# Posts by ali

Total # Posts: 833

**Science**

Was Daniel Bernoulli for the atomic theory or against it and explain why?

*December 8, 2011*

**english**

can anyone help me with explicationg act 3 scene 1 (setting) (charcater) (plot) (theme) of macbeth?

*December 5, 2011*

**math**

The force F (in Newtons) required to move a box of mass m kg in motion by pulling on an attached rope is F(x) = f m g/(cos(x))+ f (sin(x)) where x is the angle between the rope and the horizontal, f is the coefficient of static friction and g = 9.8 m/s^2. Find the angle x that...

*November 17, 2011*

**Calculus**

The answer might be easy if you told us the minimum height requirement. Since the ceiling is cheaper, the lower the height, the cheaper it will be. Once we know that, the squarer the building, As equal as possible in length & width, the smaller the perimeter and therefore the ...

*November 13, 2011*

**Finance**

Trying to figure out how to do problems like these. So confused! 1. The receivables turnover for 2009 is 10 times. 2. All sales are on account. 3. The profit margin for 2009 is 14.5%. 4. Return on assets is 22% for 2009. 5. The current ratio on December 31, 2009, is 3.0. 6. ...

*November 13, 2011*

**calculus**

Differentiate the function. h(x)= ln(x+ sqrt(x^2 -4))

*November 9, 2011*

**chemistry**

A student measures 0.2452 g of a monoprotic solid acid, and dissolves the solid in water to make 100.0 mL of solution. the entire solution is titrated to a phenolphthalein endpoint with 45.06mL of 0.1725M KOH. A. what is the molarity of the acid solution? B. what is the molar ...

*November 9, 2011*

**Calculator Help**

1. The csc^-1(1.23) I got 1.061 in radian mode 2. Cot^-1(-2.26) I got 0.8240 in radians 3. Cos^-1(-0.84) I got 2.568 Are these correct?

*October 30, 2011*

**Physics**

Sam, whose mass is 72.0 kg, takes off down a 51.0 m high, 11.0^\circ slope on his jet-powered skis. The skis have a thrust of 180 N. Sam's speed at the bottom is 43.0 {\rm m/s}. What is the coefficient of kinetic friction of his skis on snow?

*October 24, 2011*

**algebra**

Susie has a budget of $92 to spend on clothes. The shorts she wants to buy are on sale for $14 each. The shirts are on sale for $12 each. If Susie purchases four shorts, what is the maximum number of shirts she can buy to go with the shorts?

*October 24, 2011*

**science**

How much work does it take to raise a 3kg object 5m into the air? (a) What is the potential energy of the object when it is 5m in the air? (b) What does this tell you about the potential energy you get when you do work to lift an object? (c) If you drop the object, how fast is...

*October 22, 2011*

**reading strategies**

reading titles and headings,and trying to get an overview of what lies ahead in reading passageis called

*October 22, 2011*

**science**

A 4kg block is sitting on the floor. (a) How much potential energy does it have? (b) How much kinetic energy does it have? (c) The block is raised to 2m high. How much potential energy does it have? (d) The block is raised to 4m high. How much potential energy does it have? (e...

*October 22, 2011*

**physics**

as a baseball player strikes the ball with his batt the 1kg bat applies an average force of 250N on the .15kg baseball for .2 seconds. A) what is the force applied by the baseball on the bat? what is the acceleration of the baseball? C) what is the speed of the baseball at the...

*October 20, 2011*

**physics**

Standing on a balcony, you throw your keys to a friend standing on the ground below. 1.2 seconds after you release the keys, they have an instantaneous velocity of 15.4 m/s, directed 60° below the horizontal. What initial velocity did you give them?

*October 18, 2011*

**History**

what were 5 new weapons used in world war 1?

*October 17, 2011*

**calculus**

lim (9x^4+2x+1)^1/2/(3x^2+1) as x->-infinity

*October 9, 2011*

**physics**

A cube of aluminum is 4cm on each side.find the mass of the cube. (Density of aluminum is 2.7g/cm3

*October 6, 2011*

**math**

regroup 22: 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.

