Thursday

February 23, 2017
Total # Posts: 1,079

**physics**

a projectile is fired from the top of a building with an initial velocity straight upward at 40m/sec. the top of the building is 50 meters above the ground? a) the maximun height of the projectile above the building b) the time for the projectile to reach the top c) the ...

*October 15, 2011*

**calculus**

Find an equation of the tangent line to the curve at y = cosx - sinx (pi, -1) I found y'= -sinx - cosx and used the equation of the tangent y = mx +b I input the values and get -1 - [(-sinx - cosx) * pi] = b the answer says it is y = x - 1 - pi I have no idea how the ...

*October 14, 2011*

**Physics**

A Federation starship (2500000 kg) uses its tractor beam to pull a shuttlecraft (10000) aboard from a distance of 7 km away. The tractor beam exerts a constant force of 25000 N on the shuttlecraft. Both spacecraft are initially at rest. How far does the starship move (in m) as...

*October 11, 2011*

**calculus**

I am trying to find equation of the tangent line to the curve 2/(1-3x) at x=0 using the definition. I applied it into the formula lim h->0 [f(a+h) - f(a)]/h which gave me [2/(1-3x+h) - 2/(1-3x)]/h I took the conjugate and came with [4/(1-3x+h)^2 - 4/(1-3x)^2] / h(2/(1-3x+h...

*October 1, 2011*

**calculus**

Thanks a lot!

*October 1, 2011*

**calculus**

sqrt(x^2 - 9) / x I need to solve this using the definition of a derivative [f(a+h) - f(a)]/h I can't seem to get it :\

*October 1, 2011*

**Trig**

8.2,171.8 degrees

*September 30, 2011*

**diffirential calculus**

two points are moving horizontally in space at different heights above the earth. show that the angle of elevation of the line joining them is greater when the distance between them is least.

*September 25, 2011*

**math**

use your calculator.show 14. broken keyr is 1. show 2 ways

*September 21, 2011*

**physics**

If a 2000 pound train tilts of a 20 foot cliff at a 135 angle how long will it take to reach the ground?

*September 21, 2011*

**Math**

calculate lim┬(√(x^2+y^2)→∞)〖(sin(x^2 y^2))/(2x^2+3y^2 )〗

*September 19, 2011*

**physics**

Good study tips for physics? I am having trouble understanding the theory and how to apply it into the equations. People have told me I should not just punch in numbers, but I do not know what to do besides that; I treat it like math.

*September 18, 2011*

**calculus**

Why is it that when Lim x -> 0^- the |x| = -x?

*September 18, 2011*

**Math**

(actually sorry, it's 17+44, I made a mistake. That is equal to 61)

*September 13, 2011*

**Math**

Easy. Ok "Half the boys said....yes" which means half said no. 17 said no so that means 17 out of 34 boys know to swim. Now for the girls, we know there are 34 boys so that leaves 66 girls total. 66 multiplied by 2/3 is 44. (44 girls said yes.) 44+34= 78. Therefore ...

*September 13, 2011*

**Math grade 9ish**

Evan is 1.8 metres tall. He walks between two lampposts that are 5 metres apart and notices his shadow from one of the lampposts just touches the base of the other. He also notices that the ratio of his height to the height of the lamppost is 2 to 5. How far is he from each ...

*September 13, 2011*

**ENG125**

Well, poetry can have different topics. Most people think poems HAVE to rhyme. Sometimes, they don't. Here is an example of a rhyming poem:Roses are red,Violets are blue,I know how to rhyme,And so do.

*September 1, 2011*

**Chemistry**

The Percent is 5.9X10^-12 [V(nucleus)/V(atom)]x100% = answer

*August 31, 2011*

**health care management**

Networks and alliances are marriages of money and convenience. Systems are marriages of commitment and values. Develop arguments and counterargements for each statement.

*August 27, 2011*

**Finance**

Supposed you owned a portfolio consisting of $25,000 of US government bonds with a maturity of 30 years. Would your portfolio be riskless?

*August 21, 2011*

**Algebra**

2. The Sugar Sweet Company is going to transport its sugar to market. It will cost $4200 to rent trucks, and it will cost an additional $150 for each ton of sugar transported. Let C represent the total cost (in dollars), and Let S represent the amount of sugar (in tons) ...

