Wednesday
October 22, 2014

Posts by Rick


Total # Posts: 300

chemistry
A 114g sample of sucrose undergoes incomplete combustion according to the reaction C12H22011 + 5O2 ---> 4C + 6CO + 2CO2 + 11H2O using the chart of enthalpies of formation determine the enthalpy released by the sample i think that it is a simple enthalpy problem but in the ...
July 25, 2010

Physics
velocity = displacement/time 4m/s = 20/time 20/4 = 5s so any time less than 5 seconds is enough to beat vincent. I think thats the answer..
July 25, 2010

Physics
Force and Motion: A 12 kg armadillo runs onto a large pond of level, frictionless ice. The armadillo's initial velocity is 5m/s along the positive direction of the x-axis. Take its initial position on the ice as being the origin. It slips over the ice while being pushed by...
July 7, 2010

Physics
A force vector F of magnitude 12N is applied to a FedEx box of mass m2=1kg. The force is directed up a plane tilted by theta=37 degrees. The box is connected by a cord to a UPS box of mass m1=3kg on the floor. The floor, plane, and pulley are frictionless, and the masses of ...
July 6, 2010

algebra 1
Totally lost on this. Any help would be awesome! 1. The function A(t)=0.233t+5.87 can be used to estimate the median age of cars in the United States t years after 1990. (In this context, we mean that if the median age of cars is 3 yr, then half the cars are older than 3 yr ...
July 5, 2010

Physics
Vector A has a magnitude 12m and is angled at 60 degrees counterclockwise from the positive direction of the x axis of an xy coord. system. Also. Vector B = (12m)i + (8m)j on that same coord system. Rotate the system counterclockwise about the origin by 20 degrees to form an x...
June 27, 2010

math
Can someone show me the steps necessary to simplify the expression by combining like terms? 1/4(6b+2) – 2/3(3b-2)
May 17, 2010

algebra
The projected number of men and women enrolled in US colleges, in millions, is modeled in the following formulas: Women: N=0.007x+4.1 Men: N=0.01x +3.9 N represents enrollment, in millions, x years after 1984 (I left this part out last posting). What is the project enrollment ...
May 15, 2010

algebra
The projected number of men and women enrolled in US colleges, in millions, is modeled in the following formulas: Women: N=0.007x+4.1 Men: N=0.01x +3.9 N represents enrollment, in millions, x years after 1984 (I left this part out last posting). What is the project enrollment ...
May 15, 2010

algebra
I am having a lot of difficulty trying to figure out how to put two math (word problems) questions into an expression. Can someone help me, I can do the rest from there. An explanation on the math formula would be great too. here's the two questions. 1. The projected ...
May 15, 2010

algebra
Formula given: H=7+70t-16tsquared. Ball kicked straight up from a height of 7 feet. Ball travels 70 feet per second. How high is the ball after 3 seconds (t)?
May 11, 2010

Math
5a+6b/2 minus 5a+6b/2 The answer is suppose to be 6b. When I try and solve it I keep getting 0 for my answer.
May 6, 2010

Algebra
Multiply: 5p-5/p times 5p^2/8p-8
May 6, 2010

math- geometry
x^2+y^2=100
May 5, 2010

geometry
okay, if I have a square, and know the square footage-how can I find the middle of that square? I can't figure this out for the life of me.
April 6, 2010

ALGEBRA
Quadratic formula: In my opinion, this is the most general method, and likely the best overall. It will always work, and if you memorize the formula, there is no guessing about how to apply it. The formula allows you to find real and complex solutions. Graphing: graphing the ...
March 28, 2010

math
how many ounces in a cup?
March 21, 2010

Math
you are correct with both of your answers. congrats!!!
March 18, 2010

physics question
A spacecraft in the shape of a long cylinder has a length of 100 m, and its mass with occupants is 1660 kg. It has strayed too close to a black hole having a mass 103 times that of the Sun (Msun = 1.99 x 1030 kg). The nose of the spacecraft points toward the black hole, and ...
March 18, 2010

