Monday

April 27, 2015

April 27, 2015

Total # Posts: 1,980

**Physics**

The interatomic spacing in a crystal of table salt is 0.281 nm. This crystal is being studied in a neutron diffraction experiment, similar to the one that produced the photograph in the figure. How fast must a neutron (mass = 1.67 x 10^-27 kg) be moving to have a de Broglie ...
*April 22, 2012*

**math**

If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum.
*April 17, 2012*

**geometry**

The area of a regular decagon is 50cm2. What is the area of a regular decagon with sides four times the sides of the smaller decagon?
*April 13, 2012*

**circular motion**

6134
*April 12, 2012*

**math**

2 men ran 36 parts. X ran 5 times as many as Y. how many parts did Y run?
*April 9, 2012*

**History **

Create a Metaphor and simile about the panama canal, the perspective of the untied states from panama canal, and from the perspective of panama canal from the untied states. and give three reason for each.
*April 8, 2012*

**Math**

find the equation of a line that passes through (5,2) and (2, -2)?
*April 7, 2012*

**Physics. PLEASE HELP!!**

You must be in Dr Jordans class as FAU as well
*April 7, 2012*

**alegbra **

Coach Willful believes that the best sixth-grade soccer players are 58 inches tall, and he will accept his ideal as players on his team. why does the equation:|58-h|<4 express the height,h, of coach Willful's team players?
*April 5, 2012*

**Current/Magnetic force**

A high voltage power line carries a current of 110 A at a location where the Earth's magnetic fields has a magnitude of 5.9 x 10^-4 T and points north at an angle of72 degrees below the horizontal (toward the earth surface). Find the direction and magnitude of the magnetic...
*April 5, 2012*

**social studies**

Thanks
*April 3, 2012*

**social studies**

i did my project on the attack on pearl harbor and it says that i have to describe how my project relates to the theme "Revoultion,Reaction and Reform" i have no clue about this question. Please help?
*April 3, 2012*

**social studies**

Why was pearl harbor described as a day of infamy?
*April 3, 2012*

**physics**

a fully loaded saturn V rocket has a mass of 2.9*10 to the power of 6 Kg. Its engine provides a thrust of 3.3*10 to the power of 7N(down). Determine its weight (force due to gravity) as it stands on a launching platform
*April 2, 2012*

**math**

Compute the compound quarterly amount after 1 year for $100 invested at 12% interest compounded quarterly. What simple interest rate will yield the same amount in 2 years?
*April 1, 2012*

**physics**

What pressure does a 155Newton woman exert on the floor when she balances on one of her heels? Her heels have an average radius of 0.0005 m.
*April 1, 2012*

**physics **

Please Help, Two point charges are fixed on the y axis: a negative point charge q1 = -23 µC at y1 = +0.23 m and a positive point charge q2 at y2 = +0.33 m. A third point charge q = +7.8 µC is fixed at the origin. The net electrostatic force exerted on the charge q ...
*March 30, 2012*

**math**

how do you do it though? its hard
*March 28, 2012*

**math**

what problem did the dumb gangster have when the boss told him to blow up a car?
*March 28, 2012*

**APUSH**

Please check? 1. a 2.c 3. e 4. b 1. Before the civil war the south's slave labor force a. was a self reproducing population b. was generally unprofitable to the planter class c. was an inflexible labor system d. was employed exclusively in the cultivation of cotton e. was ...
*March 27, 2012*

**math**

Suppose $15000 is invested in an account for 6 years. Find the balance in the account if interest is compounded continuously at 6%.
*March 22, 2012*

**English**

In the word ecologists, is eco the root morpheme or ology? Are the morphemes eco, log, y, ist, s or ec, ology, ist, s ? This is very confusing for me. Any explanation on how to find the root would be appreciated. It's easy to find roots on some words, but words like ...
*March 18, 2012*

**English**

requirements name the root morpheme:quire # of bound morphemes: 3 list derivational morphemes: re, ment list inflectional morphemes: s Is this correct?
*March 17, 2012*

**calc**

consider the function f(x)=x^3 - x^2 - 3x -2. find the average slope of this function on the interval (-2,3). by the mean value theorem, we know there exists a c in the open interval (-2,3) such that f'(c) is equal to this mean slope. find the two values of c in the ...
*March 16, 2012*

