Thursday
July 31, 2014

Posts by alex


Total # Posts: 2,548

Physics
A toddler is on a playground swing. When she is all the way on the right, then ... her tangential acceleration is maximal to the right. her kinetic energy is maximal. her tangential acceleration is maximal to the left. her tangential acceleration is zero. her velocity is maxim...

Reimbursement Methodologies
Jessica, I am aslo doing my exam but I am really having problems with number 4 in part B exam # 40976200 was wondering if you can help. Thanks

Physics
Why does tension in a rope increase as the rotational speed of a ball increases?

US History
I'm doing a song about Italian Immigration from the 1800's for a project nd I'm kind of stuck. Can someone help me out? What I have is this: Hey fratello, wish me luck Hey sorella, I’m awestruck Hey there Nonno, I’m earning bucks In the land of bountiful ...

Mathematics
the probability of the home team's winning a basketball game is 80% describe a simulation of the probability the home team will win three homes games in a row

math
There's a circle with that has a dot in the middle with two line going to the left and right that's is 16 m. I have to find the area of the circle. I have to give that exact area and an approximate area to the nearest square unit. Help?

math
Is the exact area of a circle with an 16 m radius 32 m squared? And what would be the approximate area be?

Math
I need an algrbra expression

Science
When served at 200 km/h (124 mph), what is the equivalent weight exerted on the tennis ball?

physics
In the figure below, two point particles are fixed on an x axis separated by a distance d. Particle A has mass mA and particle B has mass 4.00mA. A third particle C, of mass 96.0mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at what x coo...

Physics
I do not know. I am having a hard time finding how to do this.

math
rachel is ranked 72 out of 451 students. whats her class rank percentile?

Math- Precalc
could someone please help me solve this problem... e^x - 12e^(-x) - 1

Chemistry
What is a enantiomer?

Chemistry!
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to h...

More chemistry
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to h...

AP chemistry
For the following electronic transitions in the hydrogen atom, calculate the energy, frequency, and wavelength of the associated radiation. From n = 3 to n = 6. From n = 9 to n = 3. From n = 7 to n = 4.

Physics
If it goes under standard level. Exe; sea level is 0 feet. Anything under the sea is x feet below 0.

algebra
two nombers have a sum of 15. one of the numbers is x. Find an expression for the other number

chem
AgNO3 + NaCl produces AgCl + NaNo3 how much AgCl is produced when 3.10g of AgNO3 and .600g of NaCl react?

Calculus
a police helicopter is flying at 200 km/hr at a constant altitude of 1 km above a straight road. The pilot uses radar to determine that an oncoming car is at a distance of exactly 2 km from the helicopter, and that this distance is decreasing at 250 km/hr. Find the speed of th...

Calculus
Solve & plot a graph for the following: F(X)=cos(X)-cos to second power X for the interval negative pi greater than or equal to X less than or equal to positive pi

Calc
Let F be the function defined by F(X)=12X to the 2/3 power minus 4X Find the intervals of which F is increasing? Find X & Y coordinates of all relative max. pts? Find X and Y Coordinates of all relative min pts? Find the intervals of which F is concave down? Sketch a graph of F

12th grade
Solve & plot a graph for the following: F(X)=cos(X)-cos to second power X for the interval negative pi greater than or equal to X less than or equal to positive pi

chemistry
Is the ritalin molecule a polymer?

math
The distance from B to D is approximately (x+10) feet, and the distance from A to C is approcimately (2x-5.3) feet. what is the approximate distance from A to C?

math
MNPQ is a rhombus. The measure of angle MRQ is (13t-1) degrees, and the measure of angle PQR is (7t+4) degrees. what is the measure of angle PQM?

math
The scissor lift forms rhombus PQRS with PQ= (7b-5) meters and QR= (2b-0.5) meters. IF S is the midpoint of Line RT, what is the length of line RT

math
A square graphed on the coordinate plane has a diagonal with endpoints E (2,3) and F (0,-3) what are the coordinates of the endpoints of the other diagonal?

Geometry
A square graphed on the coordinate plane has a diagonal with endpoints E (2,3) and F (0,-3) what are the coordinates of the endpoints of the other diagonal?

Geomtry
The scissor lift forms rhombus PQRS with PQ= (7b-5) meters and QR= (2b-0.5) meters. IF S is the midpoint of Line RT, what is the length of line RT

Geometry
MNPQ is a rhombus. The measure of angle MRQ is (13t-1) degrees, and the measure of angle PQR is (7t+4) degrees. what is the measure of angle PQM?

Geometry
The distance from B to D is approximately (x+10) feet, and the distance from A to C is approcimately (2x-5.3) feet. what is the approximate distance from A to C?

math
The distance between goalpost, BC, is three times the distance from the top of the goalpost to the bottom. If the perimeter of ABCD is 21 1/3 yards, what is the length of BC

math
correct

math
seven rolls each tray with 56 rolls =8

US History
Roosevelt created the new deal if that helps

science
rain forest

math
add 9 + 3 =12 there are 24 hours in a day so 24 - 12 =12 answer 12

grammar
is southern a noun

grammar
beaches right

grammar
section,United states,natual,beauty,coastal,cities,citizens,state,pride,charm,state

grammar
What are the nouns in this sentence? 1. Every section of the United States has scenes of natual beauty. 2. Southern coastal cities are proud of their sandy beaches. 3. The citizens of every state take pride in ther charm of their won state.

Math
ý22xn is between 80 and 85 what is n?

econ312
No, his plan will banrupt the country and it will allow the government to run healthcare. They will decide who gets what and when they get it. The United States is not a socialist country. If you ask many Canadians about their health care plan they would tell you that they do ...

chemistry
if A(aq) + B(aq) = AB(aq), and the molarity of A in the solution is 0.60 M and the molarity of B in solution is 0.60M, calculate the enthalpy of the reaction, delta Hrxn, for the formation of 1 mole of AB solution.

chemistry
if A(aq) + B(aq) = AB(aq), and the molarity of A in the solution is 0.60 M and the molarity of B in solution is 0.60M, calculate the enthalpy of the reaction, delta Hrxn, for the formation of 1 mole of AB solution.

calculus
find the sum ∑(n/(n+1)!) from n=1 to infinity

physics
A car travels 12 km due north and then 26.2 in a direction 0/( that is supposed to be a circle with a line through it)67.3 west of north. Find the magnitude of the cars resultant displacement

Physics
Two children are riding on a merry-go-round. Child A is at a greater distance from the axis of rotation than child B. Which child has the larger angular speed?

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

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