Wednesday
April 16, 2014

Posts by alex


Total # Posts: 2,498

physics
A 550-g ball traveling at 8.0 m/s undergoes a head-on elastic collision with a 250-g ball traveling toward it also at 8.0 m/s. What is the speed of the 250-g mass after the collision?

Physics HELP!!!
A ball (radius 0.2 m) is rolling on level ground toward an incline. If its velocity is 3 m/s, to what maximum height above the ground does it roll up the incline? The ball is a hollow sphere with a moment of inertia I=(2/3)mr2 (m is the mass of the ball, r its radius).

math
In a standard deck of playing cards there are 13 hearts. If 3 cards are drawn without replacement what's the probibility that all 3 cards will be hearts?

physics
In a game of basketball, a forward makes a bounce pass to the center. The ball is thrown with an initial speed of 3.9 m/s at an angle of 13.8° below the horizontal. It is released 0.65 m above the floor. What horizontal distance does the ball cover before bouncing?

Physics
In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 16 m/s at an angle of 32° above the horizontal. a) How long does it take for the ball to reach the wall if it is 5.2 m away? (b) How high is the ball wh...

geometry
How do I find the length of the segment AB when A(-4,6) and B(3,-5)

chemistry
a copper block has a mass off 80 grames and occupies a volume of 9.5cm3 calculate its density

college algebra
Use the theorem on bounds to establish the best integral bounds for the roots of the equation w^(4)-8w^(3)+2w^(2)+10w-1=0

physics
A cat chases a mouse across a 1.0 m high table. the mouse steps out og the way, and the cat slides off the table and strikes the floor 2.2 m from the edge of the table. When the cat slid off the table, what was it's speed?

chemistry
which of the following must be known precisely for the specific heat to be accurate. Answer a. the mass of the water in the calorimeter b. the temperature of the metal shot before it is immersed in the boiling water c. the mass of the boiling water

chemistry
Metal Specific Heat (J/g-C) Al (s) 0.900 Au(s) 0.129 Cu(s) 0.385 Fe(s) 0.444 Hg(l) 0.139 H2O(l) 4.184 C2H5OH(l) 2.46 Using the above table, determine the final temperature if 713.6J is released from a 48.2g sample of copper initially at 93.8o C. -q = mass Cu x specific heat Cu...

physics
How long does it take for the ball to reach the wall if it is 5.2 m away?

physics
How high is the ball when it hits the wall?

physics
In a game of basketball, a forward makes a bounce pass to the center. The ball is thrown with an initial speed of 3.9 m/s at an angle of 13.8° below the horizontal. It is released 0.65 m above the floor. What horizontal distance does the ball cover before bouncing?

chemistry
o oops hahah thankss for answering my question!

chemistry
thank doctor bob pursley thats right i know who you are.

chemistry
A 100.0 mL portion of 0.250 M calium nitrate solution is mixed with 400.0 mL of .100M nitric acid solution. What is the final concentration of the nitrate ion? BOB PURSLEY PLEASE EXPLAIN MORE THOROUGHLY HOW YOU GOT THE NITRATE ION TO BE .5M

chemistry
where did you get the .5M from? Ca(NO3)2 is .25M

chemistry
A 100.0 mL portion of 0.250 M calium nitrate solution is mixed with 400.0 mL of .100M nitric acid solution. What is the final concentration of the nitrate ion?

Chemistry
I got: 0.4624-(.05016/2) log(.80/.34)= 98.569 and i don't get the second part where you reverse it and add it...do i add it to 98.569??

Chemistry
Calculate the cell potential for a cell based on the reaction Cu(s) + 2Ag+(aq) -> Cu2+(aq) + 2Ag(s) when the concentrations are as follows: [Ag+]= 0.53 M, [Cu2+] = 0.9 M. (The temperature is 25◦C and E0 = 0.4624 V.) Answer in V.

Statistics
A spinner has three outcomes, each half as likely as the one before it. How can I set this up?

Statistics
1. A spinner has four outcomes Three outcomes have the same probability and the fourth is half as likely. 2. A spinner has three outcomes, each half as likely as the one before it.

Math
lim as b approaches infinity of integral of xe^-x^2 from 0 to b aka lim b->inf int(0,b) x*e^(-x^2) dx

MATH
35 degrees 90 - 65 = 35

Inequalities
I'm looking a problem in my textbook and I don't understand how it goes from one step to another. It starts out as: (120 * 2^5)/(180 * n^4) < 1/10^4 That turns into: n^4 > (64 * 10^4)/3 Can you please explain the steps between those two? Thanks

Math
7000/100,000 = x/100 Cancel out three zeroes to get 7/100

physics
How did you figure this problem out? How did you work it out?

