Friday

April 25, 2014

April 25, 2014

Total # Posts: 2,656

**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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