# Posts by Sarah

Total # Posts: 5,828

**Physics**

How fast (in rpm) must a centrifuge rotate if a particle 8.55 cm from the axis of rotation is to experience an acceleration of 1000 g's? (use 9.8 m/s^2) You may assume constant angular velocity.

**Physics**

A 5.6 kg ball (I=2/3mr^2) starts on a hill 11.3 m above level surface of the ground. The ball then rolls (without slipping) down the hill. What is the linear speed of the ball when it reaches the bottom of the hill?

**Physics**

An ice skater with an initial moment of inertia of 1.44 kg*m^2 is spinning at a rate of 3 revolutions per second. As she extends her arm outward her moment of inertia increases to 2.52 kg*m^2. What is her new angular velocity (in rad/s)?

**LA**

Why did Robert Frost write the Road Not Taken? Why did Walt Whitman write O Captain! My Captain!?

**physics**

how can we derive the work-energy theorem form Newton's second law of motion?

**science help**

acceleration

**calculus check**

If siny=cosx, then find dy/dx at the point (pi/2, pi) A. -1 B. 0 C. 1 D. pi/2 E. None of these I got C

**Calculus check**

Let f(x) be a polynomial function such that f(3)=3, f'(3)=0 and f"(3)=-3. What is the point (3,3) on the graph y=f(x)? A. Relative maximum B. Relative minimum C. Intercept D. Inflection point E. None of these I got C

**Calculus check**

Given f(x)=x^4(2x^2-15). On what interval(s) is the graph of f concave upwards? A. (0, sqrt(3)) B. (-sqrt(3), 0) C. (-sqrt(3), 0) and (0, sqrt(3)) D. (-sqrt(3), sqrt(3)) E. (Negative infinity, -sqrt(3)) and (sqrt(3), infinity) I got E

**Calculus check**

An equation of the line tangent to y=sinx+2cosx at (pi/2, 1) is A. 2x-y=pi-1 B. 2x+y=pi+1 C. 2x-2y=2-pi D. 4x+2y=2-pi I got A

**Calculus check**

The smallest slope of f(x)=6x^2-x^3 for 0 is less than or equal to x is less than or equal to 6 occurs at x= A. 0 B. 2 C. 3 D. 4 E. 6 I got E

**Calculus check**

The limit as x approaches 1 (x^3-1)/(x^2-1) is I got 3/2

**Calculus check**

Find the equation of the line tangent to y=tan2x at x=pi/8 A. y-1=sqrt(2)(x-pi/8) B. y-1=1/2(x-pi/8) C. y-1=1/4(x-pi/8) D. y-1=2(x-pi/8) E. y-1=4(x-pi/8) I got A

**Calculus check**

Given f(x)=4+3/x find all values of c in the interval (1,3) that satisfy the mean value theorem. A. 2 B. Sqrt(2) C. Sqrt(3) D. +or- sqrt(3) E. MVT doesn't apply I got C

**Calculus**

if f'(x)=2(3x+5)^4 , then the fifth derivative of f(x) at x=-5/3 is A. 0 B. 144 C. 1,296 D. 3,888 E. 7,776 I got A

**Calculus check**

If f(5)=3 and f'(5)=-2, find the derivative of x^2f(x) at x=5. A. 0 B. -18 C. -12 D. -20 E. -80 I got D

**Calculus**

The normal (perpendicular) line to the curve y=sqrt(8-x^2) at (-2,2) has slope A. -2 B. 1/2 C. -1/2 D. 1 E. -1 I got A

**Calculus check**

The integral of (x^2-4secxtanx) dx= I got x^3/3-4secx+c

**Calculus check revised.**

y=-1/sqrt(x^2+1) , then dy/dx= A. x/(x^2+1)^1/2 B. x/(x^2+1)^3/2 C. -x/(x^2+1)^1/2 D. -x/(x^2+1)^3/2 E. x/(x^2+1) I got B.

**Calculus check**

Please disregard this question. Sorry and thank you.

**Calculus check**

y=-1/sqrt(x^2+1) , then dy/dx= A. x/(x^2+1)^1/2 B. x/(x^2+1)^1/2 C. -x/(x^2+1)^1/2 D. -x/(x^2+1)^3/2 E. x/(x^2+1) I got B.

**Calculus check**

If f(x)=sin^2(3-x) then f'(0)= A. -2cos3 B. -2sin3cos3 C. 6cos3 D. 2sin3cos3 E. 6sin3cos3 I got B

**Civics**

I should of known that answer a little bit earlier! But whatever.

**Civics**

The answer is D. I chose C and got it wrong.

**Civics**

12. Which one of the following statements is most accurate regarding the Mayflower Compact? A. It made Plymouth a royal colony. B. It created the Massachusetts Bay Colony. C. It founded the Plymouth colony under a proprietary governor...

**MATHS**

Please help - In a stationery shop, there were pens, erasers and rulers. There were thrice as many pens as erasers and thrice as many erasers as rulers at first.After the shop keeper sold 6 rulers and some erasers there were thrice as many pens as erasers but 4 times as many ...

