# Posts by mark

Total # Posts: 1,608

**Physics**

An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?

*November 19, 2012*

**Physics**

An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?

*November 18, 2012*

**math**

A mother wnats to invest $6,000 for her son's future education. She invests a portion of the money in a bank certificate of deposit which earns 4% and the remaainder is a savings bond that earns 7%. If the total interest earned after one year is $360.00, how much money was...

*November 17, 2012*

**English**

Hello! Any interesting ideas on how to present new vocabulary? The topic is smoking. Some of the words are:addicted,to promise,to give up and so on. There are 10 unknown words. What to do? :/ There are 22 students (17 years old) and they are learning English for only 3 years

*November 17, 2012*

**Physics**

A circular disk of radius 30 cm is rotating with an angular velocity of 2 radians / s. What is the tangential velocity of a point on the rim of the disk? What is its centripetal acceleration?

*November 17, 2012*

**Physics**

A 980 kg car traveling at 20 m/s rounds a curve of radius 40 m. What is the friction force that must act on the car to keep it in its circular path?

*November 16, 2012*

**English**

Hello! How to present smoking as a topic to students? There are 22 students (17 year olds) and they are learning English for 3 years.So any kind of discussion has to be excluded. I would really like to come up with something interesting! At the end of the lesson I am going to ...

*November 16, 2012*

**Physics**

A 3 kg ball is traveling in a circle of radius 2 meters with a tangential velocity of 2 meters/second. Find the centripetal acceleration of the ball and the centripetal force acting on it.

*November 14, 2012*

**math problem**

--There is a layer of ice four inches thick covering a small pond when the weather arrives and it begins to smelt. It smelts 1/16 inch the first day, 1/8 inch the second day. 1/4 inch the third day, and keeps doubling the amount melted each succeeding day. all the ice will be ...

*November 11, 2012*

**Physics**

A 500 kg cannon rests on wheels that are free to roll. The cannon fires a 2 kg cannon ball horizontally with an average force of 400 N. What is the acceleration of the cannon ball? What is the recoil acceleration of the cannon

*November 9, 2012*

**Geometry**

BC has endpoints B(5,9) and C(-4,-3). Find the coordinates of the midpoint of BC.

*November 6, 2012*

**Psychology**

Why did early Psychologists NOT focus on "the mind" it was too complex it was genetically determined it was largely unconscious it was unobservable it was environmentally determined

*November 5, 2012*

**Psychology**

In order to treat a specific phobia, this therapy would be best Antidepressant drugs Systematic desensitization Implosion therapy Psychoanalysis Aversion therapy

*November 5, 2012*

**English**

We express our love for each other by exchanging gifts. (for each other) Is that a prepositional phrase? What is (by exchanging gifts)

*November 1, 2012*

**Math**

Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 5 times. Is that correct?

*October 23, 2012*

**Math**

Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 5 times. Is that correct?

*October 23, 2012*

**Math**

Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 9 times. Is that correct?

*October 23, 2012*

**math**

Malia runs twice as fast as Eileen. If Malia and Eileen start from the same point and run around a circular track in opposite directions, how many times will they pass each other if they stop when Malia completes her sixth lap? I figured 9 times. Is that correct?

*October 23, 2012*

**Math**

Need Help!! Find the measure of the small angle between the hands of a clock at 8:16 a.m. I keep getting different answers

*October 23, 2012*

**math**

reduce 16/180 to lowest terms

*October 16, 2012*

**maths**

find volume and curved surface area of a cone of radius 6.00cm and perpendicular height 8.00cm

*October 16, 2012*

**chemistry**

the level of water in a graduated cylinder is 52.7 ml. After a solid object weighing 100 g is added, the level is 87.4 ml. What is the density of this object?

*October 14, 2012*

**Econ**

I have spent a few hours on this question. Can anyone help? The demand for Healthy Wheat Cookies is downward sloping, while the supply is upward sloping. Healthy Wheat Cookies are a normal good produced mainly from wheat and sugar. The government recently put a price floor on ...

