Friday
December 19, 2014

Posts by Riley


Total # Posts: 263

Chem
No clue what to do part of my lab
November 11, 2014

Chem
Find the exerted pressure in kpa Volume=0.05L Mass=5 Atmospheric pressure =764mm Hg Temperature=21degree Celsius Cross sectional area plunger 5.3 x10-4
November 11, 2014

Algebra
X-3y=9 2x-y=-2
October 21, 2014

c programming
a student designed a program to accept the age of an employee and then compute the employees retirement year and display the same in a statement on the screen required. a) write out the pseudo-code for the program above b) write the algorithm, c) flowchart d) write the program...
October 14, 2014

Math
This is a bonus question. If the modes of a problem are13 and15 and the mean and the median are 15 how do you come up with the other numbers
September 30, 2014

English/language arts
Thank you!
September 24, 2014

English/language arts
That orange deposit
September 24, 2014

English/language arts
What is the complete subject in the sentence That orange deposit on the outside surface is called rust.
September 24, 2014

Algebra
A new set of car tires has a tread depth of 8 millileters. The tread depth decreases 0.12 millimeter per thousand miles driven. Write an equation that gives the tread depth as a function of the distance driven. Then predict what distance the tread depth will be 2 millimeters
September 23, 2014

CAN SOMEONE HELP ME UNDERSTAND AND SHOW HOW TO DO THIS.tHX!
hELLO?
September 23, 2014

Physics
Two forces are applied to a car in an effort to move it, as shown in the following figure (cannot attach picture), where F1 = 416 N, 10 degrees to the left of north and F2 = 356 N, 30 degrees to the right of north. What is the sum of these two forces acting on the car? ...
September 12, 2014

Civics
Explain how federal income taxes support the economy and benefit the common good. I have to have at least one well-developed paragraph, and this question is worth 10 points which is why I need help!!
June 11, 2014

Math
Which of the following transformations will never produce a congruent figure? A. rotation B. reflection C. translation D. dilation <------
May 22, 2014

Math
1)Let AB be the directed line segment beginning at point A(1 , 1) and ending at point B(-4 , 6). Find the point P on the line segment that partitions the line segment into the segments AP and PB at a ratio of 5:1. A)(-3 1/6,5 1/6) B)(1/6,1 5/6) <---- C)(-3 4/5,31) D)(-2 1/6...
May 22, 2014

Math
Use experimental probability to make a prediction. John made 35 free throws and missed 15. Predict the number of free throws he will make in the next 100 tries. A. 70 B. 85 C. 55 D. 45
May 2, 2014

Physics
A rope is used to pull a 5.19 kg block at constant speed 3.38 m along a horizontal floor. The force on the block from the rope is 3.23 N and directed 20.0° above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the ...
March 10, 2014

Physics
A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.8 cm. How much work is done (a) by the block on the spring and (b...
March 10, 2014

Physics
Okay. So I got 2356J is that right?
February 3, 2014

Physics
Damon, this is my last question for today for you. Thanks for all your help. A gas is at an initial pressure of 1.24104 Pa and occupies a volume of 0.28 m3. The (slow) addition of 23,570 cal of heat to the system causes it to expand in an isobaric manner to a volume of 0.47 m3...
February 3, 2014

Physics
An ideal monatomic gas goes from p1 = 180 atm and V1 = 45 m3 to p2 and V2 through an adiabatic process. If p2 = 60 atm, what is V2?
February 3, 2014

Physics
An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at 266°C. What is its efficiency as a percentage?
February 3, 2014

Global Studies (check please)
1) B 2) D 3) D
February 3, 2014

Physics
A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)
February 3, 2014

Physics
5.4377 was my final answer and that was right.
February 3, 2014

Physics
I figured it out.
February 3, 2014

Physics
How much (in Celsius degrees) is the temperature of 1.3 kg of alcohol raised by adding 4.1 kcal of heat? The following piece of information may come in handy: specific heat of alcohol is 0.58 kcal/kgC.
February 3, 2014