*August 18, 2011*

**shortest route**

from immediate predec duration a 2 b 5 c a 3 d b 6 e a,b 4.00

*August 4, 2011*

**Biology**

The article is presented by HomeworkEasy experts out of five years of stead fast dedication to help students with their biology assignments, homework and projects. Origins of biology as a field are expounded and the academic possibilities are briefed. The spicy narration oh ...

*July 11, 2011*

**Math**

How many positive 3-digit integers contain only odd digits?

*July 10, 2011*

**physics**

given that the radius of the earth is 6.37×10^3km and the period of revolution of the moon round the earth is 27.3 days, calculate the average distance from the earth to the moon.

*July 5, 2011*

**pre algebra**

thank you

*July 5, 2011*

**pre algebra**

23/50 of 50 2/3 show steps please

*July 5, 2011*

**chemistry**

How would I calculate the molarity of the resulting solution if 25.0mL of 1.50 M HCL solution is diluted to 500 mL. I know you have to change the milliliters to liters by dividing by 1000 and I know that M= Moles of Solute/Liters of Solute but after that I'm lost. Please ...

*July 1, 2011*

**Math**

How many liters of water should be added to 20 liters of 40% solution of acid to obtain 30% solution?

*June 27, 2011*

**Finance**

The essentiality of finance in the practical world and its applicable evolution is discussed in detail. Accompanying fields such as accounting, economics, audit etc; are discussed in brief. The article throws light on the allied practices of financial management and possible ...

*June 24, 2011*

**english**

1.Type the appositive(s) in each sentence. You do not need to include the commas. Sam, our cat, is too lazy to catch mice. 2. Type the appositive(s) in each sentence. You do not need to include the commas. Our cat Sam is too lazy to catch mice 3. Type the appositive(s) in each...

*June 22, 2011*

**english**

Locate the adverb phrase and the adjective, verb, verb phrase, or other adverb modified. We stopped near a mountain stream.

*June 22, 2011*

**math**

Two circles with radii 3cm and r cm touch each other externally. If their common tangent is 8cm long,what is the value of r?

*June 15, 2011*

**Chemistry**

the equation of the line for a graph of voltage versus log[Cu2+] was y= - 0.0179x - 0.0015. The voltage of a solution with an unknown [Cu2+] was measured against the same reference cell, under the same conditions; the voltage was found to be 0.012 V. Determine the [ Cu2+] of ...

*June 14, 2011*

**Marketing**

How do we incorporate social and cultural forces in marketing systems?

*June 10, 2011*

**english**

Identify the complete adjective clause and the word it modifies. Many Californians who own homes live on hillsides.

*June 9, 2011*

**english**

Identify the complete adjective clause and the word it modifies. This course deals with facts that everyone should know.

*June 9, 2011*

**english**

Identify the complete adjective clause and the omitted introductory word. Is he the man you saw at the coffee shop?

*June 9, 2011*

**english**

Identify the complete adjective clause and the omitted introductory word. The car I drive has 50,000 miles on the odometer.

*June 9, 2011*

**English**

Identify the complete adjective clause and the word it modifies. I elected to take astronomy, which is not a required course.

*June 9, 2011*

**Physic**

what is the focal length of a plane mirrior which is 4m tall?

*June 9, 2011*

**Social Studies**

What is agricultural transition?

*June 5, 2011*

**runways**

IF THE LENGTH OF THE RUNWAY IS 6 INCHES, WHAT IS THE PERIMETER?

*June 3, 2011*

**math**

if m+2/5=1/2If , then which of the following is true? 2m + 4 = 5 m + 2 = 2 2m + 2 = 5 m + 4 = 6

*May 31, 2011*

**English**

As the headboy of your school write a speech on the send forth party of the principal of your school.

*May 23, 2011*

**Trig**

cos4x*cos3x + sin4x*sin3x

*May 22, 2011*

**math**

solve 3x - 5 + x = 31.

*May 20, 2011*

**math**

Emily and Miranda are standing outside. Emily is 5 feet tall and casts a shadow of 28 inches. Miranda's shadow is 29.4 inches long. Approximately how tall is Miranda?

*May 19, 2011*

**math**

A tree casts a shadow of 28 feet. At the same time, a biologist who is 7 feet tall casts a shadow of 2 feet. How tall is the tree?

