Monday
November 24, 2014

Posts by Mathew


Total # Posts: 137

PROBATION AND PAROLE
According to psychoanalytic theory, the unconscious: A. consists of thoughts and feelings that can easily be called into consciousness. B. is capable of strongly influencing conscious behavior. C. is considered by Freudian thought to develop during adolescence. D. does not ...
November 20, 2014

chemistry
A 18.3 g piece of aluminum (which has a molar heat capacity of 24.03 J/oC mol) is heated to 82.4oC and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/goC) initially at 22.3oC. The final temperature of the water is 24.9oC. Calculate the ...
November 18, 2014

physics
An express subway train passes through an underground station. It enters at t = 0 with an initial velocity of 23.5 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. The station in 215 m long. (a) How long is the nose of the train in the station? (b) How fast is ...
November 17, 2014

physics
On the moon, the acceleration due to gravity is only 1.6 m/s/s. If someone on earth can throw a baseball 24.2 m high, how high could he throw it on the moon?
November 15, 2014

chemistry
The reaction SO2 + H2O =H2SO4 Is the last step in the commercial production of sulfuric acid . the enthalpy change for this reaction is -227 KJ . In designing a sulfuric acid plant is it necessary to provide for heating or cooling of the reaction mixture ? explain
November 12, 2014

physics
A jet needs to reach a takeoff speed of 75.0 m/s. If the runway is 1625 meters long, what minimum acceleration is needed? How much time will it take to reach the takeoff speed
November 6, 2014

physics
while cruising along dark stretch of highway at a speed of 25 m/s you see that bridge ahead has been washed out. you apply the breaks to and come to a stop in 4.0 sec construct the position vs time graph and acceleration vs time graph and motion graph for 4 sec interval
November 5, 2014

physics
Displacement vectors A, B, and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 22.9° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 35.2° north of west. Find the magnitudes of ...
October 30, 2014

physics
Displacement vectors A, B, and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 22.9° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 35.2° north of west. Find the magnitudes of ...
October 30, 2014

chemistry
A 100 L flask contains a mixture of methane and argon gasses at 25 degree C . The mass of argon present is 228 g and the mole fraction of methane in the mixture is 0.650 . calculate the total kinetic energy of gaseous mixture
October 26, 2014

chemistry
A compressed gas cylinder contains 1.00 into 1000 g argon gas . the pressure inside the cylinder is 2050 psi at a temp of 18 degree . how much gas remains in the cylinder if the pressure is decreased to 650 psi at a temperature of 26 degree of 26 degree c
October 26, 2014

chemistry
A bicycle tire fitted was fitted with the air pressure of 75 psi at temperature 19 degree C riding the bike on a asphalt on a hot day increases temperature of the tire to 58 degree C. The volume increase by 4% . What is the new pressure
October 26, 2014

Math
45.43
October 21, 2014

College Algebra (Word Problem)
A rectangular eld is to be fenced o along the bank of a river; no fence is required along the bank of the river. The material for the fence costs 8 dollars per running foot for the two ends and 16 dollars per running foot for the side parallel to the river. If the area of...
October 19, 2014

chemistry
1) Aqueous solutions of potassium sulfate and ammonium nitrate are mixed together. Which statement is correct? A) Both KNO3 and NH4SO4 precipitate from solution B) A gas is released C) NH4SO4 will precipitate from solution D) KNO3 will precipitate from solution E) No reaction ...
October 15, 2014

chemistry
A beaker contain 300.ml of a 0,20 M Pb(NO3) solution. If 200 ml of 0,20M solution og MgCl2 is added to the beaker, What will be the concentration of Pb2+ ions in the resulting solution
October 12, 2014

chemistry
An unknown diprotic acid requires 26.66 mL of 0.117 M NaOH to completely neutralize a 0.845 g sample. what is the molar mass of the acid?
October 12, 2014

chemistry
A student weighs out 0.568 g of KHP (molar mass = 204 g/mol) and titrates to the equivalence point with 36.78 mL of a stock NaOH solution. What is the concentration of the stock NaOH solution? KHP is an acid with one acidic proton. a. 3.15 M b. 0.0757 M c. 0.943 M d. 0.100 M ...
October 12, 2014

chemistry
Thank you very much
October 12, 2014

chemistry
you have exposed electrodes of light bulb in a solution of H2SO4 such that the light bulb is on you add dilute solution and bulb goes dim which of the following could be the solution Ba(OH)2 NaNO3 K2SO4 Cu(NO3)2 none of the above
October 12, 2014

chemistry
An analytical procedure requires a solution of chloride ions ,How many grams of CaCl2 must be disolved to make2.15L of 0.0520 M C
October 12, 2014

