Thursday
April 24, 2014

Posts by richard


Total # Posts: 228

college physical science
how much would a 80.0kg person weigh on mars if the acceleration of gravity is 3.93m/s2

college physical science
According to table 1.3, what volume of iron would be needed to balance a 1.00cm3 sample of lead on a two pan laboratory balance? Table 1.3 shows densities g/cm3 such as iron=7.87g/cm3 and lead is 11.4g/cm3

Physical Science
A cubic tank holds 1,000kg of water. What are the dimensions of the tank in meters. Explain your reasoning.

Physics
Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics?

Physics
The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n2, where n=1 labels the lowest or “ground” state, n=3 is the third state, and so on. If the atom’s diameter is 1x10-10m in...

Chemistry
A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and N...

Chemistry
A buffer prepared by mixing equal amounts of the salts Na2HPo4 and NaH2PO4 to give a total phosphate concentration of 0.1M. What is the concentration of Na ions? I believe it is 0.3M but am having trouble understanding why when I write out the dissociation of the Na2HPo4 and N...

Physics
How does one Coulomb of charge compare to the charge on an electron? How do you think such a large difference arose historically?

Physics
Where should most of the mass be for an industrial fly wheel? Why? can't find any thing about this in my book. need help answering this.

math
Hi, the £ is pound sterling and p is pence, so can be swapped for $ and c/

math
I am an odd multiple of 50p. My number of £s is double 18. What am I?

Physics/ Science
How does a derivation differ from an experiment or a theory?

Physics
Having trouble determ the formulas for the follow problems. 2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go? 60 km 3. At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds. During these two seconds, how far does it...

physics
An object 7.25 cm high is placed 15.1 cm from a convex mirror of radius 55.2cm. (a) What is the image distance?

math
3/5 + 1/10=? i got 7/10 or 12/20, which one is correct?

music
2. What role did Totalitarianism play in the creation of music particularly in Germany and the Soviet Union during the twentieth-century? Which composers were most affected by totalitarianism? How did affect their lives?

reply to Q " Physics hard... can't get it right"
kk this is what i did V=strt(3*k=8.31*T=1365)/m=5.32*10^-26

Physics hard... can't get it right
oo ok let me try that also can you tell me the distinction like when to use gas constant and boltzmann constant

Physics hard... can't get it right
strt(3 * k=8.31 * T=1365)/ m = 5.32*10^-26

Physics hard... can't get it right
A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of Oxygen is 32 g/mol. Boltz...

Physics hard...
Young's Modulus (Y) 20 X 1010 N/m2 Shear Modulus (S) 8.1 X 1010 N/m2 Bulk Modulus (B) 16 X 1010 N/m2 The table to the above represents various properties of steel. You have steel wire 4.9 meters in length that stretches 0.16 cm when subjected to a force of 400 N. What woul...

physics
A cylinder of compressed Oxygen is carried on a spacecraft headed for Mars. The compressed gas cylinder has a volume of 10,000 L and is filled to a pressure of 200 atm at 273 K. The maximum pressure the cylinder can hold is 1000 atm. The molar mass of Oxygen is 32 g/mol. Boltz...

trig
Graph three periods of the function. (identify period and phase shift and intercepts) y = f(x) = √3/2 sin(2x) - 1/2 cos(2x) if you can't graph it can you at least get it into that simpler form which is graph able.

trig1 more question
it is always true that if -1 ≤ x ≤ 1 then cos(Arccos(x)) = x Give an example showing that Arccos(cos(x))= x need NOT be true for all x

Trigonometry
Find all solutions for the following equation in the interval 0 ≤ x <2pi 3cos(3x)=6 i got cos3x=2, don't know how to go further i think it would be no solution but just want to confirm.

physics
20meters

Government
How can the actions of urban elites help explain the Great Recession?

social studies
Why did Mao Zeodong led the cummunists to power in china

Math
The width of a rectangle is fixed at 16 cm. What lengths will make the perimeter greater than 78cm? Would the answer be 23 because 16*2+23*2=78cm or would the answer be 24. Because the perimeter is greater than 78cm

Math
thank you

Math
Media service charges $20 for a phone and $30/month for its economy plan. The equation c=30t +20 describes the total cost,c, of operating Media Services phone for t months. A) The total cost for 8 months of service is? My answer $260 If a customer has only $90 available, how m...

Math
Thank you for the help.

