Tuesday
September 16, 2014

# Posts by jason

Total # Posts: 1,090

Calculus
When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV1.4=C where C is a constant. Suppose that at a certain instant the volume is 470 cubic centimeters and the pressure is 89 kPa and is decreasing at a rate ...
October 26, 2010

Physical Science
an airplane is flying at 600km/h at an altitude of 2.0km. When the sound of the airplane's engines seems to someone on the ground to be coming from directly overhead, how far away is she from being directly below the airplane?
October 26, 2010

Chem
Would you please tell me if these are right? A sample of helium has a volume of 325 ml and a pressure of 655 mm hg. What will be the pressure if the helium is compressed to 125 ml (t and n are constant) I got 1703 mm of Hg A 75.0 ml sample of oxygen has a pressure of 1.50 atm...
October 23, 2010

Chem
Please tell me if these are right. How many grams are needed to obtain 1.5 moles of magnesium oxide? I got 60grams is this right? Write a balanced equation for the reaction of the magnesium and the oxygen including their physical states. I got 2Mg=Mg2+O2? Thank You!
October 23, 2010

english
In the answer area below, write the conjunction in the following sentence. Sentence: Give it to the boy or his mother. This doesn't seem like it should be difficult, but I want to make sure I understand. Is 'or' the conjunction?
October 22, 2010

Chemistry
Can you tell me if these are right please? When 2.50g of copper reacts with oxygen the copper oxide product has a mass of 2.81g. What is the simplest formula of the copper oxide. I got Cu2O (copper (I) oxide). Aluminum and oxygen gas react to produce aluminum oxide. A.) write ...
October 19, 2010

english
In the answer area below, write the 2 adverbs in this sentence and explain how each adverb is used. Example: Eventually, she walked proudly. Answer: eventually - eventually tells when she walked ; proudly - proudly tells how she walked Sentence: She walked very slowly into the...
October 19, 2010

english
List the nouns in the following sentence. Next to each noun - label whether it is concrete or abstract by writing a "C" or an "A." Sentence: In the midst of the excitement, Samuel lost his pencil on the bus. This is what I believe to be correct: excitement-...
October 19, 2010

Physics #2
A car can decelerate at -3.40 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 14° uphill? Assume the same static friction coefficient.
October 11, 2010

Physics
Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
October 11, 2010

Physics
Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
October 11, 2010

algebra
Two planes are 1,400 miles apart. They fly towards each other, one at 125 mph and the other at 175 mph. How long does it take the planes to pass each other (round to the nearest hundredth)?
October 9, 2010

physics
A cheetah is hunting. Its prey runs for 3.21 s at a constant velocity of +8.36 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time?
October 8, 2010

physicS
so thatd be H=dSin17.2 40.45m=dsin17.2 d=40.45/sin17.2 d=136.8 it all looks right, but for some reason incorrect, if anyone has a chance, can you check my math for me? i cant understand where i went wrong
October 8, 2010

physicS
A skier is gliding along at 6.93 m/s on horizontal, frictionless snow. He suddenly starts down a 17.2° incline. His speed at the bottom is 29.7 m/s. What is the length of the incline? i understand that the equation used is gH= change in (v^2)/2 so i plug in 9.8H=(29.7^2-6....
October 8, 2010

college statistics
In Chapter 5, Exercise 9, we studied the variability of crime rates and police expenditures in the eastern and Midwestern United States. We’ve now been asked to investigate the hypothesis that the number of crimes is related to police expenditures per capita because ...
October 6, 2010

Projectile Motion Physics
An Arrow directed at a stationary target is shot at an angle of E25N. The arrow hits the intended target at the same height from which it is launched, 3.0s later. Determine the distance from the archer to the target.
October 6, 2010

fine the rule
September 27, 2010

math
find the decimal notation for 63/3/8
September 25, 2010

physics
An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed? If this speed were increased by just 5.0%, how much longer would the jump be? I came up with a take off speed of 27.4 but the system is saying that is ...
September 22, 2010

math
nvm you dont have to answer this. i was told the wrong problem.
September 20, 2010

math
my friend asked me how to do this probelm and i could not figure it out for the live of me. its simple im pretty sure. (6-5i)/(6+5i) I tried using the conjugate method and my answer did not come out correct. can you please answer this?
September 20, 2010