5th grade
check wikipedia
March 18, 2010

Finance
(Default risk) You buy a very risky bond that promises a 9.5% coupon and return of the $1,000 principal in 10 years. You pay only $500 for the bond. a. You receive the coupon payments for three years and the bond defaults. After liquidating the firm, the bondholders receive a ...
February 4, 2010

math
in a 4 1/2 mile relay race there were 9 runners what part of a mile did each run
January 18, 2010

ushistory
the assembly line production of henry ford's model t automobile resulted in what? my answer: it resulted in development of a large interantional marekt for american automobiles but im not sure if it was a sharp decrese in railroad passenger traffic or a construction of a ...
November 28, 2009

US HISTORY
yeah they said staunchest propoenents
November 28, 2009

US HISTORY
Who were the staunches proponents of prohibition? A. Harding, coolidge, and hoover B. organized crime figures C. rural American and small town residents D. Big city immigrants E. labor leaders and unions.. i think its A or B please help! and maybe a brief explanation.
November 28, 2009

Phyiscs
A man claims he can safely hold on to a 9.7-kg child in a head-on collision with a relative speed of 112-mi/h lasting for 0.12 s as long as he has his seat belt on. (a) Find the magnitude of the average force needed to hold onto the child. HELP
November 25, 2009

geometry
twenty feet
October 14, 2009

English
A question from Sir Knight and the Green Knight After the Green Knight addresses King Arthur and his Knights, King Arthur says, "By Heaven, Sir, your request is strange". What is the Green Knight's request?
September 19, 2009

grammar
That was the complete sentence. The odd thing is she said both shimmering and gold were adjectives. Even if she believed gold was an adjective, then shimmering would be an adverb as it modifies the 'adjective' gold. Of course what I had was shimmering (adj) and gold (...
September 16, 2009

grammar
In the sentence.........His hair is the color of shimmering gold.........what part of speech is gold? The teacher said it was an adjective but I believe it is a noun
September 16, 2009

vocab
What is a set of claims intended to support or prove a conclusion?
August 14, 2009

spanish
I need to write 10 facts about the history of lima peru and so I was wondering if someone could check my grammar. Each english line is followed by my spanish translation. Please check to see that they are correct. On October 28, 1746, a powerful earthquake severely damaged the...
May 14, 2009

biology
Which organ sterilizes ingested food? A. Salivary glands C. Pancreas B. Stomach D. Liver (B)
March 26, 2009

chem
a solution that is 0.51 M CH3COOH and 0.28 M CH3COONa is that a buffer? when can u tell when to us the henderson hasslebach
March 6, 2009

trig
please simplify sin (7pi/6 -x) + cos (2pi +x)
March 5, 2009

simplify w/radicals
(3+4root(15))/(4-3root(15)) please show me your work
March 5, 2009

in/out function rule
this is a sped class. how or how is easiest to teach them?
November 18, 2008

history
What did George Washington and Thomas Jefferson contribute in establishing a stable government after the adoption of the Constitution? For Washington I have: 1) He became first president for 8 years 2) Proclamation of Neutrality protected Americans from war 3) Jay Treaty ...
November 13, 2008

AP BIOLOGY LAB
I found that each cuvette contained equal amounts of photosynthesis when the ultra-fertilizer is added to the solution, thus creating super-photosynthesis. Without the fertilizer only regular photosynthesis would occur and then nothing happens because no one really cares about...
November 2, 2008

physics
still dont understand where does wavelength and number of photons go too? do you divdide them to get energy or what?
April 16, 2008

physics
A laser emits 1.44*10^18 photons per second in a beam of light that has a diameter of 1.98 mm and a wavelength of 524.5 nm. (a) Determine the average electric field strength (b) Determine the average magnetic field strength for the electromagnetic wave that constitutes the beam.
April 16, 2008

physics
An electron and a positron each have a mass of 9.11*10^-31 kg. They collide and both vanish, with only electromagnetic radiation appearing after the collision. If each particle is moving at a speed of 0.55c relative to the laboratory before the collision, determine the energy ...
April 15, 2008

physics
An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^-13 W/m2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 7.0 mm and the light has a wavelength of 545 nm?
April 14, 2008

physics
A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.5 s. A person on earth measures that the time between flashes is 2.9 s. How fast is the "police car" moving relative to the earth?
April 14, 2008

physics
From a distance of 60 m, a photographer uses a telephoto lens (f = 300.0 mm) to take a picture of a charging rhinoceros. How far from the rhinoceros would the photographer have to be to record an image of the same size using a lens whose focal length is 45.0 mm?
March 24, 2008