Math
Trains A & B are traveling in the same direction on parallel tracks. Train A is going 60mph and Train B at 80mph. Train A passes a station at 6:25 am. If Train b passes the same station at 6:37, what time will B catch up with A? The answer I received is: 7:03am, is that correct?

Business Law
Express versus Implied Contracts. Suppose that a local businessperson, McDougal, is a good friend of Krunch, the owner of a local candy store. Every day on his lunch hour McDougal goes into Krunch¡¦s candy store and spends about five minutes looking at the candy. ...

chemistry correction
1. Which two elements react vigorously with each other? A: Chlorine and lithium B:Chlorine and potassium C:iodine and lithium D:iodine and potassium my answer is B 2. which statement about electronegativty is correct. A: Electronegativity decrease across a period. B:Electroneg...

Math
The exhibit hall at the fair is dividid into three sections. Tow-fifths of the exhibits are in section B of the hall, and another two-fifths ain in section C. What fraction of the exhibits are in located in section A? We have multiple choice answers. Thank you

chemistry
1.Use the Vsepr theory to predict and explain the shape and bond angle of each of the molecules SCI2 and C2CL2. 2.Deduce whether or not each molecule is polar, giving a reason for your answer...Any help please??

chemistry
.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces.

chemistry
1.predict and expalain the order of melting point for propanol, butane, and proanone with refernce to their intermolecular forces. 2. The element sodium, aluminum, silicon, phosphrous, and sulfur are in periods 3 of the periodic table. Decribes the metallic bonding present in ...

COM/155
Assume you essay was written for an audience of a Midwest city's newspaper readers. What will you include in your introduction? What tone will you use? You can use your essay topic to answer these questions, as your answers will help you write your introduction. Remember, ...

chemistry
What will be the mass in grams of hydrogen atoms (only) that will be present in 22.2 g of compound A (XH3)?

Math
dx can't be zero

chemistry
Magnesium reacts with HCl(aq) to form MgCl2 and H2(g) ____ Mg(s) + ____ HCl(aq) -----> ____ MgCl2(aq) + ____ H2(g) The following data was collected for the above reaction: Mg (g) 5% (m/v) HCl (ml) H2 gas produced (ml) 0.50 10 167 0.50 20 333 0.50 30 500 0.50 40 500 0.50 50 ...

chemistry
The actual chemistry question was, given that there are 4.19 g of C6H6 how many moles do you have and this is how I solved it and it was wrong. 4.19g/78g/mole = .054 moles of C6H6

chemistry
How many moles are in 13grams of C6H6. should this question be broken down into its imperical formula (CH)6 and calculate the number of moles of CH and multiply by 6 or calculate the gram molecular wt of C6H6 and divide it into 13 grams? I took 13 grams and divided it by the g...

math
Sorry, a 100-gon is a 100 sided polygon.

math
a lot of times teachers will throw in a unit that has no meaning. They do this to get used to the idea of always carrying your units out with the problem. I suspect that is what is happening with your problem as I have never heard of a gon.

chemistry
How many moles are in 13grams of C6H6. should this question be broken down into its imperical formula (CH)6 and calculate the number of moles of CH and multiply by 6 or calculate the gram molecular wt of C6H6 and divide it into 13 grams?

Trigonometry
take the tangent of 70 degrees and multiply it by 30 yards.

physics.
: When the mass hits the pile, it has kinetic energy. This energy is transformed into other forms of energy as the speed of the falling mass rapidly reduces to zero. As this happens, the pile is forced a small distance into the ground. question: Explain how a large force is pr...

history
What were the main elements of Johnson’s War on Poverty?

history
What were the main elements of Johnson’s War on Poverty?

Calculus
Would someone please tell me how to solve these two problems? Find the indefinite integral: x(x-1)^5 dx (v^2)(1-v)^6 dv

science
what is air? a compound, a mixture, a solution, or an amalgam

chemistry.
What amount of H2(g) is produced when 12g of magnesium reacts completely with dilute HCl(aq) Mg(s) + 2HCl(aq) ------> MgCl2(aq) + H2(g)

chemistry.
What?

chemistry.
Lithium hydroxide reacts with carbon dioxide as follow. 2LiOH + CO2________ Li2CO3 + H2O What mass (in grams) of Lithium hydroxide is need to react with 11 g of carbon dioxide?

Physics
Thank you, I really appreciate that help. We haven't done derivatives yet and its hard to see without that knowledge...