**maths**

Need help on this, Please : there was a total of 1134 durians, papayas and apples in a basket. when 25% of the durians and 96 papayas were taken out and 252 more apples were put in basket, there were an equal number of the three types of fruits, How many of each type of fruit ...

**To Ms.Sue**

I MEANT FOR TOMORROW'S EXAM GEEZ, A STUDY GUIDE!😧

**To Ms.Sue**

Ms.Sue please check civics for me,it's the last of today!

**Civics**

This is a study guide for me not the final exam. I am just so used to saying exam and not study guide or whatever,jeeeeeeez.

**Civics**

How can I trust you and go with what you say this is an exam and I need someone to correct me and help me out. I like that Ms.Sue always helps me and corrects me wonder where she is? But thanks for the help it's appreciated :)

**Civics**

What about 17 and 20?

**Civics**

20. In 1775, the population of the colonies included about _______ African slaves. A. 100,000,000 B. 100,000 C. 500,000 D. 50,000 C?

**Civics**

19. In general terms, the heart of any representative democracy is A. the Senate. B. Congress. C. suffrage. D. a legislature. D?

**Civics**

18. The largest social class in Egypt or ancient Rome was made up of A. soldiers. B. farmers. C. artisans. D. traders. B?

**Civics**

17. After General Howe's forces defeated the Americans at Brooklyn Heights and White Plains, Washington's strategy called for A. drawing British forces inland. B. retreating to the south. C. surrounding the British and forcing them into...

**Civics**

16. Which one of these terms is most closely related to an oligarchy? A. Constitutional monarchy B. Junta C. Democracy D. Roi Soleil B?

**math**

i like math

**Civics**

Thanks:) 15. Suppose you work for a government agency that regulates the buying and selling in the country. Which main purpose of government is your agency serving? A. Organizing work for common goals B. Settling disputes C. Distribution of resources...

**Civics**

14. What did Plato critique in his book The Republic? A. Democracy B. Isolationism C. Socialism D. Communism ??? Am not 100% sure with this question.

**Civics**

13. Under the reign of Louis XIV, the government in France was a/an A. absolute monarchy. B. representative democracy. C. dictatorship. D. direct democracy. A?

**Civics**

"The compact remained in effect until Plymouth was incorporated into the short-lived Dominion of New England in 1686 and subsequently absorbed into the Massachusetts Bay Colony in 1691." I read the page and found this,which made me think B.

**Civics**

Which one of the following statements is most accurate regarding the Mayflower Compact? A. It made Plymouth a royal colony. B. It created the Massachusetts Bay Colony. C. It founded the Plymouth colony under a proprietary governor. D. It ...

**physics**

12km

**Civics**

11. The purpose of the petition sent to King George III by the First Continental Congress was to A. request a place in Parliament for colonial delegates. B. request that the king consider granting independence to the established colonies. C. ...

**To Ms.Sue**

Ms.Sue can you check my questions and answers down below for Civics if you can.

**Civics**

Regarding the Magna Carta, which statement is false? A. King John was forced to sign the document. B. The document assured all English citizens freedom of speech. C. The document required trial by a jury of one's peers. D. The meeting of the ...

**Civics**

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

**Civics**

Just making sure I was correct. Thanks :)

**Civics**

8. Which one of the following provisions was part of the first draft of the Articles of Confederation submitted to the Second Continental Congress? A. Appointment of George Washington as commander of the Continental Army B. Limited and restricted ...

**physics**

A car's wheel of radius r=50cm goes through 5000rev in 1min. find the car's average angular velocity,and how far it travels along the ground in 1min. The linear speed v and angular speed w of the point of a rotating body are connected by the equation v=wr. where r is ...

**Civics**

Oops that was supposed to be a period.

**Civics**

8. Which one of the following provisions was part of the first draft of the Articles of Confederation submitted to the Second Continental Congress? A. Appointment of George Washington as commander of the Continental Army B. Limited and restricted ...

**Math**

2+5=7 24/3=8

**Civics**

B?

**Civics**

8. Which one of the following provisions was part of the first draft of the Articles of Confederation submitted to the Second Continental Congress? A. Appointment of George Washington as commander of the Continental Army B. Limited and restricted ...

**math**

you are making a rectangular table. The area of the table should be 10 ft^2. You want the length of the table to be 1 ft shorter than twice its width. What should the dimensions of the table be? This question has to be quadratic equation! I really need to know the answer, ...

**Civics**

7. If you came to settle on present-day New York City in about 1650, it's most likely that you're of _______ descent. A. French B. Swedish C. Spanish D. Dutch D?

**to writeacher**

I think it is C,please check civics on the thread down below.

**English Help Please**

^^^^^^^ 100% Right

**Civics**

I think c?

**Civics**

Concerned about the Catholic minority in Maryland, Leonard Calvert ordered the Second Lord Baltimore to A. send to Europe for more Catholic priests. B. encourage members of the Church of England to become Catholics. C. make a law ...

**Civics**

Thanks

**Civics**

5. The United States Constitution delegates police powers mainly to A. state and local authorities. B. the president of the United States. C. Congress. D. the National Guard. A?