Physics
An aluminum calorimetry cup [mc = 0.6 kg, cc = 0.22 kcal/(kgC)] is filled with water [mw = 2.4 kg, cw = 1 kcal/(kgC)]. It is at a temperature of 30C. A sample of an unknown substance with mass mm = 2.34 kg, originally at a temperature of 210C, is added. After a while, the ...
February 3, 2014

Physics
A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift.
January 31, 2014

Physics
Help?
January 31, 2014

Physics
A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift. Not sure how to answer this.
January 31, 2014

Physics
I can figure it out. Thanks for your help
January 17, 2014

Physics
A gas cylinder of volume 26 liters contains an ideal gas at temperature 27 degrees C and pressure 1920 kPa. Some of the gas leaks until the pressure falls to 1500 kPa. How many moles of gas leaked, assuming that the temperature remains constant during this process?
January 17, 2014

Physics
A can of gasoline has a rectangular base with dimensions of 13.5 cm by 13 cm. If there are 3 liters of gasoline in the can, how much does the surface of the gasoline rise (in mm) in the can when the temperature is raised by 45C? The coefficient for volume expansion of gasoline...
January 17, 2014

Physics
I got .13172 m is that correct?
January 17, 2014

Physics
By what amount will a 178 m long concrete slab on the Mackinac Bridge contract when going from +39C to -35C? The linear expansion coefficient is 10^-5 per C.
January 17, 2014

English !!!
dont have choices its fill in the blank
November 20, 2013

English !!!
To find out which key will open a lock, you try several until one works. This kind of learning is called ________________________.
November 20, 2013

Physics
My only question is how to find the speed of the particles
November 14, 2013

Physics
Thank you so much! I got 22.61x10^-21 is that right?
November 14, 2013

Physics
1. A gold atom has a mass of 3.287 • 10-25 kg and is at rest. It emits an alpha particle that has a mass of 6.646 • 10-27 kg. In this process, the gold atom is transformed into an iridium isotope. The alpha particle has a speed of 3.40 • 106 m/s. A. What is the ...
November 14, 2013

Calculus-Applied Optimization Quiz Problem
A rancher wants to fence in a rectangular area of 23000 square feet in a field and then divide the region in half with a fence down the middle parallel to one side. What is the smallest length of fencing that will be required to do this?
October 31, 2013

Physics
A 67.0 kg astronaut on the planet Zircon (mass = 1.15 x 1023 kg and radius = 2.00 x 106 m) tosses a 8.00 g frog astronaut (a frogonaut?) horizontally with a speed of 7.45 m/s. The 8.00 g frog falls through a vertical distance of 1.40 m and lands a horizontal distance of 8.05 m...
September 5, 2013

physics
An archer shoots a 54.6 g arrow horizontally at a target 14.0 m away. The arrow is 18.0 inches long. The 54.6 g arrow is aimed directly at the center of the target, but it hits 60.0 cm lower. What was the initial speed of the arrow? (Neglect air resistance.)
September 5, 2013

Math
1/8(2sin2x-sin4x)= cosxsin^3x prove
June 19, 2013

Biochemistry
Calculate the ATPs resulting from the total oxidation of the following compounds: a. Fructose-6-phosphate b. 3-Phosphoglycerate c. Succinyl-CoA d. Stearic acid How do I begin?
April 28, 2013

Biochemistry
Based on free energies of hydrolysisgiven below, for each of the followingreactions: i)Determine the overall ∆G of thereaction ii)State whether it is favorable...
April 18, 2013

calculus
The demand function for a certain make of replacement cartridges for a water purifier is given by the following equation where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. p=-0.01x^2-0.3x+19 Determine the consumers&#...
April 10, 2013

language arts
The answer is B you can tell from the context clues since the sentence refers to a scientist that would be a guest speaker. From this you can deduce that this person is going to do a sort of lecture which usually involves speech and writing. Reasons why other answers are wrong...
April 9, 2013

calculus
The demand function for a certain make of replacement cartridges for a water purifier is given by the following equation where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. -0.01x^2-0.3x+19 Determine the consumers'...
March 16, 2013

