# jen

Popular questions and responses by jen-
## physics

A 2500N pile-driver ram falls 10m and drives a post 0.1m into the ground. Find the average impact of force on the ram.

*asked on July 27, 2010* -
## statistics

Go to a local library; collect a sample of books consisting of the ages of book (based on copyright dates). Plan and describe the sampling procedure, then use the results to construct a confidence interval estimate of the mean age of all books in the

*asked on June 26, 2015* -
## Exponents-word problem

A culture starts at 8600 bacteria. After one hour the count is 10,000. Find a function that models the number of bacteria n(t) after t hours. The answer is n(t) = 8600e^.1506t Where does this 0.1506 come from? Thanks. n(t) = 8600 e^(kt), where k is an

*asked on February 16, 2007* -
## math

From a bag of peanuts, phillip took 1/3, then joy took 1/4 of the remaining, brent took 1/2 of the remaining, and preston took 10. There were 71 peanuts remaining....how many were there to start?

*asked on July 6, 2013* -
## Math

A coin is biased so that a head is twice as likely to occur as a tail. If the coin is tossed 3 times, what is the probability of getting 2 tails and 1 head? What do you mean by biased in probability?

*asked on October 15, 2015* -
## Statistics

A company manufactures calculators in batches of 64 and there is a 4% rate of defects. Find the probability of getting exactly three defects in a batch.

*asked on February 4, 2008* -
## Calculus

The line that is normal to the curve x^2=2xy-3y^2=0 at(1,1) intersects the curve at what other point? Please help. Thanks in advance. We have x2=2xy - 3y2 = 0 Are there supposed to be 2 equal signs in this expression or is it x2 + 2xy - 3y2 = 0 ? I'll

*asked on October 15, 2006* -
## Statistics

One of the questions in the Pew Internet & American Life Project asked adults if they used the Internet, at least occasionally. The results showed that 454 out of 478 adults aged 18 - 29 answered yes; 741 out of 833 adults aged 30 – 49 answered yes; 1058

*asked on June 16, 2014* -
## College Physics

A fisherman notices that his boat is moving uo and down periodically, owing to waves on the surface of the water. It takes 2.5 s for the boat to travel from its highest point to its lowest, a total distance of 0.62 m. The fisherman sees that the wave

*asked on October 26, 2007* -
## Algebra

The arch of the bridge below is half an ellipse, a "semi-ellipse". The arch is 148m long and has a height of 48m at the center. The height of the arch is 10m at point p. What is the distance from p to the center?

*asked on January 25, 2017* -
## Math

Given that x=log3^5 and y=log3^2, rewrite log3^60 in terms of x and y.

*asked on April 20, 2016* -
## physics

You drop a ball from a height of 2.0 m and it bounces back to a height of 1.5 m (a) What fraction of its initial energy is lost during the bounce? (b) What is the ball’s speed just at it leaves the ground after the bounce?

*asked on August 19, 2010* -
## chemistry

What atomic or hybrid orbitals make up the sigma bond between As and F in hexafluoroarsenate ion, AsF6- ? orbital on AS:? orbital on F:?

*asked on September 30, 2009* -
## statistics

Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7.5 grams of fat per pound. A random sample of 34 farm-raised trout is selected. The mean fat

*asked on October 23, 2011* -
## Civic

One factor determining the number of representatives for a given congressional district is the distribution of _____ within the state A. registered voters B. population C. jobs D. wealth Answer is "B"

*asked on May 17, 2013* -
## chemistry

Question 1. A Compound Containing 3 Atoms Of Carbon & 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The 2 End Products Of This Equation Are Carbon Dioxide &water. What Element Should You Look At 1st In Balancing This Equation? Choose

*asked on September 23, 2008* -
## Eng

Which statement is most accurate regarding the speaking-writing connection? A. To own a word, write it over and over again. B. Written words seldom reflect the words people use when they speak. C. To own a word, speak it. D. The words used by writers are

*asked on June 25, 2013* -
## math

Using the numbers 2,3,5,10,24 write two separate equations that equal 120

*asked on May 6, 2014* -
## stastics

If 1.5% of the bolts made by an automotive factory are defective, what is the probability that in a shipment of 200 bolts, there are 6 defective bolts? Place your answer, rounded to four decimal places, in the blank.

*asked on July 8, 2012* -
## chem 15

The hardness of water (hardness count) is usually expressed as parts per million (by mass) of calcium carbonate. What is the molar concentration of calcium ions in a water sample with a hardness count of 175ppm?

*asked on November 8, 2016* -
## General Science

When I2 dissolves in methanol, CH3OH, what type of forces exist between I2 and CH3OH molecules in solution?

