Thursday
September 18, 2014

Posts by alex


Total # Posts: 2,565

CHEMISTRY
Hydrogen cyanide is used in the production of cyanimid fertilisers. It is produced by the following reaction: 2CH4 + 2NH3 + 3O2  2HCN + 6H2O (a) How much hydrogen cyanide can be produced starting with 100 kg of each of the reactants? (b) Which is the limiting reagent?
February 27, 2013

biology
what characteristics appear to show consistent development over the 4 million years of hominid evolution?
February 26, 2013

English
Help! I need help unscrambling these letters into two words it is due tommorow! The letters are tttrrlnemisianaaon it is the name of a mall, remember its a two letter word
February 26, 2013

Math
At a certain time of day, a tree that is Xft tall cast a shadow that is X-35 meters long if the distance from the top of the tree to the end of the shadow is X+5 meters, what is the height, X, of the tree?
February 26, 2013

Math
24x^3y^2/42x^7y^-6 please help i need to simplify i can only use positive intergers
February 26, 2013

Math
24x^3y^2/42x^7y^-6 please help i need to simplify i can only use positive intergers
February 26, 2013

Math
24x^3y^2/42x^7y^-6 please help i need to simplify i can only use positive intergers
February 26, 2013

biology
In a chorus of male frogs of one species, which would be considered by evolutionary biologists to be the fittest? The biggest frog. The frog that has the most descendants. The frog with the largest territory. The loudest frog. The frog that attracts the most females. I am ...
February 24, 2013

biology urgent
In mice, a gene controlling coat colour has 2 alleles; B (black) and b (white). A pure breeding black mouse is crossed to a white mouse and all the offspring are black. The offspring are then crossed to white mice. The phenotypes of the offspring of this second cross are ...
February 24, 2013

Math help
thank you
February 24, 2013

Math help
Calculate the length of the diagonal for the given rectangular prism. Round to the nearest tenth length 10 cm width 4 cm height 10 dont tell me the answer just show me how to do it
February 24, 2013

Math Alex
the options are 14.7 10.8 12.2 15.6
February 24, 2013

Math Alex
Calculate the length of the diagonal for the given rectangular prism. Round to the nearest tenth length 10 com width 4 height 10
February 24, 2013

Chemistry
Ammonia is composed of hydrogen and nitrogen in a ratio of 9.33 g of nitrogen to 2.00 g of hydrogen. If 2.19 g of nitrogen combined completely with hydrogen to form ammonia, what mass (g) of ammonia would be formed?
February 23, 2013

Algebra
I am pretty sure this goes like this 4y+3=3y+x (i) 2x+4y=18 (ii) Rearrange (i) so that x=4y+3-3y Take (ii) and sub x it will become 2(4y+3-3y)+4y= 18 2(y+3)+4y =18 2y+6+4y=18 6y+6=18 6y=18-6 6y=12 y=12/6 y=2 (iii) Now use what you found for y in (iii) and sub in the (ii or i ...
February 22, 2013

Math question?
how to get diagonal saying lenght hight width
February 22, 2013

Math question?
Calculate the length of the diagonal for the given rectangular prism. It says length hight width but in the lesson it says length hight deph how to i find the diagonal example
February 22, 2013

Math ASAP
Bonnie has a rectangular photographic print that is 5 inches wide and 7 inches long. If she multiplies both the length and width by 1.5, how will the perimeter of the print increase?
February 22, 2013

English help ASAP
thanks
February 21, 2013

English help ASAP
Which of the sentences below is punctuated correctly? (1 point )I opened the door and my cat ran outside. I opened the door, and my cat ran outside. I opened the door, my cat ran outside. i think its 2
February 21, 2013

music
Started by the creoles and went away from the norm of the classical and romantic style in western Europe. Also, it had slave rhythms which were unique to each plantation.
February 21, 2013

Math
Kelsea has 6 coins. One-third of her coins are dimes. The value of the dimes is one-fourth the value of the coins. How much money does Kelsea have?
February 21, 2013

