Thursday
December 18, 2014

Posts by John


Total # Posts: 6,391

Chemistry
Calculate the standard cell potential for each of the electrochemical cells? What would the answers be to something like this? If someone could work out the answer I would really appreciate it. My online hw keeps telling me its wrong. 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E&#...
April 12, 2014

Chemistry
Calculate ΔG∘rxn and E∘cell for a redox reaction with n = 1 that has an equilibrium constant of K = 28? What would the answer be to this? Could someone work this out for me please? ΔG∘rxn = ......kj E∘cell = ......V
April 12, 2014

physics
A cylindrical conductor of radius carries a uniformly distributed current I. Show that the magnetic field within the conductor measured at a distance r from the center is given by the following equation... B= (u0Ir)/2pi a^2
April 12, 2014

Chemistry
Calculate ΔG∘rxn and E∘cell for a redox reaction with n = 1 that has an equilibrium constant of K = 28? What would be the answer to this fine question. How would you do something like this? Thanks :) ΔG∘rxn = ......kj E∘cell = ......V
April 11, 2014

chemistry
Calculate the standard cell potential for each of the electrochemical cells? 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E∘cell......V? 2ClO2(g)+2I−(aq)→2ClO−2(aq)+I2(s) E∘cell......V? O2(g)+4H+(aq)+2Zn(s)→2H2O(l)+2Zn2+(aq) E∘cell......V?
April 11, 2014

trig
Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.
April 11, 2014

trig
How did you get 2x=211 ?
April 11, 2014

trig
Given angle x,where 0 <= x <= 360 (degrees) solve for to the nearest degree. a)cos(2x) = 0.6420 b)sin(x + 20) = 0.2045 c)tan(90 - 2x) = 1.6443
April 11, 2014

trig
Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.
April 11, 2014

trig
Steve - Could you elaborate on your answer please? I don't understand where you got those two numbers from
April 11, 2014

trig
Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.
April 11, 2014

math
Number of apartments rented The manager of an 80 unit apartment complex knows from experience that at a rent of £¤300 per unit, all the units will be full.On thw average, an additional unit will remain wacant for each £¤20 increase in rent over £...
April 11, 2014

domestic violence
why might it be necessary to remove a possible suspect right away from the scene and hold them involuntarily for evaluation at a mental health facility?
April 11, 2014

public speaking
when speaking about abstract concepts, make them concrete ti the audience by?
April 11, 2014

chemistry
What would be the final concentration of [K+] if we mix 0.234 L of a solution with a concentration of 1.2M K2CO3 with 312.5 mL of a solution with a concentration of 0.32 M K3PO4
April 10, 2014

chemistry
Calculate the volume of solution needed to obtain 0.320 mol of KCl from a solution with a concentration of 0.64 mol dm-3
April 10, 2014

College Algebra
In china, the number of sport utility vehicle sold in 2003 was predicted to grow by 30% annually for the next 5 years. what is the doubling time?
April 9, 2014

chemistry
If a gas contains 25 ml of oxygen at 37oC and a pressure of 700 mm Hg, what is the volume under STP.
April 8, 2014

Biology
If a gas contains 25 ml of oxygen at 37oC and a pressure of 700 mm Hg, what is the volume under STP.
April 8, 2014

math
@other John ....cuz S shows up 2 times.....
April 8, 2014

math
Marissa, how did you get 7 total letters? There are only 6 letters you idio
April 8, 2014

physics
The figure shows a nozzle on a hose carrying water. If the pressure at Point 1 is 290 x 10^3 Pa, the velocity 0.64 m/s, and the diameter 20 cm. Given that the diameter at point 2 is 1.4 cm, what is the velocity at point 2? v_2 = What is the pressure at point 2? P_2 =
April 7, 2014

Business
Bob buys a house for 150,000 with a mortgage rate of 5.8% convertible monthly. At the time of purchase he owns a 10,000 20-year zero coupon bond that earns 4.5% annually. The bond matures in 15 yeas. He would like to use the proceeds from the bond to make a payment larger than...
April 6, 2014

Math
In a survey of 280 college students, it is found that 67 like brussels sprouts, 93 like broccoli, 60 like cauliflower, 26 like both brussels sprouts and broccoli, 21 like both brussels sprouts and cauliflower, 20 like both broccoli and cauliflower, and 10 of the students like ...
March 30, 2014

chemistry
What are strongest intermolecular force in hydrogen iodide ?
March 29, 2014

Statistics
Sorry to ask another question but I keep struggling with this class. If all else remains the same, which of these will make a confidence interval for a proportion narrower? I. Increase the confidence level. II. Increase the sample size. III. Increase the margin of error. A. I ...
March 29, 2014