Chemistry
A 0.25g sample of a pretzel is burned. The heat it gives of is used to heat 50.g of water from 18 to 42 degrees C. what is the caloric value of the pretzel in kcal/g? Can someone walk me through step by step?
September 18, 2010

Chemistry
175g of water was heated fro 15 to 88 degrees C. how many kilocalories were absorbed by the water? I got 94.5 kcal. Is this right?
September 18, 2010

Chemistry. can jus anyone giv me ther opinion.
idk this is the question to a quiz im taking i askd my teacher and he didnt even kno what to say i think its D and i jus need to get this question rite and ill pass but if i miss it then i fail. i jus want as much help as i can get.
September 17, 2010

Chemistry. can jus anyone giv me ther opinion.
Eva has two containers labeled A and B. The diameter of container A is 8 inches and the diameter of container B is 12 inches. If Eva pours the water from container A into container B, which will occur...
September 17, 2010

English
its talking about not quite understanding maturity in which a young person grows up to become an adult. for some its like watking thru a doorway and for others it seems they can't even get the door open.
September 17, 2010

Chemistry...HELP!!!!
In a reaction in which A + B yields AB, the reaction is referred to as a _________. A. decomposition reaction B. double-replacement reaction C. combustion reaction D. composition reaction i think is a
September 17, 2010

Chemistry
In a reaction in which A + B yields AB, the reaction is referred to as a _________. A. decomposition reaction B. double-replacement reaction C. combustion reaction D. composition reaction
September 17, 2010

Economics
Why has China begun an economic shift towards a free enterprise system?
September 16, 2010

High school economics
Where might you take someone from China or Cuba to show them the differences between the economy in the US and their country?
September 16, 2010

Chemistry, Solutions
Two or more combined substances that do not react form a _________. solution mixture substance compound
September 16, 2010

Chemistry
What types of elements are involved in metallic bonding? A. noble gases B. metals and non-metals C. non-metals only D. metals only
September 16, 2010

Chemistry
Acids and bases react with one another to form compounds called ______? A. salts B. ions C. mixtures D. salts, ions, and mixtures
September 16, 2010

Math - polynomial function
Write a polynomial function with integral coefficients having the given roots. 1.) 0, -1/2, 6 2.) +or- 5i
September 12, 2010

College Algebra
suppose that the area of a square is six times its perimeter. find the length of a side of the square
September 12, 2010

Science
What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius?
September 10, 2010

chemistry
how to balance ZnO+2HCl yields ZnCl2+H2O
September 8, 2010

math
Hoshi walk 10 meters in 3 sec. a. what is her walking rate? b. at this rate how long does it take to walk 100 meters c. suppose she walks the same rate for 50 sec. how far does she walk d. wright an equation that represents the distance D that Hoshi walks in 1 sec
September 2, 2010

The Question that was not answered. (twice)
What are the four basic levels of ecological study, and what is the focus of inquiry at each of these levels? I don't know what it's asking to start with and can't find anything relevant online, in my textbook or in my study guide! Since it says levels, I think it ...
August 28, 2010

bio
What are the four basic levels of ecological study, and what is the focus of inquiry at each of these levels? I don't know what it's asking to start with and can't find anything relevant online, in my textbook or in my study guide! Since it says levels, I think it ...
August 28, 2010

Chemistry
sources of error can include human errors made by you during the experimentation or your surroundings which may have affected your outcome.
August 28, 2010

AP Biology
What are the four basic levels of ecological study, and what is the focus of inquiry at each of these levels? I don't know what it's asking to start with and can't find anything relevant online, in my textbook or in my study guide! Since it says levels, I think it ...
August 28, 2010

Math
haha sorry. i didn't bother to read the entire thing. you must divide first in order to root both sides
August 28, 2010

Math
Please excuse my dear aunt sally
August 28, 2010

Math
Show that the transformation T:R^2->R^2 given T(x1,x2)=(3x1-5x2,x1+2x2) is linear by verifying that satisfies the defination of linear.
August 13, 2010

Linear Alebra
Show that the transformation T:R^2->R^2 given T(x1,x2)=(3x1-5x2,x1+2x2) is linear by verifying that satisfies the defination of linear.
August 13, 2010

Algebra
For what real number k does 3x^2  k factor as 3(x  2)(x + 2)? Can someone please help with this question? I can not understand how it says to solve this in the book
August 5, 2010