Math Please answer
how to find slope of a graph without points please make it as simple as possible
February 19, 2013

math!!!!!!
the options are 6 3 9 and 12 i think its 9
February 13, 2013

math!!!!!!
How many lateral edges are there in a triangular prism
February 13, 2013

Math problem
The area of a triangle is equal to 1/2 the hight times the base. A triangle has a height of 10 and a base of 20. If the height of the triangle is increased by 10% and the base is decreased by 10%, then the area of the new triangle formed___________. ? a)stayed the same b) ...
February 12, 2013

Physics
A quantity of monatomic ideal gas expands adiabatically from a volume of 2.0 liters to 6.0 liters. If the initial pressure is P0, what is the final pressure?
February 12, 2013

physics
As your bus rounds a flat curve at constant speed, a package with mass 0.900 , suspended from the luggage compartment of the bus by a string 46.0 long, is found to hang at rest relative to the bus, with the string making an angle of 27.0with the vertical. In this position, the...
February 10, 2013

physics
A toboggan approaches a snowy hill moving at 15.0 m/s. The coefficients of static and kinetic friction between the snow and the toboggan are 0.460 and 0.350, respectively, and the hill slopes upward at 41.0 above the horizontal. Find the acceleration of the toboggan as it is ...
February 8, 2013

Social studies ASAP
Which of the following helped to increase the populations of northeastern cities more diversity successful cotton crops growth of factories and trade building of the Erie Canal i chose building of the erie canal
February 8, 2013

science
1. When you hold a piece of chocolate in your hand, why does the chocolate melt? 2. Which is a larger unit of heat: calorie, kilocalorie, Btu, or joule?
February 7, 2013

math probability
If I had the many black grey and white socks and i pulled out 2 socks that did not match. How many more socks do i have to take out of my drawer to be certain to have a matching pair
February 6, 2013

maths
Using properties of the triple scalar product and triple vector product, prove that (a ^ b)  (c ^ d) = (a  *c)(b * d) - (a * d)(b * c): [Hint: start by thinking of (a ^ b)  (c ^ d) as (a ^ b)  e, where e = c ^ d]
February 6, 2013

math
Find the percent of decrease. Original rent: $600 New rent: $450
February 6, 2013

history
who was the united states able to win the war in the pacific?
February 5, 2013

history
who was commander of the u.s. troops on bataan?
February 5, 2013

Physics
The radio station WBRU broadcasts in the radio spectrum at 95.5 MHz. What is the wavelength of this electromagnetic wave in meters?
February 4, 2013

Math
Please help with the following questions: 1. write 12 million in scientific notation 2. Write 17,600 in scientific notation 3. write 1.2 * 10 to the fourth power in standard form 4. write 5 * 10 to the sixth power in standard form
February 4, 2013

history
thanks
February 2, 2013

history
what was necessary for the united states to be able to increase its production of war materials in a short period of time?
February 2, 2013

Geography
What is the name of the salt lake located on the border between Israel and Jordan? I think the answer is the Dead Sea, is that right?
January 30, 2013

science
Would you expect a substance to be a solid, liquid, or gas at absolute zero? Explain your answer.
January 29, 2013

math ALGEBRA 1 PLEASE HELP!
You have $2.75 in dimes and quarters, and you have a total of 17 dimes and quarters. How many of each type of coin do you have?
January 28, 2013

Algebra
how to flowchart and backtrack 10 = 0.25x - 0.25
January 23, 2013

5th Grade Math
Glenda bought z containers of laundry detergent at $9 each. She gave the cashier $50. a. Find the change Glenda received in terms of z. b. If z = 3, how much change did Glenda receive?
January 22, 2013

5th grade Language Arts
I missed these questions on homework about adjectives. Can you double check my corrections? Directions: 1. tell what is the adjective 2. what noun or pronoun it's describing Sentences: 1. Rhode Island is a small state. My orig ans: 1. small, 2. Rhode Island Correction: 1. ...
January 20, 2013

geography
when did the seat of Japanese Emperors moved from Kyoto to Edo
January 19, 2013

math ALGEBRA 1 PLEASE HELP!
You and two friends scored all 7 runs for your team in a baseball game. Jeff scored twice as many runs as you, and Mary scored twice as many runs as Jeff. How many runs did Jeff score?
January 19, 2013

