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August 20, 2014

Posts by J


Total # Posts: 714

Physics
A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless pulley to a 2.5 kg mass (m2) that hangs over the side of the shelf 1.2 m above the ground. The system is released from rest at t = 0 and the 2.5 kg mass strikes the ground at t = 0.82 ...
February 26, 2012

chemistry
12.2
February 22, 2012

Physics
(b) What is the acceleration of the ball if an upward force of 64 N is applied?
February 20, 2012

math
a shot is released at a height of 1.89m, with a speed of 13m/s and at an angle of 34 degrees. Calculate the maximum height reached and the time at which this occurs, the range and the time of flight, and the optimum projection angle.
February 16, 2012

biomechanics
a shot is released at a height of 1.89m, with a speed of 13m/s and at an angle of 34 degrees. Calculate the maximum height reached and the time at which this occurs, the range and the time of flight, and the optimum projection angle.
February 16, 2012

physics
A tiger leaps horizontally from a 15.0 m high rock with a speed of 7.10 m/s. How far (in meters) from the base of the rock will it land? so using the equation h=1/2 gt^2 and i put in 15 for h and g is 9.8 so i solve for t. is this right and when do i use the 7.10 m/s
February 14, 2012

physics
so does that mean vf is zero, vi is 29.69848481, and g is 9.8
February 14, 2012

physics
A golfer drives a ball with a velocity of 42 m/s at an angle of 45 degrees above the horizontal. What is the maximum height (in meters) of the ball above the level fairway?
February 14, 2012

physics
so h is 15, g is 9.8 15= 4.9t^2 then take the square root of 3.061. then do i multiply by 15?
February 14, 2012

physics
is g negative or positive, because that is what i did and the answer is still wrong!
February 14, 2012

goverment
Federal regulatory agencies have responsibility primarily in the area of
February 13, 2012

Physics
A circular automobile racetrack is banked at an angle theta such that no friction between road and tires is required when a car travels at 28.0 m/s. If the radius of the track is 390 m, determine theta .
February 11, 2012

calculus
Parametrize the curve of intersection of x = -y^2 - z^2 and z = y.
February 8, 2012

Chemistry
What is the empirical formula if given c-.1929 h-.01079 o-.08566 cl-.1898
January 30, 2012

chemistry
The electrochemical cell described by the balanced chemical equation has a standard emf (electromotive force) of -4.05 V. Calculate the maximum electrical work (kJ) the cell has done if 6.8500 mol of F2(g) (Molar Mass - 38.00 g/mol) forms. Round your answer to 3 significant ...
December 4, 2011

Chemistry
Thank you so much :)
December 3, 2011

Chemistry
If the initial concentration of NH3(g) is 4.643 mol/L, calculate the % of NH3(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kc at 773.0 K is 16.70. The initial concentration of the reaction products is 0 mol/L. 2NH3(g) = ...
December 3, 2011

physics
2.7
November 20, 2011

Physics 1
12000j
October 20, 2011

math
112-49=63 63/(7+7) = 63/14 =4.5 4.5+ (8-2)^2 4.5+ 6^2 40.5 jeeze this was easy,how old are you, 3??
October 19, 2011

physics
you can use the max height for parabloic path equation.look it up on google you lazy bum!
October 19, 2011

physics
the answer is dragonballs....simple as that.
October 19, 2011

Science
When plants die, what happen to carbon dioxide? They would be more co2 or less?
October 18, 2011

Math
Round 50.4 square miles to the nearest Square mile
October 13, 2011

Science (Chemistry
ad
October 11, 2011

Math
Construct a grouped frequency distribution for the following 28 scores using a class width of 4: 64 63 58 46 52 62 47 49 56 47 43 41 45 51 60 62 51 61 50 55 56 53 54 58 48 48 58 46
October 10, 2011

physicsssss
1- d= 270 2- speed= 73
October 9, 2011

physics
-2.7 cm/s
October 9, 2011

Physics 1
A mass of 5.2 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 29 Newtons. If the length of the incline is 78 meters and the mass is originally at rest at the top of the incline and then released, how long does ...
October 4, 2011

