Sunday
February 14, 2016

Posts by john

Total # Posts: 7,298

physics
When a 0.106 kg mass is suspended at rest from a certain spring, the spring stretches 3.50 cm. Find the instantaneous acceleration of the mass when it is raised 5.20 cm, compressing the spring 1.70 cm.
September 20, 2015

American History
Throughout the 17th and 18th centuries the colonists underwent a gradual transformation---they became less Anglo-American and more uniquely American. Discuss four elements responsible for this slow metamorphosis. (To merely list the elements is not enough, you must show how ...
September 20, 2015

P6 maths
At a concert, tickets were sold at $12 , $30 and $50. The sales of $12 tickets made up 25% of the total amout of money collected. The sales of $30 tickets made up of 60% of the total amount . Given that 5 more $12 tickets were sold than the $30 tickets , how many $50 tickets ...
September 20, 2015

P6 maths
Thank you!
September 19, 2015

P6 maths
Mrs Wong baked some pizzas for her students. The boy received twice as many pizzas as the girls. There were as many girls as boys in the class. Each girl ate 4/9 of a pizza and they finished all pizzas that were given to them. Each bot ate 3/4 of a pizza and they had 3 3/4 ...
September 19, 2015

Chemistry
i don't get what atmospheric is supposed to mean, i under stand at room temp, but not atmospheric. i don't know the answers.
September 18, 2015

Chemistry
what is the following's states at atmospheric temperature? 1. diamond 2. mercury 3. oxygen 4. clay 5 cooking oil 6. neon
September 18, 2015

Math
So 10.25=0.05n+0.1d+0.25q n=3d q=4*d+1 Substitute d and q to the top equation So 10.25=0.05(3d)+0.1d+0.25(4*d+1) Distribute 10.25=0.15d+0.1d+1d+0.25 Simplify 10.25=1.25d+0.25 10.25-0.25=1.25d --> 10/1.25=d--> d=8 plug 8 back into the equations 3*8=n --> n=24 4*8+1=q...
September 16, 2015

Algebra 2
Can someone help me simplify this exponential expression? (a-4)/(a^6) The answer I got was (a^5)- 4/a^6. Is this correct and if not where did I go wrong?
September 16, 2015

Chemistry
How many grams of rust are produced from the oxidation of 10.0 lb of iron?
September 15, 2015

Chemistry
would it be 10? since it takes double the amount of Fe to make rust. 5.0g of rust is .0313 moles, you would multiply it by 2?
September 15, 2015

Chemistry
How many grams of iron must be oxidized to produce 5.0g of rust? (Fe2O3) I have no idea how to solve this!
September 15, 2015

Math
Romain,fabien,lise,jen and adrien stand in a single row.romain is after lise.fabien is before romain and just after jennifer.jennifer is before lise but she is not d first.where iS adrien?
September 14, 2015

math
1.4 divided by 36.96
September 13, 2015

math/science
t = 0 in 1982 t = 8 in 1990 that is 8 years later. C = 3440 *(3/4)^0 = 3440 C = 3340 * (3/4)^8 = _____ Take the ratio of the ans for 1990 divided by the ans for 1985
September 13, 2015

Psychology
The indep. variable is the drug and it has 3 levels - placebo, 10 mg and 20 mg. the response to the drug is the dependent variable because the values are dependent on the amount of drug given.
September 13, 2015

math
x = amount at 14% y = amount at 8% x + y =60000 .14x + .08y = 6780 Most people will multiply the second equation by 100 to get rid of the decimals. x + y = 60000 14x + 8y = 67800 if you eliminate the y's you will be left with x = the value invested at 14% Multiply the top ...
September 13, 2015

math/science
divide the surface area of land by earth 5.73/1.97 10^7/10^8 2.91 x 10^-1 = .291
September 13, 2015