*October 13, 2012*

**English**

Seals balance balls on their noses on command. Is command the object of the prep. on

*October 10, 2012*

**Physics**

A freight train has a mass of 1.5*10^7 kg. If the locomotive can exert constant pull of 4.5 *10^5N, how long does it take to increase the speed of the train from res to 80.0km/hr? a)467s b) 444s c)527s d) 425s e) 496s

*October 9, 2012*

**Math**

4)7(:!$4!4$3' wniqnejduenepehurjrnirjeoqlgw5,🙁😯😪😢😓😷💩💩💩💩💩💩💩💩💩💩👺👹👹🤕😵😢😫😕🙁&#...

*October 8, 2012*

**Physics**

A typical laboratory centrifuge rotates at 4100 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations. (a) What is the acceleration at the end of a test tube that is 11 cm from the axis of rotation? dropped from a height of ...

*October 7, 2012*

**Chemistry**

When investigating heat of solution of NaoH& NH4No3, what is the heat of solution of the two cpds?

*October 6, 2012*

**English**

There is a control on the television set for making the picture a little less brighter. Is the sentence correct or is it a little less bright

*October 4, 2012*

**English**

We found it hard to understand why Randy had spoken as rude as he did in response to a simple question. is rude correct or is it rudely and why

*October 4, 2012*

**Eglish**

Thanks Ms. Sue

*October 2, 2012*

**English**

Why is she walking so slow toward the house? Is that correct or should it be (so slowly} They both sound correct

*October 2, 2012*

**English**

Dividing the pie into, Felicia took the least and gave me the larger portion. Is least correct or should it be lesser? It doesn"t sound right with lesser.

*October 2, 2012*

**Math**

Two sides of a triangle measure 14 and 10. If A is the set of possible lengths for the third side, how many elements of A are integers? Is the correct answer 19 elements of A are integers?

*October 1, 2012*

**Math**

Two sides of a triangle measure 14 and 10. If A is the set of possible lengths for the third side, how many elements of A are integers? Is the correct answer 19 elements of A are integers?

*October 1, 2012*

**chemistry**

how much E is used to heat 500g of iron from 22c to 55c? Cfe=0.451 Jg-1C-1.

*October 1, 2012*

**Physics**

v^2=2W/(m1+m2)

*September 30, 2012*

**Math**

3. $34,600

*September 30, 2012*

**English**

Thank You, Ms. Sue I understand it better now

*September 29, 2012*

**English**

Limburg cheese smells very (bad, badly). Is the correct answer bad because it modifies cheese? "The leading lady in the play," she said, "is feelin (sick, sickly)." Is the correct anwer sickly because it modifies is feeling?

*September 29, 2012*

**English**

"She is resting ( comfortable, comfortably) backstage." Is the correct answer comfortably even if it follows the linking verb is

*September 29, 2012*

**French**

Thank you SraJMcGin. Your explanations are very helpful.

*September 29, 2012*

**French**

Are my answers correct? 1 Elle voit le film au cinéma. Elle _____ voit. le-my choice lui pour me 2 Nous parlons souvent à nos professeurs. Nous _____ parlons souvent. les leur-my choice y en 3 Elle va en Chine. Elle ____ va pour étudier la culture. lui y-...

*September 29, 2012*

**physics**

Let the radius of the circular segment be 92 m, the mass of the car 2393 kg, and the coefficient of the static friction between the road and the tire 0.9. Find the magnitude of the normal force N which the road exerts on the car at the opti- mal speed (the speed at which the ...

*September 29, 2012*

**Math**

Factor. y ^3 + 729

*September 28, 2012*

**Math HELPPPP**

(a) Which of the following are examples of the expression "difference of two cubes"? (Select all that apply.) (y2 - 9)3 3 - 4y 64 - y3 (y - 1)3 y3 - 27 27 - 3y y3 (b) Which of the following are examples of the expression "cube of a difference"? (Select all ...

*September 28, 2012*

**Math**

Before a football game, a coin toss is used to determine which team will kick off. The height h (in feet) of a coin above the ground t seconds after being flipped up into the air is given by the following equation. h = -16t2 + 34t + 15. How long does a team captain have to ...

*September 28, 2012*

**Math**

At the peak of a roller coaster ride, a rider's sunglasses fly off his head. The height h (in feet) of the glasses, t seconds after he loses them, is given by h = -16t2 + 16t + 1152. After how many seconds will the glasses hit the ground?