*asked on February 19, 2008* -
## Civics

which of the following is not an authoritarian form of government? A. Totalitarianism B. Absolute monarchy C. Dictatorship D. Direct democracy Answer is "C"

*asked on May 11, 2013* -
## physics

A model rocket leaves the ground, heading straight up at 47 m/s. (a) What is its maximum altitude? m What are its speed and altitude at each of the following times? (b) 1 s m/s m (c) 4 s m/s m (d) 8 s m/s m

*asked on January 16, 2011* -
## Statistics (Check Work)

Can Someone help me with these 2 problems? I am certain I am solving them correctly, but for some reason the computer keeps marking my answers as incorrect. Question 1: Minnesota had the highest turnout rate of any state for the 2012 Presidential election.

*asked on June 26, 2014* -
## Civic

The present-day Republican Party is descended from the ____ Party. A. Anti-Federalist B. Democratic Republican C. Federalist D. Conservative Answer is "D"

*asked on May 20, 2013* -
## chemistry

use standard enthalpies of formation to calculate delta Hrxn for the following reaction. 2H2S(g)+3O2(g)-->2H2O(l)+2SO2(g) express the answer using four significant figures Delta Hrxn = ? kJ

*asked on October 25, 2011* -
## AP Chemistry

The formulas for ethanol and ammonium nitrate are C2H5OH and NH4NO3. In what respects are these formulas and compounds different? Am I supposed to say that there are different elements that make up the compounds?

*asked on September 5, 2011* -
## Latin I

Primo (at first), natura ab viris adorabatur. Antequam (afterwards), viri et feminae deos et deas laudabant. Tum (Then) animas naturae laudabant. Animae naturae timebantur. Viri rogabant: De quo luna (moon) venit (comes)? De quo sol (sun) venit (comes)?

*asked on February 10, 2015* -
## Latin I

1. Estne in Campania? a. where is Campania? b. he is in Campania, isn't he? c. he is not in Campania, is he? d. Is he in Campania? 2. Vesuviusne populum terruit? a. did vesuvius frighten the people? b. Vesuvius did not frighten the people, did it? c.

*asked on February 9, 2015* -
## Latin I

“Arms and the man I sing”—With these words Virgil began his poem about the origins of the Rome. The “wars” were not only the famous Trojan War, but also the wars in Italy; “the hero” is Aeneas, who traveled from Troy to a new town, New Troy,

*asked on April 11, 2015* -
## Algebra

Suppose that the functions q and r are defined as follows: q(x)=2x+1 r(x)=-2x^2+1 Find the following: (qOr)(4)= (rOq)(4)=

*asked on January 28, 2011* -
## Trigonometry

How do i find cos(2arctan(7/24)) Thanks.

*asked on November 12, 2008* -
## speaker vs. poet

What the importance of knowing the difference between the speaker and the writer in a poem?

*asked on February 27, 2008* -
## Joint variation

A variable 'f' varies jointly as 'g' and the square of 'h' and inversely as 'j'. If f=-14 when g=5, h=8, j=20, what is 'f' when g=4, h=6 and j=9? Thanks. F=Constant*gh/j Use the data for determine the constant. Then, use the second set of data to determine

*asked on February 7, 2007* -
## Math

Write a negation of the statement. Not all people like football.

*asked on July 12, 2011* -
## Physics

A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.90 s. How high is the cliff?

*asked on October 23, 2010* -
## chemistry

why should excess alkali be avoided in the ferric chloride test for acetic acid and benzoic acid?

*asked on March 30, 2018* -
## algebra

Chris can be paid in one of two ways. Plan A is a salary of $380 per month, plus a commission of 9% of sales. Plan B is a salary of $656 per month, plus a commission of 3% of sales. For what amount of sales is Chris better off selecting

*asked on July 28, 2017* -
## Chemistry

If the heat from burning 5.800 g of C6H6 is added to 5691 g of water at 21 °C, what is the final temperature of the water? 2C6H6(l) +15O2 (g)----> 12CO2(g)+6H2O(l) +6542

*asked on February 10, 2012* -
## linear algebra

what is the basis of a subspace or R3 defined by the equation 2x1+3x2+x3=0 I know the basis is vectors and but how do you get that?

*asked on May 16, 2010* -
## chemistry

In clinical lab reports, some concentrations are given in mg/dL. Convert a Ca2+ concentration of 3.5 mg/dL to weight/volume percent.