*October 3, 2011*

**math**

write three number sentences where difference is 50.

*October 3, 2011*

**science**

Steel expands 1 part in 100 000 for each 1°C increase in temperature. If the 1.5km main span of steel suspension bridge had no expansion joints, how much longer would it be for a temperature increase of 20°C?

*October 2, 2011*

**chemistry**

194

*September 27, 2011*

**trig**

A space shuttle 200 miles above the earth is orbiting the. Earth once every 6 hours. how far does the shuttle travel in one hour? Note the radius of earth about 4000 miles.

*September 17, 2011*

**English check please help me out**

English check please help me out "Accident and Recovery.

*September 14, 2011*

**Math**

around 55% exactly .5472

*September 6, 2011*

**marketing**

For business marketing, we are planning to make and sell soap, with our target audience as teenagers. What do you think we need to do in order to attract lots of customers and for them to sell?

*August 31, 2011*

**science fair ideas**

thank you both!

*August 28, 2011*

**science fair ideas**

What are some really good/cool science fair ideas?

*August 28, 2011*

**physical science**

I talked too my teacher over the this morning and he said that his question is written correctly but after i tried to tell him that's what proves the plate tectonic theory he said that i needed to research it more and re-evaluate my answer

*August 28, 2011*

**physical science**

One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?

*August 28, 2011*

**science**

please help!

*August 27, 2011*

**science**

One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?

*August 27, 2011*

**algebra**

it may be a division as a one is overtop so the posibility is that the answer may be 6.5

*August 27, 2011*

**math**

i am good at math i go to school every day i love school so much i love my teacher and my school is name is sonoran sky

*August 25, 2011*

**english**

sir explain me about question tags..?

*August 21, 2011*

**Biology**

What is the primary focus on all biological studies?

*August 11, 2011*

**math**

A furniture store receives an invoice dated Sept. 27 for 5 bedroom sets at $3,000 each. The invoice indicated a trade discount of 5/8/3. The seller of the furniture prepaid the freight of $200. Terms were 2/10 EOM. Assuming Mel pays on Nov. 2, what amount would be paid. (Be ...

*August 6, 2011*

**physics**

A river flows at a uniform speed of 2ms-1 and is 100m wide. A motor boat has a maximum speed in still water of 7ms-1

*August 4, 2011*

**statistics**

You want to estimate the grades of st2%atistics students who gets grades of C or better. How many students should you survey to be 95% confident that the sample percentage is off by no more than 2 percentage points.

*July 26, 2011*

**world history**

How is the historical event of the 1981 Springbok Tour is, or was, of significance to New Zealanders.

*July 3, 2011*

**chemistry**

When magnesium is burnt completely in air the totol mass of the product was found to be grater than the original mass of the piece of magnesium.explain

*June 14, 2011*

**statistics**

A certain geneticist is interested in the proportion of males and females in the population that have a certain minor blood disorder. In a random sample of 1500 males, 75 are found to have disorder, whereas 80 of 2000 females appear to have disorder. Find a 90% confidence ...

*June 3, 2011*

**statistics**

It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. Random sample of 10 automobile owners are asked to keep a record of the kilometers they travel. If the sample mean and standard deviation of automobile driven are found to be 23,500...

*June 3, 2011*

**statistics**

A sample of 25 men has a mean weight of 65kg with standard deviation of 8kg. Suppose that the weight of men follows normal distribution with a standard deviation of 10kg. Find a 95% confidence interval for the population mean μ.

*June 3, 2011*

**statistics**

If 50% of the automobiles sold by an agency for a certain car are equipped with diesel engines, let X represent the number of diesel models among the next 5 cars sold by this agency, write the probability distribution of X.

*June 3, 2011*

**MATH**

553seven x 5seven

*May 17, 2011*

**math**

it costs $.20a min for ashley to call her best friend in mexico she calls her after school every day she called her friend @ 3:30 yesterday the cost was $8.60 what time did she end her call explain

*May 10, 2011*

**university**

Compare and contrast packet and circuit switching in 250 to 300 words. Which is more commonly used? What are the advantages and disadvantages of each?