**English**

Is "this" an adjective or determiner if you are doing a syntax tree diagram branching out from a NP? I will surely leave this job without a penny in my pocket. Is "without" a preposition?
*March 16, 2012*

**English**

Is this sentence in past progressive tense? The freshman math classes were already behind schedule by three weeks.
*March 15, 2012*

**Physics**

Calculate the resistance of a 900 watt toaster operating at 120 volts. Which formula do you use?
*March 12, 2012*

**math! help please wont take long**

dont answer i figured it out
*March 6, 2012*

**math! help please wont take long**

find the value of K so that 3x^2-6x+k=0 has a double root answer is 3. how do you find that
*March 6, 2012*

**College Algebra**

Let U = {5, 6, 7, 8, 9, 10, 11, 12, 13, 14}, A = {6, 8, 10, 12}, B = {9, 13}, and C = {6, 9, 12, 13, 14}. List all the members of each of the sets. (a) (A ¿ B) ¿ C , (b) A ¿ B ¾ C
*March 6, 2012*

**English**

important is an adjective; ratings is a noun; reasons is a noun;offers is a verb.
*March 1, 2012*

**English**

Incorrect sentence: The report considers important factors in choosing a medical facility, ratings of services at the urgent care center, reasons why HMO members do not use the center, and offers suggestions for increase in member usage. I know this has parallelism problems. I...
*March 1, 2012*

**English**

I think # 1 is weak and #3 is weak.
*February 29, 2012*

**English**

Are the verbs in these sentences passive voice, weak or past tense. My answers: 1. The book was informative but too long.--weak or past or both?? 2.The teachers have sent the book to the publisher.--past 3.The essay has been shortened by ten pages.-- past 4. This method of ...
*February 29, 2012*

**Math**

Transform the equation or inequality by completing the square. y^2+3x-6y-7=0
*February 27, 2012*

**physics**

At a given instant in time, a 4.2-kg rock is observed to be falling with an acceleration of 8.4 m/s2. To two decimal places, what is the magnitude of the force of air resistance acting upon the rock at this instant?
*February 27, 2012*

**Chemistry**

[H^+] = 2.7 x 10^-3 Calculate for [OH^-] [OH^-] = ? M
*February 26, 2012*

**Algebra**

A club with 35 members is to select five officers (president, vice president, secretary, treasurer, and historian). In how many ways can this be done?
*February 23, 2012*

**math**

number of 5c pieces --- x number of 20c pieces --- 30-x 5x + 20(30-x) = 345 Expand 5x+600−20x=345 Simplify 5x+600−20x to −15x+600 −15x+600=345 Subtract 600 from both sides −15x=345−600 Simplify 345−600 to −255 −15x=−...
*February 23, 2012*

**physics**

a force F pushes on a box of mass m that initially is at rest on a rough, horizontal surface. the force F is directed at an angle theta = 30 degreees above the horizontal. the coefficants of friction between the plane and the box are static= .30 and kinetic = .28. if F=50N and...
*February 17, 2012*

**Math**

Given two spinners one with four equal parts labeled 1,1,3,4. And one with six regions labeled 1,2,3,4,5,6. Given one spin on each spinner what is the probability of spinning two numbers with the sum of 7?
*February 16, 2012*

**algebra**

how many pounds of cashew nuts that sell for 2.00 a pund should be mixed with peanuts, which sell for 80 cents a pound to make a 10 pound mixture that sells for 1.28 a pound
*February 15, 2012*

**algebra**

a lab technician has a 15% alcohol solution. She wants to make 100 gallons of a 29% solution. How much of the 15% solution should she use?
*February 15, 2012*

**phyisics**

A 615 kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed. (a) What is the acceleration of the car?
*February 14, 2012*

**science**

*conclusion
*February 13, 2012*

**science**

i have no idea what to do for my manatee onclusion. Any ideas for what to say?
*February 13, 2012*

**science**

Thanks
*February 13, 2012*

**science**

What does it mean when manatees have natural selection? i have a summary to do about manatees and one of the words i have to use is natural selection. Any help?
*February 13, 2012*

**science**

i still dont get it :/
*February 13, 2012*

**science**

If the manatees were able to make 3 adaptions to their body or way of life for their survival, what would they be? PLEASE no websites :/
*February 13, 2012*

**science**

identify onbe external feature of the manatee that allows it to live in water.
*February 12, 2012*