*September 28, 2012*

**Math**

The inclined ramp of the boat launch is 18 meters longer than the rise of the ramp. The run is 17 meters longer than the rise. How long are the three sides of the ramp?

*September 28, 2012*

**physics**

.A 5.5kg riffle fires an 11gram bullet with a velocity of 1000m/s. a. find the velocity of a riffle? b. if the shooter holds the riffle firmly with his shoulder what will be the velocity assume the mass of shooter is 120kg?

*September 28, 2012*

**Senior Microeconomics**

I need some help with my econ homework. Can someone tell me if I am right on these? 1. When graphing cross-sectional data, one should ________. A. place the various years on the X-axis B.always be drawn using a line chart C. investigate variables in a single time period D. ...

*September 27, 2012*

**marketing**

Binomial probability distributions are used in business, science, engineering, and other fields. Suppose you work for a marketing agency and have to create a television ad for Brand A toothpaste. The toothpaste manufacturer claims that 40% of the toothpaste buyers prefer Brand...

*September 27, 2012*

**business**

Previous billing method

*September 26, 2012*

**algebra II**

Choose the equation in slope-intercept form for the line passing through each pair of points. (-4, -2) and (2, 3) y=-5/6x+14/3, or y=5/6x+4/3

*September 25, 2012*

**math**

i have 0.953 and need to round it off round two decimal places. Would this be consider 0.9

*September 25, 2012*

**Math**

What is the area of a square with the same perimeter as a regular hexagon with area 24 square root of 3. Can you please help me wodrk this?

*September 19, 2012*

**Math**

solve the ivp dy/dx = 1/(sqrt(1-x^2)) with initial condition y(sqrt(3)/2)=0

*September 19, 2012*

**physics**

A top fuel dragster covers the quarter mile in 4.5 seconds. what is its speed in miles per hour? please tell me step by step what to do.

*September 18, 2012*

**math**

Laura is a salesperson in a retail store and earns $65 per week plus 10% of her weekly sales. If Laura earned $200 one week, what were her sales that week

*September 18, 2012*

**Physics**

72.7889

*September 17, 2012*

**English**

Also, we thought wrongly that (she, her) sitting in for him would decrease our work load. Is the correct answer ( her )

*September 13, 2012*

**ALGEBRA**

Solve 10x + 75 = 150. Round your answer to the nearest hundredth. A. x ¡Ö 1.63 B. x ¡Ö 1.56 C. x ¡Ö 1.75 D. x ¡Ö 1.88

*September 13, 2012*

**Math**

Pages in a book are numbered in typical fashion, starting with !. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur?

*September 11, 2012*

**Math**

Pages in a book are numbered in typical fashion, starting with !. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur? Can you help

*September 11, 2012*

**Pizzazz**

Theyfasineight

*September 10, 2012*

**English**

It could be (they, them) across the street. Is it they because it is used as a predicate nominative

*September 10, 2012*

**English**

The boss relies on (we, us) workers. Think it is us because us is the object of the prep. but then what is workers.

*September 10, 2012*

**physics**

Assume that a small sugar cube has sides 1 cm long. If you had a box containing 1 mol of cubes and lined them up side by side, how long would the line be (1 mol = 6.02 x 10^23)?

*September 7, 2012*

**physics**

A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. After flying through the air, the ball lands with a velocity of m/s at an angle of degrees above the x-axis

*September 7, 2012*

**physics**

A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the velocity of the ball at its maximum height?

*September 7, 2012*

**physics**

A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the initial velocity in the y-direction? Two sigfigs Remember...no units...but it would be in m/s

*September 7, 2012*

**physics**

A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the initial velocity in the x-direction? Two sigfigs Remember...no units...but it would be in m/s

*September 7, 2012*

**Math**

Pages in a book are numbered in typical fashion, starting with 1. The folio for page 10 will contain the tenth and eleventh digits necessary to paginate the book. On what page will the 2009th digit occur?

*September 6, 2012*

**algebra**

Find g of f if f(x) = x + 7 and g(x) = 3x – 2.

