# Posts by liz

Total # Posts: 1,333

**physics**

a uniform meter stick is balanced at its midpoint with a single support. a 50 N weight is suspended at the 30 cm mark. at what point must a 20 N weight be hung to balance the system

**physics**

a person weights 550 N rides a bike. the pedals move in a circle of radius 30 cm. if the entire wt acts on each downward moving pedal, what is maximum torque

**physical science**

A 136-lb. student races up stairs with a vertical height of 4.8 m in 6.0 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity?

**physical science**

What is the kinetic energy of a 29 kg dog that is running at a speed of 8.8 m/s (about 20 mi/h)?

**physical science**

How much work does gravity do on a 0.140-kg ball falling from a height of 14.0 m? (neglect air resistance)

**Physical science**

A man pushes a lawn mower on a level lawn with a force of 192 N. If 50% of this force is directed downward, how much work is done by the man pushing the mower 7.3 m?

**Physical science**

A 6.2 "kil" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.31 m. above the counter?

**Computers**

The Romance World Cruise Line provides special gifts for passengers who are newlyweds, as well as for those who have been married more than 40 years. Design a pseudocode for a program that accepts a couple's last name, ship cabin number, and number of years married. ...

**Algebra**

What the general term a_n for the geometric sequence a_1= -5 and a_2= 15

**Math**

which is the easies,t Arithmetic Series or a Geometric Series? and why?

**earth**

The radius of the Earth is approximately 6370 km. If one could dig down straight towards the center of the Earth, one would find that the outermost 2890 km (the crust and the mantle) has an average density of about 4.5 g/cm3. Farther down is the core. If the average density of...

**Algebra**

How is a quadratic inequality different from a quadratic equation?

**Algebra**

please help me on how to complete the table and evaluate f(x) x=0, x=1, x=2, x=3, x=4 f(x)7/x-1 my answers were -7 for x=0 7/0 for x=1 7 for x=2 7/2 when divided 3.5 ?? for x=3 7/3 when divided 2.3 ?? for x=4 I am not sure if this is correct.. please HELP ME..!

**health**

#same

**Algebra II**

Please help! I am stuck on this one. Need to simplify the expression. Assuming all variables are real numbers. ∛(27(x+2)^3) my answer =3x+6 not sure is this is correct.

**Algebra II**

thank you :)

**Algebra II**

simplify by factoring ã90 is this correct? ^3ã10

**Algebra**

please help. I am not sure if this is correct. I need to simplify this to the lowest terms a^2 - 4b ^2 _____ ______ a+2b a+2b my answer is: a^2-4b^2 _________ a+2b is this really to the lowest term?? for some reason I think I am doing this wrong. Thank you!

**Algebra 1B**

Thank you so much! Now I undersand .. :)

**Algebra 1B**

Please help I am so confused... Question: supposed that y is directly proportional to x. a) use the given info to find constant of proportionally k. b) then use y=kx to find y for x=6 y= -62 when x=5 Please help.. thank you this is all I have so far. not sure if I am correct. ...

**chem**

What volume in liters is occupied by 8.22 g of SO2 gas confined at a pressure of 1200.8 torr at 75.0*c?

**chem**

A 5.00 liter sample of gas measured at 27.0*C and 1.25 atm presure has a mass of 10.13 g. What is the formula weight of the gas?

**chem**

Calculate the formula wright of a 2.50 g sample of gas whose volume is 1.40l at STP.

**CHEM**

A GAS TAKES UP 25.2 L AT 25*C. AT 25*c THE GAS CAN ALSO TAKE UP 12.2lAT 1520 TORR. WHAT WAS THE PRESSURE IN ATM, OF THE ORIGINAL SAMPLE? I GOT 4.1S ATM. IS THAT RIGHT?

**CHEM**

yes, by adding 273.15 right?

**CHEM**

IF A SAMPLE OF GASE HAVE A VOLUME OF 8.20 L AT 25*C AND 2.00 ATM, HOW MUCH VOLUME WILL IT TAKE UP IF YOU DECREASE THE PRESSURE TO 1.50 ATM AND INCREASE THE TEMPERATURE TO 100*C?

**Algebra**

Is it possible to factor a sum of two squares by using real numbers?

**Us History**

The Treaty of Versailles, explain what it was and why the United States refused to sign it. Predict how the missing signature of the United States might affect Europe in the future.

**Calc**

Not a fraction, so 331.7 thank you!!

**Calc**

The U.S. population is approximated by the function P(t) = 556 1 + 3.72e−0.5t where P(t) is measured in millions of people and t is measured in 30-year intervals, with t = 0 corresponding to 1930. What is the expected population of the United States in 2020 (t = 3)? (...

**psychology**

how effective is classical conditioning in the long tem

**economics**

Why might management and economic theories not always work in the real world?

**economics**

A copy company wants to expand production. It currently has 20 workers who share eight copiers. Two months ago, the firm added two copiers, and output increased by 100,000 pages per day. One month ago, they added five workers, and productivity also increased by 50,000 pages ...