**Physics**

A test tube in a centrifuge is pivoted so that it swings out horizontally as the machine builds up speed. If the bottom of the tube is 145.0 mm from the central spin axis, and if the machine hits 46500 rev/min, what would be the centripetal force exerted on a giant amoeba of ...
*February 11, 2012*

**MAth Probability**

Determine the probability of each of the following types of poker hands a. Two pairs (two cards of one denomination, two cards of a different denomination, and one card of a denomination other than those two denominations) b. One pair (two cards of one denomination and three ...
*February 9, 2012*

**Math Probability**

A math class has 20 students who choose a topic from a list for an essay. How big pool is necessary for the probability of at least one duplicate to drop below fifty percent? I understand it is like the birthday problem, I just do not understand how to solve it still.
*February 9, 2012*

**Math Probability**

What is the probability that a student applied to THREE OR MORE colleges? with the chart Num. Applied Probability 1 .17 2 or less .29 3 or less .43 4 or less .59 20 or less 1
*February 9, 2012*

**Math **

A math class has 20 students who choose a topic from a list for an essay. How big pool is necessary for the probability of at least one duplicate to drop below fifty percent?
*February 8, 2012*

**intermediate algebra**

The third angle in an isosceles triangle is 1/2 as large as each of the two base angles. Find the measure of each angle.
*February 5, 2012*

**intermediate algebra**

The third angle in an isosceles triangle is 1/2 as large as each of the two base angles. Find the measure of each angle.
*February 5, 2012*

**Physics**

A 6490 kg helicopter accelerates upward at 0.59 m/s2 while lifting a 1180 kg car. (a) What is the lift force exerted by the air on the rotors? N (b) What is the tension in the cable (ignore its mass) that connects the car to the helicopter?
*February 2, 2012*

**chemistry**

thanks
*February 2, 2012*

**chemistry**

how would i set this up? chelste's diet restricts her intake of protein to 24 g per day. if she eats an 8.0 oz burger that is 15.0% protein, has she exceeded her protein limit for the day? How many ounces of a burger would be allowed for chelste?
*February 2, 2012*

**Math: Algebra**

Landon can climb a certain hill at a rate that is 2.5 mph slower than his rate coming down the hill. If it takes him 6 hours to climb the hill and 45 minutes to come down the hill, what is his rate coming down?
*February 1, 2012*

**physics**

If someone kicks a soccer ball across a flat parking lot with an initial velocity of 19.0m/s @ 19 degrees, how long will the soccer ball be in flight and how high above its launch point will the ball go? What would be the x and y components of this velocity at t=0.
*January 31, 2012*

**trig**

Prove (1+secx)/(tanx+sinx)=cscx
*January 31, 2012*

**Trig**

Solve the following trig equation 2cos(x-π/6)=1
*January 31, 2012*

**Trig**

Prove (1+secx)/(tanx+sinx)=cscx
*January 31, 2012*

**Calculus**

Consider the curve -8x^2+5xy+y^3=-149 1. Find Dy/dx 2. write an equation for the line tangent to the curve at the point (4,-1)
*January 30, 2012*

**math**

The day started out at 16 F and ended at 25 F. Find the percent change for the temperature throughout the day?
*January 29, 2012*

**anatomy**

I have tried to search this and I can't find anything on this. Can you please help?? Name the structures that can be seen in the elastic cartilage?
*January 26, 2012*

**chemistry**

how much ice would i have to eat to l lose 10% of my body weight?
*January 22, 2012*

**phyics 2**

Remarks The gravitational force between the charged constituents of the atom is negligible compared with the electric force between them. The electric force is so strong, however, that any net charge on an object quickly attracts nearby opposite charges, neutralizing the ...
*January 19, 2012*

**Economics**

4. Which of the following statements are positive in nature and which are normative? a. A tax cut will raise interest rates. I think it is Normative Economics
*January 17, 2012*

**math**

Jason bought a laser printer that regularly sells for $ 649.99AT THE MARKDOWN RATE OF 35%.What is the final selling price
*January 6, 2012*

**Excel**

The correct answer is A - Styles gallery.
*January 5, 2012*

**math**

what are these words unscrambled: untoegrnc visteiop unrlerpadecpi please help
*January 2, 2012*