*May 9, 2011*

**science**

what is the chemical equation for sodium nitrate?

*May 8, 2011*

**Calc**

this service is so nice make engineering services to coming education learning

*May 3, 2011*

**Trigonometry:Angles of Elevation and Depression**

Carlos is making some observations from the roof of a building. Which angle is the angle of depression from Carlos to the car?

*May 1, 2011*

**math**

what is tan p,out of p,8,q,6,r,and 10,in a fraction form?

*April 21, 2011*

**Math**

In a fish tank, there are two fewer blue fish than three times the number of yellow fish. If there are 10 blue fish, what is the number of yellow fish(n). Write an equation to solve for n.

*April 18, 2011*

**pre cal**

assume the angle is in the first quadrant, and sin theta equals 1/5. what is sin 2 theta?

*April 17, 2011*

**math**

simplify and state the restrictions of a^2- 9b^2 / 5a^2-11ab-12b^2

*March 27, 2011*

**science**

Calculate the molarity of each solution. a) 1.0 mol KCl in 750 mL of solution b) 0.50 mol MgCl2 in 1.5 L of solution

*March 24, 2011*

**computer science**

please write this in C. Thanks

*March 4, 2011*

**computer science**

n insurance company wants to offer a new 5-year, level-term life insurance policy to recent college graduates. The policy will have a face value (the amount paid in case of death) of $50,000. Normally, the company charges different premiums depending on the age, gender, ...

*March 4, 2011*

**physics**

Batman, whose mass is 119 kg, is holding on to the free end of a 14.6 m rope, the other end of which is fixed to a tree limb above. He is able to get the rope in motion as only Batman knows how, eventually getting it to swing enough that he can reach a ledge when the rope ...

*February 25, 2011*

**MATH**

how many one-inch square tiles will he need to cover a surface that is 2ft by 3ft

*February 24, 2011*

**statistics**

.25 .125 .312 .687

*February 20, 2011*

**algebra**

Josh hit a baseball straight up into the air. The equation below describes the height of the ball (h), in meters, as a function of time (t) in seconds. h(t) = -9.8t² + 30t + 1.5

*February 16, 2011*

**physcis**

In the diagram shown the pulley at frictionless and the cylindrical load weighs 800. A. Determine the tension in the cable. B. Determine the horizontal component of the reaction of the pin A. C. Determine the vertical component of the reaction of the pin A.

*February 3, 2011*

**Algebra 2**

A Rectangular Field is to be enclosed by a fence and divided into three parts by another fencer. Find the maximum area that can be enclosed and separated i this way with 500 meters of fencing

*February 3, 2011*

**American History**

How did the pattern of European immigration shift in 1890?

*January 30, 2011*

**physics**

a hockey puck rebounds from a board. the puck is in contact with the board for 2.5 ms. dertermine the acceleration of the puck over the time interval. V(i) = 26 m/s...at angle of 22 degrees. V(f) = 21 m/s...at angle of 22 degrees. a=?

*January 27, 2011*

**math**

I don't know

*January 27, 2011*

**physics**

Two point sources, 5.0 cm apart are operating in phase, with a common frequency of 6.0 Hz, in a ripple tank. A metre stick is placed above the water, parallel to the line joining the sources. The first nodal lines (the ones adjacent to the central axis) cross the metre stick ...

*January 16, 2011*

**physics**

1356 83 degrees

*January 16, 2011*

**geometry**

if the length of RS is 12 and the length of ST is 13 , which of the following could be the length of RT ? A> 24 , B> 26 , C> 28 , D> 29 E> 30

*January 15, 2011*

**Law and ethics in allied health**

ive been trying to figure this question out for 20 minutes.. if you could help me that would be great. - Dennis, a new medical assistant at Dr. Hernandez's office, notices that Beth has been waiting over an hour to get an allergy shot. Dennis has never given a shot before...

*January 13, 2011*

**physics**

Two point charges, +3.63 µC and -5.95 µC, are separated by 1.18 m. What is the electric potential midway between them?

