Friday

August 22, 2014

August 22, 2014

Total # Posts: 2,531

**Science**

When served at 200 km/h (124 mph), what is the equivalent weight exerted on the tennis ball?
*November 17, 2010*

**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 ...
*November 17, 2010*

**Physics**

I do not know. I am having a hard time finding how to do this.
*November 17, 2010*

**math**

rachel is ranked 72 out of 451 students. whats her class rank percentile?
*November 16, 2010*

**Math- Precalc**

could someone please help me solve this problem... e^x - 12e^(-x) - 1
*November 15, 2010*

**Chemistry**

What is a enantiomer?
*November 14, 2010*

**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 ...
*November 14, 2010*

**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 ...
*November 14, 2010*

**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.
*November 12, 2010*

**Physics**

If it goes under standard level. Exe; sea level is 0 feet. Anything under the sea is x feet below 0.
*November 12, 2010*

**algebra**

two nombers have a sum of 15. one of the numbers is x. Find an expression for the other number
*November 12, 2010*

**chem**

AgNO3 + NaCl produces AgCl + NaNo3 how much AgCl is produced when 3.10g of AgNO3 and .600g of NaCl react?
*November 9, 2010*

**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 ...
*November 8, 2010*

**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
*November 7, 2010*

**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
*November 6, 2010*

**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
*November 6, 2010*

**chemistry**

Is the ritalin molecule a polymer?
*November 5, 2010*

**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?
*November 4, 2010*

**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?
*November 4, 2010*

**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
*November 4, 2010*

**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?
*November 4, 2010*

**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?
*November 4, 2010*

**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
*November 4, 2010*

**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?
*November 4, 2010*

**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?
*November 4, 2010*

**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
*November 4, 2010*

**math**

correct
*November 4, 2010*

**math **

seven rolls each tray with 56 rolls =8
*November 4, 2010*

**US History**

Roosevelt created the new deal if that helps
*November 4, 2010*

**science**

rain forest
*November 4, 2010*

**math**

add 9 + 3 =12 there are 24 hours in a day so 24 - 12 =12 answer 12
*November 4, 2010*

**grammar**

is southern a noun
*November 4, 2010*

**grammar**

beaches right
*November 4, 2010*

**grammar**

section,United states,natual,beauty,coastal,cities,citizens,state,pride,charm,state
*November 4, 2010*

**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.
*November 4, 2010*

**Math **

ý22xn is between 80 and 85 what is n?
*November 4, 2010*

**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 ...
*November 4, 2010*

**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.
*November 1, 2010*

**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.
*November 1, 2010*

**calculus**

find the sum ∑(n/(n+1)!) from n=1 to infinity
*November 1, 2010*

**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
*October 31, 2010*

**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?
*October 28, 2010*

**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?
*October 28, 2010*

**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).
*October 27, 2010*

**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?
*October 27, 2010*

**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?
*October 26, 2010*

**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 ...
*October 26, 2010*

**geometry**

How do I find the length of the segment AB when A(-4,6) and B(3,-5)
*October 26, 2010*

**chemistry**

a copper block has a mass off 80 grames and occupies a volume of 9.5cm3 calculate its density
*October 26, 2010*

**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
*October 26, 2010*

**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?
*October 25, 2010*

**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
*October 25, 2010*

**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...
*October 25, 2010*

**physics**

How long does it take for the ball to reach the wall if it is 5.2 m away?
*October 25, 2010*

**physics**

How high is the ball when it hits the wall?
*October 25, 2010*

**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?
*October 25, 2010*

**chemistry**

o oops hahah thankss for answering my question!
*October 24, 2010*

**chemistry**

thank doctor bob pursley thats right i know who you are.
*October 24, 2010*

**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
*October 24, 2010*

**chemistry**

where did you get the .5M from? Ca(NO3)2 is .25M
*October 24, 2010*

**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?
*October 24, 2010*

**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??
*October 24, 2010*

**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.
*October 24, 2010*

**Statistics**

A spinner has three outcomes, each half as likely as the one before it. How can I set this up?
*October 23, 2010*

**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.
*October 23, 2010*

**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
*October 21, 2010*

**MATH**

35 degrees 90 - 65 = 35
*October 21, 2010*

**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
*October 21, 2010*

**Math**

7000/100,000 = x/100 Cancel out three zeroes to get 7/100
*October 21, 2010*

**physics**

How did you figure this problem out? How did you work it out?
*October 21, 2010*

** 8th grade earth science**

how to find the longitude of meridians
*October 20, 2010*

**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?
*October 20, 2010*

**5th grade**

how to keep a watershed heathly?
*October 18, 2010*

**physics**

YOU SHOULD KNOW
*October 17, 2010*

**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 ?
*October 16, 2010*

**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.
*October 12, 2010*

**marketing**

Quantitative researh would be best because it deals with numbers. But i am not quit sure what the question is asking:(
*October 12, 2010*

**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
*October 12, 2010*

**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 ...
*October 12, 2010*

**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...
*October 11, 2010*

**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.
*October 11, 2010*

**Chemistry**

0.274g H
*October 9, 2010*

**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.
*October 8, 2010*

**Caring for school age childres**

B.family
*October 8, 2010*

**Social Studies**

Discovering America.
*October 7, 2010*

**AP Chemistry**

I can't get EXACTLY 68 grams of water; dunno how to change equation without using a fraction.
*October 7, 2010*

**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?
*October 7, 2010*

**1st grade**

Subtraction. 100 but take out 1. 100 minus 1. 100 - 1. 99.
*October 7, 2010*

**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 ...
*October 7, 2010*

**math**

No.
*October 7, 2010*

**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 ...
*October 7, 2010*

**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
*October 7, 2010*

**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?
*October 7, 2010*

**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?
*October 6, 2010*

**6th grade**

I NEED EXAMPLES OF ARCHIPELAGO
*October 6, 2010*

**math**

ohh ohh i get it i get it now . Yea we did it right.
*October 6, 2010*

**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 .
*October 6, 2010*

**math**

I got 3 . lol hbu ?
*October 6, 2010*

**math**

Yea i know i dont get this either !!
*October 6, 2010*

**algebra) **

how do i identify the property shown in a number sentence..ex. 5x(2x4)=(5x2)x4
*October 5, 2010*

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