**Math**

Joe drank 4 liters of water on Monday and 4 deciliters of water on Tuesday. How much more water did he drink on Monday than on Tuesday?

**Calculus**

Find if the limit exists. lim tan(x)/x x->0 Please show how you determined this. Thanks!

**Calculus**

Find an equation of the line that is tangent to the graph of f and parallel to the given line. Funtion: f(x)=1/sqrt(x-1) Line: x+2y+7=0

**Calculus**

**Note** Please use the Epsilon-Delta Definition.

**Calculus**

I have two similar problems that I need help completing. Please show all your work. Question: Find the limit L. Then use the å-ä definition to prove the limit is L. 1. lim (2x+5) x->3 2. lim 3 x->6 Thank you for your anticipated help!!

**Algrebra 1**

What are the practical uses of scientific notation? Why is scientific notation so important in modern-day society?

**english**

They are going to the park and play or they are going to the park to play. Which one is correct.

**english**

There are never enough discipline on the playground: someone always is getting hurt. Subject verb agreement.

**Grammar**

Everything looks good except #3, it is supposed to be Was.

**reading**

You don't want to put your the title of the essay in the introduction. An introduction has to have a grabber, thesis statment and also an idea of what we'll be reading. Sometimes that idea is part of th egrabber and that makes it stronger. People would want to read it...

**reading**

It looks like there are supposed to be choices. maybe if you put the choices down we'll help.

**Chemistry (1Question)**

This is really confusing. I know how to do the equilibrium which also has to do with reaction rates but they didb't give it to me as a choice. Please Please help me. I post other questions that i answered already but no one answered me. I just needed someone to check them ...

**To DrBob222(Please check Chem)**

#4 is the last choice for sure. I googled exothermics and i even found examples. #'s 12 and 14 look wrong to me also but those are the only choices i got.

**To DrBob222(Please check Chem)**

(This homework question has been removed due to a copyright claim submitted by K12 Inc.)

**Algebra(please help)**

Will someone please help me withthis question I couldn't solve it. What is the length of the segment whose endpoints are A(2, 3) and B(10, 7)? a)2 Sqrroot29 b)2 Sqrroot41 c)4 Sqrroot2 d)2 Sqrroot5

**Calculus**

Find the volume of the solid generated by the region in the first quadrant bounded above by the 3x+y=6, below by the x-axis, and on the left by the y-axis, about the line x= -2.

**chemistry**

The data in the table show the amount of a 500 g sample of sodium-24 over time. Make a graph of the data (remember to label all axes and title the graph). What is the half-life of sodium-24? Explain how you determined your answer. Sodium-24 decays by beta emission. Write a ...

**English (quick Sentence)**

Thanks. I forgot the comma ansd i used tha present tense when it is supposed to be the past tense.

**English (quick Sentence)**

Hi Teachers, I wrote a sentence in which i think has a wrong sentence structure. Will you correct me with it, please? When his daughter told us of what he said we promised that we will all be in part of helping him and making him feel like family.

**Comm 215**

Part1 looks good to me. I have to go:( I hope you get help with the rest.

**English**

It would be at the end of the cited work.

**English (Check Please)**

Hi Teachers, will you please check my answers? The arrows indicate my answers. Am I right? 1. The speaker’s use of many exclamation points and imperative statements in “Beat! Beat! Drums!” helps readers feel the tone’s humor. urgency. <--- quiet calm. ...

**English**

Type this question in bing and when the results come up it is the first one. very helpful paper, trust me! Where would i put a parenthetical citation for a work that needs to be credited? This is what you should press on. Parenthetical (in-text) Documentation (citation)

**English (Check)**

Thank you again Ms. Sue.

**English (Check)**

Thank you so much for your help Ms. Sue. I had already told my sister that i think it is abundance and energy because in thos lines it talks about the coolness and sweetness of Ohio. It also talks about the flutering leaves in a moderate wind. She thought i was wrong. Thank ...

**English (Check)**

Would it be suffering and loss? I'm just confused by this question.

**English (Check)**

I'm sorry i forgot to tell you that the arrows means indicate my answers. Am i correct?

**English (Check)**

Hi Teachers, will you please check my answers? 1. The speaker’s use of many exclamation points and imperative statements in “Beat! Beat! Drums!” helps readers feel the tone’s humor. urgency. <--- quiet calm. high spirits. 2. With what kind of life are ...

**Religion**

Hi Rebecca, I am a Muslim and Islam promotes peace. May i ask, what made you ask this question?

**Calculus**

Find the volume of the solid of revolution by roating the region R about the y-axis. Write the answer as a multiple of pi. y= sqrt(x), y=x^2, in the first Quadrant

**Chemistry**

In a calorimeter, 100 g of ice melts at 0oC. The enthalpy of fusion of the ice is 334 J/g. How much heat was absorbed? 33.4 J 334 J 33.4 kJ 334 kJ

**English ASAP**

I have to choose the sentence that has no error in italics. (Italicized) a)Their lawyers are handling the case pro bono and not charging them a dime. b)Yes, of course you can use (and) instead of a comma here. c)Oh, I see the problem; this (three) should be an (eight) <-- I...