*asked on March 28, 2010* -
## Hinduism Essay-help

I have to write an essay on Hinduism for my college class (Religions of the world. One question I'm having a difficult time answering is.. Explain the desire for liberation from earthly existence. Any ideas on what this means? My understanding is

*asked on June 14, 2009* -
## geography

why is Washington DC. included in the southeast region?

*asked on January 19, 2009* -
## Physics

A box is sliding down an incline tilted at an angle of 2.14° above horizontal. The box is sliding down the incline at a speed of 5.15 m/s. The coefficient of kinetic friction between the box and the incline is 0.387. How far does the box slide down the

*asked on June 25, 2015* -
## statistics

Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2 degrees F and a standard deviation of .62 degrees F. suppose we take a sample of eight healthy adults. what is the probability that their mean body temperature

*asked on December 6, 2011* -
## Math-CONFUSING!!

Write the compound statement in symbols. Let r = The food is good, p = I eat too much, q = I'll exercise. If the food is good and I eat too much, then I'll exercise.

*asked on July 15, 2011* -
## chemistry

1. Which of the following statements about the cell theory is correct? a) All living organisms are made up of one or more cells. b) All cells arise from other, pre-existing cells c) All eukaryotic cells contain symbiotic prokaryotes. d) All prokaryotic

*asked on February 10, 2010* -
## elementary math for teachers

F25 = 75,025 and F26 = 121,393 where Fn is the nth term in the Fibonacci sequence. Find F27.

*asked on October 15, 2009* -
## solving trig. equations

tan(3x) + 1 = sec(3x) Thanks, pretend 3x equals x so tanx + 1 = secx we know the law that 1 + tanx = secx so tanx + 1 becomes secx and... secx = secx sec(3x) = sec(3x) [just put 3x back in for x- you don't really have to change 3x to x but it kinda makes

*asked on April 12, 2007* -
## Math

What is the rectangular equivalence to the parametric equations? x(θ)=4cosθ+2,y(θ)=2sinθ−5 , where 0≤θ

*asked on May 19, 2020* -
## History

Hi I'm honestly stuck on these 3 questions, I looekd on wiki and everything. Please Please help me out.. What action did President Polk take that resulted in the war between the United States and Mexico? He ordered troops to invade Mexico and capture Vera

*asked on December 21, 2014* -
## Calc

An Olympic-sized swimming pool is a rectangular prism that is 50m long, 25m wide, lled with water to a depth of 1.5m. We are going to pump the water out of the pool with a pump that is 0.5 meters above the surface of the water. Compare the costs of

*asked on May 18, 2014* -
## Chemistry

Hydrogen sulfide is an impurity in natural gas that must be removed. One common removal method is called the Claus process, which relies on the reaction: 8 H2S(g) + 4 O2(g)--> S(l) + 8 H2O(g) Under optimal conditions the Claus process gives 98% yield of S8

*asked on October 31, 2011* -
## trig

how do you find all the values of theta from 0 degrees through 360 degrees for which sin theta equals 0

*asked on August 18, 2011* -
## Math

A social security number consists of nine digits. How many different social security numbers are possible if repetition of digits is permitted? Oh goodness, I'm not sure what number to start with :(

*asked on July 23, 2011* -
## Math

Write the compound statement in symbols. Let r = The food is good, p = I eat too much, q = I'll exercise. If the food is good and I eat too much, then I'll exercise.

*asked on July 15, 2011* -
## Physics

A 15.0 kg box is released on a 32 degree incline and accelerates down the incline at 0.30m/s sqaured ? find the friction force impeding its motion. What is the coefficient of kinectic friction?

*asked on February 15, 2011* -
## Algebra

Solve the formula for the given variable. Assume all variables represent nonnegative numbers. A=6s^2, for s A. A/6 B. SQRT A/6 C. -SQRT A/6 D. Not given I believe the anser is B, but not 100% sure

*asked on November 22, 2009* -
## math

How many different sequences of 4 digits are possible if the first digit must be 3, 4, or 5 and if the sequence may not end in 000? Repetition of digits is allowed. A) 2000 B) 2997 C) 2999 D) 1512

*asked on November 18, 2009* -
## More Physics

A light plank rests on two scales that read Fg1 = 410 N and Fg2 = 310 N. The scales are separated by a distance of 2.00 m. How far from the woman's feet is her center of gravity (the woman is laying on a plank with scales on both ends supporting the woman

*asked on December 3, 2006* -
## algebra

What is the discriminant of the polynomial below? 4x2 + 4x + 1 A. 0 B. -4 C. -12 D. 32

*asked on March 18, 2015* -
## algebra

w(3w-1)=200 solve for w

*asked on November 16, 2014* -
## Math

A truck with 36-in.-diameter wheels is traveling at 55 mi/h. Find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes How many revolutions per minute do the wheels make? • This question is 2 parts. I can't

*asked on September 2, 2014* -
## Physics

A certain freely falling object requires 1.50 seconds to travel the las 30.0 meters before it hits th ground. From what height above the ground did it fall?