physics
22) A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of A) less than 1 unit. B) more than 1 unit. C) 1 unit. D) not enough ...
October 9, 2014

physics
The x component of a displacement vector r is −149 m, while its y component is −174 m. (a) Find the magnitude of r. (b) Find the direction of r.
October 7, 2014

chemistry
n the spectroscopic analysis of many substances, a series of standard solutions of known concentration are measured to generate a calibration curve. How would you prepare standard solutions containing 10.0, 25.0, 50.0, 75.0, and 100. ppm of copper from a commercially produced ...
October 6, 2014

chemistry
Following oxidation-reduction reaction by using the oxidation state method a) O2+H2O+Pb=Pb(OH)2
October 5, 2014

physics
Thank you
October 2, 2014

physics
Drow a velocity time graph graph for the ball starting 1.0 s before the collision to wall and 1.0s after the collision
October 2, 2014

physics
Drow a velocity time graph graph for the ball starting 1.0 s before the collision to 1.0s after the collision
October 2, 2014

chemistry
A student mixes 4 reagents together thinking that the solution will neutralize each other . The solutions are mixed together are 50 ml of 0.100 M .hydrochloric acid 100 ml of 0.200 M of nitric acid 500 ml of 0.0100 M calcium hydroxide and 200 ml of 0.100 M of rubidium ...
October 2, 2014

physics
When a hammer strikes a nail, it is compressed along its length. Suppose that a steel nail 10.00 cm long and 3.00 mm in diameter is compressed an average of 65.0 µm by a 0.460 kg hammer during a 1.20 ms collision. (a) What average force was exerted on the nail by the ...
October 1, 2014

physics
A 0.450 kg hammer is moving horizontally at 6.00 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. (a) Calculate the duration of the impact. (b) What was the average force exerted on the nail?
October 1, 2014

physics
One hazard of space travel is debris left by previous missions. There are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. Calculate the force exerted by a 0.150 mg chip ...
October 1, 2014

chemistry
A 30 ml sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration is 0.0300 M give some possible identities for the unknown base
October 1, 2014

chemistry
10 ml sample of vinegar an aqueous solution 0f acetic acid( HC2H3O2) is titrated with 0.5062 M and 16.58 ml is required to reach equivalence point what is the molarity of the acetic acid b. if the density of vinegar is 1.006 g/cm3 what is the mass percent of acetic acid of ...
September 30, 2014

physics
A 96.5 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 45.5 m/s. If both are initially at rest and if the ice is friction less, how far does the player recoil in the time it takes the puck to reach the goal 18.0 m away?
September 29, 2014

physics
A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a speed of 0.540 m/s. The total mass of the sled, man, and rock is 93.5 kg. The mass of the rock is 0.300 kg and the man can throw it with a speed of 15.0 m/s. Both speeds are ...
September 29, 2014

physics
Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48-kg skater acquires a speed of 0.65 m/s. If the other skater acquires a speed of 0.84 m/s, what is her mass?
September 29, 2014

chemistry
Balance following oxidation reduction reactions using oxidation states method? a) Cl2(g) + Al(s) --> Al3+(aq) + Cl- b.) O2(g) + H2O(l) + Pb(s) --> Pb(OH)2(s) c) H+(aq) + MnO4-(aq) + Fe2+(aq) --> Mn2+(aq) + Fe3+(aq) + H2O(l)
September 28, 2014

chemistry
Thank you I appreciate it
September 27, 2014

chemistry
the concentration of a certain sodium hydroxide solution was determined by using using the solution to titrate a sample of KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. in the titration 34.67ml of the sodium hydroxide solution required to react with...
September 27, 2014

chemistry
30 ml of sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration 0.0300 M give the possible identities for the unknown base
September 27, 2014

chemistry
a student mixes 4 reagents together thinking that the solution will neutralize each other . The solution is mixed together are 50 ml of 0.100 M of HCL and 100 ml of 0,200 M of nitric acid 500 ml of 0.0100 M ca hydroxide and 200 ml of 0.100 M rubidium hydroxide . Did the acid ...
September 27, 2014

physics
Is momentum conserved when 2 carts having the same mass & the same speed collide, stick together and stop? what about the velocity
September 25, 2014

chemistry
what mass of silver chloride can be prepared by the reaction of 100 ml 0,20 M of silver nitrate with 100,0 ml of 0.15 M calcium chloride calculate the concentration of each ion reamaining in solution after the precipitation is complete
September 24, 2014

ap chemistry
what mass of barium sulfate can be produced when 100 ml 0.100 M of solution of barium chloride is mixed with 100.0 ml of a 0.100 M solution of Iron (III) sulfate
September 24, 2014

ap chemistry
what volume 0,100M of Na2PO4 is required to precipatate all the lead(II) ions from 150 ml of 0.250M Pb(NO3)2
September 24, 2014

ap chemistry
what volume of0.100 M NaPO4 is required to precipitate all the lead(II) ions from 150ml of 0.254 M Pb(NO3)2
September 24, 2014