British Literature
what is number 4?
July 21, 2010

MATH HELP
any points: I can use (2,6) or (10,70)?
July 20, 2010

MATH HELP
1. Consider the following. f(x)=8x-10 g(x)=x^2-4x+10 (a) Find the points of intersection of the graphs. ANSWER:(2,6) are the smaller values and (10,70) are the larder values (b) Compute the area of the region below the graph of f and above the graph or g. How do I answer part b?
July 20, 2010

programming
I am in a beginners class in computer programming and we have been designing our programs in pseudocode format and this is a homework question I have to solve this is how the question is written on my paper...can you please help, Thanks. Homework question: A car's miles-...
July 10, 2010

programming
I am in a beginners class in computer programming and we have been designing our programs in pseudocode format and this is a homework question I have to solve this is how the question is written on my paper...can you please help, Thanks. Homework question: A car's miles-...
July 10, 2010

programming
I am in a beginners class in computer programming and we have been designing our programs in pseudocode format and this is a homework question I have to solve this is how the question is written on my paper...can you please help, Thanks. Homework question: A car's miles-...
July 10, 2010

chem
A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from
July 10, 2010

MATH
Evaluate the indefinite integral. (Use theta for ƒÆ.) ç(8ƒÆ + cos(7ƒÆ))dƒÆ Ans: blank + C C is constant. How do I evaluate it?
July 1, 2010

Math
Find the general antiderivative of f (x) and check your answer by differentiating. f(x) = x^5 + 9 Need Help.
July 1, 2010

Math
Use the following table of values to estimate the area under the graph of f(x) over [0, 1] by computing the average of R5 and L5. Table: x: 0 0.2 0.4 0.6 0.8 1 f(x): 51 48 46 43 41 38 I need help with this problem.
July 1, 2010

alg
The answer would be D. 1. (2/x-1)-3/4= (5/x-1) -(2/x-1) -(2/x-1) 2. -3/4=(3/x-1) 3. (x-1)-3/4= 3 (distribute and you'll get #4.) 4. -3/4x+3/4=3 5.-3/4x= 3-3/4 6. -3/4x= 2.25 7. 2.25/(-3/4) x= -3
July 1, 2010

physics
a ring rotates ar 30rad/s and has a radius of 3m and a mass 0f 100kg. If a disk(mass=40kg and with a radius of 4m) is dropped on the ring so the centers are aligned, what will be the resulting rotational speed of the ring-disc combination?
June 29, 2010

Calculus
at the end when you get dy/dx = 20/(5x+4y -16) ... what do you replace y with? in the beginning you have y = 4ln(5x+4y) the answer is only in terms of x...
June 19, 2010

Calculus
If f(x) = 4ln(5 x+ 4ln(x)), find f'( x ).
June 19, 2010

statistics
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking-even if they are not exposed to the usual pattern of sunlight. To test this...
May 29, 2010

math
500 acres of land costs 800 dollars and every year there is a three percent increase in price then it gives the end cost was one thousand. it asks for the equation using v=p(1+r) raised to the n power
May 25, 2010

math
A certain number changes from 200 to 900 within three hours find the vaulue of k using the formula n times e raised to k times t
May 25, 2010

Physics
that isn't right either but i guess this thing is retarded so w.e thx though
May 8, 2010

Physics
A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is an isothermal (constant temperature) ...
May 8, 2010

Physics difficult... chris help again plz.
A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is an isothermal (constant temperature) ...
May 8, 2010

Physics
this isn't the right answer either
May 7, 2010

Physics
A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is an isothermal (constant temperature) ...
May 7, 2010

science
Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...
April 28, 2010

physics
A physics student sits by the open window on a train moving at 25 m/sec towards the east. Her boyfriend is standing on the station platform, sadly watching her leave. When the train is 150 meters form the station, it emits a whistle at a frequency of 3000 Hz. What is the ...
April 21, 2010

PHYSICS
A 16 kg block slides down a 30 degree frictionless incline where it is stopped by a strong Hook's Law spring at the bottom. The spring constant is k = 9.8 x10^4 N/m. If the block slides 9 m from the point where it was released (from rest) to the point where it comes to ...
April 20, 2010

physics
Near the surface of the Earth, a startled armadillo leaps vertically upward at time t = 0, at time t = 0.5 s, it is a height of 0.98 m above the ground. At what time does it land back on the ground?
April 20, 2010

