Thursday
September 18, 2014

Posts by Kate


Total # Posts: 1,686

Math
Determine the present value of the annuity: $1500 at the end of each 3-month period, for 5 years, at 4.5% p/a, compounded quarterly
July 12, 2011

Math
Imagine you have invested $500 in an account that pays 5% simple interest per year. Can you find an arithmetic sequence to look for the amount of money in the account after 20 years?
July 12, 2011

Physics
If you go to google and type "conservation of momentum photogate lab penn state" this is just like the experiment we performed. It should be the top result "Physics 250 Laboratory: Conservation of Momentum. Hope this helps.
July 11, 2011

Physics
So I had an exam today and one of the questions is bugging me. Our professor is out of town for a few days, so we had a proctor and I still can't figure it out using my notes. It was a question about two carts and deals with momentum. Cart A is at rest between two ...
July 11, 2011

Physics
So I had an exam today and one of the questions is bugging me. Our professor is out of town for a few days, so we had a proctor and I still can't figure it out using my notes. It was a question about two carts and deals with momentum. Cart A is at rest between two ...
July 11, 2011

Math
tn - tn-1 = 2n + 3; t1 = 10 Find the first five terms in the sequence using this recursive formuls
July 11, 2011

Math
tn - tn-1 = 2n + 3 Find the first five terms in the sequence using this recursive formuls
July 11, 2011

chemistry
How many grams of acetic acid (MW = 60 g/mol, pKa=4.75) are needed to change 1000 L of water with a pH of 11 to a pH of 5.5?
July 8, 2011

MATH
Halley's comet appears in the sky approximately once every 77 years. If the comet was seen in by Astronomer Edmund Halley in 1531. How many times has the comet been spotted since?
July 8, 2011

chemistry
How many grams of HCl are needed to change 1000 L of water with a pH of 11 to a pH of 5.5?
July 8, 2011

PHYSICS
A 240 g block on a 41 cm-long string swings in a circle on a horizontal, frictionless table at 73 rpm. (a) What is the speed of the block? (b) What is the tension in the string?
July 7, 2011

physics
A 5.0 m diameter merry-go-round is initially turning with a 4.6 s period. What is the speed of a child on the rim?
July 7, 2011

Math(Pre=Calc)
The first term in a sequence of number is t1 = 4. The terms that follow are defined by the formula: tn - tn-1 = 3n -2. Determine the value of t50.
July 6, 2011

physics
A penguin sliding on ice has an initial velocity of 5 m/s due north. Due to a strong wind, the penguin has an acceleration of 2 m/s2 SE. What is the penguin’s displacement (magnitude and direction) after 4 seconds
July 5, 2011

physics
Three forces act on a 3 kg box: 10 N South-west, 17 N North-west, 5 N due East. What is the acceleration of the box?
July 5, 2011

physics
You throw a ball downwards with a speed of 10 m/s. It hits the ground 4 meters below from where you threw it. How long is the ball in the air and what is the ball’s velocity just before it hits?
July 5, 2011

physics
A .5 m long, 3 cm diameter metal bar has a Young’s Modulus of 7.0x1010 N/m2. If a 50,000 N force is applied to the end of the bar, by how much will it compress?
July 5, 2011

speech
it has to be one describing word but i need two more and those websites were no help to me
July 3, 2011

Algebra 2
what number did they give you because you have to plug the answer in for X these are two differnt parts. The question is say use X+5 if x is greater than 0 or the answer is three if x is less than 0
July 3, 2011

physics
A 3.0 m tall, 42 cm diameter concrete column supports a 230,000 kg load. By how much is the column compressed? Assume Young's modulus for concrete to be 3.0 1010 N/m2. in mm
July 2, 2011

PHYSICS
a 10cm long spring is attached to the ceiling. when a 2.6kg mass is hung from it, the spring stretched to a length of 15cm. what is the spring constant k how long is the spring when a 4.0 kg mass is suspended from it
June 30, 2011

physics
a skater holds her arms outstretched as she spins at 140 rpm. What is the speed of her hands if they are 125 cm apart?
June 28, 2011

