Thursday
November 27, 2014

Posts by Dan


Total # Posts: 904

math
there are 15 boys and 18 girls in fifth grade. Find the ratio of boys to girls in fifth grade.(how do I get the answer) can someone show me how to work the problem
October 1, 2012

Physics
12 ft
September 30, 2012

math
is there an equation for this?
September 24, 2012

math
an object released from rest will fall 16t^2 feet, t seconds after it is dropped. 2 pebbles are dropped, one after the other, from a cliff that is 64 feet high. the 2nd pebble is released the instant the first pebble has fallen exactly one foot. how far above the ground is the...
September 24, 2012

math
consider the equation x^2+kx+1=0 a single fair die(dice)is rolled to determine the value of the middle coefficient, k. the value for k is the number of dots on the upper face of the die. what is the probability that the equation will have real, unequal roots?
September 19, 2012

Physics
A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? Equation to use?
September 17, 2012

Physics
A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? What equation would I use for this?
September 17, 2012

trigonometry
Suppose θ is an angle in standard position whose terminal side lies in Q II. If sin θ = 13 12 , find sec θ.
September 17, 2012

physics
An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?
September 13, 2012

physics
An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?
September 13, 2012

physics
A river flows due east at 2.00 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.0 m/s due north relative to the water.
September 13, 2012

Math
1. b 2. c 3. c 4. a
September 13, 2012

physics
A 5.21 box sits on a ramp that is inclined at 37.8 above the horizontal. The coefficient of kinetic friction between the box and the ramp is 0.29. What horizontal force is required to move the box up the incline with a constant acceleration of 4.00 ?
September 12, 2012

math
malik paid 480$ to purchase a certain number of pizzas, but 2 extra were delivered which decreased the amount per pizza by 1$. how many pizzas were delivered?
September 12, 2012

math
Computers manufactured by a certain company have a serial number consisting of a letter of the alphabet followed by a five-digit number. If all the serial numbers of this type have been used, how many sets have already been manufactured?
September 11, 2012

economics
Say your parents give you a car for your birthday. It is not the new model you wanted, but it's in very good condition. They bought it used for $15,000 (market value). The cost of keeping the car to you is (not counting maintenance and operation cost) is:
September 2, 2012

economics
Say your parents give you a car for your birthday. It is not the new model you wanted, but it's in very good condition. They bought it used for $15,000 (market value). The cost of keeping the car to you is (not counting maintenance and operation cost) is:
September 2, 2012

accounting
A company purchased a machine on January 1 of the current year for $750,000. Calculate the annual depreciation expense for each year of the machine's life (estimated at 5 years or 20,000 hours, with a salvage value of $75,000). During the machine's 5-year life its ...
August 25, 2012

Physics
When a resistor is connected across the terminals of an ac generator (112 V) that has a fixed frequency, there is a current of 0.500 A in the resistor. When an inductor is connected across the terminals of this same generator, there is a current of 0.400 A in the inductor. ...
August 5, 2012

Physics
When a resistor is connected across the terminals of an ac generator (112 V) that has a fixed frequency, there is a current of 0.500 A in the resistor. When an inductor is connected across the terminals of this same generator, there is a current of 0.400 A in the inductor. ...
August 3, 2012

math
Oops I was thinking of 8 times 9 It's 126
July 29, 2012

math
72
July 29, 2012

math
Planets A, B and C orbit a certain star once every 3, 7, and 18 months respectively. If the three planets are now in the same straight line, what is the smallest number of months that must pass before they line up again?
July 29, 2012

PHY: To AJAYB, follow up on previous response
First, I'd like to thank you for your response to my question. However, I had some follow up questions on your response from Saturday, July 28, 2012 at 8:27am. If you could take a look at that post and get back to me, it would be greatly appreciated.
July 29, 2012

Physics- Repost (Answer did not make sense)
Thanks for your response, but I have a few questions. For part B, why is full battery voltage 6V, and not 12V? For part C, my question is once again about using 6V in the calculation for finding q0, as well as units. Using 6V, qo= 54 uC? For the time constant, I plugged in ...
July 28, 2012

Physics- Repost (Answer did not make sense)
In the circuit below, at time t = 0, the switch is closed, causing the capacitors to charge. The voltage across the battery is 12 V The circuit: flickr. com/photos/ 68751220@N03 /6848519773/ A)Calculate the time constant for the RC circuit B)Calculate the time required for the...
July 28, 2012

physics
I plugged the #'s into that site you supplied, but I still get my answer of 0.012 seconds, not the 1.2E-5 seconds you put?
July 27, 2012

physics
I meant 0.012 sec for part A
July 27, 2012

physics
In the circuit below, at time t = 0, the switch is closed, causing the capacitors to charge. The voltage across the battery is 12 V The circuit: flickr. com/photos/ 68751220@N03 /6848519773/ A)Calculate the time constant for the RC circuit B)Calculate the time required for the...
July 27, 2012