physics
A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. A woman whose height is 1.80 m stands 7.00 m in front of the camera. What is the height (including sign) of her image on the film, as produced by (a) the 35.0-mm lens (b) the 150.0...
March 24, 2008

physics
A person stands 4.4 m in front of a wall that is covered floor-to-ceiling with a plane mirror. His eyes are 1.9 m above the floor. He holds a flashlight between his feet and manages to point it at the mirror. At what angle of incidence must the light strike the mirror so the ...
March 20, 2008

decimals
1.0 X 21 = 21 or 210 because of the decimal point, I just don't remenber how the decimal point works.
March 10, 2008

decimal
1.0 X 21 = 21 or 210 because of the decimal point. I just don't remember how it works ?.
March 10, 2008

decimal
21 or 210
March 10, 2008

decimal
1.0 X 21 =
March 10, 2008

physics
The human eye is most sensitive to light having a frequency of about 5.3*10^14 Hz, which is in the yellow-green region of the electromagnetic spectrum. How many wavelengths of this light can fit across the width of your thumb, a distance of about 2.0 cm?
March 5, 2008

physics
In astronomy, distances are often expressed in light-years. One light-year is the distance traveled by light in one year. The distance to Alpha Centauri, the closest star other than our own sun that can be seen by the naked eye, is 4.7 light-years. Express this distance in ...
March 3, 2008

trig
8 sin 9x cos3x Rewrite the xpression as a sum or differnce using one of the product sum formulas Simplify if possible
February 28, 2008

trig
Prove the identity sin squared 0 with line/2 = csc zero with line -cot zero with a line /2csc zero with a line
February 28, 2008

trig
Use half-angle formulas to find the exact value for the following cot 75 degrees
February 28, 2008

trig
Graph the followiing function from x + 0 to x = 4 pi y = 3 cos squared x/2
February 28, 2008

trig
If cos A =1/3 with A in QIV find cscA/2
February 28, 2008

trig
Prove the identity sin(3 pi /2 + x) + sin(3pi/2 -x) = -2cosx
February 28, 2008

trig
If tan(A+B) = 2 and tan B =1/3, find tan A
February 28, 2008

trig
Graph one complete cycle of y + cos x cos pi over6 + sin x sin pi/6 by first rewriting the right side in the form cos(A-B)
February 28, 2008

trig
Graph the following from X = 0 to x = 2 pi 2cos 6x cos4x + 2 sin 6x sin 4x
February 28, 2008

trig
Prove the identity sin (3 pi/2 + x) + sin (3 pi/2 -x) = -2 cos x
February 26, 2008

trig
If sin = -3/5 with A in QIV, find cos A/2
February 26, 2008

trig
If sin = 4/5 with A in QII, and sin B = -3/5 with B in QIV find cos(A-B)
February 26, 2008

physics
A generating station is producing 1.3*10^6 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.0*10^-2 /km. (a) Find the power lost in heating the wires if ...
February 20, 2008

physics
Suppose you wish to make a solenoid whose self-inductance is 3.0 mH. The inductor is to have a cross-sectional area of 2.0*10^-3 m2 and a length of 0.052 m. How many turns of wire are needed?
February 16, 2008

physics
The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.5 m. The magnetic field of the generator is 0.10 T, and the coil rotates at an angular speed of 25 rad/s. What is the peak emf of this generator?
February 15, 2008

physics
The average emf induced in the secondary coil is 0.10 V when the current in the primary coil changes from 3.2 to 2.0 A in 0.10 s. What is the mutual inductance of the coils?
February 13, 2008

physics
A piece of copper wire has a resistance per unit length of 6.45*10-3 /m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.140 m. The ends of the wire are connected to a 12.0 V battery. Find the magnetic field strength at the center of the coil.
February 11, 2008

physics
In a lightning bolt, 13 C of charge flows in a time of 1.5*10-3 s. Assuming that the lightning bolt can be represented as a long, straight line of current, what is the magnitude of the magnetic field at a distance of 29 m from the bolt?
February 11, 2008

physics
An electric power line carries a current of 1600 A in a location where the earth's magnetic field is 4.0*10-5 T. The line makes an angle of 75° with respect to the field. Determine the magnitude of the magnetic force on a 130 m length of line.
February 10, 2008