*August 31, 2012*

**Math**

13xy(x+y)

*August 24, 2012*

**stat/ probability**

The height of males is normally distributed with a mean of 69 inches and a standard deviation of 2.5 inches. What is the probability that the height of a randomly selected male is between 66 and 71 inches?

*August 15, 2012*

**College Chem**

How many molecules of CH3OH will contain 3.20 x 10^23 H atoms?

*July 16, 2012*

**College Chem**

A mixture containing 5.0 g of H2 and 10.0g of O 2 is allowed to react in a 15.0L container at a constant temperature of 25.0 C. Once the reaction is complete, what will be the pressure of the excess gas inside the container?

*July 16, 2012*

**Chem**

DrBob222 - You're the greatest!!!! Thank you!

*July 16, 2012*

**Chem**

A mixture containing 5.0 g of H2 and 10.0g of O 2 is allowed to react in a 15.0L container at a constant temperature of 25.0 C. Once the reaction is complete, what will be the pressure of the excess gas inside the container?

*July 16, 2012*

**Statistic**

A training center claims that 75% of people taking national exam on achievement. In a sample of 90 people who took the exam only 39 have passed the exam. Use hypothesis testing to determine whether the training center claim is justified. Use 5% level of Significance

*July 9, 2012*

**math**

Multiply using Lattice Multiplication 23 x 45 379 x 24 379 x 450 Multiply by using the Russian Peasant Method 27 x 79 38 x 126

*June 27, 2012*

**math**

a recreation has the following dimensions. 15ft,33ft, 12ft, and 12ft. Carpeting will cost $ 1.50 per square foot. How many square feet of carpet will be needed and how much will it cost. Include correct units in each solution.

*June 26, 2012*

**U.S. GOVERNMENT**

All is correct but #5

*June 25, 2012*

**Calculus**

Given f(x)=x2+3x-5 on [-1,3] show f(x)= 10 without solving for x

*June 11, 2012*

**Math**

Given f9x0=x2=3x-5 on {-1,3} show f(x)= 10 without solving for x

*June 11, 2012*

**business**

thank you

*June 6, 2012*

**business**

I think ( a) is the answer, could you plz confirm

*June 6, 2012*

**business**

if you're developing a human resource inventory, you should exclude which of the following? a. names b. capabilities c. perpetual inventory d. education

*June 6, 2012*

**business**

thank you

*June 6, 2012*

**business**

is it B ??

*June 6, 2012*

**business**

its a gain regulated or conducted by oneself

*June 6, 2012*

**business**

if you want to turn self-directed gain into social and economic benefits for all, you should use a/an --------strategy. a. charitable aid society b. government c. visible hand d. invisible hand

*June 6, 2012*

**Physics**

An aerialist on a high platform holds onto a trapeze attached to a support by an 8.0-m cord. (See the drawing.) Just before he jumps off the platform, the cord makes an angle of 41° with the vertical. He jumps, swings down, then back up, releasing the trapeze at the ...

*May 29, 2012*

**statistics**

John wants to advocate for making study rooms available to students. In an effort to learn whether the time of day or the day of the week would be most important to consider in deciding when to make such rooms available, he polls a randomly selected group of students to find ...

*May 20, 2012*

**Foreign languages**

I left out this sentence. Thank you very much. Write an email to your friend (120 words) telling him/her about your week so far and how you are going to spend your summer holidays.

*May 10, 2012*

**Foreign languages**

I would like you to check my sentences, please. Thank you, Writeacher. 1) Describe Dr. Jekyll’s experiment, his process of transformation and the main contrasting features of Dr Jeyll’s new self. (I want to point out the difference between Dr Jekyll and Mr Hyde in ...

*May 10, 2012*

**algebra**

A rectangular pool is 25 feet long and 12 feet wide. If the length is increased by 2x what is the new length? How would you use a quadratic equation to solve this?

*May 10, 2012*

**Foreign languages**

Writeacher, can you check these statements, please? Thank you. 1) Is it possible to use the expression "lose the bus"? I know one should say "miss the bus" but I just wanted to know if "lose" is a mistake. 2) Things are getting better since the ...

*May 10, 2012*

**math**

what is the value of y when x=2 in the equation y=-4x - 5?

*May 9, 2012*