Statistics
Which of these statements is always true for a researcher who is using standard statistical methods in a test of significance? A. A researcher who rejects a true null hypothesis has committed a Type II error. B. A researcher who rejects the null hypothesis has computed a test ...
March 29, 2014

math
Enrique charges $5 for every 1/5 hour he spends walking dogs. In the morning he walks Buttons for 2/5 hour, Bruno for 1/5 hour, and Pepper for 3/5 hour, Monday through Friday. On Saturdays he takes Mimi, Diva, and Coco to the dog park for 4/5 of an hour. On Wednesday this week...
March 28, 2014

math
thank you just wanted to clear it .thanks to clear my doubth
March 26, 2014

math
36/1.5 = ? how to divide this
March 26, 2014

math
There are 50 big cats in the zoo.  2/5 of them are tigers.   1/5 of them are leopards. The rest are lions. How many lions are there in the zoo?
March 26, 2014

math
kevin bought a 3-foot sandwich for his .Hew figured out that each guest can have 1 1/2 inches of the sandwich . HOW MANY guest does kevin have
March 24, 2014

physics
Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help
March 23, 2014

statistics
Consider a binomial experiment with 20 trials and a probability of 0.45 on a single trial.Use the normal distribution to find the probability of exactly 10 successes.
March 21, 2014

physics
What is the momentum of the 200 g cart BEFORE the collision (LEAVE OUT units of kgm/s)? please help.
March 20, 2014

physics
if the cart in the last question collides INELASTICALLY with a stationary cart of mass 150 g, what is the kinetic energy of the carts after the collision (LEAVE OUT units of J)?
March 20, 2014

Investment interest
Scenario: A client comes to you for investment advice on his $500,000 winnings from the lottery. He has been offered the following options by three different financial institutions and requests assistance to help understand which option would be the best for his investment. ...
March 15, 2014

Physics
497.67
March 14, 2014

Which of the following is a compound?
c, CO
March 13, 2014

Language book
Hi i need help with this book called as for me and my house could you help me with this question When mrs. Bentley decides to plant a garden, the main problem is that according to propriety the mistress of the parsonage should not ___________ a.sow b.weed c.water d.dig Thanks ...
March 13, 2014

science (check answer?)
Well i also learned this so i got the same question from my school and the answer was they are all metals. Its 100% right
March 13, 2014

Biology
Are my answers correct? 1. What term describes the relationship of the ankle to the hip? Medial Proximal Distal this one Superior Anterior 2. What term describes the relationship of the nose to the mouth? Superior- this one Deep Anterior Inferior Superficial
March 12, 2014

Calculus
17
March 11, 2014

physics
An outfielder throws a 1.65 kg baseball at a speed of 59 m/s and an initial angle of 14.2◦. What is the kinetic energy of the ball at the highest point of its motion?
March 9, 2014

Finance
Cindy has an income of 56,000 in year 0. Calculate her income in year 1 if she wants to consume 40,000 in year 0 and 27,000 in year 1. Assume that the interest rate is 1.5 % per year.
March 6, 2014

research
What are the pros and cons of disguised observation?
March 5, 2014

chemistry 1
DDT concentrations in ground water. How do you set it up with a sample size of 250.0mL and the mass of DDT at 0.030 and then convert to millimoles. Just can't remember how to set it up.
March 4, 2014

Math
Thank
March 4, 2014

Math
How to set up an equation for this problem? Thank you.
March 4, 2014

Math
Mr. Bailey mowed his yard in 90 minutes. His son Roy mows the yard in 75 minutes. How long will it take them if they work together (using 2 lawn mowers)?
March 4, 2014

algebra
Brandon hit a baseball upward with an initial speed of 120 feet per second. How much later did Ollie catch the ball? Use the formula h = -16t squared + vt.
March 4, 2014

Physics
A ball is dropped from a height of 1.45m and rebounds to a height of 1.21m. Approximately how many rebounds will the ball make before losing 92% of its energy?
March 3, 2014

math
a telephone pole is 64 feet long and 5/16 of the pole must be underground a) what fraction of the pole is above ground
March 2, 2014

Precalculus
A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40 cos t and y=-50 + 30 ...
March 2, 2014

Precalculus
That's wrong :( It's not 2pi/3 or pi
March 2, 2014

Precalculus
Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?
March 2, 2014

Precalculus
-9 is incorrect, sorry. The answer is also not 6 or -6
March 2, 2014

Precalculus
Find the sum of all possible values of the constant k such that the graph of the parametric equations x=2+4cos(s) and y=k-4sin(s) intersects the graph of the parametric equations x=1+cos(t) and y=-3+sin(t) at only one point.
March 2, 2014

Precalculus
Find the sum of all possible values of the constant k such that the graph of the parametric equations x=2+4cos(s) and y=k-4sin(s) intersects the graph of the parametric equations x=1+cos(t) and y=-3+sin(t) at only one point.
February 28, 2014

Precalculus
Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?
February 28, 2014

Precalculus
A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40 cos t y=-50 + 30 cos t ?
February 28, 2014

