Tuesday
July 22, 2014

Posts by jason


Total # Posts: 1,084

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.

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?

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?

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)?

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?

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

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....

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 stat...

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.

1st grade
fine the rule

math
find the decimal notation for 63/3/8

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 th...

math
nvm you dont have to answer this. i was told the wrong problem.

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?

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?

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?

Chemistry. can jus anyone giv me ther opinion.
k thank u

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.

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? ---------------------------------------------------------------------------...

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.

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

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

Economics
Why has China begun an economic shift towards a free enterprise system?

High school economics
thanks!

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?

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

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

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

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

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

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?

chemistry
how to balance ZnO+2HCl yields ZnCl2+H2O

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

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 ...

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 ...

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

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 ...

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

Math
Please excuse my dear aunt sally

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.

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.

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

British Literature
what is number 4?

British Literature
what is number 4?

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

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?

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-pe...

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-pe...

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-pe...

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

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?

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

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.

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

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?

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...

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

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...

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

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

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

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) compressi...

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) compressi...

Physics
this isn't the right answer either

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) compressi...

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 run...

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 frequ...

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 res...

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?

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...

maths
360

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

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?

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?

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.

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).

physics
Got it, thanks!

physics
Got it, thanks!

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 n...

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

Business Law
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 wh...

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 l...

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)

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 multip...

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...

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?

Mathematics
is it 4 liter???

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?

Chemistry
false

psych
At the end of the article they did do an experiment?

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&...

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 :(

Algebra
C=z+zse

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?

Math
How many milliliters of a 75% acid solution must be added to 90 ml of a 10% acid solution to make a 25% acid solution?

math
How many milliliters of a 75% acid solution must be added to 90 ml of a 10% acid solution to make a 25% acid solution?

PUBLIC POLICY DEVELOPMENT IN HEALTH & HUMAN SERVIC
THIS IS THE ANSWER THAT i HAVE COME UP WITH PLZ TELL ME WHAT YOU THINK....I feel that we can use the same problem analysis for both historical and modern problems because although we have come a long way we can still learn from history and the problems in today's society a...

PUBLIC POLICY DEVELOPMENT IN HEALTH & HUMAN SERVIC
Why are we able to use the same problem analysis categories mentioned in Ch. 1 of Social Policy and Social Programs to analyze historical problems as well as problems facing modern society? I have read the whole chapter and I still can not find the answer to this question can ...

science
air pressure changes whats the effect of that

Physics
Thank you!!! :)

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