**chemistry**

a student determines the molar mass of methanol by the method used in this experiment. she found that the equilibrium temperature of a mixture of ice and pure water was .4 degrees Celsius on her thermometer. when she added 10g of her sample to the mixture, the temperature, ...

**Calculus**

A container is in the shape of an inverted right circular cone has a radius of 2 in at the top and a height of 6 in. At the instant when the water in the conatiner is 5 in deep, the surface level is falling at the rate of -.4 in/s. Find the rate at which the water is being ...

**Calculus**

Find the third Derivative of f(x)=x(3x-7)^3 The answer is 3x-1134 but I attempted the problem multiple times and I keep ending up with 648x-1134. What am I doing wrong?

**Algebra2 {ASAP}**

Hi helper, I used permutation for the following question. How can i use combination to find the answer? Help me please! There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is ...

**social studies 9**

Wouldn't this be reading or Literature? I think that Dickens gave him his name because he looks a bit chubby and is short. More like a bumble bee with a fat stomach. It is just a good guess and that is how i visulized him whem i read Oliver Twist by Charles Dickens.

**Algebra**

thank you! u r awesome... I wasn't too sure.. again thank you!

**Algebra**

Use the formula d=rt to find the value of the missing variable d=42 feet, t=14 seconds then r= ft. second

**MAT 116 (algebra)**

Please help not understanding this question. If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a cost decrease of four times? Make up your own numbers in an example and then explain your answer as though you were talking to ...

**8 th grade**

Good job.

**English**

The styles are different. The “ Theme for English B” is a free style and the “Ballad of Birmingham' has rhythm. The rhythm he uses is ABCB, ABCB and so on. The themes for both the “Theme for English B” and “Ballad of Birmingham” are civil...

**English**

Well i understand that the style for “Theme for English B" is a free style. I don't know what style a “Ballad of Birmingham” uses. I know that it is something like ABCB but i don't know what the name is for it. I'm thinking that the theme for ...

**English**

How do the styles and themes of “Theme for English B” and “Ballad of Birmingham” compare? Answer this question in at least a paragraph and make sure to cite examples from the text. Answer:

**chemistry**

Given the consentration of either hrgrogen ion or hydroxide ion, use the product constant of water to calculate the consentration of the other ion at 298 K. A: [H+]=1.0x10^-4M B: [OH-]= 1.3x10^-11M

**Chemistry**

If a total of 13.5 mol of NaHCO3 and 4.5 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced? 3NaHCO3(aq) + C6H8O7(aq) > 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq)

**Calculus**

The strength of a beam with rectangular corss-section is directly proportional to the product of the width and the square of the depth (thickness from the top to bottom of the beam). Find the shape of the strongest beam that can be cut from a cylindrical log of diameter d= 3 ft

**Physics**

Thank you!!

**Physics**

The total charge in an electrical circuit as a function of time is given by q=t/t^2+1 coulombs. Find the maximum charge q. Please provide your reasoning.

**Algebra 1**

3x + 4y = -2 and 2x - 3y = 10

**chemistry**

Calculate the pH of a 2.5x10-5 M lithium hydroxide solution.

**Chemistry-Help**

An AM radio station broadcasts at 1060 kHz. Calculate the wavelength of the corresponding radio waves. How do I calculate this?

**Algebra**

3. There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in 10 selections. Show your work. Help! I'm ...

**chemistry**

1.16 x 10^22 sulfur atoms

**chemistry**

73.7g

**chemistry**

how many sulfur atoms are in 2.57 g of iron (III) sulfate?

**chemistry**

how many grams of magnesium carbonate are in a sample that has 1.58 x 10^24 oxygen atoms?

**AP Chemistry**

What is the pH of a .20M HA solution (Ka=1.0x10^-6) that contains a 0.40M NaA?

**chemistry**

What would the pressure be if h3 po4 was vaporized in a 20L container at a temperature of 23.5 degrees Celsius?? ( gas law)

**Math**

oops I meant length of AB

**Math**

An electric circuit has equally spaced parallel wire with connections A, B, and C. If the length of AP = 3.42 cm, what is the length of BC?

**Calculus**

Please help!! I keep solving this problem but I keep getting the wrong answer. Find the derivative of the function: f(x)= xsqrt(x-1)/(x+2)

**Calculus**

A electric circuit board has equally spaced parallel wires with connections at points A, B, C. If the length of AB=3.42 cm, what is the length of BC?

**Native American Studies**

OR d) All of the answers are correct

**Native American Studies**

a) Using a sacred site to store toxic waste b) Barring development on a sacred site c) Passing federal legislation to return sacred sites to Native American control All of the answers are correct

**Native American Studies**

Which of the practices listed is an example of an activity Native American people might regard as an act of desecration?

**Calculus**

Please help!! Differentiate: y=(x^2-1)^(1/2)/x^2