Sunday

October 4, 2015
Total # Posts: 1,082

**Calculus**

Thanks again for responding. When we earlier did h=0, the formula was dh/dt=5/2pi=.8 in/min. Intuitively, it makes sense that the rate would reduce as the cup is filling up since the radius is increasing. So, should the answer above have 10 in the numerator instead of 40. Then...
*December 18, 2011*

**Calculus**

A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast is the water level rising now?
*December 18, 2011*

**Calculus**

In the 2nd question (rate of water rising now), how do you calculate r?
*December 17, 2011*

**Calculus**

OK, I understand now. Thanks for all of your help.
*December 17, 2011*

**Calculus**

Thanks. I think that I understand the 1st question now. How about the other questions?
*December 17, 2011*

**Calculus**

A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast was the water level rising 4 minutes ago? How fast is the water level rising now? What will the rate be when ...
*December 17, 2011*

**physics**

So I figured this out myself a=v^2/r which is also equal to (4pi^2*r^2)/T^2 and T is 86400 secs which is how long it takes for a day to pass
*December 15, 2011*

**physics**

How would I know W if that wasn't given?
*December 15, 2011*

**physics**

radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks
*December 15, 2011*

**physics**

should be 2.24m/s use the equation F=m(v^2/r)
*December 15, 2011*

**bio**

Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary
*December 12, 2011*

**bio**

Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary
*December 12, 2011*

**algebra**

write an equation of the direct variation that includes the given point, (-5/6, 6/5)
*December 11, 2011*

**article**

articles either about animals or specific ecosystems
*December 11, 2011*

**article**

where can i find articles on the ecosystem ?
*December 11, 2011*

**6th grade Science**

Please help me with the questions? 1) How do you respond to some stimuli in your environment? The examples I wrote are: If I am hungry, I will eat food. If I am cold, then I will put on a jacket? 2) What does the fur of a bear have to do with homeostatis? I wrote that the fur ...
*December 9, 2011*

**Calculus**

its from 1 to 3 on the x axis including when it crosses underneath, you subtract that (its like negative area)
*December 8, 2011*

**Calculus**

Finding area under a curve From [1,3] 2x^2 -4x +1
*December 8, 2011*

**Physics**

Divers dive straight out from a cliff that is 21 m high. If the rocks below the cliff extend outward for 15 m, what is the minimum horizontal velocity a diver must have to clear the rocks safely
*December 4, 2011*

**ochem**

how to determine equivalent hyfrogens in hnmr?
*December 3, 2011*

**chem**

why do we use a weak acid or water and not a concentrated acid with NaBh4,etoh reagent?
*December 2, 2011*

**Math**

The equation y=2x+7 represents a linear relationship that is non-proportional. What changes could I make to the equation to make it proportional? Thanks
*November 29, 2011*

**Economics**

Variable cost divided by the change in quantity produced is A. average variable cost. B. marginal cost. C. average total cost. D. None of the above is correct.
*November 29, 2011*

**pol sci**

what impact is the California dream act( ab 131) going to have on us citizens or legal immigrants?
*November 26, 2011*

**soc..**

write a essay describing de jure segregation include why was it established , what happen with de jure segregation from reconstruction to the civil rights movement , and how was jim crow enforced throughout this period
*November 26, 2011*

**busi/stats**

list 3 ways we can reduce the size of a sample, none of which has any direct relationship to the size of the population
*November 22, 2011*

**busi/stats**

The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. ...
*November 22, 2011*

**Spanish 8th grade**

I have to put these in the past tense-Are they correct? 1. Tú hablas por teléfono. Tú habaste por teléfono. 2. Nosostros bailamos mucho los fines de semana. This would be the same in past tense, I think?? 3. Tú y yo cantamos los domingos. ...
*November 16, 2011*

**Spanish**

Thank you
*November 16, 2011*

**Spanish**

Could you please check these-I had to answer the questions. 1.¿Bailaste ayer? Sí,yo bailé ayer. 2.¿Caminaste a la escuela hoy? Sí, yo caminé a la escuela hoy. 3.¿Visitaste a tus primos el domingo pasado? Sí, yo visit&...
*November 16, 2011*

**physics **

can some one explain how to do this The muzzle velocity of 60g bullet leaving 4kg rifle is 500 m/s towards the east. What is recoil velocity of the rifle?
*November 16, 2011*

**geometry**

if area of triangle wxz is 48 cm squared, x =10 cm, xz = 10 cm, middle =8 cm then what is the perimeter of wxz
*November 15, 2011*

**stats**

The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. ...
*November 11, 2011*

**stATS**

the standard deviation of the sampling distribution of the means is ____the standard deviation of the population under study.
*November 4, 2011*

**Chemistry 121**

Is 450g of oxygen enough to burn 125g of butane according to the following equation? C4H10 + O2 ---> CO2 + H2O? show why or why not?
*November 3, 2011*

**Chemistry 121**

How many grams of KCl would be produced from the complete decomposition of 2.75g of KClO3?
*November 3, 2011*

**Chemistry 121**

How much oxygen would be needed to completely burn 250g of propane?
*November 3, 2011*