Physics
A 36 kg box hangs from a rope. What is the tension in the rope if the following are true? (a) The box moves up a steady 5.0 m/s? (b) The box has vy = 5.0 m/s and is slowing down up at 5.0 m/s2?
June 22, 2011

physics
thank you!
June 22, 2011

physics
A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that μs = 0.6 and μk = 0.3. (c) What is the maximum acceleration the belt can have without the crate slipping? (d) If acceleration of the belt exceeds the value determined in part (c), what...
June 22, 2011

physics
How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?
June 21, 2011

physics
How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?
June 21, 2011

PHYSICS
A 900 kg car pushes a 1900 kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4800 N. (a) What is the magnitude of the force of the car on the truck? (b) What is the magnitude of the ...
June 21, 2011

PHYSICS
Zach, whose mass is 67 kg, is in an elevator descending at 12 m/s. The elevator takes 3.5 s to brake to a stop at the first floor. (a) What is Zach's apparent weight before the elevator starts braking? (b) What is Zach's apparent weight while the elevator is braking?
June 19, 2011

physics
King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 54 m/s and at an angle of 34°. A cannonball that was accidentally dropped hits the moat below in 1.1 s.(a) (a)How far from the castle wall does the cannonball hit...
June 19, 2011

physics
A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 92 m above the glacier at a speed of 135 m/s. How far short of the target should it drop the package?
June 19, 2011

physics
A go-cart has an initial speed of 23.4 m/sec. Fifteen seconds later the go-cart has a final speed of 36.8 m/sec. What is the magnitude of the go-cart's displacement?
June 11, 2011

algebra
How do I write this number in scientific notation 1. 8.68x10^1 2.1,900,000
June 10, 2011

Physics
A bullet with mass 4.91 g is fired horizontally into a 1.981-kg block attached to a horizontal spring. The spring has a constant 6.25 102 N/m and reaches a maximum compression of 6.38 cm. a) find the initial speed of the bullet-block system. b) find the speed of the bullet
June 1, 2011

Pre-Calc
1. Square both sides. (x+5)^5=(x+5) 2. FOIL the left side. x^2+10x+25=x+5 3. Subtract x and 5 from both sides. x^2+9x+20=0 4. Factor. (x+5)(x+4)=0 5. Solve using the zero product property. x+5=0 x+4=0 x=-5 and x=-4
June 1, 2011

grammar
Is this sentence. Mr. and Mrs. Lopez's plane tickets, incidentally were found in the lobby. Is this correct punctuation?
May 29, 2011

Algebra
I could use some help on this please. Write a linear function that satisfies the given conditions: h(-1) = 4, h(0) = -5 Thanks!!!
May 22, 2011

Physics
In a physics lab experiment, a spring clamped to the table shoots a 18 g ball horizontally. When the spring is compressed 20 cm, the ball travels horizontally 4.9 m and lands on the floor 1.3 m below the point at which it left the spring. What is the spring constant?
May 17, 2011

statistics
The following data lists the average monthly snowfall for January in 15 cities around the US: 37 33 35 27 9 45 22 8 42 48 37 39 9 15 12 Find the mean, variance, and standard deviation
May 15, 2011

calculus
the derivative of f(x) = e^(sin x)cos(x)
May 4, 2011

calculus
f(x) = e^(sin(x))cos(x)
May 4, 2011

calculus
f(x) = e^(sin(x))cos(x)
May 4, 2011

calculus
i missed something in it sorry. it was ∫sec 2x tan 2x dx
May 4, 2011

calculus
its sec 2x
May 4, 2011

calculus
i dont get what you mean?
May 4, 2011

calculus
∫sec 2x tan x dx
May 4, 2011

freshman chem
if 5.00 g of ethanol is added to 15.0g of whater, what is the % concentration of ethanol in water??
May 4, 2011

chemistry
if 5.00g of ethanol is added to 15.0g of water, what is the % concentration of ethanol in water? THANKYOU
May 4, 2011