Math
What does "Larger number exceeds three times the smaller number by four" mean?
April 21, 2014

algebra
Okay thanks, Marissa is my sister.
November 20, 2013

algebra
To the nearest tenth of an inch, find the length of a diagonal of a square whose side length is 8 inches.
November 20, 2013

Calculus
Consider the curve given by y^2 = 2+xy (a) show that dy/dx= y/(2y-x) (b) Find all points (x,y) on the curve where the line tangent to the curve has slope 1/2. (c) Show that there are now points (x,y) on the curve where the line tangent to the curve is horizontal. (d) Let x and...
October 2, 2013

calculus
Evaluate each of the following. Show all your calculations.  f" (1/3) if f(x) = −2x^5 + 2x − 6
April 17, 2013

calculus
Evaluate each of the following. Show all your calculations.  f" (1/3) if f(x) = −2x^5 + 2x − 6
April 17, 2013

calculus
Evaluate each of the following. Show all your calculations. f" (−3) if f(x)  = 4x^3 − 3x^2 + 2x − 6
April 17, 2013

calculus (gr 12)
Evaluate each of the following. Show all your calculations. f′ (3/4)if f(x) = −3x^3 − 7x^2 + 4x − 11
April 17, 2013

calculus (gr 12)
Evaluate each of the following. Show all your calculations. f" (1) if f(X)  = −3x^2 − 5x + 7
April 17, 2013

calculus (gr 12)
Evaluate each of the following. Show all your calculations. f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8
April 17, 2013

calculus (gr 12)
Evaluate each of the following. Show all your calculations. f'(3) if f(x)  = x^4 − 3x
April 17, 2013

math
thanks
February 15, 2013

math
Disks of radius 4 cm are cut from a rectangular plastic sheet of length 84 cm and width 24 cm. How many complete disks can be cut out? Find (a) the total area of the discs out (b) the area of sheet wasted I did it but the answers on the back of the book do not match heres what...
February 15, 2013

math
Julia and Bianca both leave the college at the same time, but in opposite directions. If Bianca travels 9 mph faster than Julia and after 4 hours they are 140 miles apart, how fast is each traveling?
January 14, 2013

Calculus
I have no idea what to do with this problem. Please help me found the basic formula. When Apollo 15 astronaut David Scott dropped a hammer and a feather on the moon to demonstrate that in a vacuum all bodies fall with the same constant acceleration, he dropped them from about ...
March 11, 2012

Physics
A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.77 m/s2. She decides to test the car by dragging with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 1.04 s before Kathy. If Stan moves ...
February 2, 2012

calculus
Evaluate the integral from -4 to 4 of [x^3 sin(6x)] / [sin(5x)]dx
December 10, 2011

Math
If the value of $1 is 1.082431 in one year at 8 % compounded quarterly, what is the effective interest rate? (a)82.4% (b)8% (c)0.824% (d)8.24% (e)824.31%
November 3, 2011

Physics
Does the KE of a car change more when it accelerates from 27 km/h to 37 km/h or when it accelerates from 37 km/h to 47 km/h? 1. More information is needed. 2. No difference 3. From 37 km/h to 47 km/h 4. From 27 km/h to 37 km/h
October 31, 2011

English
Can someone edit this essay? Topic is "if given funding for a small engineering project, what would you do?" 250 word limit Millions of Americans purchase bottled water everyday simply because they don't like the taste of their own tap water. While most Americans...
October 26, 2011

English
its a college essay, the topic is "discuss your favorite place to get lost." 250 word limit
October 26, 2011

English
Can someone edit this essay? High school is a menacing, over-bearing world that hardly gives the average student to even stop and think. With the threat of a possible test or project coming up, combined with constant homework, it's easy to forget you're even still a ...
October 26, 2011

Physics
It's absolutely not answer 1. could it be 3.??
October 13, 2011

Physics
A car drives up a straight hill at a constant speed of 60 kilometers per hour. A truck drives over the crest of the hill at a constant speed of 60 miles per hour. What is the net force on the car and on the truck? 1. both not zero 2. not zero; zero 3. both zero 4. zero; not zero
October 13, 2011

Physics
It would either be velocity or speed right? I would assume the weight nor the mass change.
October 12, 2011

Physics
An object traveling at a constant 20 m/sec in a circular path is changing its 1. velocity. 2. speed. 3. weight. 4. mass.
October 12, 2011