**chemistry**

Balance the equation NH3 + O2 −→ N2 + H2O Given 4.55 mol of the reactant NH3, determine the corresponding amount of O2.
*December 19, 2011*

**Physics**

A 145 m long ramp is to be built for a ski jump. If a skier starting from rest at the top is to have a speed no faster than 22 m/s at the bottom, what should be the maximum angle of inclination?
*December 16, 2011*

**Physics**

It takes 0.220 s for a dropped object to pass a window that is 1.14 m tall. From what height above the top of the window was the object released?
*December 16, 2011*

**Biology**

What is the difference between thromboplasin and factor Xa? I have in my notes that they both convert prothrombin to thrombin.
*December 13, 2011*

**Algebra**

Solve: squareroot 2x-1 - squareroot x+3 = 1 please show steps
*December 13, 2011*

**Algebra**

Solve (x-1)^2 = 16 please show steps
*December 13, 2011*

**alg II**

linear functions if g(fx) = 2x+6 f(gx) is a line through origin what is f(g2011)
*December 13, 2011*

**ALGEBRA**

Solve (x-1)^2 = 16 show steps
*December 12, 2011*

**Algebra-HELP**

Solve: squareroot 2x-1 - squareroot x+3 = 1 show steps
*December 12, 2011*

**Physics**

A bathtub of icy water at 32 degrees farenheit holds 17 gallons. You put in a 25 pound watermelon with a temperature of 100 degrees farenheit. If you wrap the tub completely in blankets so it does not lose any heat, what will be the final temperature of the watermelon? (...
*December 11, 2011*

**Physics**

80*1kg?
*December 11, 2011*

**Humanities**

Why does a teacher needs to have a grasp of students social setting and the condition in which they live?
*December 11, 2011*

**accounting**

What is the acid test ratio? Is it the same thing as the quick ratio?
*December 9, 2011*

**Math**

Bond : Face Value = 100,000 State Rate = 9% Semi-annual Payments Term = 3years Market Rate of 12% Amortize the bond to determine: Year 1 Interest Expense End of Year 1 carrying value. My Answers: Year 1 Interest Expense = 5,621.05 End of Year 1 carrying value =94,805.14 Am I ...
*December 7, 2011*

**algebra**

3x-y=25 x+4y=-22 3x-y=25 -3x-12y=66 -13y=91 y=-7 x+4(-7)=-22 x=6
*December 4, 2011*

**Physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. a.) Calculate the speed of a 103-kg ...
*November 30, 2011*

**physics**

A 2.9 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.0 with the horizontal. An average frictional force of 4.2×103 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4.6 m...
*November 29, 2011*

**Math**

Reduce the fraction to simplest form 2x+2/6x^2+16x+10 (the 6x is squared I think thats how you show it)
*November 28, 2011*

**math**

the third and fourth terms of the sequence are 21 and 38. If the second differences are a constant 2, what are the first five terms of the sequence?
*November 22, 2011*

**Chem**

Oh, alright. I'm sorry then. XD
*November 21, 2011*

**Chem**

Why wont you answer my previous q Dr. Bob? D:
*November 21, 2011*

**chemistry-help!**

The initial rate of reaction for H2O2(aq) <-> H2O (l) 1/2 O2 (g) is found to be 1.7x10(-3)M/s. Assume that this rate holds for 2 minutes. Start with 160ml of 1.60 M H2O2. How many milliliters of O2 measured at 24C and 760mmHg , are released from solution in the first ...
*November 21, 2011*

**Chem-Repost**

it wouldn't let me post after putting spaces in the url and everything, so i just copied and pasted the q instead :P sorry for all the messyness. i'll see if i can delete q's, in the mean time you can maybe look at this please? Initial rate of rxn of H2O2(aq)->...
*November 20, 2011*

**Math**

7/8 is about 1, 3 1/4 is about 3, 1+3=4? And follow the same pattern for th rest. That's how i would estimate it :s And an example for division is 9 5/6 is about 10, 2 1/8 is about 2, 10 / 2 = 5. Hopes this helps
*November 20, 2011*

**Chemistry**

Using grammatically correct English sentences describe how the nature of the bonding in MgF2 (s) and Zn(s) differ. (Don't just name the different types of bonding-describe how they are different. Which of the following are metallic? F2(g), Co(s), NaCl(s), H2O(s), C6H6(l) (...
*November 20, 2011*