Thursday
October 23, 2014

Posts by tracy


Total # Posts: 751

math
Question: The price of a home is $180,000. The bank requires a 10% down payment. After the down payment, the balance is financed with a 30 year fixed mortgage at 6.3%. Determine the unpaid balance after ten years. Answer: The unpaid balance after ten years is $136,641.85 I ...
November 5, 2012

chemistry
a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
November 3, 2012

chem
a volume of 122mL of argon, Ar, is collected at 500 degrees C and 758 torr. what does this sample weigh?
November 3, 2012

CHEM
what volume would 10.5g of nitrogen gas, N2, occupy at 200.K and 2.02atm?
November 2, 2012

chem
in a. I got 60 L for volume and .8 moles(.2+.6moles. now in b. i got .16 mole so where do I subtract .16 from should I subtract it from .8 moles or from the initial mole which is .2 mole
November 1, 2012

chem
A sample containing 6.40 g O2 gas has a volume of 15.0 L. Pressure and temperature remain constant. a. What is the new volume if 0.600 mole O2 gas is added? b. Oxygen is released until the volume is 12.0L. How many moles of O2 are removed? c. What is the volume after 7.50 g He...
November 1, 2012

chem
How are we able to determine that jupiter is mostly methane gas and that the surface of the sun is mostly He and H? can anyone help me pls
October 30, 2012

chem
How are we able to determine that jupiter is mostly methane gas and that the surface of the sun is mostly He and H? can anyone help me pls.
October 30, 2012

chem
if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O
October 19, 2012

math
A group medical practice has 40,000 patients. Charts vary in thickness from 1/4 to 1 inch thick. The average of all charts is 1/2 inch thick. Using the average 1/2 inch thickness, how many inches of shelf space will be required for 40,000 charts?
October 16, 2012

chemistry
if the mass of a metal is 127.70 grams, what is number of moles on the metal in the cube?
October 16, 2012

chemistry
How many water molecules are in the recommended volume of water (1.50L) that should be consume daily?
October 10, 2012

chemistry
what volume of water should be weighted out to represent one mole of water molecules at 20 degree C
October 10, 2012

chemistry
could donuts be quantified in terms of mass instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say...
October 10, 2012

chemistry
could donuts be quantified in terms of instead of number explain? here's my answer but not sure of it: sure...but, since the mass of donuts varies, if you ordered say a pound of donuts at dunken donuts, you may get a partial donut or two. for that matter let's say you ...
October 10, 2012

chemistry
invent a term to describe a certain number of something you use that isn't already being used. Define and explain
October 9, 2012

chemistry
Assuming that the price of god is $11,000.00/Kg, What is the approximate $value of one mole of gold atoms?
October 9, 2012

chemistry
oh then good thanks a lot
October 5, 2012

chemistry
When will hydrogen bonding occur?Give an example of liquid other than H2O in which this type of force is important. In order for a hydrogen bond to occur there must be both a hydrogen donor and an acceptor present. The donor in a hydrogen bond is the atom to which the hydrogen...
October 5, 2012

chemistry
thank you
October 5, 2012

chem
so wrong post
October 5, 2012

chem
thanks now I understand way to go
October 5, 2012

chemistry
thanks a lot i was waiting for your comment
October 5, 2012

chemistry
Based on their boiling point, CH3CH2OH bpt. 78C, CH3CH2CH2OH bpt. 97C, CH3CH2CH2CH2OH bpt. 118 C how will I be able to rank these three in terms of strength of their IMF.Pls kindly explain it they gave this a a homework and never been discussed in class. thank you
October 5, 2012

chemistry
Rank C2H6O, C3H8O and C4H^10 O in terms of IMF and explain their structures? neeed heeelppp.thank you
October 5, 2012

physics
How high will a 1.85 kg rock go if thrown straight up by someone who expends 80.0 J of energy on it?
September 29, 2012

Science
How do you show a car constant speed Horizontal line or vertical
September 17, 2012

Physics
A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet's speed is 350 m/s, how far below the bull's eye does the bullet strike the target?
September 10, 2012

Physics
An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
September 10, 2012

Physics
An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
September 10, 2012

Physics
A rifle is aimed directly at the bull's eye of a target 50m away. If the bullet speed is 350 m/s, how far below the bull's eye does the bullet strike the target?
September 10, 2012

basic statistics
What is construct a 95 percent confidence interval about the sample mean N= 11?
August 6, 2012

human growth and Development11
Samuel,a50-year-old psychologist, claims that he is a victim of"revolving door syndrome" What is Samuel's problem?
July 15, 2012