Chemistry
is Fe3O4 + 4H2 = 3Fe + 4H2O spontaneous at 298 K? Delta H system= 149.8 kj/mol Delta S system= 610.0 kj/mol
March 5, 2013

science
How to do homework on soil erosion and soil conservation ?
February 13, 2013

Math trigonometry
Prove sinA/1+cosA =tan1/2A
January 24, 2013

Math
Find in terms of trigonometric function of x Tan(90° + x)
January 19, 2013

Health
The ________the concentration of HIV in semen or genital fluids, the more likely it is that HIV will be transmitted to a sex partner?
January 17, 2013

Integration
∫ sin2xcos3x dx using factor formula
January 8, 2013

Trigonometry
Prove 1-cosx+sinx / 1+cosx+sinx =tan x/2
January 8, 2013

Physics
Im looking for the same thing
December 11, 2012

physical science help please!
If a sample emits 1000 counts per second when the detector is 1 meter from the sample, how many counts per second would be observed when the detector is 2 meters from the sample?
December 5, 2012

Chemisty
how many mole of calcium sulfate are in a 100mL of .86M solution?
November 26, 2012

english
What is the verb (linking or action) in "Long ago, farmers milked cows by hand"
November 14, 2012

4th grade math
ugh, thank you so much! I was not thinking hard enough.
October 9, 2012

4th grade math
Can't divide by 8 either, so I am stuck. This problem was on my actual homework today.
October 9, 2012

4th grade math
I am a 2 digit number. You can divide me by every single digit except for 5 and 7. Add my digits together and the sum is 9. What number am I?
October 9, 2012

Spanish Check
Vamos a... Form sentences using the following information. Use ir a + infinitive in each sentence to express what the subject is going to do. Follow the model closely. 1.Leonardo / trabajar / las tres de la tarde -Leonardo está estudia las tres de la tarde 2. Marí...
October 4, 2012

MATH, Calc
P=0.3e^0.08t find the rate of growth.
September 13, 2012

physics
IP A jogger runs with a speed of 3.10{\rm m/s} in a direction 25.0{^\circ} above the x axis. Find the x and y components of the jogger's velocity.
September 11, 2012

math
I'm doing a unit on volume and surface area. So there's a diagram that shows a fish tank after a container of water is poured into the tank. How many containers of water are needed to fill the tank? What is the formula to finding this?
May 10, 2012

Eng.
Given that she previously belonged to high society and that later she had to move to a trailer park, she did not like to mix with the rif-raff in the park. What part of speech is GIVEN in this sentence.
March 22, 2012

Chemistry
You found an unknown metal sample shaped as a cube with each side measuring 2.00 cm. The cube's mass is 48.0 . Your colleague examined the mystery cube with X-ray diffraction and told you that it contains just one element arranged in a body-centered-cubic -lattice, and ...
March 18, 2012

Chemistry
there's a part c that I didn't know how to do either... c) Calculate the actual percent yield of Fe2O3(s)
March 18, 2012

Chemistry
A 500g iron (Fe) rod was left in air for a long period of time, and got covered with rust (Fe2O3) as a result of reaction with atmospheric oxygen. The mass of the rusty rod was determined as 560g. a) calculate the theoretical yield of Fe2O3(s), that is the mass of Fe2O3(s) ...
March 18, 2012

Chemistry
For the following reaction, the equilibrium constant KC = 97.0 at 900 K. If the initial concentrations of NH3 and H2S are both 0.20 M, what is the equilibrium concentration of H2S? H2S (g) + NH3 (g) ---> NH4HS (s)
March 18, 2012

Chemistry
Thanks! I understand! You are the best :D
March 18, 2012

Chemistry
Okay so why is there a 1 here: Kc = 97.0 = 1/[(0.2-x)(0.2-x)] where did you get the 1 from? Also in this equation: H2S (g) + NH3 (g) ---> NH4HS (s) What if there was a 2 in front of the NH4HS(s)...would that make it a 2 in place of the one? So for example: Kc = 97.0 = 2/[(0...
March 18, 2012

Chemistry
initial....0.2......0.2.........0 change.....-x........-x..........x equil....0.2-x...0.2-x............ equil....0.2-x...0.2-x............ <----what goes here Did you forget to put an x?????
March 18, 2012