*asked on September 22, 2012* -
## CHEMISTRY

You mix 40.0 g of ethanol (C2H5OH, molecular weight = 46.1 g/mol) and 60.0 g of water (molecular weight = 18.0 g/mol) The resulting solution has a density of 920 g/L. a)Calculate the molarity of ethanol in this solution? Answer : 0.06 kg of H2O This is

*asked on March 18, 2012* -
## AP chem

A 1.25-g sample contains some of the very reactive compound Al(C6H5)3. On treating the compound with aqueous HCl, 0.951 g of C6H6 is obtained. Al(C6H5)3(s) + 3HCl(aq) --> AlCl3(aq) + 3C6H6(l) Assuming that Al(C6H5)3 was converted completely to products,

*asked on September 6, 2011* -
## Math-probability

One card is selected at random from a deck of cards. Determine the probability that the card is a black heart.

*asked on July 19, 2011* -
## writing

"We find comfort among those who agree with us—growth among those who don’t" What does this mean? I need to write an essay on this. Please help. Thanks.

*asked on January 10, 2008* -
## Navigation

A fisherman leaves his home port and heads in the direction N 70 degree W. He travels 30 mi and reaches Egg Island. The next day he sails N 10 degree E for 50 mi, reaching Forrest Island. a) Find the distance between the fisherman's home port and Forrest

*asked on March 27, 2007* -
## calculus

If y is a differentiable function of x, then the slope of the tangent to the curve xy - 2y + 4y^2 = 6 at the point where y=1 is ...... How do I do this? Thanks. xy - 2y + 4y^2 = 6 ---> d[xy - 2y + 4y^2] = 0 ---> xdy + ydx - 2dy + 8ydy = 0 ---> (x + 8y -

*asked on December 3, 2006* -
## Chemistry

Write the net ionic equation for the equilibrium that is established when ammonium nitrate is dissolved in water. (Use H3O+ instead of H+)

*asked on September 27, 2016* -
## math

: Use the formula from Part I to find the midpoint of the segment with endpoints at (-2, -1) and (0, 9). Show your work.

*asked on February 24, 2016* -
## chemistry

the concentration of urea in a solution prepared by dissolving 16g of urea in 39 g of H2O is ________% by mass. The molar mass of urea is 60.0 g/mol

*asked on May 27, 2013* -
## Eng B

After having lived with her for a year, Chad studied Marilou's eyes across the table, realizing he had never had a clue about what make her tick." This sentence from a hypothetical nevel suggests voice? A. Third person restricted omniscience B. first

*asked on April 30, 2013* -
## Eng B

An author of detictive novel is most lkely to use figurative language to A. Entertain the reader. B. help the reader visualize a character. C. suggest hidden meanings. D. mislead the reader. Answer is "B"

*asked on April 28, 2013* -
## Chemistry

ou are given the following data. S(s) + 3/2 O2(g) → SO3(g) ΔH = -395.2 kJ 2 SO2(g) + O2(g) → 2 SO3(g) ΔH = -198.2 kJ Calculate ΔH for the reaction below. S(s) + O2(g) → SO2(g)

*asked on March 13, 2013* -
## Math

ABC Bank offers a savings account with 4.5% compounded quarterly. Find the APY the bank's savings account offers (round your answer to three decimal places).

*asked on January 9, 2013* -
## CHEMISTRY HELP

1) The specific heat of solid copper is 0.385 J/g(C). What thermal energy change occurs when the temperature of a 34.10 g sample of copper is cooled from 35.7 degrees Celsius to 13.9 degrees Celsius? Answer: -286.3 J This amount of heat is used to melt

*asked on October 17, 2011* -
## Math-Please help

Evaluate 5C3

*asked on July 28, 2011* -
## Math-geometry

Write the statement in symbols using the p and q given below. Then construct a truth table for the symbolic statement and select the best match. q = The food is good. p = I eat too much. If the food is not good, I won't eat too much.