Physics 1
A mass of 5 kg lies on a frictionless, horizontal floor. A force of 135 Newtons is applied to the mass at an angle above the positive x axis and a force of 14 Newtons is applied to the mass at an angle of 22.8 degrees below the negative x direction (see sketch). If the angle ...
October 4, 2011

chemistry
What is the specific heat capacity of a metal if it requires 176.1 J to change the temperature of 15.0 g of the metal from 25.00°C to 30.00°C?
October 4, 2011

math
three men and their wives were given $5400. the wives together received $2400. sue had $200 more than jan, and ellen had 200 more then sue. who was married to whom?
September 28, 2011

math
a box of munchkins contains chocolate and glazed donut holes. if Gloria ate 2 chocolate , then 1/11 of the remianing munchkins would be chocolate. if she added 4 glazed to the box, 1/7 of the box would chocolate. how many munchkins are in the original box?
September 28, 2011

math
peg spends $7.50 a week for grapefruit. When grapefruit are out of season, she gets 1 fewer grapefruit than when they are in season. If the price decreases by $3 per dozen in season, how many dollars will it cost her to buy a dozen grapefruit out of season?
September 28, 2011

Physics help!
F= ma= Tension-Weight ma+Weight=Tension (4125kg)(0.0300 * 9.8)+ (4125kg)(9.81)=Tension Calculate and this will give you the answer for maximum force. For part (2) You have to subtract them (ma-weight)
September 26, 2011

geometry
This circle has a circumference of 56. What is the radius of the circle?
September 21, 2011

math
describe all the numbers when rounded to 312,000
September 8, 2011

MATH
USING AM IMAGINARY FIGURE OF $19,250.00 AS AN ANNUAL INCOME FIGURE, HOW MUCH MONEY COULD YOU SAVE A YEAR IF YOU BUDGETED HALF OF 2.4%?
September 7, 2011

math
You have 2 floors, and there are 14 steps inbetween the two floors. you have a cat that can get to the top by either taking one step at a time or two steps. ( at one time going up the cat can take both one or two steps). How many possible combinations are there for the cat to ...
September 2, 2011

geometry
Given ABCD, solve for x.
August 30, 2011

geometry
Line e bisects line xy at m and divides line xy into two equal parts. name a pair of congruent segments.
August 24, 2011

chemistry
sorry. The reaction is: 2 NO(g) + Cl2 ---><--- 2NOCl deltaH is the heat of reaction deltaS is the change in entropy T is temperature in kelvin deltaG is a direct measure of spontaneity DeltaH (kJ/mol) 2NO= 90.29/mol DeltaH (kJ/mol) Cl2= 0 DeltaH (kJ/mol) 2NOCl= 51.71/mol...
August 1, 2011

chemistry
Gibbs free energy What is the equilibrium constant at 25 C? deltaG= deltaH - (T(K)+deltaS) deltaS= -121.1 deltaH= -77.36 so at 25 C deltaG = -77.36 - (298*(-121.1)) deltaG ~ 3.6*(10^4) so my question is: what *is* the equilibrium constant, or perhaps more accurately, how does ...
August 1, 2011

rate of reaction (formatted repost)
I can't get my table to line up so I've surrounded the values in curly brackets. Experiment [SO2]i [O2]i IRD O2 {1} {0.05} {0.05} {7.3*[10^(-2)]} {2} {0.10} {0.05} {2.9*[10^(-2)]} {3} {0.10} {0.15} {2.6*[10^(-1)]} {4} {0.12} {0.12} {?????????????} so overall oreder is ...
July 20, 2011

rate of reaction
What is the initial rate of *appearance* of SO3(g)? a reaction and table are given: reaction: 2S02(g)+O2 -------> 2 SO3(g) Table note: i= initial, IRD= initial rate of disappearance; concentrations given in molarity (M) IRD given in M/s. Experiment [SO2]i [O2]i IRD O2 1 0....
July 20, 2011

math
Express the volume of a rectangular solid (box) whose height, width and length are x,2x and 3x, respectively, as a function of its width.
July 1, 2011

Psychology
While all four are definitions of a mental disorder, the correct answer is D.
June 28, 2011

physics
a driver releases an air bubble of volume 2.0 cm^3 from a depth of 15 m below the surface of a lake where the temperature is 70C.
June 21, 2011

chemistry
13.88 mol oxygen
June 3, 2011

Education
So are the answers B, and D
May 9, 2011

chemistry
Is there a relationship between HOMO & LUMO and bonding & antibonding? Explain.
April 18, 2011