Chemistry
Ummmmm I'm waiting to confirm this with DrBob222...Thanks anyways ;D
March 18, 2012

Chemistry
Now what do I do next once I have the ice table?
March 18, 2012

Chemistry
Wait is this right? I: (0.2) (0.2) (0) C: (-x) (-x) (x) E: (0.2-x) (0.2-x) (x)
March 18, 2012

Chemistry
Wait is this right? I: 0.2 0.2 0 C: -x -x x E: 0.2-x 0.2-x x
March 18, 2012

Chemistry
Could you help me on the ice table..........I could only get the I part :( I: 0.2 0.2 0
March 18, 2012

Chemistry
For the following reaction, the equilibrium constant KC = 97.0 at 900 K. If the initial concentrations of NH3 and H2S are both 0.20 M, what is the equilibrium concentration of H2S? H2S (g) + NH3 (g) ---> NH4HS (s)
March 18, 2012

chemistry
Yes that is what I thought! Thank you! :)
March 18, 2012

chemistry
A saturated solution is prepared by dissolving 3.2 g of a salt in 9.10 g of water to yield a saturated solution. What is the solubility of the salt (in g salt/100g of H2O)?
March 18, 2012

Chemistry
Ohhh yeahh haha thanks DrBob222! I really appreciate it! :D
March 18, 2012

Chemistry
I got an answer of 8.02...is this right? :)
March 18, 2012

Chemistry
1.00 g of sodium is added to a large excess of water under conditions of constant pressure (1.00 atm) and constant temperature (25 °C ). The following reaction occurs: 2Na (s) +2H2O (l)------> 2NaOH (aq) +H2(g) Delta H°rxn =-369 kJ/mol Calculate the heat released ...
March 18, 2012

physics
70mtr
February 26, 2012

English
"shame is five-fingered.” IS THE METAPHOR..
February 25, 2012

English
Read the following passage by Picoult and identify the metaphor. Quote the metaphor in your response and explain what makes it fit the definition of metaphor. “My mother moves so fast I do not even see it coming. But she slaps my face hard enough to make my head snap ...
February 25, 2012

physics
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 79.1 kg man just before contact with the ground has a speed of 6.27 m/s. In a stiff-legged landing...
February 23, 2012

physics please help
A 690 kg elevator starts from rest. It moves upward for 2.56 s with constant acceleration until it reaches its cruising speed, 1.84 m/s. What is the average power of the elevator motor during this period? What is the power of the elevator motor during an upward cruise with ...
February 20, 2012

Physics
A 2.5 kg block of ice at a temperature of 0C and an initial speed of 5.7 m/s slides across a level floor. If 3.3*10^5 J are required to melt 1.0 kg of ice, how much ice melts, assuming that the initial kinetic energy of the ice block id entirely converted to the ice's ...
February 20, 2012

language arts
Where is the comma needed in the sentence? After traveling to Bryce Canyon, Utah, Karen drove to Canyonlands National Park, Utah, where she took pictures of the sandstone formation. I put in the commas already, I just want to know if this is correct because I'm not sure.
January 29, 2012

Physics
An airline pilot pulls her 12.0 kg rollaboard suitcase along the ground with a force of 25.0 N for 10.0 meters. The handle she pulls on makes an angle of 42.5 degrees with the horizontal. How much work does she do over the ten-meter distance? Tried doing: (Cos(42.5) * 25N) * ...
January 12, 2012

Physics
A hockey stick applies a constant force over a distance of 0.127 m to an initially stationary puck, of mass 152 g. The puck moves with a speed of 51.0 m/s. With what force did the hockey stick strike the puck?
January 12, 2012

Math
We already asked if there was a driver or anyone else. He said no. He wasn't trying to trick us or anything.
January 5, 2012

Math
I thought so, but he said it was close but not exact.
January 5, 2012

Math
Math. The girls are on the bus!! And the cats are inside their backpacks. I don't know, it's confusing though. Thanks for trying though!
January 5, 2012

Math
I did too? I don't think that it is supposed to be a trick question like that though!
January 5, 2012

Math
How did you get that answer?
January 5, 2012

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