Saturday
April 19, 2014

Posts by ashley


Total # Posts: 2,655

math
a helicopter blade spins 775 times in 3 minutes. find the rate of the revolutions per second.

Chemistry
How much heat energy, in kilojoules, is required to convert 36.0g of ice at 18.0C to water at 25.0C

Physics
Thanks!! Clears up everything

Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...

Math
Two roads intersect at right angles. A water spring is located 65 m from one road and 55 m from the other road. A straight path is to be laid out to pass the spring from one road to the other. Find the least area that can be bounded by the roads and the path. area in m2 = can ...

Math
ok.... so is next step take the first derv of the area Area of rect '= -1/2(4-b^2) + (4-2^2)^1/2

Math
Would it be safe to say that the the diagonal line in the rectangle could equal r = 2. so I could use b^2+ h^2 =r^2 solve for h h= Square root ( r^2 -b^2) Area = b^2 * Square root (r^2-b^2) area = b*(r^2-b^2)^1/2 ....... ????

Math
A mechanical engineering student wishes to inscribe a rectangle in a quarter circle of radius 2.00 cm. Determine the dimensions of the rectangle that will give it the greatest area. length in cm = height in cm = My attempt on find the relationship between the rectangle and the...

Math
Thanks Steve.

Math
The voltage in a circuit is given by the formula V = 16t3 - 79t. Find the values for t for which V is a maximum or a minimum. larger t in seconds = smaller t in seconds = My Answer: V=16t^3-79t V'=48t^2-79 0=48t^2-79 Sq root of 1.645833 = t 1.2829= t V''=96t positi...

Math Max min problems
Ok.... great. thank you Steve. I know understand!

Math Max min problems
ok. I understand that you took the value and plugged in for i. But can I ask why...

Math Max min problems
The power P delivered to a load by a current of i amperes through a resistance of 19 ohms, when 110 volts are supplied at one end of the line, is given by the formula P = 110i - 19i2 . Determine the maximum power that can be delivered. maximum power in watts = My Answer: My an...

Math
Oh, sorry I didn't realise that I needed to provide my answer. I just want to check to see if I obtain the correct answer. My answer is: P=110i-19i^2 P'=110-38i 0=110-38i i=2.8947 P"=-38 therefore a max Max Power in watts = 2.8947

Math
The power P delivered to a load by a current of i amperes through a resistance of 19 ohms, when 110 volts are supplied at one end of the line, is given by the formula P = 110i - 19i2 . Determine the maximum power that can be delivered. maximum power in watts =

PHYSICS
Ms. Anderson shoots an arrow straight up into the air. The arrow leaves her bow at 1.2[m] above ground, and reaches a height of 95 feet above ground. It then falls down and penetrates 14 inches into the ground. Find: a) The velocity of the arrow just before reaching the ground...

Physics!
Ms. Anderson shoots an arrow straight up into the air. The arrow leaves her bow at 1.2[m] above ground, and reaches a height of 95 feet above ground. It then falls down and penetrates 14 inches into the ground. Find: a) The velocity of the arrow just before reaching the ground...

Physics
Mr. Anderson shoots an arrow straight up into the air. The arrow leaves her bow at 1.2[m] above ground, and reaches a height of 95 feet above ground. It then falls down and penetrates 14 inches into the ground. Find: a) The velocity of the arrow just before reaching the ground...

Calculus
I'm not sure what to substitute in this question. Evaluate the integral Square root (tan^-1(x)) / (x^2+1)

Physics
A string on a guitar is supposed to vibrate at 300 Hz, but is measured at 305 Hz. By what percent should the tension in the string be adjusted to correct the tuning?

Physics
A 7.94 nC charge is located 1.75 m from a 4.18 nC point charge. Find the magnitude of the electrostatic force that one charge exerts on the other.

math
a plane flies at 430mph the bearing from Paris to Moscow is 78drgrees and the distance is 1800 mi if the wind is blowing 65mph at 340degrees what heading will take you from Paris to Moscow and how long will it take? include drawing and trip back

math
a boat travels at 16 knots 1st leg: 6hr @ S63W 2nd leg: 4hr @ N10E find time and bearing back to port

math
list a set of at least 12 numbers that has a minium of 28 maximum of 34 median of 30 mode of 29

Calculus 2
I'm confused on how to solve or set up a substitute for the problem. Evaluate the Integral from 1/4 to 1. 1/ sqrt(16t^2 -1) dt

English
10. How does Algernon find out where Jack’s house in the country is located? He eavesdrops on Jack.--Is this correct? He has Lane find out. He steals Jack’s mail. Jack tells him. 11. What is Bunburying? Making up a fake identity to avoid debt collectors. Making up a ...