physics
There is a 0.225 T magnetic field directed along the +x axis and a field of unknown magnitude along the +y axis. A particle carrying a charge of 7.20 10-5 C experiences a maximum force of 0.455 N when traveling at a speed of 2 104 m/s through the region where the fields are. ...
February 10, 2008

physics
still dont understand where the 20.8V comes into it how u get that?
January 30, 2008

physics
The average power dissipated in a stereo speaker is 54 W. Assuming that the speaker can be treated as a 4.0- resistance, find the peak value of the ac voltage applied to the speaker.
January 30, 2008

physics
where are you getting 22.95% and what is delta T
January 30, 2008

physics
A toaster uses a Nichrome heating wire. When the toaster is turned on at 20°C, the initial current is 1.50 A. A few seconds later, the toaster warms up and the current has a value of 1.22 A. The average temperature coefficient of resistivity for Nichrome wire is 4.5 10-4 (...
January 30, 2008

physics
A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing. What is the total charge (in coulombs) that this battery can provide? Determine the maximum current ...
January 30, 2008

physics
A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing.
January 30, 2008

physics
An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.11 10-11m. What is EPEfinal - EPEinitial, which is the ...
January 30, 2008

Physics
i dont know what you mean about the charge of the electron? or what number do you times it by.
January 24, 2008

Physics
How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?
January 24, 2008

math
wat is 45x320?
December 4, 2007

algebra
find the average weight in pounds of a type of bird of your choice. Use the rational exponent equation L = 2.43 * W^0.3326 to estimate the wingspan L in feet of the bird that weighs W pounds show the average weight. How do I show the calculations necessary to find the ...
December 1, 2007

Math permutations
pi=(245)(1354)(125) 1) Write as a product of disjoint cycles. Ans: (14)(253) Is this correct? 2) Solve : pi^2, pi^5,pi^(-1) 3) What's the order of pi? and why?
November 24, 2007

Quantiative Methods
rfdf d fd fd f
November 10, 2007

elementary math
How do you add decimals with partial sums?
September 30, 2007

algebra
write equation of line that passes through P(0,0) and is parallel to given line, x=8y-16, answer in slope intersect form.
September 16, 2007

ETH125
United States-Centric Views Comparison • Resource: Appendix D Did you have this in your studies.Give a copy of Appendix D to a friend or family member and ask that person to complete the table contained therein. In doing so, your chosen participant will consider what he ...
August 9, 2007

Pseudocode programming
I need a currency conversion application. It does not have to be written in an actual programming language, just the pseudocode as well as the elements listed below. Complete requirements analysis Design Verification Validation and test documentation The Currency Conversion ...
July 24, 2007

BUSINESS
C (introducing a new concept
April 13, 2007

math function rule input/output
how do you figure out and what is the easiest way to teach it.
March 21, 2007

Sociology
What are the features of Sociology that distinguish it from everyday speculation on social life?Why did they emerge at the time they did in the 19 th century? This site has some good answers to your first question. http://en.wikipedia.org/wiki/Sociology I don't know who ...
March 13, 2007

ALGEBRA2
100Y^2-4Z^2 What is the problem? Factor? It is a difference of two squares.
February 8, 2007

Chem II
2.5 mol NOCl(g) was placed in a 2.50 L reaction vessel at 400 degrees C. After equilibrium was established, it was found that 28% of the NOCl had dissociated according to the equation: 2NOCl(g)<-->2NO(g)+Cl2(g) Calculate the equilibrium constant, Kc, for the reaction. ...
January 30, 2007

science
tell me about science apparatus They are used in science. You need a much more specific question to get a useful answer. For instance: What is the Hoffman apparatus, and how is it used?
January 28, 2007

Please correct sentence
Although telephones companies always need to build more towers to fulfill the increasing demand for cell phone service.
January 10, 2007

Pigskin Geography
(week 15) identify the state capitals in which a game will be played? Which games? When? Please give us more information so that we can help you.
December 11, 2006

Probability
New York’s MEGAMILLIONS lottery, a player wins 1st prize by selecting the correct 5 number combination when 5 different numbers from 1 through 56 are drawn, then selecting the correct MEGABALL number drawn from numbers 1 through 40. If a player selects one particular ...
November 6, 2006

Eyh125
I am in Eth 125 and I really do not like this class
July 20, 2006

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