Physics
The work done by an electric force in moving a charge from point A to point B is 3.75 x 10^-3 J. The electric potential difference between the two points is VA - VB = 54.6 V. What is the charge? Not sure if I did this correctly: I believe this is an equation: deltaV= (-Wab)/q ...
July 25, 2012

physics
An object carries a charge of -8.0 uC, while another carries a charge of -2.0 uC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5uC Object 2- Qavg = 3uC 3E-6 C/1.6E-19...
July 23, 2012

Physics
Those "i" things before the "C" were supposed to be micro for microcoulombs
July 23, 2012

Physics
An object carries a charge of -8.0 ìC, while another carries a charge of -2.0 ìC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5ìC Object 2- Qavg...
July 23, 2012

chemistry 12
hey i was wondering, i have this question: Sketch a pH curve for the titration of 40.00mL of 0.100 M hydrazine, H2NNH2, having a K of 3.0x10^-6 by 0.100 M HCIO4 i know you can t sketch but could you tell me what to do with the "K of 3.0x10^-6" i could sketch the ...
July 17, 2012

MAth
A rectangle is 15 inches long and 6 inches wide. What is the area of the rectangle?
July 14, 2012

Math
If triangle ABC is similar to triangle DEF and the perimeter of ABC is 4 times greater than the perimeter of DEF , what is the relationship between the areas of the triangles?
July 12, 2012

Physics
You are explaining why astronauts feel weightless while orbiting in the space shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 248 km above the ...
July 8, 2012

math
Solve the following problems using Partial Quotients a. 7752/17 b. 651/3
July 7, 2012

math
The number of dogs and chickens on a farm add up to 14. The number of legs between them is 36. How many dogs and how many chickens are on the farm if there are at least twice as many chickens as dogs?
June 13, 2012

math
Find the sum of the arithmetic progression 4 + 9 + 14 + 19 + …….94 + 99 + 104
June 13, 2012

sceince
close, you need to change your theta. A) 250(1.7)cos35 B) 250(3.2)cos55 this will work, just did it for my homework and they are correct. My E and A are different but the theta was the same.
June 10, 2012

Finance
John Jones buys a flat screen TV costing $1200. He pays $200 down and finances the balance at 15% add-on interest, to be repaid in 18 monthly installments. Find the finance charge
May 27, 2012

AP CHEMISTRY
Thank you very much
May 27, 2012

AP CHEMISTRY
Please could you help me predict the products of the following reactions: ( I cant figure them out) THANX in advance! 1) CaO powder is added to distilled water. 2) Acetic acid solution is added to solid sodium hydrogen carbonate. 3) Potassium permanganate solution is added to ...
May 27, 2012

math
If E and F are events with P ( E ∩ F ) = 0.09 and P ( E F ) = 0.3 , P ( F E ) = 0.4 Find P (F )
May 25, 2012

ALGEBRA II
ln(x+5)=4 COULD YOU SHOW HOW TO SOLVE THIS STEP BY STEP. THANX!
May 23, 2012

Physics
Sorry - got cut off. I meant to supply R * V(rel) = Ma
May 22, 2012

Physics
A railroad car moves under a grain elevator at a constant speed of 3.70 m/s. Grain drops into the car at the rate of 580 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible? F = Ma -> R * V(rel)
May 22, 2012

US HISTORR
why did the league of nations not pursue italy? Like after WW2. Did the Italians get angry because of something the league of nation did or didn't do for them ?
May 21, 2012

US HISTORY
why did the league of nations not pursue italy? Thanx!
May 21, 2012

US HISTORY
thanx!
May 21, 2012

US HISTORY
what decided the outcome of the 2000 election??
May 21, 2012

AP CHEMISTRY
Thanx!!!
May 20, 2012

AP CHEMISTRY
What does a negative value for a standard potential indicate? PLEASE HELP!!
May 20, 2012

CHEMISTRY
yeah i get that, and so what would you write acetic acid as, just the same?? And also thanx for explaining above
May 13, 2012