Physics
A motorist drives along a straight road at a constant speed of 60 m/s. At time t = 0 she passes a parked motorcycle police o±cer. The o±cer takes o® after her at t = 0 and accelerates according to the formula a(t) = bt, where t is the time and b is a positive...
April 20, 2010

math
I'm completely lost withhow u solve this quadratic equation using the square root method 6x^2=1
April 18, 2010

Math
Laura invested her savings in two investment funds. The that she invested in Fund A returned a profit. The amount that she invested in Fund B returned a profit. How much did she invest in Fund B, if both funds together returned a profit?
April 18, 2010

chemistry
how do you convert the moles of nh3 co2 ang h2o? is it just 2 mol nh3 1 mol co2 and 1 mol h20?
April 16, 2010

chemistry
Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.
April 16, 2010

Chemistry
If you add 2.50 mL of .150 M HCl to 100 mL of a buffer consisting of .100 M CH_3COOH and .200 M CH_3COONa, what will be the change in pH? (Ka of CH_3COOH is 1.7 x 10^-5).
April 11, 2010

physics
Got it, thanks!
March 29, 2010

physics
Two flat slides of glass are seperated at one edge by a thin wire, as shown below. The top surface of the upper slide and the bottom surface of the lower slide have special coatings on them so that they reflect no light. The system is illuminated with light of wavelength 550 ...
March 29, 2010

math
Determine the area between the z-scores in each pair for a normal distribution. Round your answers to 4 decimal places. (a) 1.12 and 1.98 (b) –2.12 and –1.0
March 28, 2010

Business Law Exam 210 True Or False questions. 1. Both "commom law: contracts and UCC contracts are subject to the plain menaing rule only if they are simple and plain contracts. 2.when a term in a contract is ambiguos, it is generally interpreted in favor of the party ...
March 27, 2010

physics
Two parallel wires which carry currents I1 = 69 A and I2. The top wire is held in position, the bottom wire is prevented from moving sideways but can slide up and down without friction. If the wires have a mass of 5.3 g per metre of length calculate current I2 such that the ...
March 22, 2010

Chemistry
How much energy will be released when 11.11g of calcium chloride dissolves in 100 mL of water. deltaHf of Ca 2+ (aq)=-543Kj/mol, deltaHf of Cl 1-(aq) = -167Kj/mol CaCl2(s) ==> Ca 2+(aq) + 2Cl 1-(aq)
March 4, 2010

statistics
An experiment consists of rolling a die and selecting a marble from a bag. the bag has 7 orange, 3 pink, and 6 grey marbles. What is the probability of rolling a multiple of 3 and selecting a pink marble? Anwer: The two events are independent of each other, therefore we ...
March 2, 2010

Physics
Assuming I did it correctly: F=ma mass = the mass of the electron = 9.11 * 10^-31 kg a= 115 m/s plug in your known variables F will equal 1.05 * 10^-28 Newtons (N) Next, F=qE q equals the charge of the electron, or "point charge". q=1.6 * 10^-19 C Solve for E, so E=F...
March 1, 2010

Math
A coin bank contains only nickels,dimes, and quarters. the value of the 19 coins in the bank is \$2.00. There are twice as many nickels as dimes. Find the number of each type of coin in the bank. How do I solve this?
February 24, 2010

Mathematics
is it 4 liter???
February 24, 2010

Math
A coin bank contains only nickels,dimes, and quarters. the value of the 19 coins in the bank is \$2.00. There are twice as many nickels as dimes. Find the number of each type of coin in the bank. How do you solve this?
February 24, 2010

psych
At the end of the article they did do an experiment?
February 14, 2010

psych
Does the study in the article below use the experimental method or the correlation method and why? I'm stuck and keep going back and fourth on it Soccer Referees Hate the Tall Guys Many of soccer's greatest players have been small fries. Diego Maradona is only 5'5&...
February 14, 2010

chemistry
How many atomic orbitals are formed duing a pi bond between p two orbitals? Does the pi bond count as another orbital? Im confused if the answer is 3 or 2? can someone help me :(
February 7, 2010

Algebra
C=z+zse
February 5, 2010

math
A pencil, eraser, and notebook cost \$1 in total. A notebook costs more than 2 pencils, 3 pencils cost more than 4 erasers, and 3 erasers cost more than a notebook. How much does each item cost?
February 4, 2010

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