**Calculus**

A ship sailing parallel to shore sights a lighthouse at an angle of 12 degrees from its direction of travel. After traveling 5 miles farther, the angle is 22 degrees. At that time, how far is the ship from the lighthouse?
*October 23, 2011*

**chem**

Explain clearly why changes in base concentration do not affect the observed reaction rate of an E1 elimination.
*October 23, 2011*

**chemistry**

12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.08 M C2H3O2-. What is the pH of the resulting solution?
*October 21, 2011*

**chemistry-acid/base extraction.**

I do not understand acid base extraction. why should we mix, for example, an organic and aqueous compound to then separate them from each other. please explain confused....
*October 21, 2011*

**Algebra**

Find the percent of error of each measurement. 0.2cm 0.4cm
*October 20, 2011*

**Algebra**

This is soooo confusing! An airplane flies from New Orleans, Louisiana, to Atlanta, Georgia, at an average rate of 320 miles per hour. The airplane then returns at an average rate of 280 miles per hour. The total travel time is 3 hours. A. Define a variable for the flying time...
*October 14, 2011*

**Algebra**

Yeah, I did it right! Thank you!!
*October 14, 2011*

**Geography**

Following the breakup of the Soviet Union, what are some of the major problems faced by many of the new countries? Thanks.
*October 13, 2011*

**buss/stats**

what is it called when all the items in the population have the same chance of being selected for the sample?
*October 8, 2011*

**science**

Slight issue in the question. It should say the dog has a momentum of.. not moment. Momentum is mass x velocity, so if we know the velocity (it's in the question) we can divide the momentum by the velocity to get the mass. 60 (kg m/s) / 3 (m/s) = 20 kg. Could well be a ...
*October 6, 2011*

**question**

thank you very much
*October 5, 2011*

**question**

But critical writing like argumentative essays have structure. (can you tell me what is wrong with this message?)
*October 5, 2011*

**physics**

What quantity is given by the gradient of such a graph?
*October 2, 2011*

**Math**

Edit...25 balls in the bowl..
*October 1, 2011*

**Math**

There are 20 balls in a bowl. 7 black, 6 blue, 5 green, 4 red, and 3 yellow. Balls must be drawn until 4 different colors are drawn. What is the probability that one is black? Please walk me through if you can...
*October 1, 2011*

**Physics 9th grade**

no
*September 26, 2011*

**math**

On a board game if you landed on red you move ahead 1 space,land on blue you move ahead 2 spaces,and land on orange you move back 1 space. If you took 30 spins where would you expect to land relative to where you started?
*September 22, 2011*

**American Government **

In The Declaration of Independence how did they signify the colonists’ relationship to Britain?
*September 19, 2011*

**English**

what is John updike`s message in this paragraph? The next morning, I went back to the open vantage from which we had watched the tower so dreadfully slip from sight. The fresh sun shone on the eastward façades, a few boats tentatively moved in the river, the ruins were ...
*September 13, 2011*

**physics**

a stone tied at one end of a string of length,l is whirled in a horizontal circle with constant linear speed,v.which of the following expressions describe the relation between the radius of the circle,r and the angle between the string and the vertical axis?
*September 11, 2011*

**social studies**

Although the Chesapeake and New England colonies differed in many ways, relations with Native Americans followed a similar course in both regions. Why? What were the biggest factors in relations between the two sides? Did relations change over time and why?
*September 10, 2011*

**social studies**

in what ways?
*September 10, 2011*

**social studies**

In what ways did English settlement patterns differ according to region and environmental factors?
*September 10, 2011*

**Psychology**

Can anyone explain to me what they are trying to ask in this question. What is the difference between the Sympathetic Nervous System response and the HPA Axis in terms of both process and function?
*September 8, 2011*

**buss/stats**

Sorry the full question is A loaf of bread is normally distributed with a mean of22 oz. and a standard deviation of 0.5 oz. a, what is the probability that a loaf is btwn 22.75and 23.00? B, 5% of the loafs will weigh less than_____ ounces? C, assuming 200 loaves are baked on a...
*September 6, 2011*

**bussi./stats**

what is the probability that a loaf of bread is between 22.75 and 23.00?
*September 6, 2011*

**Math**

Write the rectangular equation in polar form. (x – 4)2 + y2 = 16
*September 5, 2011*

**PreCal**

Thanks, I am understanding now.
*September 5, 2011*

**bus/stats**

a sample of the personal files of eight male employees revealed that, during a six-month period, they lost the following number of days due to illness: 2,0,6,3,10,4,1 and 2. Calculate the standard deviation of the above sample? the means deviation is 2.375? but not sure how to...
*September 3, 2011*

**MATHS**

Four points lie in a plane. They are partitioned into two pairs so that the sum of the lengths of the segments joining the points of each pair has the minimal possible value. Prove that these segments have no common points.
*September 3, 2011*

**bus. /stats**

Use the data given in the table to construct a frequency distribution and ogive? Before constructing a dam on a Hill river, the Army corps of engineers performed a series of tests to measure the water flow past the proposed location of the dam. The results of the testing were ...
*September 3, 2011*

