the before tax cost = 40). Then, you add the price of the ticket back. You can take a shortcut by doing 100% + 5% = 105% * 40 = 1.05 * 40 = ?
*October 17, 2013*

**math**

Ms. Sue is totally correct. If you want to go a little bit simpler then: 25% off something is equal to 75/100 * (the price of the "something") because 25% = 25/100. But 25% means that you take that much off, so you need to minus 25/100 from the original percentage, ...
*October 17, 2013*

**Science**

Honestly, a google search will probably help you... but.... Chemical Composition Core is made of iron with minor amounts of nickel, and lies at the center of the earth Mantle is made of iron-magnesium silicates and surrounds the core. The mantle makes up the bulk of the earth...
*October 17, 2013*

**MATH**

Ummmmmmmm how am I supposed to know why don't you ask him ;) ? Just kidding, there is usually like 12 people on a bsaketball team and like 6 on a tennis team so probably he's not correct.
*October 17, 2013*

**Can someone check these answer for me?**

np :P
*October 17, 2013*

**Can someone check these answer for me?**

Question 5 is confusing...
*October 17, 2013*

**Can someone check these answer for me?**

Gymnosperms are a taxonomic class that includes plants whose seeds are not enclosed in an ovule (like a pine cone). Gymnosperm means as "naked seed". This group is often referred to as softwoods. Gymnosperms usually have needles that stay green throughout the year. ...
*October 17, 2013*

**Can someone check these answer for me?**

1,2,3 are wrong 4 is correct
*October 17, 2013*

**Can someone check these answer for me?**

Erm.... could you tell me what you think I am not going to just give you the answer to you.
*October 17, 2013*

**Can someone check these answer for me?**

Of course you know you could just do some research on the web and double check your answer by asking it here...
*October 17, 2013*

**Can someone check these answer for me?**

Number 1, a stamen is the male part producing pollen which animals pick up to deliver to the female part. Number 2, the pistil is the female part which produces seeds, so it needs to get the pollen from the male part Number 3, The 3 other answers don't make sense For ...
*October 17, 2013*

**Can someone check these answer for me?**

Or that's what I researched, Ms. Sue is probably right though.
*October 17, 2013*

**Can someone check these answer for me?**

1A 2D 3B 4C 5B
*October 17, 2013*

**Can someone check these answer for me?**

Um...which are the answers you chose?
*October 17, 2013*

**science plz help right now!!!!**

20 points o.O lol
*October 17, 2013*

**Math**

add em all up and divide by 29 29(1+29) / 2 = 435 435 / 29 =???
*October 17, 2013*

**math**

1/2 * 1/2 * 1/2 = 1/8
*October 17, 2013*

**Science**

Proteins are created by making a long chain of amino acids when ribosomes translate mRNA. In this process, tRNA brings in the single amino acids to the ribosome.
*October 17, 2013*

**Math**

20/x = 4/5 4x = 100 x = 25 Dunno why the info about monday is in there
*October 17, 2013*

**Kinesiology**

What are the ABCs that kinesiologists in sport and exercise psychology study?
*October 17, 2013*

**Trigonometry - find all x**

Thanks a lot for your answer sir!
*October 17, 2013*

**Trigonometry - find all x**

Find all x such that 0 <= x <= pi/2 and sin^7 x + cos^7 x = 1. (Be sure to show that no other values of x satisfy the equation.) Well, I know sin^2 x + cos^2 x = 1, and that kind of looks like sin^7 x + cos^7 x = 1. I'm unsure on how to proceed. Help?
*October 17, 2013*

**Solving inequanities**

9t + 4 - 4 > 32 + 4 9t > 36 9t/9 > 36/9 t > 4
*October 17, 2013*

**Science**

For every trait we have--eye color, skin color and so on--there is a gene or group of genes that controls the trait by producing first the message and then the protein. Sperm cells and eggs cells are specialized to carry DNA in such a way that, at fertilization, a new ...
*October 17, 2013*

**Trigonometry - Proof**

Prove that cot x + tan x = csc x * sec x whenever both sides are defined. I tried rewriting all sides in terms of sin x but it got all complicated and I can't make head or tail of it. Could someone assist me? Is it all just a pound-out algebra problem in essence? How do ...
*October 16, 2013*

**math**

And what, Taylor, would that be? Just a hint, the percent for a tax / room rate is less than 100....so your answer is inaccurate.
*October 16, 2013*

**Math estimating quotients**

You are right. 18* 3 = 54. 17*3 = 51.
*October 16, 2013*

**Science**

and who cares if he is cheating, there is nothing you can do about it so GET OFF HIS ASS!!!
*October 15, 2013*

**Science**

ms. sue, shut up, not cheating, get a life! GOD!!
*October 15, 2013*

**Fat gram calculator**

Design a program that asks the user for the number of fat grams and calories in a food item. Validate the input as follows. Make sure the number of fat grams and calories are not less than 0. According to nutritional formulas, the number of calories cannot exceed fat grams * 9...
*October 13, 2013*

**English**

Using these words animosity, effervescent, solicitude anonymity, nonchalant and nepotism, where would the go in these sentences? Would it be animosity, effervescent, anonymity, solicitude, then nepotism?? A. After losing the to Henery, Gary cited _______ as the reason for his ...
*October 13, 2013*

**Genetics**

The following is pulse-chase experiment was performed as in Okazaki’s experiment, but in an organism as follows (all other as in regular replication): • One linear chromosome • 2 origins of replication spaced 50Kb apart, one firing at t=0 and one in t=10 min. &#...
*October 11, 2013*

**maths**

When a die is thrown,what is the probability that the number is greater than 1,given that it is odd?
*October 10, 2013*

**Physics**

In uniform circular motion, which of the following quantities are constant: speed, instantaneous velocity, tangential velocity, radial acceleration, tangential acceleration? Which of these quantities are zero throughout the motion?
*October 8, 2013*

**earth science**

Hydrogen, it used to be purple.
*October 8, 2013*

**earth science**

The amount of radioactivity halves every so many years, so ifyou know how much should have been it, there is a simple equation to firgure it out.
*October 8, 2013*

**algebra**

Determine the number and type of roots for each equation. thanks inadvance can u please show mw step by step thanks 2X(X+2)=-2
*October 7, 2013*

**algebra**

Determine the number and types of roots for each equation X(X+3)=2
*October 7, 2013*

**chemistry **

Volume (mL) of 2.15 M potassium hydroxide that contains 8.09 g of solute WebAssign will check your answer for the correct number of significant figures. mL
*October 6, 2013*

**Physics**

A tennis player hits a ball 2.0 m above the ground. The ball leaves his racquet with a speed of 15.0m/s at an angle 5.3∘ above the horizontal. The horizontal distance to the net is 7.0 m, and the net is 1.0 m high. How much did it clear the net by?
*October 4, 2013*

**Math**

About 3.41 seconds.
*October 4, 2013*

**Biology of environment poster project**

How about you do your own work and leave this site for people who really need help, Mohammad.
*October 4, 2013*

**Math**

50x10=500
*October 3, 2013*

**maths help plz!**

can anyone tell me how you can find the angle of 6 different side of hexagon.
*October 3, 2013*

**physics **

Find x-component of vector d=(110m , 46 degrees below + x-axis). Find y-component of vector d=(110m ,46 degrees below + x-axis). Find x-component of vector v=(350m/s , 28degrees above + x-axis). Find y-component of vector v=(350 , 28 above + x-axis). Find x-component of vector...
*October 2, 2013*

**chemisry**

When alkali metals are heated with hydrogen they form what
*October 2, 2013*