Math
A turtle crawls up a 12 foot hill after a heavy rainstorm. The turtle crawls 4 feet, but when it stops to rest, it slides back 1 1/2 feet. How many tries does the turtle make before it makes it up the hill?
October 10, 2011

Mathematics
If a brick weighs exactly as much as a 9-pound rock plus falf of another brick, what does a brick and a half weigh?
October 9, 2011

statistics
Using the Hypergeometric Rule C_3^10*C_3^(7 )= 10!/3!(10-3)! * 7!/3!(7-3)! = 120(35) = 4200
October 6, 2011

statistics
6. A geography student needs to take three 300- level and three 400- level geography classes next semester in order to graduate. If there are 10 300- level courses being offered and 7 400- level courses being offered, how many different schedules could the student have?
October 6, 2011

Honors Physics
I am still confused. For finalvelocity, where did you get 18?
September 27, 2011

Honors Physics
An automobile accelerates from rest at 1.3 m/s 2 for 19 s. The speed is then held constant for 23 s, after which there is an acceleration of −0.9 m/s 2 until the automobile stops. What total distance was traveled? Answer in units of km
September 27, 2011

Physics
I need help finding Vfinal. I have Vinitial, acceleration, and distance.
September 27, 2011

Physics
An automobile accelerates from rest at 1.3 m/s 2 for 19 s. The speed is then held constant for 23 s, after which there is an acceleration of −0.9 m/s 2 until the automobile stops. What total distance was traveled? Answer in units of km
September 27, 2011

Math
The price of a video system increased by 15% to $1,127.00. What was the price of the system before the increase? (a)$900.80 (b)$908.00 (c)$809.00 (d)$890.00 (e)$980.00 I need help with this problem and to be leaded towards the direction to find the right answer
September 18, 2011

algebra
can you write an equation for the line with slope 2/3 and y-intercept 5?
June 10, 2011

essay
So basically what you're saying is if a war breaks out in the country Canada is peacekeeping in, they'll feel obliged to participate?
May 29, 2011

essay
If anything, I feel that peacekeeping would only agitate other countries of Canada's presence, no?
May 29, 2011

essay
Thanks for the answer, but a few questions. Why exactly do developed democracies have said responsibility, and how does preventing wars protect Canada?
May 29, 2011

essay
So I have to write an argumentative essay on Canadians peacekeeping in foreign countries (Cyprus, Rwanda, Somalia, Bosnia, Croatia) and I have to argue whether Canadians should or shouldn't be peacekeeping in foreign countries. I have to have 3 main arguments, but I can&#...
May 29, 2011

algebra2/trignometry
in right triangle PQR,Q=90DEGREE,PQ=4 AND PR=7 WHAT IS ANGLE R TO THE NEARST TENTH OF A DEGREE
April 27, 2011

To Helper
Thanks a lot :)
January 13, 2011

To Helper
I had a problem to solve, and I dont get how to make equations from this problem. Mrs. Chans math class contributed 2 dollars and $1 coins to an earthquake relief fund. the number of $1 coins contributed was 8 less than 5 times the number of $2 coins contributed. if class ...
January 13, 2011

Math ---Helper
Alright thanks, if you cant find them, just search my name in the searchbox and itll come up, thanks helper:D
January 13, 2011

Math ---Helper
Helper I really need ur help with some of my math questions down below, ur the best math tutor on here, need ur help please.
January 13, 2011

Necessary Math HELp
Wow helper:D Thanks a lot buddy, I really appreciate all the time you put to help me with my question. Yeah thanks to your explanation I get it, thanks a lot:) So here's how I substitute right? 2x+y = -5 2(-4)+y = -5 -8 +y = -5 Then I add 8 to both sides and get: y = -3 ...
January 13, 2011

Necessary Math HELp
2x + y = -5 3x +5y = 3 How come I have to multiply by 5 to make the y variables cancel, like what does that mean? I dont get how ur supposed to multiply like where and how? Im really stuck right now, please help:(
January 13, 2011

Math
Mrs. Chans math class contributed 2 dollars and $1 coins to an earthquake relief fund. the number of $1 coins contributed was 8 less than 5 times the number of $2 coins contributed. if class raised total of 160 bucks, how many coins of each type was collected? it says i have ...
January 13, 2011

MATHH
Thanks a lot:D
January 13, 2011

MATHH
Solve by using elimination: 7x - 2y =3 2x +y = 4 ?????????????????
January 13, 2011

Lines and Slopes Math
A line is perpendicular to x+3y-4=0 and has the same y-intercept as 2x+5y-20=0. Find an equation for the line
January 6, 2011

Math
A line is parallel to 5x+2y-8=0 and has the same y-intercept as x+4y-12=0 Find an equation for the line.
January 6, 2011

:)
Which white person discussed or mentioned in Narrative Life is most important?
December 6, 2010

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