**chemistry - PLEASE HELP**

Spectroscopic studies have shown that the fusion reaction in the sun's core proceeds by a complicated mechanism. One proposed overall equation for the solar fusion reaction is 411H+2 0−1e→42He which is also accompanied by the release of "massless" ...

**physics**

so how much is the radius

**physics**

can you make it more clear the answer

**physics**

calculate how far along the ground would the bicycle move if one of the wheels had an angular displacement magnitude of 500rev

**Finance**

The manager for a growing firm is considering the launch of a new product. If the product goes directly to market, there is a 40 percent chance of success. For $171,000, the manager can conduct a focus group that will increase the product’s chance of success to 55 percent...

**Finance**

We are evaluating a project that costs $670,000, has a five-year life, and has no salvage value. Assume that depreciation is straight-line to zero over the life of the project. Sales are projected at 59,000 units per year. Price per unit is $44, variable cost per unit is $24, ...

**Finance**

We are evaluating a project that costs $1,120,000, has a ten-year life, and has no salvage value. Assume that depreciation is straight-line to zero over the life of the project. Sales are projected at 64,000 units per year. Price per unit is $50, variable cost per unit is $25...

**Finance**

You have been hired as a consultant for Pristine Urban-Tech Zither, Inc. (PUTZ), manufacturers of fine zithers. The market for zithers is growing quickly. The company bought some land three years ago for $1.42 million in anticipation of using it as a toxic waste dump site but ...

**Finance**

Aria Acoustics, Inc. (AAI), projects unit sales for a new seven-octave voice emulation implant as follows: Year Unit Sales 1 87,000 2 100,000 3 114,000 4 109,000 5 90,000 Production of the implants will require $1,660,000 in net working capital to start and additional net ...

**Civics**

4. The term suffrage refers to the A. freedom to make one's voice heard. B. Soviet labor camps. C. right to vote. D. extermination of Jews under Hitler. C?

**Civics**

2. Imagine that you're a member of the Virginia House of Burgesses. You've submitted a proposal for a law that requires colonial inspectors to place grades on different qualities of harvested tobacco. The law passes, but you know it won't go into effect...

**Civics**

1. The German leader who headed the Nazi party was A. Hitler. B. Idi Amin. C. Perón. D. Stalin. A?

**physics**

A 4 cm candle sits 15 cm in front of a converging lens with a focal length of 6.0 cm. Draw a ray diagram showing the image used and determine the image distance and magnification. Please help me answer!

**Algebraic expression**

Translate 7 more than one-third of a number into an algebraic expression

**Earth Science**

Is #3 correct?

**Earth Science**

Oh its silicates just found the answer in my book must of missed a page!

**Earth Science**

Ms.Sue is it possible if you give me a website for number two or no?

**Earth Science**

3. An explosion that destroys the outer portion of a star is known as a A. supergiant. B. protostar. C. nebula. D. supernova. D?

**Earth Science**

2. The Moon is made up of minerals similar to those on Earth, which are A. rilles. B. lunar breccias. C. silicates. D. highlands. I am thinking either B or D?

**English**

thanks again :)

**English**

thank you so much, yes it was very helpful :)

**English**

Can someone please explain this poem to me and also the literary devices used? Thanks! "Like This" If anyone asks you how the perfect satisfaction of all our sexual wanting will look, lift your face and say, Like this. When someone mentions the gracefulness of the ...

**Chemistry**

Alright so I got 4.92 and then 12 x 1 = 12 so now how do I get my separation distance?

**Chemistry**

A pharmaceutical chemist Runs a chromatography test on a substance and identifies two of its components by comparing their RF values against certain standards . if the two components have RF values of 1.0 and 0.41 and the solvent front has traveled 12.0 cm from the samples ...

**Earth Science to Ms.Sue (urgent )**

Yes the answer was B.thanks

**Earth Science to Ms.Sue (urgent )**

Thanks Ms.Sue and Damon.

**Earth Science to Ms.Sue (urgent )**

18. The Cenozoic Era is also referred to as the A. Age of Dinosaurs. B. Age of Mammals. C. Age of Fish. D. First Era. B???

**Chemistry 101**

Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.9g .What minimum mass of H2SO4 would you need? What mass of H2 gas would be produced by ...

**Earth Science to Ms.Sue**

9. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. stromatolites. D. prokaryotes. D?

**please check Ms.Sue**

You were right.

**Reed**

Thanks I will go with this answer and tell you if it was right.☺

**please check Ms.Sue**

4. Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today. A. oxygen B. lead C. hydrogen D. ore A? Reed told me yes for A,but I still was not sure!

**Chemistry**

1.Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine). The unbalanced equation is NaCl(aq) + H2O(ℓ) → NaOH(aq) + Cl2(g) + H2(g). If the brine contains 163 g of NaCl, how much Cl2 can be...

**physics**

In an arcade game, a 0.18 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 237 N/m and is compressed from its equilibrium position by 6.6 cm, what is the magnitude of the ...

**Wrld Hist**

To what extent did the French Revolution represent a tangible political expression of Enlightenment ideals?

**Earth Science**

4. Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today. A. oxygen B. lead C. hydrogen D. ore A?