Chem
If a 930cm3 piston compresses the air in the cylinder to 1/8 its total volume, what is the pressure after the gas is compressed?

Math
What is the unit rate of 8mi and 5h

Math
What is the unit rate of 8mi and 5h

Trig!
a) The annual inflation rate is 3.5% per year. If a movie ticket costs $7.50, find a formula for p, the price of the tickets t years from today, assuming that movie tickets keep up with inflation. b) According to your formula, how much will movie tickets cost in 20 years?

math
I need help figuring out the formula for this problem. What might the lengths of a horse enclosure border be if the enclosure is 52 square feet? I have to show my work. Please can someone help me figure it out?

physics
You are driving a car 33 down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 23.5 meters (Assume positive x to be in the forward direction) Wh...

Physics THRUST
To begin I just need to know how to do thrust. A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not c...

physics
A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions....

physics
A lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m/s to 0.5 m/s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions....

lit
What I wanted to do was to finish my work.

FIN 370
How are an operating budget and a cash budget linked?

FIN 370
What actions might an underperforming organization take to reach and exceed the breakeven point?

Math
$435.58 if you are looking for future value...

math (algerba 1)
Is 2x2 + 16x + 32 a tri square?

math (algerba 1)
2x2 + 16x + 32 how do I Factor and label? And how do I know if this is a tri square?

5th grade math
Hannah, For the first problem with the first mixed number, you would multiply 11 and 15 and add 13. So it would be 178/15 because you still use the demominator. Then you mulitply 3 and 12 and add 7. So that would be 43/12. So the question is 178/15 + 43/12= Can you solve it fr...

FIN 370
thanks!

FIN 370
What is the future value of $1000 in an account for 9 years compounded bi monthly at 14%

english
I am trying to an article on Academics. What is an easy why to explain what it means that is understanding?

Writing
How do I start a story on my self?

Please help
Thanks

Please help
A motorboat can travel upsteam on a river at 18km/h and downsteam at 30km/h. How far upstream can the boat travel if it leaves at 8:00am and must return by noon?

math (algerba 1)
A motorboat can travel upsteam on a river at 18km/h and downsteam at 30km/h. How far upstream can the boat travel if it leaves at 8:00am and must return by noon?

4th grade math
How do you explain how the product of 16 times 34 is like the product of 6 times 34 plus 10 times 34

math
Simran Gill speed walks around the school playground every evening. The playground is 80m long and 45m wide. a.) What is the perimater of the playground? b.) Suppose Simran took a longer walk. Suggest some ways he could do that.

3rd grade math
peanut butter

Math 12th grade
cucumbeer

Cultural Anthropology 101
7 is C/tropical forests

history
To what extent is the following statement accuate? "During the 1960s, the United Sates had become a more open, more tolernt, freer country."

chemistry
How many grams of water can be formed from 10 grams of oxygen?

Writing
I have to write a 5 page essay on the theme of Knowledge in the book Frankenstein...like how pursuing knowledge can be dangerous and Ignorance is bliss. For this essay we either have to defend or challenge the quote "For in much wisdom there is much sorrow and he who stor...

English
Englishpage with a dot com at the end

language
yeaaah buddddy

chemistry
determining the concentration of a strong acid HCl when your given that the volume is 10ml and the mass of NaOH is 0.10 and the volume is 13.45

Algebra 2 Modulus
what would the modulus be for -6+ 4i and write it in simplified radical form?

Algebra 2
Solve the equation x-1= square root 3x+15

Chemistry 2
How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NICl2 for 60.0 minutes. Show all work. Please help!

Chemistry
In order for a cell potential to be a standard cell potential, the concentration of all ions in solution must be ________ M, the partial pressures of all gaseous species must be _______ atm, and the temperature must be ________ K. I need help with the blanks.

Chemistry
In order for a cell potential to be a standard cell potential, the concentration of all ions in solution must be ________ M, the partial pressures of all gaseous species must be _______ atm, and the temperature must be ________ K. I need help with the blanks.

chemistry
for the reaction 3C2H2=> C6H6 at 25 C, the standard enthalpy change is -631 KJ and the standard entropy change is -430 J/K. calculate the standard free energy change at 25 C. show all work!

chemistry
what is the most soluble salt of the following set? a) AgCN with Ksp=6.0 x 10^-17 b) Al(OH)3 with Ksp = 1.9x10^-33 c) Fe(OH)3 with Ksp = 2.6 x 10^-39 d) Sn(OH)2 with Ksp = 1.6 x 10^-19