*May 19, 2011*

**math**

A double recipe of cookies calls for 5 cups of flour. Which of the following proportions could be used to find the amount of flour for a triple recipe? 5/2= f/3 2/5=f/3 2/3 = f/5 3/2=5/f

*May 19, 2011*

**math**

Which of the following is the equation of a direct variation that has a constant of variation equal to -? y = x - -y = x y = -2x y = -x

*May 19, 2011*

**math**

Which of the following sets of ordered pairs is not a direct variation? (0, 0); (-2, 4); (3, -6) (1, 1); (-2, -2); (3, 3) (10, 2); (15, 3); (20, 4) (0, 0); (1,

*May 19, 2011*

**physics**

If the initial velocity of the car in the previous problem (the car accelerates at 5.00 km/hr/s for 3.50 sec) is 22.6 km/hr, what is the final velocity of the car?

*May 18, 2011*

**Physics**

A car experiences an average acceleration of 5.00 km/hr/s for 3.50 sec. What is the change in velocity of the car?

*May 18, 2011*

**Physics**

An ostrich runs north in a straight line for 21 meters. She then turns around and runs 25 meters back toward her nest (south) on the same path. What is her displacement?

*May 18, 2011*

**physics**

A man weighs 645 N on Earth. What is his mass?

*May 18, 2011*

**Math**

Please simplify this expression: 8b + 9 + 4b - 3b + (-2b) - (-5)

*May 11, 2011*

**finance**

Initial spot exchange rate (¥/$) 110.60 Initial price of a Nissan Xterra (¥) 2,800,000 Expected US dollar inflation rate for the coming year 2.000% Expected Japanese yen inflation rate for the coming year 0.000% Desired rate of pass through by Nissan 70.000% a. What ...

*May 5, 2011*

**grammar**

Thank you for your previous answer. There were so many questions that I missed it. I hope that you will help me in the future.

*May 4, 2011*

**grammar**

How do you write 1234.567 in English word form?

*May 4, 2011*

**Economics 210**

Information given is sample mean of 12 for a sample of 26. Sample deviation is 3. Using a .02 level of significance. H0 u< or equal to 10 and H1 u> 10 a. Is this a one or two tailed test? b. what is the decision rule? c. what is the value of the test statistic? d.what is...

*May 3, 2011*

**grammar**

I have to write 1234.567 in English word form. How do I write this number?

*May 3, 2011*

**taylor ranch**

38-47-15-36-91-25-14-17-65

*April 30, 2011*

**Physics**

Oh wait never mind. Seems like there's some rounding issues going on with the online system. Thanks for the help drwls.

*April 26, 2011*

**Physics**

That didn't work. I think you're supposed to find work in each case but I'm not sure how to do that.

*April 26, 2011*

**Physics**

Some Carnot engine has an efficiency 0.700. The hot reservoir temperature is 900K. This means that the temperature of the cold reservoir is 270K. If the cold reservoir is dropped to 260K, the new efficiency is 0.701. If the output of the power is kept constant by increasing ...

*April 26, 2011*

**Grammar**

Where do we put the "and" when writing a number, 1234.567 for example, in words? Some references say, "one thousand two hundred and thirty-four point five six seven. Other references say, "one thousand two hundred thirty-four and five hundred fifty-six ...

*April 23, 2011*

**Physics**

Some cooking pan whose bottom is made out of copper has a radius 0.1 m and thickness 0.003 m. The water in the pan boils at 1.7e-3 kg/s. How much higher is temperature of the outside surface of the pan's bottom compared to the inside surface?

*April 22, 2011*

**statistics**

suppose you are testing Ho:p=.65 versus Ha: p<.65 . for a random sample of 100 people, x=58, where x denotes the number in the sample that have the characteristic of interest . use a .01 level of significance to test this hypothesis.

*April 20, 2011*

**statistics**

Use the data given to test the following hupotheses. Assume the data are normally distributed in the population. Ho: M=7.48 Ha:m>7.48 xbar = 6.91, n=24, sigma=1.21,alpha=.01

*April 19, 2011*

**statistics**

a study by Hewitt Associates showed that 79% of companies offer employees flexible scheduling. suppose a researcher believes that in accounting firms this figure is lower. The researcher randomly selected 415 accounting firms and through interviews determines that 303 of these...

*April 19, 2011*

**IT 240**

2. You are the network administrator for a company that has a peer-to-peer network. How would the pieces and components of this network relate to each other? Define all of the components of this type of network.

*April 17, 2011*

**calculuc**

A rectangular box without a lid is to be made from 12 square meters cardboard. Find the maximum volume of such a box.