*asked on July 12, 2011* -
## College Math

Determine whether the pairs of sets are equal, equivalent, both, or neither. A = {7, 9, 10}, B = {a, b, c}

*asked on July 5, 2011* -
## Calculus

find the volume OUTSIDE the cylinder x^2+y^2=9 and INSIDE the sphere x^2+y^2+z^2=25

*asked on April 25, 2011* -
## physics

an unstretched hanging spring is 50cm long. suspending a 100N weight from it makes its lenght 60cm. Adding another 100N weight will make the spring -- 60cm, 70 cm, 80 cm, 100 cm, or 120 cm. No idea how they came up with any of the five ??? My answer was

*asked on July 12, 2010* -
## solving for variable

2=(1.01)^n how do you solve for n

*asked on April 9, 2009* -
## physics

consider three charges: +Q, -Q, q where the center charge is equidistnat from the other two. assum that the two Qs cannot move. you also want to charge q to be at rest. if q=-8.0 nC, find Q+ You don't have to solve it but can you lead me in the right

*asked on January 15, 2009* -
## Chemistry

Question 1. A Compound Containing 3 Atoms Of Carbon & 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The 2 End Products Of This Equation Are Carbon Dioxide &water. What Element Should You Look At 1st In Balancing This Equation? Choose

*asked on September 23, 2008* -
## Math

The combinations on the lockers at the highschool consist of three numbers, each ranging from 0 to 39. If a combonation is chosen at random, what is the probablity that the first two numbers are multiples of 9, and the third number is a multiple of 4?

*asked on July 21, 2008* -
## how to write a check

this is my second time writing a check, and I know how, but How do i write $1,464.00 in words on a check. Is it "one thousand four hundred sixty four dollars" Is it hundred or hundreds? Do I need to say something about the zero cents?

*asked on May 19, 2008* -
## Maths

Amortization of a $1000 Loan Interest Monthly payment rate 15yr 20yr 25yr 30yr 9.5% $10.45 $9.33 $8.73 $8.41 10.0% $10.75 $9.66 $9.09 $8.78 10.5% $11.06 $9.99 $9.45 $9.15 11.0% $11.37 $10.33 $9.81 $9.53 11.5% $11.69 $10.66 $10.16 $9.90 12.0% $12.01 $11.01

*asked on March 12, 2008* -
## Calculus

Find normals to the curve xy+2x-y=0 that are parallel to the line 2x+y=0 I have the answer: at(-1,-1), y=-2x-3, and at (3,-3), y=-2x+3 How do we get this? Thanks. xy + 2x - y=0 x dy/dx + y + 2 - dy/dx=0 dy/dx (x-1)= -y-2 dy/dx= - (y+2)/(x-1) The normal to

*asked on October 16, 2006* -
## Chemistry

Each equation has to be balanced, please help 1. Erbium metal (Er) can be prepared by reacting erbium(III) fluoride with magnesium; the other product is magnesium fluoride. (a) What substance is reduced? (b) What is the reducing agent? (c) What substance

*asked on July 11, 2019* -
## chemistry

Why do alcohols that show little tendency to dissolve in water appear to dissolve readily in 85% phosphoric acid? Would you describe the latter behavior as solubility or a chemical reaction? Explain

*asked on March 24, 2018* -
## Social studies

5. What effect on the Columbian exchange does this image illustrate? (A). The population boom of domesticated animals that escaped into the wild. (B). The conversion of the physical environment.*** (C). The introduction of milk cows to the North Americans

*asked on September 13, 2017* -
## Chemistry

How many electrons in an atom could have these sets of quantum numbers? n=2 n=5, l=3 n=6, l=1, ml=-1

*asked on November 13, 2016* -
## Math -Trig

Determine the exact value if cot(3pi/4) using special triangles. I don't understand how it could be 1/tan3pi/4 in a triangle....

*asked on May 3, 2016* -
## Physics

An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of

*asked on April 28, 2016* -
## Physical Science

Which of the following statements are true about chemical reactions? Check all that apply. A. Reactants are on the right when writing a chemical reaction. B. Products are produced in a reaction. C. Reactants are present at the end of a reaction. D.

*asked on January 27, 2015* -
## accounting

Accrued salaries 1 Bill’s Company Partial Worksheet For the Year Ended December 31st, 2012 Account Titles Trial Balance Adjustments Adjusted Trial Balance Debit Credit Debit Credit Debit Credit Merchandise Inv. 16 Store Supplies 10 Store Equipment 20

*asked on October 6, 2014* -
## math

rachel drove 260 miles using 12 gallons of gas. at this rate, how many gallons of gas would she need to drive 286 miles?

*asked on May 26, 2014* -
## chem

the balance equation for the reaction of aqueous sulfuric acid with aqueous ammonia is 2NH3(aq)+ H2SO4(aq) -> (NH4)2SO4(aq) 1. what volume of 0.250M sulfuric acid solution would be needed to react completely with 18.00mL of 0.350M ammonia solution? 2. what

*asked on April 15, 2014*