Physics
A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
June 29, 2012

Physics
A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
June 29, 2012

algebra
L= 2+2W perimeter = 2L+2W 28=2L + 2W 28=2(2+2W) + 2W 28=4+4W+2W 28=8W+2W 28=10W 28/10=W W=2.8
June 20, 2012

math
2(x-3)=(14-x)/5 10(x-3)=14-x 10x-30=14-x 11x-30=14 11x=44 x=4
June 20, 2012

Physics
wait nevermind i got it. i put in the wrong number. thanks :D
June 20, 2012

Physics
i did that for part a but i got 2.73 and the answer says its 2.87
June 20, 2012

Physics
A simple pendulum 1.50 m in length has a 500-g putty ball as an end bob. The pendulum is pulled aside 60° from the vertical and given an initial tangential speed of 1.20 m/s. At the bottom of the arc path, the bob hits and sticks to a 200-g putty ball sitting on a tee. (a...
June 20, 2012

accounting
kathy burnett works for trinity industries. Her pay rate is 12.84 per hour and receives overtime pay at one and one-half times her regular hourly rate for any hours worked beyond 40 in a week. During the pay period that ended December 31,2013, Kathy worked 48 hours. Kathy is ...
June 15, 2012

math
Find the distance to the horizon @ 32,000 feet.
May 16, 2012

MATH
An object is fired vertically upward with an initial speed of 68.6 meters per second. After t seconds, the height is shown by y = 4.9t^ + 68.6 t meters. Given that this object has an initial speed of 68.6 m/s, what is the maximum height it will reach?
April 26, 2012

biology
need help with a paper from news article on human biology using scientific method?
April 21, 2012

Pre-Algebra 2
write a rule for the linear function in the table x 1, 2,3,4, f(x) -7, -10,-13,-16
April 11, 2012

acids
Which of the following bases is the weakest? (CH3)2NH , Kb = 5.1 x 10–4 ClO–, Kb = 2.9 x 10–7 SO42–, Kb = 8.3 x 10–13
April 4, 2012

applied physics
Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions
April 1, 2012

math
simplify 15xy/35x
March 28, 2012

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 12, 2012

Physics
What is the magnitude of buoyant froce acting on a 720 cm^3 toy submarine foating in fresh water? (d water=1 g/cm^3)
March 12, 2012

Physics
A spring and block is set up on frictionless tabletop. The 30N/m spring is compressed 16 centimeters and released. What is the maximum speed the 2.0 kilogram block will reach?
March 12, 2012

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 12, 2012

Physics
A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place? Is this answer right: 7800/10130 = 0.770
March 12, 2012

Physics
Use the first law of thermodynamics to determine the amount of heat change, Q, and whther it was added to or removd from the system. W=225J Delta U=600J Q=?
March 11, 2012

Physics
A spring and block is set up on frictionless tabletop. The 30N/m spring is compressed 16 centimeters and released. What is the maximum speed the 2.0 kilogram block will reach?
March 11, 2012

Physics-Is this correct?
A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place? answer: 7800/10130 = 0.770
March 11, 2012

Physics-is this correct?
A person heats up a can of soup on a stove. If he does 250 joules of work on the soup by stirring it as the burner adds 1675 joules of heat, what is the change in its internal energy? I took 1675j - 250 j = 1425j
March 11, 2012

Physics-is this correct?
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 11, 2012

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 6, 2012

Physics
Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...
March 6, 2012

social studies
what happened to florida at the end of the american revolution
March 6, 2012

Chemistry
thank you Dr. Bob!
March 5, 2012

Chemistry
and for the sake of understanding.. can someone tell me what would happen if the reaction was exothermic instead of endothermic?
March 5, 2012

Chemistry
Consider this system at equilibrium. A(aq) <-> B(aq) Delta H = +750 kJ/mol .. What can be said about Q and K immediately after an increase in temperature? a] Q > K because Q increased.. b] Q>K because K decreased.. c] Q<K because Q decreased.. d] Q<K because ...
March 5, 2012

Chemistry
OHH (2.567)^2*0.637 = 4.197?! .. or was that a fail epiphany
March 5, 2012

Chemistry
Hi Dr. Bob, (3.03)^2 * 0.637 = 5.85? What would I do with the first equation that i got?
March 5, 2012

Chemistry
If someone could please be kind enough to see me through this problem? Calculate the value of Kp for the equation C(s) + CO2(g) <--> 2CO(g) Kp? Given that at a certain temperature.. C(s) + 2H2O(g) <--> CO2(g) + 2H2(g) Kp1 = 3.03 and H2(g) + CO2(g) <--> H2O(g...
March 5, 2012