*January 12, 2011*

**Physics**

A particle has a charge of +1.5 µC and moves from point A to point B, a distance of 0.18 m. The particle experiences a constant electric force, and its motion is along the line of action of the force. The difference between the particle's electric potential energy at...

*January 12, 2011*

**Physics 11th Grade**

the total kg would be 85 kg. then multiply by 9.8 to find fg. to lose weight he has to have a downward acceleration ( push downwards on a countertop while standing on the scale).

*January 9, 2011*

**Math/Trig**

Write an equation for a cosine function with an amplitude of 2/3 , a period of pi, and a vertical shift of 2 units up.

*January 4, 2011*

**physics**

thank you. this was very helpful.

*January 1, 2011*

**physics**

thank you for responding: i did: (9.0*10^9)cos30((4.0*10^-6)^2)/(0.2^2) using this i got 3.1. so then i need to double it because it's two spheres. right? and sorry about the formula in the question. i confused my self with the "times" and "exponent".

*January 1, 2011*

**physics**

Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this: (K)Cos30((4.0*10-6)*2)/(0.2*2) and i get 3.1 ...

*January 1, 2011*

**physics**

Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this: (K)Cos30((4.0*10-6)*2)/(0.2*2) and i get 3.1 ...

*January 1, 2011*

**physics**

Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this: (K)Cos30((4.0*10-6)*2)/(0.2*2) and i get 3.1 ...

*January 1, 2011*

**Science 6th grade**

What is the best way to tell a chemical change has taken place? 1. The matter changes color 2. The mixture separates into layers 3. The composition chnages

*December 30, 2010*

**finance**

Harvard Group Case Analysis Foreign Exchange Hedging Strategies at General Motors: Transactional and Translational Exposures

*December 19, 2010*

**11th grade math**

Using the formula 4.9t^2... A object is dropped how long will it take it to fall 92 meters

*December 16, 2010*

**chemistry**

my moth balls froze at 54 degrees celsius, what kind are they?

*December 15, 2010*

**business comunication**

write an application in response to an advertisement in the daily dawn for the post of manager hrm in sony electric lahore

*December 6, 2010*

**HISTORY**

what is the official currency of the united states?

*December 2, 2010*

**algebra**

set up an equation, slope-intercept might help!

*December 2, 2010*

**physics**

db = 10log(p2/p1) = 5. 10log(p2/p1) = 5, Divide both sides by 10: log(p2/p1) = 0.5, p2/p1 = 10^0.5 = 3.16.

*December 1, 2010*

**statistics**

an experiment consists of 4 tosses of a coin.denoting the outcomes HHTH,THTT,..and assuming that all 16 outcomes are equally likely, find the probability distribution for the total number of heads.

*November 21, 2010*

**vocab**

intermenttently what does this word mean

*November 19, 2010*

**language arts**

thanks

*November 19, 2010*

**language arts**

What is the sense of the word "starts" in the sentence below? By doing this she starts something she did not know was going to happen. Is the answer intermenttently?

*November 19, 2010*

**accounting**

khulood

*November 18, 2010*

**math**

The longest steel arch bridge is the new river gorge near fayetteville,west virginia. write an inequality that describes the length in feet ,1, of every other steel arch bridge. the new river gorge bridge is 1700 feet long.

*November 16, 2010*

**Statistics**

Assume a population of any 4 numbers(suppose: 4,8,15,19). Select a random sample of size 2 with replacement from the population. List all the possible samples and their corresponding values of x̄ “x-bar” and then find the probability distribution of “X-bar...

*November 16, 2010*

**chemistry**

A sample of carboxylic acid is added to 50.0 mL of 2.27 M NaOH and the excess NaOH required 28.7 mL of 1.86 M HCl for neutralization. How many moles of NaOH reacted with the carboxylic acid?

*November 11, 2010*

**12 Math**

Graph the results of a coin toss: Toss Coins 0 20 1 12 2 5 3 1 4 0 State an equation that best fits the results (use n to represent the number of the toss). What physical phenomenon does this model? I was able to graph this, I just do not understand how to write the equation, ...

*November 10, 2010*

**language arts**

ill try

*November 8, 2010*