Math
Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
February 27, 2014

Math
R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
February 27, 2014

Math
Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
February 26, 2014

Math
R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
February 26, 2014

Math
Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
February 26, 2014

Math
R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
February 26, 2014

Chemistry
When 10.00g of phosphorus is burned in O2(g) to form P4O10(s), enough heat is generated to raise the temperature of 2990g of water from 18.0 ∘C to 38.0 ∘C. Calculate the heat of formation of P4O10(s) under these conditions. -------------------------------------- ...
February 25, 2014

Finance
i don't know
February 25, 2014

Math
Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
February 25, 2014

Math
R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
February 25, 2014

math
mollly uses 192 beads to make a necklace and a bracelet. it takes 5 times as many beads to make a necklace than it does to make a bracelet. How many beads are used to make the necklace?
February 25, 2014

english
1.Virtual reality systems can be used to train pilots, doctors, and engineers. These systems are seen most often in video games. 2. a head-mounted display is made of a headset with a screen for each eye. the display connects to a computer. 3. a tracking device senses the eye ...
February 25, 2014

Math
John is designing a redwood deck. each board is 5 1/2 inches wide, and each will be placed parallel to one another. Should he use 3/16 inch, 1/4 inch, or 3/8 inch spacing between boards if he wants the deck to be as close as possible to, but not greater than, 18 fet wide? How ...
February 25, 2014

Math
A carousel at Playland, contains 38 horses. each carousel ride takes 4 minutes, riders need 3 minutes to exit and newcomber require 3 minutes to pick a horse and hop on. A carousel ride costs $0.75. The carousel makes $88,239.00 a year. How many horses are occupied per ride, ...
February 25, 2014

Math
What is the maximum number of intersections that can be formed by n lines?
February 25, 2014

math
Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
February 25, 2014

Math
R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
February 25, 2014

Precalculus
In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few special ...
February 24, 2014

calculus
h(t)=tan theta (5pie/3,3pie) graph the function on the given interval
February 24, 2014

6th grade social studies
The second answer is:India.
February 24, 2014

Chemistry
A gas at 54◦C occupies 4.54 L. At what tem- perature will the volume be 3.04 L, assuming the same pressure?
February 23, 2014

chemistry
A sample of helium gas has a volume of 328 mL at 0.69 atm. What pressure is needed to reduce the volume at constant temperature to 32 mL?
February 23, 2014

mat/116
WHATS THE EQUATION FOR THAT PROBLEM
February 23, 2014

Physics
You and some friends go bungee jumping, but you are afraid of oscillations which go too fast. Which one of these options would provide the slower oscillations? a) Tying two bungee cords to your feet such that each bungee cord is attached to your feet and the object which you ...
February 22, 2014

Math
209
February 20, 2014

Pre-Calc
One side of the barn counts as an enclosure.
February 19, 2014

Pre-Calc
A farmer is making a pig pen next to the barn. He has enough materials to build 50 feet of fencing. a)what is the largest area he can fence in? b)what are the dimensions of the pen with the largest area?
February 19, 2014

Math
Use the Rational Zeros Theorem to write a list of all possible rational zeros of the function. -2x^4+4x^3+3x^2+18
February 18, 2014

math
1-tan^2 theta/1+tan^2 theta + 2sin^2 theta need to simply to sin and cos
February 17, 2014

Problem solving
30
February 17, 2014

Chemistry
So (650)(25)/248=353(x)/298 65.5241=.8441/(x) 55.3=x got it right thanks Dr.Bob
February 15, 2014

Chemistry
If a sample of gas occupies 25.0 mL at -25°C and 650 mmHg, what is the volume at 25°C and 353 mmHg? (Could you please show me step by step?)
February 15, 2014

Physics
sin^-1(y/x)
February 15, 2014

Physics
Calculate the gravitational force between the Sun and Saturn. The mass of the Sun is 1.99×1030 kg. The mass of Saturn is 5680×1023 kg. The distance between them is 143×1010 m. In Newtons
February 13, 2014

Math
I have $35,000 in holding since 1997 earning an interest rate of 3%. How much is this worth today in $
February 13, 2014

strayer university
The Lo Company earned $ 2.60 per share and paid a dividend of $ 1.30 per share in the year just ended. Earnings and dividends per share are expected to grow at a rate of 5 percent per year in the future. Determine the value of the stock: A. if the required rate of return is 12...
February 13, 2014

chemistry
2 nacl (aq) + h2so4 ==> na2so4 (aq) + 2 hci (g)
February 13, 2014

physics
if the capacitance meter applies a voltage of 3.0 V across the plates and reads a capacitance of 30 pF, what is the charge on the plates?
February 13, 2014

physics
A projectile is fired into the air from the top of a cliff of height h = 208 m above a valley. Its initial velocity is v0 = 55.2 m/s at an angle θ = 54° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
February 12, 2014

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