Math
think about 6 divided by ____ = 2 How would you solve this problem? divide 6 by 2 to get 3 It is true that 6 divided by 3 = 2 do the same thing here- -1/2 divided by -7/3 Instead of dividing fractions we multiply by the reciprocal -1/2 times -3/7 Multiply the numerators and ...
September 13, 2015

physics
Distance = rate x time 21.8 min /60 min/hour = ___ hours 13.1 min/60 Min/hr = ___ hours After converting all times to hours, multiply those times b the speed given in km/hr Of course lunch and buying gas gets multiplied by zero because you are stopped. Sum all of your other ...
September 13, 2015

Geology
formula for rate of change is like the slope formula from math. It is rise/run which is vertical distance/horizontal distance
September 13, 2015

Neuroscience
I'm struggling with the following question: The opening of chloride selective channels by a neurotransmitter X will drive membrane potential toward the chloride equilibrium potential. Assume that early during cell development, Cl is pumped into the cell for a concentration...
September 13, 2015

algebra
Lauren wants to purchase custom-made bumper stickers to advertise her business. Two websites offer different deals: Website A: Pay a fee of $80.00, plus $0.35 per bumper sticker or Website B: Pay a fee of $49.25, plus $0.50 per bumper sticker Website B is the cheaper option if...
September 11, 2015

Math
Romain,fabien,lise,jen and adrien stand in a single row.romain is after lise.fabien is before romain and just after jennifer.jennifer is before lise but she is not d first.where iS adrien?
September 11, 2015

Math
How many digits are needed to write down all from 1-100?
September 11, 2015

math
The number of digits used to write all the page in a book is 35. How many pages has the book?
September 11, 2015

Physics- Relativity
A lighthouse sweeps its beam of light around in a circle once every 7.2 s. To an observer in a spaceship moving away from Earth, the beam of light completes one full circle every 9 s. What is the speed of the spaceship relative to Earth
September 9, 2015

finite
20P0=
September 7, 2015

finite
suppose that 2 cards are randomly selected from a standard 52 card deck. A) whats the probability the first card is a club and the second is a club if the sampling is done without replacement? B) if both cards are clubs but it is done with replacement?
September 7, 2015

finite math
Among 26 to 31 year olds 35% say they have driven a car while under the influence of peer pressure. suppose 2 26 to 31 year olds are selected at random. A)the probability that at least 1 has not driven under the influence? B)the probability that at least 1 of the 2 adults has ...
September 7, 2015

problem solving
for a parallel structure of identical components, the system can succeed if at least 1 of the components succeeds. Assume that components fail independently of each other and that each component has a 0.19 probability of failure. A) unusual to see 1 component fail? B) unusual ...
September 7, 2015

finite
The probability that a randomly selected 2 year old feral cat will live to be 3 years old is 0.73877. A) what is the probability that 2 randomly selected 2 year old cats will live to be 3? B) what is the probability that 7 will live to be 3?
September 7, 2015

baseball
A baseball player hit 59 home runs in a season. Of the 59 home runs 18 went to right field, 16 went to right center, 8 went to center field, 12 went to left center field, and 5 went to left field. A) What is the probability that a randomly selected home run was hit to left ...
September 7, 2015

statistics
According to a certain country's department of education 39.6% of 3-year olds are enrolled in day care. What is the probability that a randomly selected 3-year old is enrolled in day care?
September 7, 2015

stats
Suppose you toss a coin 100 times and get 82 heads and 18 tails. Based on these results, what is the probability the next flip will be a tails?
September 7, 2015