English - Macbeth
Think about Macbeth’s position at the conclusion of Act III. In what ways has his ambition, which allowed him to obtain the Scottish throne in the first place, begun to be detrimental to him? Cite specific examples from the play in your response. What does this question ...
April 28, 2011

math
16-4+1 = 13 13 to the 2nd power = 13 *13 13 * 13 = 169
April 27, 2011

English
I just finished reading Macbeth for school. My teacher assigned a essay for us to do. She asked if we think the witches' predictions were right or if the witches' predictions were disappointing because of duality and doublespeak. I said that I believe in neither and I ...
April 27, 2011

math
the answer ie 30
April 26, 2011

Math
$307,$330,$440,$405 (range
April 24, 2011

chemistry
A 1.00-L sample of dry air at 25 °C contains 0.0319 mol N2, 0.00856 mol O2, ... The main components of dry air, by volume, are N2, 78.08%; O2, 20.95%; Ar, ... by volume, of the following main gaseous components: N2, 74.1%; O2, ... What is the partial pressure of each gas ...
April 19, 2011

allied health part 2
I go to a medical high school, so this isn't to unfamiliar, but aren't C and D both medical care operations? I'm leaning towards D....
April 13, 2011

Physiology
The BP cuff constricts arteries and veins, so when the blood pulses to try and get through, that's what you'd hear. (The pounding) If that makes sense....?
April 13, 2011

Chemistry
Calculate the amount of heat required to raise the temperature of a 33 g sample of water from 6 Celsius to 24 Celsius.
April 13, 2011

stereotypes in psychology
Sorry. But who generally fit these based off of beliefs.
April 11, 2011

stereotypes in psychology
are good dancers. drive Hummers. have more fun. are great lovers. cause trouble. are ditzy. are on welfare. live off other people. have hot tempers. are good with money. drink a lot. eat a lot.
April 11, 2011

statistics
Among 17 metal parts produced in a machine shop, 6 are defective. If a random sample of four of these metal parts is selected, find: (a) The probability that this sample will contain at least three defectives. (Do not round the intermediate answers. Round your answer to 4 ...
April 8, 2011

Logarithms
Solve for x: {{{ln(x)+x=5}}}
April 8, 2011

calculus
determine the dimensions of a rectangular solid (with a square base) with maximum volume if it's surface area is 289 meters
April 7, 2011

World history
Try and do your own homework instead of posting the whole worksheet onto here
April 6, 2011

Geometry
Solve for x: 2 to x+1=x+2 to 3 or 2 to x+3= x+2 to x+5 (the proportions end up being the same in the end) I keep getting to the part after you FOIL, and then I get stuck
April 5, 2011

math
Well, when you know how many hours, you multiple that by 2 (for both days he will work), and then the answer to that by his salary of a whopping $750.
April 4, 2011

math
I agree. He surely doesn't work 24 hours a day for 2 days straight with a $750 salary? Come to think of it, I might if I made that much an hour!
April 4, 2011

elapsed time
I'm sorry 10:52 - 2:37 = ____ PM PM not AM :)
April 4, 2011

elapsed time
Subtraction is key! 10:52 - 2:37 = ____ AM? Solve it to find the answer.
April 4, 2011

elapsed time
2:48
April 4, 2011

math
Specify please??
April 4, 2011

English
On most you can say "References provided if needed" Normally size 12 font, it's standard for most.
April 4, 2011

English
It means what might affect you and just you in a big way might have "ripple effects" on everyone else. Like dropping a pebble into water. It affects the immediate space where the pebble landed in a big way (SPLASH), but the whole area around it is still affected, but...
April 4, 2011

Islam in India...Economic effects?
Thank you I have a bit more information now
April 4, 2011

Islam in India...Economic effects?
Thank you! For more specified information, I'm studying it from around 962-12th/13th century Ahhh AP work =[
April 4, 2011

Islam in India...Economic effects?
What economic effects did Islam have in India? I'm having a tough time finding any info for an ESP (Economy, Society, Politics) chart in my book. Any info is welcome and thanked :)
April 4, 2011

Psychology
I quote: "In a 1893 ruling, the U.S. Supreme Court declared that "children under the age of 7 years could not be guilty of felony, or punished for any capital offense, for within that age the child is conclusively presumed incapable of committing a crime." This ...
April 4, 2011

Psychology
These are not my words: "In the US, no. Children 6 yrs old can not be held responsible for their actions. They may be remanded, by the juvenile court to a psychiatric hospital, if they are found to be a threat to themselves or others, up to the age of 18 to 21 yrs old, ...
April 4, 2011