CHEMISTRY
Write the formulas for the following substances as they would appear in a total ionic equation: a) Aqueous acetic acid b) solid lithium carbonate c) Aqueous ammonia d) Aqueous sodium dihydrogen phosphate I don't know, do we have to write the formula [like ammonia is NH3] ...
May 13, 2012

CHEMISTRY
Use the solubility rules to predict whether the following substances are soluble or insoluble in water: a) K2CrO4 _______________ b) NiSO4 _______________ c) Cu(OH)2 ______________ d) Pb(C2H3O2)2 __________ e) Ag2CO3 _______________ f) Al2S3 ________________ Please help me ...
May 13, 2012

physics
An 21.0 , 12.0 , and 5.0 resistor are connected in series with an emf source. The current in the 12.0 resistor is measured to be 4.00 A.
May 10, 2012

physics
how do you solve for Potential Energy?
May 10, 2012

physics
In the 1950s, an experimental train that had a mass of 3.30 104 kg was powered across level track by a jet engine that produced a thrust of 4.90 105 N for a distance of 600 m. (a) Find the work done on the train. 1 J (b) Find the change in kinetic energy. 2 J (c) Find the ...
May 10, 2012

Physics
I got 15.6 but it was wrong? Ace raised a 14.0-N physics book from a table 72 cm above the floor to a shelf, 2.20 m above the floor. What was the change in potential energy?
May 10, 2012

physics
Pam has a mass of 33.0 kg and she is at rest on smooth, level, frictionless ice. Pam straps on a rocket pack. The rocket supplies a constant force for 15.0 m and Pam acquires a speed of 60.0 m/s. (a) What is the magnitude of the force? 1 N (b) What is Pam's final kinetic ...
May 10, 2012

ENGLISH 11
Could someone please tell me the following for each person in the book THE GREAT GATSBY; -Age, Work, and Major Accomplishment for: Daisy Buchanan, ------Jay Gatsby, & ------Jordan Baker
May 8, 2012

algebra
Simply 5 hours.. 125 miles/25 miles/hour = 5 hours
May 7, 2012

Physics
Cost ($) = Power (kW) x Price ($ / kWh) x Time (h) Cost ($) = (0.006 kW) x ($0.12) x (365 days/year x 24 h/day) Cost = $6.3072
May 7, 2012

Living a Healthy Life
the answer should be C. pretty confident about that. :)
May 7, 2012

Physics. Need urgent help.
A scuba diver searches for treasure at a depth of 20.0m below the surface of the sea. at what pressure must the scuba device deliver air to the diver? (density of sea water= 1030kg/m^3;atmospheric pressure= 1.013x10^5 pa) another one A king's crown is said to be solid gold...
May 6, 2012

phi 103
the answer is apparently number one, and I choose number three as being not falsifiable. I am currently arguing my point and could use some support. My proof that three of the four claims are falsifiable are as follows. My luck may improve or it may not. I could die ...
May 5, 2012

phi 103
Which of the following may not qualify as a falsifiable claim? Student Answer: Your luck will improve. Your house will be sold tomorrow. Granite is more dense than sand. Smoking may cause heart disease
May 5, 2012

Earth & Space Science
Could someone please tell me what do you do in this class. I'm going to be a senior next year [High School] , & thinking of taking this class. And also if someone could tell me where to find notes for that class. THANK YOU!
May 2, 2012

AP CHEMISTRY
Could someone please tell me where to find the 2008 AP Chemistry Multiple Choice for FREE ONLINE? Thank You in advance!
May 1, 2012

phi 103
A claim is also said to be falsifiable, in that it could turn out actually to be false, and we know how that might be shown. For instance, "There are no wild kangaroos in Georgia" is a falsifiable claim; if we went to Georgia and found some wild kangaroos, we would ...
April 30, 2012

phi 103
I'm sorry, I gave the answer, "Granite is more dense than sand." It was marked as incorrect, I feel this must be an error. Thank you once again!
April 30, 2012

phi 103
Exactly, how I answered the question. Would you say this is answered incorrectly in the text?
April 30, 2012

phi 103
Which of the following may not qualify as a falsifiable claim? Your luck will improve. Your house will be sold tomorrow. Granite is more dense than sand. Smoking may cause heart disease
April 30, 2012

phi 103
Thank you!
April 30, 2012

phi 103
correct, but can always be revised necessarily true meaningless but fun correct and never needing revision
April 30, 2012

phi 103
strongly supported claim in science should be regarded as?
April 30, 2012

phi 103
If the word "should" appears in a sentence, that sentence will always involve an ethical claim
April 30, 2012