8th grade earth science
how to find the longitude of meridians

chemistry
when 4.00 times 10 to the fifth kg of H2 is added to an excess of N2, 1.04 times ten to the sixth kg of NH3 is produced. what is the percentage yield of th ereaction?

5th grade
how to keep a watershed heathly?

physics
YOU SHOULD KNOW

Pre Calc
If f(x) = 2x − 1 and g(x) = x^2 + 5, find (f of g)(−3) and (g of f)(2). Can anyone help ?

marketing
I would advise a company to go the quantitative route because they would have more accurate information and also could figure out a way to profit. You would want to make the package look bright and stand out but then i would think it would be qualalitive.

marketing
Quantitative researh would be best because it deals with numbers. But i am not quit sure what the question is asking:(

marketing
I went there but i feel like it would be both because with out one you would not be able to have the other

marketing
A manufacturer of a new product for whitening teeth would like to investigate the effects of package design and label information on consumer’s perceptions of the product and their intentions to buy it. Would you advise the manufacturer to use qualitative or quantitative ...

physics
A golfer imparts a speed of 32.1 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...

Chemistry
Balance? Cr2O7^2- + C2H4O yields C2H4O2 + Cr^3+ (When I say ^ a number followed by a plus or minus that's the charge) Half-reaction method needed.

Chemistry
0.274g H

6th grade
PEMDAS Parentheses - Divide 24 by 8 get 3. Exponents - 3 squared is 9. Multiplication - None. Division - It was in the parentheses. Addition - None. Subtraction - 8-9.

Caring for school age childres
B.family

Social Studies
Discovering America.

AP Chemistry
I can't get EXACTLY 68 grams of water; dunno how to change equation without using a fraction.

AP Chemistry
Summary of problem Photosynthesis uses CO2 & H20 to make C6H12O2. If a plant has 99 grams of CO2 & 68 grams of H2O for photosynthesis, what's the balanced equation, the mass of glucose made, & the mass of excess?

1st grade
Subtraction. 100 but take out 1. 100 minus 1. 100 - 1. 99.

Science
OK, I suck at this, but I know that if the TOTAL moles of the formula is 2... you can't have 16 as one part. 2 < 16. Find the molar mass of the formula, find the percentage of oxygen, divide by 100, multiply by the total molar mass, & (if there's 2 moles) multiply b...

math
No.

Physics
A billiard ball of mass m = 0.250 kg hits the cushion of a billiard table at an angle of θ1 = 63.4° at a speed of v1 = 24.8 m/s. It bounces off at an angle of θ2 = 71.0° and a speed of v2 = 10.0 m/s. (a) What is the magnitude of the change in momentum of the ...

Math
The materials for each feeder cost $6, and they sell an average of 20 per week at a price of $10 each. They conduct a survey and find that for every dollar increase they lose 2 sales per week. Find a function that models weekly profit in terms of price per feeder

PHYSICS
A skier is gliding along at on horizontal, frictionless snow. He suddenly starts down a incline. His speed at the bottom is . What is the length of the incline? How long does it take him to reach the bottom?

physics
A skier is gliding along at on horizontal, frictionless snow. He suddenly starts down a incline. His speed at the bottom is . What is the length of the incline? How long does it take him to reach the bottom?

6th grade
I NEED EXAMPLES OF ARCHIPELAGO

math
ohh ohh i get it i get it now . Yea we did it right.

math
Hmm . but wait. we got 3 ? So the fewest number of flips needed to make the change is 3 ? I dont understand what the answer 3 is .

math
I got 3 . lol hbu ?

math
Yea i know i dont get this either !!

algebra)
how do i identify the property shown in a number sentence..ex. 5x(2x4)=(5x2)x4

physics another one
A laser emitting light of wavelength 580 nm is incident on a diffraction grating. What is the maximum number of lines per centimeter for which the m=5 principal maximum will be visible

Physics help I am stuck
Monochromatic light strikes a diffraction grating at normal incidence before illuminating a screen 1.81 m away. If the first-order maxima are separated by 1.40 m on the screen, what is the distance between the two second-order maxima?

chemistry
thanks anna. i figured it out thanx 2 u.

Math
add, simplify if possible. z+r/zr^2 + 8z+r/z^2r

Math
Find all numbers for which the rational expression is undefined. m^3-8m / m^2-25

Math
Find the LCM of this 6a^4c^9, 3a^3c^7, 14a^8c^7

Math
correction: 6a^4c^9, 3a^c^7,14a^8c^9

Math
Find the LCM of this 6^4c^9, 3a^3c^7, 14a^8c^7

3rd grade
i would say c.