Chemistry
thank you!
March 5, 2012

Chemistry
In which direction will the net reaction proceed. X(g) + Y(g) <==> Z(g) .. Kp = 1.00 at 300k for each of these sets of initial conditions? 1) [X] = [Y] = [Z] = 1.0 M a] net reaction goes to the left [this one?] b] net reaction goes to the right c] reaction is at ...
March 5, 2012

Physics
It takes 1110 calories of energy to melt a 185 gram lump of lead. What is lead's latent heat of fusion?
March 5, 2012

Physics
A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from that water to chill its temperature from 55 c to 4 c? Q = m(c)(delta t) Q = (100g)(1.0 c/g*c)(51c) = 40,800 Is the answer correct?
March 5, 2012

Physics
Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...
March 5, 2012

Physics
Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...
March 5, 2012

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will require 721.5 calories ...
March 5, 2012

Chemistry
Thank you so much Dr. Bob
March 5, 2012

Chemistry
For A+2B <-> 2C and Kc = 2.13 For 2C <-> D and Kc = 0.254 Calculate the value of equilibrium contant for the reaction D <-> A+2B I'm so sorry to bother anyone.. but am i only supposed to multiple 2.13 and 0.254 together in order to get the third value of ...
March 5, 2012

Chemistry
Thank you for proofreading!
March 5, 2012

Chemistry
At 389K, this reaction has a Kc value of 0.0682. 2X(g) + 2Y(g) <-> Z(g) .. Calculate Kp at 389K. Kp= this is what I did.. can somebody confirm or find any mistakes in my thought process? Kp = Kc(R)(T)^Delta n Delta n = (1)-(2+2) = -3 Kp = (0.0682)(0.08206)(398K)^-3 = 0....
March 5, 2012

Chemistry
ohhh it was no effect and no effect for 1 and 3 i got it
March 5, 2012

Chemistry
Ohh i understand Dr. Bob. So in terms of adding more.. would that be the same as increasing concentration? For example: S(s) + O2(g) <-> SO2 1] how will adding more S(s) shift the equilibrium? a] to the right [this?] b] to the left c] no effect 2] How will removing some ...
March 5, 2012

Chemistry
Did I answer this equilibrium question correctly? 2CO(g) + O2(g) <-> 2CO2(g) 1) How will increasing the concentration of CO shift the equilibrium? a] to the right [i chose this] b] to the left c] no effect 2] how will increasing the concentration of CO2 shift the ...
March 5, 2012

Physics
Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely?
March 4, 2012

Physics
Which of the following statatements is correct? a. Thermos bottles keep food warm by combating heat loss through convection. b. A thick quilt is an example of an isulator with a low R value c. An object that is cool to the touch at room temperature is a poor conductor of heat ...
March 4, 2012

Physics
A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from the water to chill its temperature from 55 C to 4 C?
March 4, 2012

Physics
A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from the water to chill its temperature from 55 C to 4 C?
March 3, 2012

Physics
A person heats up a can of soup on a stove. If he does 250 Joules of work on the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal energy
March 3, 2012

Physics
At the lowest point in its swing, a 2.5 kilogram pendulum bob has 40 Joules of kinetic energy. How high will its swing when it reaches the highest point in its swing?
March 3, 2012

Physics
What is the magnitude of buoyant force acting on a 720 cm^3 toy submarine floating in fresh water? (D_water =1 g/cm^3)
March 3, 2012

PHYSICS
A 25,000 kilogram train is traveling down a track at 20 meters per second. A cow wanders onto the tracks 75 meters ahead of the train, causing the conductor to slam on the brakes. The rain skids to a stop. If the brakes can provide 62,500 Newtons of friction, will the ...
February 28, 2012

PHYSICS
A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2...
February 28, 2012

physics
a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help power= work/time= 1/2 m v^2/8 1/2(1500k)(30)^2 2/8 =168750 is this correct?
February 27, 2012

physics
A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2...
February 27, 2012

physics
a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help power= work/time= 1/2 m v^2/8 1/2(1500k)(30)^2 2/8 =168750 is this correct?
February 26, 2012

Physics
A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. 1/2 m v^2= mgh v= sqrt (2g*(3+.5)) V=sqrt(2...
February 26, 2012

PHYSICS
a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help
February 26, 2012

PHYSICS
A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance.
February 26, 2012

PHYSICS
A 25,000 kilogram train is traveling down a track at 20 meters per second. A cow wanders onto the tracks 75 meters ahead of the train, causing the conductor to slam on the brakes. The rain skids to a stop. If the brakes can provide 62,500 Newtons of friction, will the ...
February 26, 2012

Living ENvironment
In a hydrolysis reaction (enzyme) the bonds in substrate are weakened right always
February 22, 2012

Algebra
2= 10+z/-3
February 22, 2012

Chemistry
got it thank you!
February 18, 2012

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