Math
A rectangular field will be fenced on all four sides. Fencing for the north and south sides costs $5 per foot and fencing for the other two sides costs $9 per foot. What is the maximum area that can be enclosed for $6000?
January 19, 2013

Geography
Which state capital is east of the 90 degree W longitude line: Jackson, Indianapolis, or St Paul. I think that Indianapolis is the answer is that correct? Also, Is this correct? The Pacific Ocean is East of Asia, East of Australia, West of North America and West of South ...
January 18, 2013

math
Alex has 1/2 pizza left in the fridge. At breakfast he ate 1/3 of it. What fraction of the original pizza does he have left?
January 18, 2013

Chemistry
Write the half-reactions for F3+ + I- ---> F2+ + I2 and balance it.
January 17, 2013

Trigonometry
a. Write a formula for Q as a function of t. b. What is the value of Q when t=10 1. Initial amount 2000; increasing by 5% per year 2. Initial amount 112.8; decreasing by 23.4% per year 3. Initial amount 5; increasing by 100% per year
January 15, 2013

5th grade Language Arts
I have a couple of phrases/sentences that need to be labeled as a type of figurative language. 1. Pitter Patter, raindrops are falling from the sky. (could this be onomatopoeia or personification?) 2. Boil the butter and bring it by the bank. (could this be an idiom or ...
January 14, 2013

Physics
a stone thrown from ground level returns to the same level of projection 4s after. with what speed was the stone thrown? Take g=10 m/s2
January 14, 2013

math
the sum of the reciprocals of 3 consecutive positive integers is 47 divided by the product of the integers. what is the smallest of the 3 integers
January 14, 2013

math
the sum of the reciprocals of 3 consecutive positive integers is egual to 47 divided by the product of the integers. what is the smallest of the 3 integers
January 14, 2013

Physics
Black Holes are suspected when a visible star is being noticeably pulled by an invisible partner that is more than 3 times as massive as the Sun. A red giant star is accelerated in a linear direction by gravity at 0.075 m/s2 towards an object that is 9.4 x1010 m away. a) What ...
January 11, 2013

Physics
The International Space Station is 370 km above the Earth's surface (Re = 6378 km, Me = 5.98 x 10^24 kg). What is the linear velocity of the space station in m/s
January 11, 2013

chemistry
The solubility of strontium oxide, SrO, in water is 22.8 g per 100 mL at 100 °C and 0.69 g per 100 mL at 30 °C. Is the dissolving of strontium oxide in water an endothermic or exothermic process?
January 10, 2013

math PLEASE HELP IM STUCK!!!
Admissions to a concert cost $45. A vendor sells t-shirts for $12 each. What is the maximum number of t-shirts you can buy?
January 10, 2013

math
admissions to a concerto cost $45. A vendor sells t-shirts for $12. You have $90. What is the maximum number of t-shirts you can buy?
January 10, 2013

science
how much potential energy did the object have before it fell?
January 9, 2013

science
a cart was pulled for a distance of 1 kilometer and the amount of work accomplished equal 40.000 joules. with what force was the work accomplished?
January 9, 2013

science
a cart was pulled for a distance of 1 kilometer and the amount of work accomplished equal 40.000 joules. with what force was the work accomplished?
January 9, 2013

physical science
push a box across a table with a force of 5 newtons and the box moves 0.5 meter. how much work has been accomplished?
January 9, 2013

math
I was confused somewhat more difficult
January 8, 2013

math
solve each system by elimination x+y=10 x-y=2
January 8, 2013

math
1. y=xt1 2x+y=7 2. x=y-2 3x-y=6 3. y=2xt3 5x-y=-3
January 8, 2013

algebra
solve each system by substitution 1. 6x-3y=-33 2xty=-1 2. 2x-y=7 3x-2y=10 3. 4x=8y 2x+5y=27
January 8, 2013

physical science
Mike jogs east at a rate of 4 mph. The wind is blowing west at 1 mph. What is Mike's velocity?
January 8, 2013

algebra
supose you bought eight oranges and one grapefruit for a total of $4.60. later day, you bought six oranges and three grapefruits for a total of $4.80. what is the price of each type of fruit?
January 8, 2013

algebra 2
please help me
January 8, 2013

Algebra 2
Write a polynomial function in standard form with the given zeros: x=2,-2,4
January 7, 2013