Math
ok if i do this that is correct 2w-4/2w = 2(w-2)/2w = w-2/w

Math
Simplify by removing factors of 1 2w-4/2w

English
oranises is supposed to be "organizes" thought u should know.

math
it took 3 hours for patrol boat to travel 48km upstream and 2 hours to travel downstream. What is the current and boat speed.

algebra
In my text book because these are practice questions it says in the question that we assume the denominator is not equal to zero

algebra
Please help on this: ^ means exponent Simplify 48y^6z^0 ___________ -8y^6 z^2

algebra
Oh yes I forgot to add the choices are... z or -z or z over z-1 or z over z+1

Physics
delta x 1 = delta x 2 / (1/sqrt(1-v^2/c^2)) would this be the correct equation to use?

Physics
A Borg cube starship is zooming past Earth with a speed v=0.97c as shown. The cube has side lengths of 3.03 km. What is its volume, measured from Earth? Can someone step me through this problem?

Physics
Have you ever wondered what to do with your unused pet while on vacation? Do you feel bad about just dumping it in some airport pet kennel and showing up again four weeks later? Do you ever wonder how to keep your pet fresh longer instead of having it age uselessly? This is wh...

College Physics
Have you ever wondered what to do with your unused pet while on vacation? Do you feel bad about just dumping it in some airport pet kennel and showing up again four weeks later? Do you ever wonder how to keep your pet fresh longer instead of having it age uselessly? This is w...

Math, Please help :/
wait but up to what number do i have to keep multiplying , like 30+.85* 2,3,4,5,6,7,8,9 - up to what number ??

Math, Please help :/
A list? but what has to go in the list?

Math, Please help :/
Okay . We should of coppied off the board when he had it today.. But whats the real answer ? 36 ?? Or 13??

Math, Please help :/
I know right. Um who do you know that would know the chart ?

Math, Please help :/
Hmm, well yesterday when i was on here someone told me that the answer was - $30 / $.85 = 35.3 or 36 videos. and i think thats right.. But idk . didnt he say we needed a chart ?

Math, Please help :/
Hmm that sounds right , But mr fuchs said that the equation was y=30 * 2.25x , So i dont know , This is confusin :/

Math, Please help :/
What are your formulas?

Math, Please help :/
I dont understand your answer, please explain more.

Math, Please help :/
At Mr.Vid's Video Rentals you can join his VId Club for a monthly membership fee pf $30. Club members pay only $.85 to rent each movie. If you are not a member of the VID club, the movies rent for $2.25 each.How many videos would you have to rent each month to make a membe...

Math
At Mr.Vid's Rentals you can join his VID Club for a monthly membership fee of $30.Club members pay only $.85 to rent each movie. If you are not a member of the VID Club, the movies rent for $2.25 each.How many videos would you have to rent each month to make a membership w...

Algebra
Express the following in simplest radical form. All variables represent positive real numbers. square root of 80a^2b divided by the square root of7a^3b^7 I got an answer of 4 square root of 5 divided by b^3 square root of 7a

us history
i agree

Chemistry (again)
What mass of NaOH is required to precipitate all the Fe2+ ions from 52.0 mL of 0.200 M Fe(NO3)2 solution?

Chemistry
Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form 550 mL of solution. While we're at it... How many milliliters of 10.6 M HCl solution are needed to obtain 0.205 mol of HCl? Also... How many grams of solute are present in 50....

math
It isn't, LOL.

math
E = Elm, M = Maple, O = Oak M = 2E O = 5E O + M + E = 32 Now you just guess & check. Try using the number 8 somewhere; I'm not going to do ALL of it.

9th grade MATH
14 + 2y = 78 78 - 14 = 64 2y = 64 64 / 2 = 32 y = 32

8th grade
the study of the physical and natural world and phenomena, especially by using systematic observation and experiment

GEOMETRY
Not enough info. Sorry.

College Physics
i got 4.11 and it was wrong, also im not sure what units to use.

Algebra
Add and subtract the rational expressions as indicated. Be sure to express your answer in simplest form ((9)/(7x)) + ((1)/(2y)) -1 I got an aswer of (16y)/(7x+2y+1)) but when I submit it shows me as wrong. Can anyone help, thanks

Chemistry
Please help I am 11 and lost.y question is a piece of tungsten has a volume of 5.2cubic centimeters and and mass of 100 grams. What is the density of tungsten? I am in sped class don't understand how to solve it.

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