Chemistry
For the combustion of 100. gm of methane, how much heat would be generated?
September 6, 2015

chemistry
It took 20 seconds for a certain volume of oxygen to effuse through an orifice(small opening) at 298K. How long will it take the same volume of each of the following gases to effuse through the same orifice at the same temperature?. The gases are hydrogen, helium, and chlorine...
September 6, 2015

calculus
a colony of bacteria living on a petri dish under optimal conditions doubles in size every ten minutes. At noon on a certain day, the Petri dish completely covered with bacteria. At what times (to the nearest hour, minute and second) was the percentage of the plate covered by ...
August 27, 2015

finite
the probability that a randomly selected 4 year old male feral cat will live to be 5 years old is 0.87886. (a)what is the probability that two randomly selected male 4 yr old cats will live to be 5.(b) what is the probability that six randomly selected male cats will live to ...
August 25, 2015

Science
You have 75.0 mL of a 2.50 M solution of Na2CrO4 (aq). You also have 125 mL of a 2.15 M solution of AgNO3 (aq). Calculate the concentration of NO3 when the two solutions are added together.
August 22, 2015

Geometry
how do you solve this step by step im stuck
August 22, 2015

Quadratics/ Algebra
a fraction is such that the numerator is seven less than the square of the denominator. if six is added to the numerator and on to the denominator the result is 2. Find the fraction
August 21, 2015

le
a fraction is such that the numerator is seven less than the square of the denominator. if six is added to the numerator and on to the denominator the result is 2. Find the fraction
August 21, 2015

english
idea
August 17, 2015

Algebra
Factor completely: X^3n+y^3n Do I factor it as a cube? Can't figure it out
August 15, 2015

Entrepreneurs
If switching to fast replenishment compared to holding inventory in a dc (distribution center). Is this: Operational? Tactical? or Strategic?
August 13, 2015

Chemistry
I read that site before coming here, I still didn't understand it
August 12, 2015

Chemistry
Can someone explain to me what an intermediate product is and give me and example?
August 12, 2015

algebra
Find the dimensions of the rectangle meeting the specified conditions
August 8, 2015

algebra
The perimeter is 38.8 millimeters and the length is 2.4 times the width. (Round your answers to one decimal place.
August 8, 2015

computer programming
Boardman College maintains two files—one for Sociology majors and another for Anthropology majors. Each file contains students' ID numbers, last names, first names, and grade point averages. Each file is in student ID number order. The college is merging the two ...
August 8, 2015

Physics
so i need to calculate the moment of inertia of the pulley and the angular acceleration of the pulley. mass A = 9kg Mass B = 15kg Inner pulley= Mass 3kg R= 6cm Outerpulley= mass 7kg R=12cm both are disks glued together. it is a composite pulley with two masses hanging. Mass A ...
August 8, 2015

Physic
so i need to calculate the moment of inertia of the pulley and the angular acceleration of the pulley. mass A = 9kg Mass B = 15kg Inner pulley= Mass 3kg R= 6cm Outerpulley= mass 7kg R=12cm it is a composite pulley with two masses hanging. Mass A on the outer pulley held by a ...
August 7, 2015

Statistics
Suppose a multiple-choice test has 10 questions each with 5 choices. If a student guesses randomly. What is the probability that they get an B or better. ( they get at least a 80% on the exam) make sure to declare a binomial random variable and show all work
August 5, 2015

life science
Investigation to determine whether expired air contains carbon dioxide how should state the method,step by step for the experiment
August 3, 2015

Chem
At 1 atm, how much energy is required to heat 37.0g of H2O at -24.0 C to H2O at 155.0 C?
July 24, 2015

History
27
July 23, 2015

History
How many amendments were originally proposed and submitted to Congress as the initial draft of the Bill of Rights? • A. 12 B. 8 C. 15 D. 10 what will be the answer
July 23, 2015

History
Under most domestic search warrants what legal standard must be established before a warrant will be issued? A. Reasonable suspicion B. Reasonable cause C. Certiorari D. Probable cause any one sure of the answer
July 23, 2015

Calculus
Can someone explain how cos(X)/ square root (sin (X)) is 2 square root sin(x) +c Thanks!
July 23, 2015