Physics
A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s? I tried solving using s=Vit + (.5)at^2 but I can't find t...

Math
First Estimate, and then multiply to get the exact answer. 2*4/7*7*5/11*5

Math
First Estimate the answer. Then find the exact answer. Simplify your answer if possible. 9*2/7*8/5/7

Math
First Estimate the answer. Then find the exact answer. Simplify your answer if possible. 9*2/7*8/5/7

Math
First Estimate the answer. Then find the exact answer. Simplify your answer if possible. 2*1/3*15

chemistry.
They are__________Mol of carbon atoms in 4 mol of Dimedthysulfoxide A: 2 B: 6 c: 8 D: 4 E: 3 My answer is C:8 but can any one help me with the method to show the right answer. 2. There are ___________Sulfur atoms in 25 molecules of c4H4S2. My answer is 50...Can one help me. 3....

math
thank you

math
Is The factors of 385 = 1,5,7,55,77,385?

Science
THis is also known as an alchohol. a)hydroxyl group b) amino group c) phosphate group d) carboxyl group

Science
The typical ratio for a carbohydrate is a) CHO b) C2HO c) CH2o d) CHO2

Math
% increase in mean population from 1950 = 2,556,000,000 to 2000 = 6,279,000,000 =

Math
Write 116 2/3 as a fraction or mixed number.

Math
I need to find the missing length of a right angle if one side is 7 and one is 25?

Biology
Can some body help me to explain how DNA is formed?

language/reading
have summer project. need to do timeline on the book "THE WALKABOUT" need to know how to go about doing this correctly.

algebra
I think that the answer is 2/100=50/2 cross multiply it to make it 2x2=4 and 50x 100 is 5000 or 2/100= 2/50 cross multiply it to get 100 and 200 divide it by 2 to get 100 and to get 50...I think i messsed up :/

Classroom Management
Your the teacher, he is the student. There said, your in charge and he isn't. Assuming, you don't to anything that violates your teacher to student relationship you be just fine. My advice is to ask if it should happen again to please move, if something similar happens...

LaL
what does the chick's behavior in the poem teach you about what to do when you don't know what to do.

Physics - URGENT
Actually, I think it should be: KE of bullet@bottom = KE of block&bullet@top + PE of block&bullet@top Is that right?

Physics - URGENT
Wouldn't it be KEbottom = KEtop without the mgh term since there's no height at the bottom?

Physics - URGENT
So mg=mrw^2? (and how do I find the w at the top of the loop?)

Physics - URGENT
A small block of mass 5 kg initially rests on a track at the bottom of a circular, vertical loop-the-loop, which has a radius of 0.8 m. The surface contact between the block and the loop is frictionless. A bullet of mass 0.7 kg strikes the block horizontally with initial speed...

english
imagine many years from now someone is writing a story about my life .how will the author describe me? what major accomplishments will he or she highlight?clue i like making airplanes.

7th grade
Maria left the starting line at 8:30 a.m. and drove at an average rate of 40 mph. What time did she arrive at check point 1?

Physics
An upright spring which is normally 3 m is compressed 2.3 m and a 2 kg block is placed on it. When it is 5 meters above the ground it is going 10 m/s. What is the spring constant of the spring? How high will the block travel?

8th grade
If f(x)=4x-5 find the value. f(c) f(3a2)

Statistic
You shouldn't be trying to get answers to the final here!

PHSICS
a=gsin(theta) a=9.8 sin 25° a= 0.43 Uf=Ui +at Uf= 0 + a(10) Uf=0 +4.3 Uf=4.3 m/s

6th grade math
28 x 15 simplify by using distributive property,

art
what is a motief

hardware
what is hardware

7th grade math
idontknow

math
write 3x^2 +8x-25 in the form a(x+h)^2,where a,h and k are real numbers

math
determine Q whenT=73.16 Given T=47.4é^0.31Q (It is e raised to 0.31Q where Q=Theta

Math
Thank you!!

Math
Hello! Please help me out here. How do you find the circumference of something when you of 13in as your radius? Please answer this question.

math
5+5/10=5 1/2. If you were talking about fractions you to make into the simplest form after adding the equation.

Science
How do scientists seperate aniamals into classes?

American History
But why there were The Stamp Act?

American History
But why there were The Stamp Act?

American History
Why did King George III taxed the colonists?

Indiana History
On my homework it said name many plains and lakes etc.

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