Chemistry
What is the molarity of a solution prepared by diluting 25.0 mL of 0.412 M magnesium nitrate to a volume of 1.50 L please help!

physics
A 25 g bullet is fired from a gun into a 1.35 kg block of wood initially at rest. (The bullet sticks in the wood). The wood is driven 9.5 m across a horizontal surface with coefficient of friciton 0.25. Find the speed of the bullet just before impact.

physics
A 2.5m long pole is balanced vertically on it's tip. If it falls over with it's bottom never slipping. Find the speed of the top end of the pole just before it hits the ground.

physics
a uniform ladder of mass m and length l leans against fricitonless wall angle theta. If the coefficient of static friction between the ladder and the ground is u, find the formula for the minimun angle such that the ladder won't slip

physics
A star the size of the sun has a mass 8 times as great. It rotates on its axis once every 12 days. It then collapses into a neutron star of radius 10km, losing three quarters of its mass in the process. How long does it take to rotate once after collapse? (it's spere thoug...

History
How did the compromises made when writing and ratifying the Constitution encourage the development of political factions? Compare and Contrast the effectiveness of Washington’s and Adams’ presidencies in obeying and promoting the Constitution during their administrat...

algebra 2
Evaluate (7+3i) - (-2 -5i)

Linear equation
Graph each equation by making a table. Y = 4

Linear equation
Graph each equation by making a table. Y = 4

AAlgebra 1
Graph each equation by making a table. Y = 4

Physics
What is the equivalent resistance of two resistors of 2 ohm and 3 ohm connected in parallel?

Math
i think its 5

Calculus
use mean value theorem: f(x)= 7- 2^x, [0,4], c=?

Calculus
Evaluate the definite integral of the transcendental function. the integral from 0 to 5 of (2^x +8)dx. I got 40+ 31/log(2)but that's wrong.

statistics
the average student sends about 200 text messages a day with the standard deviation of 25 texts.(show graph) a.what is the probability that a student sends more than 250 messsages a day? b.what is the probability that student sends less than 150 text messages a day? c.what is ...

statistics
The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes.(show graph) B. what is the probabilty that a diver stays under for the less than 53 minutes? c.what is the probabilty that a diver stays under between 25 and 50? d. what is the ...

statistics
The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes.(show graph) B. what is the probabilty that a diver stays under for the less than 53 minutes? c.what is the probabilty that a diver stays under between 25 and 50? d. what is the ...

statistics
The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes.(show graph) B. what is the probabilty that a diver stays under for the less than 53 minutes? c.what is the probabilty that a diver stays under between 25 and 50? d. what is the ...

statistics
The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes, what is the probability that a diver stays under for more than 36 minutes

geometry
can a triangle have sides with the given lengths 4in. 4in. 4in.

math
Alicia went on a steamboat ride up the Mississippi River. The boat travels 20 miles per hour in still water. How long will it take her to travel 144 miles upstream if the current of the river is 8 miles per hour?

chamistry
calculate the pH pOH and (OH(aq)) of 0.006mol/l HI(aq)

chemistry
To clean a clogged drain, 26g of sodium hydroxide is added to water to make 150ml of solution. What are the pH and pOH values for the solution?

trig
It is 4.7km from Lighthouse A to Port B. The bearing of the port from the lighthouse is N73E. A ship has sailed due west from the port and its bearing from the lighthouse is N31E. How far has the ship sailed from the port?

7th grade science
in case you have not figured out the answer yet the answer is D.The bottom layer of the sedimentary rock.

physics
A 80kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. He catches the .43kg ball at the peak of his jump, when he is 17.2 inches off the ground. He hits the ground 1.61 inches away from where he leapt. If the ball was moving horizo...

math
If exactly 198 people sign up for a charter flight, Leisure World Travel Agency charges $308/person. However, if more than 198 people sign up for the flight (assume this is the case), then each fare is reduced by $1 for each additional person. Hint: Let x denote the number of ...

grammar
Is at an article adjective in the sentence, Call me at my office

Math
I thought is was written incorrectly on the worksheet; however, I just needed validation, thank you.

Math
My number is greater than 10 but less than 70. The number has 2 in the tens place. The number is 10 less than 45. What is my number?

Statistics
The average amount of time people spend on facebook each day is 71 minutes, with a standard deviation of 4.7 minutes. Are you more likely to select a random person that spends less than 68 minutes per day, or a group of 35 people that spend on average less than 65 minutes per ...

physics
a ball rolls off a 1.7m high desk and lands 1.35m away from the desk. how fast was it rolling?

trig
analyze given equation for following characteristics. (amplitude period, phrase shift) y= 3sin (2x-(3.14/2))

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