Geometry
Determine whether a tangent line is shown in the diagram, for AB = 7, OB = 3.75, and AO = 8. Explain your reasoning. (The figure is not drawn to scale.)
July 17, 2015

math
10 23/99 I do this by taking the 23/100 and subtracting 1 from the denominator to get 23/99. If you had 10.33333 I would put 3/10 minus 1 from denominator to get 3/9 or 1/3.
July 15, 2015

physics
A student is thrown in a lake by his teacher, the student has a mass of 70 kg and a volume of 80,000 cm^3. Would the student sink or float? What is the net force on the student? What is the density of an object that has a mass of 2000 kg and a volume of 1.5 m^3? Would it sink ...
July 14, 2015

physics
A picture hangs on the wall suspended by two strings, as shown in the figure, with θ = 65°. The tension in string 1 is 1.3 N. (a)Is the tension in string 2 greater than, less than, or equal to the tension in string 1? Explain. (b) Verify your answer to part (a) by ...
July 12, 2015

physics
A baseball player slides into third base with an initial speed of 7.75 m/s. If the coefficient of kinetic friction between the player and the ground is 0.45, how far does the player slide before coming to rest?
July 12, 2015

physics
A 320 N bench is 2.40m long. The legs are .30m from each end and weigh 15.0 N each. If 3 persons weighing in order ,500 N, 750N, and 1000N sit .40m, 1.20m, and 2m respectively from one end of the bench, what downward force must each set of legs exert on the floor?
July 12, 2015

math
distance = rate x time + rate x time 22 = 30(x) + 18 (1-x) 22 = 30x + 18 -18x x = time of car Find and multiply it by 30 to find distance traveled in the car.
July 11, 2015

vocabulary
The couple ordered four hors d'oeuvres at the wedding. Did you just want errors corrected? just caps and spelling?
July 11, 2015

math
You want to take your 3 equations in 3 variables to 2 equations with the same 2 variables. Since the first equation has x and z, lets see if we can eliminate the y by combining the 2nd and 3rd equations. To eliminate y you need the coefficients to be equal and opposite. So you...
July 10, 2015

prob & stat
3, 14 6, 10 or 6, 14 7, 10 or 7, 14 10, 14 It looks like there are 6 possibilities that meet this criteria because they all add up to at least 14 which means 14 or more years If we choose two out of 5 Use a combination of 2 chosen from 5 which is 5!/(3! 2!) = 10 choices ! ...
July 10, 2015

Probabilities
What you did seems correct to me.
July 9, 2015

math
to simplify .08c = .12d multiply both sides by 100 to get 8c = 12d Now divide both sides by 4 to get 2c = 3d c = 3/2 d c + d 3/2 d + 2/2 d = 5/2 d
July 9, 2015

english
United Nations, 310, 314, 362 charter of, 311

 Declaration of, 309

United States, 225, 238, 275, 289

 in Big Four, 322, 325-7

 in League of Nations, 299

 Lend-Lease policy of, 307

 Neutrality of, 305...
July 8, 2015

math
no it will be C
July 8, 2015

vocab
1. can be neither seen nor touched 2. has a receiver named 3. has no receiver named 4. expresses highest or lowest degree of comparison 5. add sign of possession to last name 6. indicates time 7. -ly 8. modifies a noun adjective transitive verb abstract noun superlative degree...
July 8, 2015

Math 157
C=1.75+5p
July 8, 2015

Calculus
Determine over what interval(s) is the function y=4x-6arctan(x) is concave up/concave down I took the second derivative and ended up with x=0. I do not believe I did this right. IF I happen to be right, wouldn't our answer just be undefined, rather than having intervals ...
July 7, 2015

Calculus
do you mean the other way around, when 0<y<2 it is upward, and downward at y>2 When I graph it on a number line (how I was taught) thats what I got, but of course I could be wrong.
July 5, 2015