Physis
a 2kg mass is hung from a tree and is released. Using the nodes on the graph, sketch the general shape of the vertical position of the mass versus time
January 4, 2013

grammar
1is correct
January 3, 2013

Physics
A coin is placed on an old record turntable which rotates at 78 rpm. The coefficient of friction between the record and the coin is 0.17. a) What is the angular speed of record in radians/s? b) At what distance (m) from the center will the coin begin to slide off the record? c...
January 3, 2013

Physics
Thanks
January 3, 2013

Physics
A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tangential velocity, v, of the plane? .
January 3, 2013

Physics
A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? c) What is the ...
January 3, 2013

Physics
I was not taught how to do this
January 3, 2013

Physics
c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s? d) A mass spins with a tangential speed of 1.2 m/s on the end of a string which is 0.75m long. What is the period of the rotation in seconds?
January 3, 2013

Physics
On August 12, 2005 the Mars Reconnaissance Orbiter (MRO) was launched from Earth and reached Mars on March 10, 2006. The orbiter is in roughly circular orbit about 390 km above the martian surface. Mars has a radius of 3396 km and a mass of 0.642 x 1024 kg (6.42E23 kg). b) ...
January 3, 2013

5th grade math (word problems)
pennies! Thanks Ms. Sue
January 3, 2013

5th grade math (word problems)
I'm not sure how to solve the following problem: If you divide 1/10 of a dollar into parts that are each 1/100 of a dollar, how many parts are there? What are they called? To solve, would part of the answer be that i would have 10 parts of 1/100 (because I divide 100 by 10...
January 3, 2013

Math
P=2l+2w P-2l=2w (p-2l)/2=w
January 3, 2013

Physics
A coin is placed on an old record turntable which rotates at 78 rpm. The coefficient of friction between the record and the coin is 0.17. a) What is the angular speed of record in radians/s? b) At what distance (m) from the center will the coin begin to slide off the record? c...
January 3, 2013

Physics
Thanks
January 3, 2013

Physics
A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tension in the string?
January 3, 2013

Physics
A toy plane of mass 0.624 kg is flown in a circle when attached to a string. The plane moves around the circle with a rotational speed of 8.09 rpm. The length of the string is 2.60 m. What is the tangential velocity, v, of the plane? .
January 3, 2013

Physics
A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? c) What is the ...
January 3, 2013

Physics
c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s? d) A mass spins with a tangential speed of 1.2 m/s on the end of a string which is 0.75m long. What is the period of the rotation in seconds?
January 3, 2013

Physics
On August 12, 2005 the Mars Reconnaissance Orbiter (MRO) was launched from Earth and reached Mars on March 10, 2006. The orbiter is in roughly circular orbit about 390 km above the martian surface. Mars has a radius of 3396 km and a mass of 0.642 x 1024 kg (6.42E23 kg). b) ...
January 3, 2013

Algebra
Are you in Algebra 2?
January 2, 2013

Art
How can lines in a painting lead your eyes
January 1, 2013

Math problem solving investigation: guess and chec
The area of each square is twice the area of the next smaller square drawn in it. If the area of the smallest square is 3 square centimeters, what is the area of the largest square
December 29, 2012

english
Which of the following sentences is correctly punctuated A. The sea calmed; but no boats, left shore. B. The sea, calmed, but no boats, left shore. C. The sea calmed, but no boats left shore. D. The sea calmed but no boats left shore.
December 22, 2012

Physics
Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .
December 20, 2012

Physics
How many times further from the Sun than the Earth is an asteroid with an average orbital period of 7.43 years? (HINT: Let the distance to the Earth be R=1 AU)
December 20, 2012

Physics
Use Kepler's Laws and data about the Moon to determine the orbital period (hours) of a satellite that is 17512 km above the SURFACE of the Earth. HINT: How does the radius of the Earth affect the problem?
December 20, 2012

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