Psychology
In the context of criminal intent -- a 6 year old is considered an infant. Every state has a state penal code section that defines "infant" as it relates to criminal intent and the law. Here's a sample: California Penal Code Section 26 All persons are capable of ...
April 4, 2011

reading
Ahahaha Ms. Sue! Well, she gave you a paragraph. This isn't so hard. Just sit down and open up a dictionary :)
April 4, 2011

Physics helpp please!
A 8000-kg freight car rolls along rails with negligible friction. The car is brought to rest by a combination of two coiled springs as illustrated in the figure below. Both springs are described by Hooke's law and have spring constants with k1 = 1700 N/m and k2 = 3700 N/m...
April 3, 2011

AP Chemistry
A mixture of aluminum and zinc metal is used in 2 experiments described below: A- A 1.7 gram sample of the mixture is reacted with excess hydrochloric acid and the resulting hydrogen gas is collected over water. The reaction takes place at 750 mm Hg atmospheric pressure and ...
April 3, 2011

AP Chemistry
Okay, thank you so much! You really know your chemistry
April 3, 2011

AP Chemistry
Where does the Al(OH)3 come from and how do you know and how do you tell how much of the 2.70g of ppt is Al(OH)3 or Zn(NH3)4^+2?? Thanks
April 3, 2011

AP Chemistry
Im mainly confused on how you know what amount of aluminum or zinc is in the samples of the mixture
April 3, 2011

AP Chemistry
A mixture of aluminum and zinc metal is used in 2 experiments described below: A- A 1.7 gram sample of the mixture is reacted with excess hydrochloric acid and the resulting hydrogen gas is collected over water. The reaction takes place at 750 mm Hg atmospheric pressure and ...
April 3, 2011

Chemistry
Determine the final concentration of 20ml of 5M NaCl of solutions after 30ml of water has been added.
April 2, 2011

Physics
A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 600 N. As the elevator later stops, the scale reading is 396 N. Assume the magnitude of the acceleration is the same during starting and stopping. A)Determine the wieght of ...
April 1, 2011

english - Contrast Advertising
What are some companies that sell produtcs to the average consumer?
March 29, 2011

english
what does this quote mean "We'll have to tighten the belt a little bit and make due"
March 27, 2011

science
what r some good websites to look up river streams ponds lakes wetlands marsh and swaps plants and animals
March 23, 2011

math
try (20*4)+(20*3)
March 23, 2011

chemistry
will the pH be 11.20
March 22, 2011

chemistry
Can you give the steps for working this?
March 22, 2011

chemistry
a 275mL sample of vapor in equilibrium with 1-propylamine at 25C is removed and dissolved in 0.500L of H20. For 1-propalamine, Kb=3.72*10^-4 and the vapor pressure at 25C is 215 torr. (a)What should be the pH of the aqueous solution? (b) How many mg of NaOH dissolved in 0....
March 22, 2011

essay
What are some suggestion regarding should the driving age be raised to 18?
March 15, 2011

Physics
A certain piece of wire has a resistance of 250 ohms. if the wire is cut in three pieces and the cross sectional area of each piece is halved, what is the resistance of each piece?
March 8, 2011

geometry
Quadrilateral QRST has two pairs of congruent sides, but it is not a parallelogram. What figure is it? What further condition would it have to satisfy to be a parallelogram? A. The figure is a square. To be a parallelogram, it would have to have pairs of opposite congruent ...
March 6, 2011

geometry
Can you prove ABCD is a parallelogram based on the given information? Explain. Given: x = 5, y = 4 Prove: ABCD is a parallelogram. A. The figure is a square. To be a parallelogram, it would have to have pairs of opposite congruent sides, not just congruent sides. B. The figure...
March 6, 2011

calculus
How do I find the x values at which the tangents to the graphs f(x)=2x^2 and g(x)=x^3 have the same slope?
March 5, 2011

Chem- PLZ HELP!
Ok that looks wrong. 100g should be under solution for the mass, 18.02g/mol for the solvent of H2O and 85g/mol for the solute of NaNO3. I have to find mass of solute and solvent and the moles of solute and solvent. Pls help anyone!
March 3, 2011

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