PHYSICS
Its actually FFTF, thanks for the help
April 15, 2011

PHYSICS
A) As a wind instrument warms up, the resonant frequencies of the instrument tend to slightly decrease. B) If the air in a concert hall warms up, the resonant frequencies of the string instruments will change precisely the same as the resonant frequencies of the wind ...
April 15, 2011

Chemistry
30g
April 13, 2011

calculus
A rectangular box is to be constructed from two different materials. The box will have a square base and open top. The material for the bottom costs $4.25/m2. The material for the sides costs $2.50/m2. Find the dimensions of the box with the largest volume if the budget is $...
April 9, 2011

math
A circular pie with a diameter of 9.8 inches is cut into 7 equal slices. What is the approximate area of one slice?
March 31, 2011

math
Denisha used 9 balls of clay and 16 straws to make a solid pyramid.how many faces does the solid have?
March 29, 2011

physics
An object traveling 200 feet per second slows to 50 feet per second in 5 seconds. Calculate the acceleration of the object.
March 28, 2011

math
What is the degree of the 3rd angle if the other two are 68 degrees?
March 28, 2011

Math
20(1/5n - 3/4) + 9n
March 22, 2011

physics
0.35
March 20, 2011

coordinate geometry
all i gotta do is find slope & y intercept this is 6th math
March 3, 2011

coordinate geometry
some smart person solve thiss ;] y-18x+18=4 or help me im confused
March 3, 2011

chemistry
The simple rule “Like dissolves like” is often used to describe the solubility of a substance in different solvents. Write a short paragraph discussing your evidence for this rule. Include in your discussion where you think this rule works best and where it seems to ...
February 27, 2011

Physics
A 55.0 kg girl is roping through the top of a tiny tree. She quickly swings down from her 12.0 m high perch and grabs a 21.0 kg dog as she swings. They barely swing back up to a tree limb. How high is this tree limb?
February 15, 2011

physics-mechanics
A high-speed test track for cars has a curved section — an arc of a circle of radius R = 1440 m. The curved section is banked at angle a = 19.1 degrees from the horizontal to help the cars to stay in the road while moving at high speeds. The acceleration of gravity is 9.8...
February 12, 2011

Math
Need help solving this problem. If there's an equation at the end, need help in how to solve that also. Compounded interest problem. Principal $825. Rate 4%. Compounded Annually. Time 10 years.
February 9, 2011

j
What were the factors that played a significant role in the collapse of Russian control over Eastern Europe?
February 7, 2011

arithmetic
How do I solve these questions? 3 1/3 - 2 2/5= 2.75 + .003 + .158 = 7/20 is equal to ? What is the value of the expression 2x2+ 3xy – 4y2 when x = 2 and y = - 4? 16x - 8 = If 2x – 3(x + 4) = - 5, then x = – 3(5 – 6) – 4(2 – 3) =
February 3, 2011

Calculus
find lim f(x) - lim f(x) x->infinity x->-infinity if f(x)=ln (x+sqrt[x^2+a^2])/(x+sqrt[x^2+b^2]) a and b are real numbers
February 2, 2011

Calculus
find lim f(x) - lim f(x)
February 2, 2011

Physical Science
If a person is traveling at a rate of seventy five miles per hour in a straight line, how far would they travel in three seconds?
February 1, 2011

comm
extra is a adjective right???
January 18, 2011

comm
envelope-adverb credit-adjective spent-adverb
January 18, 2011

comm
came over- adjective frowning- adverb
January 18, 2011

comm
this is the reason why getting a credit card at a young age is not a great idea because you get anxious and want to buy a lot of things when you know you don't have the money.
January 18, 2011

comm
yes i do need help
January 18, 2011

comm
i need help identify adjectives and adverbs:My dad added me as an extra card holder on his credit cards. I was very excited that I could purchase products now and pay for them later. I didn’t realize how much money I was spending. He came over to my house recently, ...
January 18, 2011

physics
Okay, I have an example problem that I'm trying to solve that comes with the answer; I'm just trying to figure out what to do. A man jogs at a speed of 1.8 m/s. His dog waits 2 s and then takes off running at a speed of 4 m/s to catch the man. How far will they have ...
January 15, 2011