**buss./stats**

a sample of the personal files of eight male employees revealed that during a six month period they lost the following number of days due to illness 2, 0, 6, 3, 10, 4, 1, 2 calculate the standard deviation show your work
*September 2, 2011*

**business and stats**

What type of data is the projected return on an investment? Qualitative , continous, attribute,discrete or none of the above
*August 31, 2011*

**Communication**

For the following, state the value of the discriminant and then describe the nature of the sloution. -3x^2-8x-19=0
*August 2, 2011*

**English**

I need to check my work on diagramming this question. How many players are on a team? I think it should be as follows: How (adverb) many (adjective) players (direct object) are (past tense verb) on (proposition) a (definite article) team (subject of proposition)? Does this ...
*August 1, 2011*

**College algebra**

Solve. V^2-6v-16=0
*July 31, 2011*

**Algebra**

How do i simplify 3n^2+3n/6n^2+9 by removing factors of 1
*July 29, 2011*

**Math**

what is 3x3x4 is
*July 17, 2011*

**algebra**

10 cm^3 of a normal specimen of human blood contains 1.2 g of hemoglobin. How many grams does 17 cm^3 of the same blood contain?
*July 15, 2011*

**Math**

A firecracker is launched straight up, and its height is a function of time, h(t)= -14^2 + 112t, where h is the height in feet and t is the time in seconds with t=0 corresponding to the instant it launches. What is the height 5 seconds after launch? What is the domain of this ...
*July 8, 2011*

**chem**

What pressure (atm) is exerted by a column of ethanol 86.0 cm high. The density of ethanol is 0.789 g/cm3 and 9.8 m/s2 as your gravitational constant.
*July 6, 2011*

**PHY**

A traveling wave is produced on a rope. The wave travels until it hits a wall and it is reflected. If the speed of the wave is 1.8 m/s and it takes 3.3 s to get back to the starting point, how long (m) is the rope.
*July 5, 2011*

**chem**

The average distance between planet X and Earth is about 1.5 x 10^8 miles. How long (minutes would it take pictures transmitted from a space vehicle on Planet X's surface to reach Earth?
*July 2, 2011*

**chem**

At 36.4°C a sample of ammonia gas exerts a pressure of 6.8 atm. What is the pressure when the volume of the gas is reduced to one-fourth of the original value at the same temperature
*June 29, 2011*

**mirco-economics**

yes
*June 25, 2011*

**mirco-economics**

Help In the first case (Total Fixed Cost equal one million: Total variable cost equal $ 4.4M ($ 4M for wages (fifty thousand workers time eighty dollars per worker) plus four hundred thousand other variable inputs. Average variable cost equal twenty two dollars (Total variable...
*June 25, 2011*

**math**

is the pair of lines parallel x+2y=7 and 2x+4y=3
*June 16, 2011*

**physics**

A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.00 m, and the distance from the fulcrum to the load is 0.250 m. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of the lever? What is ...
*June 8, 2011*

**physics**

3. A man lifts various loads with the same lever. The distance of the applied force from the fulcrum is 1.00 m, and the distance from the fulcrum to the load is 0.250 m. What is the mechanical advantage of the lever? What is the ideal mechanical advantage of the lever? What is...
*June 8, 2011*

**Math**

How do i graph the function y^2=x*(x-4)^2. I have no idea where to begin.
*May 31, 2011*

**human resource management**

1. Critically evaluate the job analysis that Mary conducted for the position of assistant manager. Has she used appropriate methods? What are the strengths and weaknesses of her efforts? 2. What kind of factors about Today's Fashion and its operations should Mary have ...
*May 25, 2011*

**math**

fractions equivalent to 18/24
*May 15, 2011*

**math**

Wats 12yds 2ft + 5yds 2ft
*May 2, 2011*

**physics**

in terms of ph,explain what would if you happen if you if you mixed vinegar with a solution of ammonia what type of products would form
*May 2, 2011*

**math**

if all nos in the equation y/y+101 = 11in base 2, solve for y
*April 27, 2011*

**Compound math**

P*(1+i)* Exponent which is time invested $8000x(1+.o62)30 $8000 x ((1 + .062)^30) = $48,621.1794 U.S. dollars
*April 19, 2011*

**physics**

What mass (in grams) of steam at 100°C must be mixed with 341 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 57.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, and the latent ...
*April 15, 2011*

**physics**

The average rate at which energy is conducted outward through the ground surface in a certain region is 51.6 mW/m2, and the average thermal conductivity of the near-surface rocks is 3.31 W/m·K. Assuming a surface temperature of 11.7°C, find the temperature (in ...
*April 14, 2011*

**math**

thanks! i really appreciate this :)
*April 10, 2011*

**math**

simplify: 1. a^2b^-3 2. (5/3)^-3 3. (a^2b^0c)^0 4. x^-2y^3 5. 3x^-2 6. n^2/n^-3 please help!!
*April 10, 2011*

**Tech401**

How the internet policies of some countries may affect a company's ability to expand globally?
*April 9, 2011*