Wednesday
October 1, 2014

Posts by Ali


Total # Posts: 502

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

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 thats 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

alegbra
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

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

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

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

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

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

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

language arts
i just remembered it was main idea, purpose, and intent
November 8, 2010

language arts
thank you
November 8, 2010

language arts
what are three major parts of a summary?
November 8, 2010

Math
collect like terms and substitute 0for y? i think im just now doing this in my senior year in middle school algebra1
November 8, 2010

pre algebra
try to set up an equation im in algebra 2 so i may be able to help you
November 8, 2010

geometry
are the sides decimal?
November 8, 2010

pscyhology
technolly no one can tell you becuase its a test but lets just say its not a test they all look right
November 8, 2010

math
Hint: set up an equatoin
November 8, 2010

Graph help!
Sketch y= -(1/4) (2)^(x-4)+5 I know that the basic equation is y=2^x so is the graph translated 4 units right, vertically stretched by a factor of (1/4), reflected on the x-axis and translated up 5?
November 8, 2010

check math question
Thank you!
November 8, 2010

check math question
Given y=2^x Predict the equation for the graph that has been reflected in the y-axis, given a vertical stretch by a factor of 5, translated 2 units right and 5 units down. I have: y= -5 (2) ^ (x-2) - 5 Is this correct?
November 8, 2010

Graphing
Sketch y= -(1/4)(2)^(x-4)+5 by first including a table describing its major features.
November 8, 2010

Math Graph
Sketch y= -(1/4)(2)^(x-4)+5 by first including a table describing its major features.
November 8, 2010

math
In a Geometric progression the sum of its first 4 term is equal 15, and the sum of the next term is equal to 15/16. find its first term and its common ratio
November 5, 2010

math
in an arithmetic progression the 50th term is equal to 3, and the sum of the first 8th is equal to 23. find the first term and the common difference
November 5, 2010

math
a rubber ball fell from a high of 16 feet and then its rebounded until it rested, such that each time it rebounded to a high =1/2 the high rebounded to previouslly a) find the high rebounded to after the 10th term b)find the distance cover by the ball before it rested
November 5, 2010

math
If the sum of the first and the second terms of an infinite Geometric progression is equal to 3/8, and the sum of its term is equal to 1/2. find the common ratio of the first term of the progression
November 5, 2010

math
in a Geometric progression the sum of the first and the second terms is 90 and the sum of the second and the fourth terms is equal to 30.find the sum of the first 8th term in the progression
November 5, 2010

math
find the sum of the first 8th term of the Geometric progression, 1,3,9,27
November 5, 2010

math
find the sum of the 20th term a=6 and r=2/3
November 3, 2010

Math
27
November 2, 2010

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