Conductivity
you are amazing!
January 12, 2011

history
Who were some of the original Texas Wildcatters?
January 6, 2011

physics pleaaaaaaaaaaaaaaaaaaaaaaaaaaaaaase I need
Consider a square ABCD of side 10cm and total mass 10kg. Let O be the center of the sqaure. We cut a square of corners O and C. Find the central mass of the obtained shape after removing the small cutten sqaure. I appreciate your help. thank you
January 6, 2011

math/ physics
Consider a square ABCD of side 10cm and total mass 10kg. Let O be the center of the sqaure. We cut a square of corners O and C. Find the central mass of the obtained shape after removing the small cutten sqaure. I would appreciate your help. thank you
January 6, 2011

algebra
2y-6x=8 2y=6x+8 y=3x+4 please explain this to me
January 5, 2011

math
i was shown example: x+6=-5 6=-5 6--5=x x=-11 please explain to me how they got this
January 5, 2011

world history
What are some characteristics of Greek civilizations?
December 14, 2010

Physics
TH/TC=(1)/(1-0.308)
December 10, 2010

physics
your so stupider than me if you donts know hows to do this problam!
December 6, 2010

Europe
what is the most important advantage og having germany in the European Union?
December 2, 2010

math
Hmm 12 is already an even number! Hence you should not count 12 twice, therefore answer should be 7/15. :)
November 27, 2010

social studies
Hi majenta, In my view a thesis statement is only good if it is properly justified. In this case, you have to clarify what you mean by "important" - which may be subjective (different people may interpret it differently) as well as rather broad. So like what I think ...
November 27, 2010

holy name university
Hi january, Dalton's Law of partial pressures states that P(total) = P(1) + P(2) + P(3) +....+ P(n) where 1, 2 and 3 are gases in the mixture. So applying the law 150kPa = 100kPa + 24kPa + P(oxygen) Hope I helped! (: -J
November 27, 2010

chemistry
Oops, sorry, my apologies for typing in caps. Was just trying to point that out. :)
November 26, 2010

chemistry
Hi faye, Alright so we want to prepare a 800ml solution of 0.15M concentration. So first we calculate the amount of Ca(OH)2 **NOTE: SHOULD NOT BE CA(OH) COS +2 CHARGE OF CA2+ IS NOT BALANCED! CA(OH)2 IS A SOLID AND NOT AN ION, HENCE THE COMPOUND CANNOT HAVE AN OVERALL CHARGE...
November 26, 2010

Chemistry
Hi Lindsay, Alright, to begin with, since this is an organic compound, we identify the functional group. [-C(=O)-NH- means its an amide] So when you hydrolyse an amide, you are breaking the (amide) bond between C=O and N-H, and you add water because its a hydrolysis (OH- goes ...
November 24, 2010

chem class
Hi laney, For this question, it would be appropriate for you to ask yourself.. what is present in the solution after mixing? KOH is a strong basic salt while HCL is a strong acidic salt. KOH + HCL --> KCL + H2O Note that amount of KOH = HCL = 0.125 X (50/1000), so there is ...
November 24, 2010

chemistry
Hi roseanne, First, we write out the equation when MX2 dissolves in water (or a suitable solvent): MX2 --> (reversible arrow) M2+ + 2X- So Ksp = [M2+][X-]^2 Solubility would refer to the concentration of an ion produced in 1:1 ratio with the original solid. In this case, we...
November 24, 2010

Chem, LAST ONE PLEASE HELP!
Hey Tara, Hmm, I'm not too sure about this question, but I'd guess it has something to do with the following formula: G = G(not)+ RTlnQ So basically G(not) = -67.4 kJ R= 0.008314 kJ mol^-1 K^-1.(molar gas constant)(Note that units must be kJ to match up with the G(not...
November 24, 2010

physics
Hi sweetie, As a coconut is falling down, the only force acting on it is the gravitational force (its weight) if you neglect air resistance. So as it is accelerating as it falls, velocity ______. P.E. of coconut = mgh, where m = mass of coconut, and h = height of coconut above...
November 24, 2010

physics
Hi sweetie, momentum = mass (kg) X velocity (m/sec). So for 1) At rest, velocity = 0m/sec. So momentum should be.... (Apply formula above) [Ans:0 kgm/sec] for 2) At that final state, velocity = 30m/sec. So momentum should be.... (Apply formula above) [Ans: 90,000kgm/sec] for 3...
November 24, 2010

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