Chemistry
I am very confused about how to start this problem: A 29.8 mL sample of 0.354 M methylamine, CH3NH2, is titrated with 0.231 M hydrochloric acid. The pH before the addition of any hydrochloric acid is ?. The Kb of methylamine is 4.2x10^-4
April 28, 2012

Chemistry
How do I do this problem, I am very confused on how to even begin: An aqueous solution contains 0.167 M ascorbic acid (H2C6H6O6) and 0.194 M hydroiodic acid. Calculate the ascorbate (C6H6O62-) ion concentration in this solution. [C6H6O62-] =? mol/L.
April 28, 2012

AP CHEMISTRY
A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e− -> Cu(s) I2(s) + 2 e− -> 2 I−(aq) The cell is operated at 298 K with [Cu+ ] = 2.7 M and [I− ] = 2.7 M. (a) Determine E for the cell at these concentrations. (b...
April 14, 2012

AP CHEMISTRY
A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-] is 1.0 x 10^-2 M. Some Fe(OH)2 precipitates. The value of Ksp for Fe(OH)2 = 8.0 x10^-10. (A) Assuming that the hydroxide is 1.0 x 10^-2 M, calculate ...
April 11, 2012

AP CHEMISTRY
For Ni its -0.28V & for Fe its -.440V Is it right?
April 11, 2012

AP CHEMISTRY
A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-] is 1.0 x 10^-2 M. Some Fe(OH)2 precipitates. The value of Ksp for Fe(OH)2 = 8.0 x10^-10. A. Assuming that the hydroxide is 1.0 x 10^-2 M, calculate ...
April 11, 2012

MATHEMATICS
how did u get those numbers?
April 9, 2012

MATHEMATICS
How do you find the average deviation from these numbers: 290 , 270 , 250 , 300 , & 290. I think their mean is 280
April 9, 2012

MATHEMATICS
A piece of notebook paper is about 0.0032 inch thick. If you begin with a stack consisting of a single sheet and double the stack 25 times, how tall will the stack be in inches? How tall will it be in feet? (Hint: Write and solve an exponential equation to find the height of ...
April 8, 2012

AP CHEMISTRY
A voltaic cell is constructed that is based on the following reaction. Sn2+(aq) + Pb(s) -> Sn(s) + Pb2+(aq) (a) If the concentration of Sn2+ in the cathode half-cell is 1.80 M and the cell generates an emf of +0.219 V, what is the concentration of Pb2+ in the anode half-...
April 6, 2012

PHYSICS
thanx!!
April 3, 2012

PHYSICS
Is it 32.57 cm?
April 3, 2012

PHYSICS
Allegra's favorite ride at the Barrel-O-Fun Amusement Park is the Flying Umbrella, which is lifted by a hydraulic jack. The operator activates the ride by applying a forcce of 72 N to a 3.0-cm-wide cylindrical piston, which holds the 20000. N ride off the ground. What is ...
April 3, 2012

Accounting
Presented below are selected financial statement items for Rowe Corporation for December 31, 2012. Inventory $55,000 Cash paid to purchase equipment $30,000 Cash paid to suppliers 154,000 Equipment 40,000 Buildings 400,000 Revenues 200,000 Common stock 20,000 Cash received ...
April 2, 2012

Chemistry
At 1 atm, how much energy is required to heat 39.0 g of H2O(s) at –22.0 °C to H2O(g) at 163.0 °C?
March 28, 2012

AP CHEMISTRY
The Kb for ammonia (NH3) at 25°C is 1.8* 10-5. By using the value of Kb, calculate ΔG° for the equilibrium
March 23, 2012

calculus
If the sun rises at 6 AM and is directly overhead at 12 noon, estimate the time (hour and minutes) when a 34-foot tree will have a 24-foot shadow.
March 23, 2012

AP CHEMISTRY
i still don't get the right answer i have like 1.54*10-14
March 20, 2012

AP CHEMISTRY
So do i plug in 270C in kelvin as my temp in the first formula???
March 20, 2012

AP CHEMISTRY
Consider the reaction. PbCO3(s)<--> PbO(s) + CO2(g). calculate the equilibrium pressure of CO2 in the system at the following temperatures.(IN atm) (a) 270°C (b) 480°C ..... delta Hf(KJ/mol).. d.Gf(KJ/mol).. S(J/mol-K) PbCO3(s)..-699.1 .. -625.5 .. 131.0 PbO(s...
March 20, 2012

AP CHEMISTRY
I really need this please!!!!!!! : write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s)<--> NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: ...
March 19, 2012

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