*April 17, 2011*

**math**

A rectangle is 3 times as long as it is wide, it's area is 108 square centimeters. What is the length? what is the width?

*April 5, 2011*

**Physics**

Find the speed at which Superman (mass=88.0 kg) must fly into a train (mass = 17998 kg) traveling at 60.0 km/hr to stop it. Running into the train at that speed would severely damage both train and passengers. Calculate the minimum time Superman must take to stop the train, if...

*March 27, 2011*

**algebra**

multiply and simplify by factoring sqrt20a^11b*sqrt8a^12b^11

*March 24, 2011*

**algebra**

multiply and simplify by factoring sqrt20a^11b*sqrt8a^12b^11

*March 24, 2011*

**algebra 1-B**

solve (sqrt14-x)+8=(sqrt3-x)=11

*March 24, 2011*

**physics**

2Tcos16.9=W, but W=mg=54x9.8=529.2N, T=W/2c0s16.9 T on each cord is to be 276.54N

*March 22, 2011*

**MGT330**

General environment – how will the forces be changing over the next three years and how will these forces impact the industry (for example, demographics – aging population)?

*March 14, 2011*

**chemistry**

26.5 moles of a .2 M aqueous solution of NaOH is required to titrate 50 ml of an aqueous solution of HNO3, what is the concentration of HNO3. I don't want the answer, I want to know how to do it.

*March 14, 2011*

**chemistry**

26.5 moles of a .2 M aqueous solution of NaOH is required to titrate 50 ml of an aqueous solution of HNO3, what is the concentration of HNO3. I don't want the answer, I want to know how to do it.

*March 14, 2011*

**Physics**

Thanks drwls. I'm having trouble with part b though. What is R? For the appropriate mass, am I suppose to use the density times the thickness to get the mass of the sail and with that, add the mass from payload?

*March 11, 2011*

**Physics**

Some spacecraft design uses a solar sail made of aluminized plastic. As sunlight reflects off the sail, radiation pressure drives the spacecraft outward away from the sun. a. If the sail material has a density of 700.0 kg/m3, what is the maximum thickness of the sail for which...

*March 11, 2011*

**optimization calculus**

Let length be L and width of open end be W. Height is then 144/(LW) Area of netting required A = LW (top) + WH (end) + 2LH (sides) A = LW + 144/L + 288/W Differentiate to find dA/dL and dA/dW and equate both to zero. Solve these as a pair of simultaneous equations. You should ...

*March 8, 2011*

**7th grade math**

You need to show a Venn Diagram for this question

*March 7, 2011*

**7th grade math**

A group of 32 students went to the amusement park.All of them either rode the Ferris wheel or Roller coaster.Seventeen rode the Ferris wheel,23 rode the roller coaster,and 8 did both.How many rode only the Ferris wheel

*March 7, 2011*

**lccc**

An urn contains 4 red and 3 blue marbles. What is the probability when three marbles are selected randomly that all 3 will be red, if we select each marble a) with replacement b) without replacement

*March 3, 2011*

**7th grade math**

Each person has taken four tests and has one more test to take.Find the score that each person must make to change the mean or median as shown Barry has scores of 93,84,86,and75.He wants to raise the mean to 86

*March 2, 2011*

**Math**

24x - 10 = 18x - 4. Please I need operations for this equation

*March 1, 2011*

**math**

integration of cot^4(1-2x)dx

*February 27, 2011*

**math (calculus)**

i don't know what would be the answer

*February 25, 2011*

**math (calculus)**

what would be the answer?

*February 25, 2011*

**math (calculus)**

what would be the answer when you plug 5pi/4 into this equation 6sec^2x-7sinx for x? i cant get the answer need some help

*February 25, 2011*

**MATH(CALCULUS)**

f(x)=12x/(sinx+cosx) find f'(-pie) need some help!

*February 25, 2011*

**last question!!need help!!**

oh ok thanks for that

*February 24, 2011*

**last question!!need help!!**

ok and yes ive tried all thoses answers i put them in to see if its right and they are not i don't know why they are not right cause it has to be cause sinpie=0 and cospie=-1 so leaves with -12pie or -12 but somehow they arent the answer i quess i have to work more into it...

*February 24, 2011*

**last question!!need help!!**

can you help me!!

*February 24, 2011*

**last question!!need help!!**

this is the equation: f(x)=12x/(sinx+cosx) and i need to find: f'(-pie)

*February 24, 2011*