Calculus
A particle moves on a vertical line so that its coordinate at time t is 3 y = t − 12t+ 3, t≥ 0 . When is the particle moving upward and when is it moving downward? Find the distance that the particle travels in the first 3 seconds. I got that t=2 and t=-2 and its ...
July 5, 2015

Statistics
8.15
June 30, 2015

PHYSICS
'show that a 2.5m length of wire with cross section area 0f 1.0mm and resistance of 0.75ohms has a resistivity o f 3.0 ×10-7'
June 30, 2015

Chemistry
If 100.0 mL of 0.150 M sodium nitrate is added to 50.0 mL of 0.150 M sodium carbonate, what is the resulting molar concentration of the sodium ion?
June 26, 2015

Math
My hundreds digit means nothing. Six more than my hundreds digit is my thousand’s and ones less than my thousands’ is my ten thousands. My tens digit is four more than my hundreds and my ones digit is five more than my tens digit. Question: What number am I?
June 25, 2015

Math
How do you solve the equation for finding the principal when the interest, rate, and time are given? I know the formula P=Interest over rate x time. how do you find the solution or amswer?
June 19, 2015

algebra
Since you cannot divide 4x^2 into 2x+1, the quotient would be zero with a remainder of 2x+1. Which can also be written as 0 (2x+1)/(4X^2 +8X+5)
June 16, 2015

university
A uniform electric field of magnitude 260 V/m is directed in the positive x direction. A +14.0 µC charge moves from the origin to the point (x, y) = (20.0 cm, 50.0 cm). (a) What is the change in the potential energy of the charge field system?
June 15, 2015

physic
if you have a intial object going 1m/s to the right then after 1.2seconds its going 0.5m/s to the left. whats is the constant acceleration?
June 15, 2015

Science living environment Regents
When you change the dna code to mRNA, will A become U or T?
June 13, 2015

Alg 2 HELP!
x = -b/2a which gives you a turning point which will help you come up with the max or the min. Once you fine x, then you can find y by substituting back into the original equation. Range can also be found by using this turning point.
June 12, 2015

Statistics
The total area under the control distribution curve is equal to a probability of what?
June 11, 2015

Math/Physics
No way to solve?
June 6, 2015

Math/Physics
Given the following vectors, where Vector A is 6.3 meters and Vector B is 3.5 meters, determine the magnitude of the following vector sums: A+B, A-B, B-A I tried to do magnitude such as A+B = square root (6.3)^2+(3.5)^2 = 7.2 then A-B = square root (6.3)^2-(3.5)^2 = 5.2 then ...
June 6, 2015

Chem.
Thanks
June 4, 2015

Chem.
A gas bottle contains 0.250 mol of gas at 0.973 bar pressure. If the final pressure is 1.165 bar, how many moles of gas were added to the bottle?
June 4, 2015

paramedic science
The male person on-scene is complaining of abdominal pain but refuses any treatment or transport going against your advice. He has obvious bruising to his abdomen consistent with a seatbelt injury. Using Queensland Ambulance Service protocols as a guide - discuss what steps ...
June 4, 2015

physics
A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. The door is pushed wide open (to 120 ∘ ) in 2.2s How much work was done? What was the average power delivered?
June 3, 2015

physics
What is the acceleration (in m/s^2) of a vehicle that changes its velocity from 85 km/h to a dead stop in 13 s?
June 3, 2015

physics
A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. The door is pushed wide open (to 120 ∘ ) in 2.2s How much work was done? What was the average power delivered?
June 3, 2015

statisic
I will get you started. You want see if .85 is different from .70 The numerator of your fraction will be: .85 - .70 Always subtract the population proportion from the sample proportion. The .15 has to be divided by the standard deviation. Do you have that formula? The value ...
June 2, 2015

Math
Christine's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Christine $5.85 per pound, and type B coffee costs $4.40 per pound. This month, Christine made 174 pounds of the blend, for a total cost of $906.25. How many pounds of type ...
May 31, 2015

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