Sunday

February 1, 2015

February 1, 2015

Total # Posts: 1,944

**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*

**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*

**physics**

A 83-kg worker clings to a lightweight rope going over a lightweight, low-friction pulley. The other end of the rope is connected to a 66-kg barrel of bricks. If the worker is initially at rest 16 m above the ground, how fast will he or she be moving when he or she hits the ...
*November 20, 2011*

**Chemistry**

It doesnt let me link stuff :c But its the chemsitry toughhh q And i hope you are not typing the answer while i post this XD (sorry if thats the case) Thanks again
*November 20, 2011*

**Chemistry**

I just wanted to clarify that although Cody did respond to my question, we were still unable to determine the solution. I will post a link to the question in a minute. (i noticed you replied to the other posts a bit ago, but i hope im not being too abrupt. Just verifying :P)
*November 20, 2011*

**physics**

im guessing PE is potential energy eqn is PE=mgh 20N is weight of cat, which is equal to Fg, which really is Fg=mg so simply mgh=20x5=100. The cat's kinetic energy is = .5mv(2) (the two is a superscript, meaning the v is squared) Regardless it's velocity is = to 0 when...
*November 19, 2011*

**Physics**

m1v1=m2v2 You have mass and velocity of car (lets designate that m1 and v1) and mass of ball (lets say thats m2). Solve for v2.
*November 19, 2011*

**Physics**

Its another momentum problem similar to your other post. Since there is only two 'fragments' from the 'explosion' :P you can disregard the angle for the velocity and act like they are horizantal to each other. If you dont want to disregard the angle, then you ...
*November 19, 2011*

**Physics**

Use the eqn: v1'=v1*(m1-m2)/(m1+m2) M2=neutral car, its v2=0 since its at rest. m1=truck, v1=11.5. Then, once you have v1' you can sub it into m1v1+m2v2=m1v1'+m2v2' and find v2'. The first eqn is a special eqn only to be used when v2=0 and the collision is ...
*November 19, 2011*

**physics emergerncyy!**

use the eqn v2'=v1(2*m1/(m1+m2)) This eqn is specially derived fro elastic collisions where v2=0. The speeds should be components; north, south, east, west or up, down, leftm, right etc. Anyways, find the components and then use pythagorean theroem. (once you have v1, you ...
*November 19, 2011*

**chemistry_toughhhh**

No it's balanced. you're allowed to have fractions in teh equation. Uncommon yes, but not impossible. Nice try though :P
*November 19, 2011*

**chemistry_toughhhh**

Initial rate of rxn of H2O2(aq)->H2O+ 1/2 O2(g) is found at 1.7x10(-3)M/s and is constant for 2min. You start with 160ml of 16M H2O2. How many mL of O2 in one minute? (Measured at 273K and 760mmHg). I tried to find the new conc of H2O2 via NewConc= Old conc - kt Then i ...
*November 19, 2011*

**algebra**

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. 35 said they drove alone. 38 rode in a carpool. 33 rode public transportation. 5 used both carpools and public transportation. 4 used both a carpool and sometimes ...
*November 19, 2011*

**Systems Analysis, Design, and Implementation**

May anyone help me on this 1- what are the Disadvantages of Structure Analysis? 2- what are the Disadvantages of Object-Oriented Analysis? Thanks
*November 17, 2011*

**geometry**

Triangle XYZ above is similar to triangle UVW (not shown). If the length of one side of triangle UVW is 60, then what is one possible perimeter of triangle UVW?
*November 15, 2011*

**Chem-BufferQ**

Praise the lord. Thank you, i am forever greatful. Kinda pissed that i had the answer alll along and just thought it was in M, not moles. Otherwise i would have known to divide it. But owells, i can't thank you enough man, you're too good :DDDDDDDDDD
*November 14, 2011*

**Chem-BufferQ**

You have a solution of .5 L of 1.74g of NH3 and 4.15g of (NH4)2SO4. How many ml of 14M HCl is required for a pH of 9.00? I don't know how to go finish this one. I thought about figuring the concentrations of each (NH3, NH4), making an ice table and solving for the ...
*November 14, 2011*

**chemistry-Buffer Q**

You have a solution of .5 L of 1.74g of NH3 and 4.15g of (NH4)2SO4. How many ml of 14M HCl is required for a pH of 9.00? I don't know how to go finish this one. I thought about figuring the concentrations of each (NH3, NH4), making an ice table and solving for the additino...
*November 14, 2011*

**astronomy **

At an average opposition, the Earth and Mars are separated by 0.52 AU. Suppose an astronomer observes Mars at opposition and that seeing blurs the images to a resolution of 1.0 seconds of arc. What is the smallest surface feature the astronomer would be able to resolve on Mars...
*November 14, 2011*

**english**

danke schoen
*November 14, 2011*

**english**

Are the following sentences fragments, run-on or complete sentences? 1.You better believe what I say to be true. 2.Listen carefully to what the teacher has to say. 3. I have always wanted to live in England, but I am afraid I will only get to visit at this point in time.
*November 14, 2011*

**Chemistry**

which contains the lowest % of hydrogen? HCl H3PO4 H2SO4 H20 is it HCL?
*November 13, 2011*

**Chemistry**

A sample of C3H8O that contains 200. molecules contains ________ carbon atoms.
*November 13, 2011*

**Chemistry**

True or false? 1 mole of ozone has 1.8 x 10^24 atoms? correct if wrong THANK YOU!
*November 13, 2011*

**Geometry**

If 3 us an element of A and 3 is not an element of B, then which of the following is NOT true 3 is an element of B complement 3 is an element of A union B 3 is an element of A intersect B
*November 13, 2011*

**Chemistry-Common ions**

Wow im an idiot XD thanks. And i dont want to be a nuisance, but how would i do the next question? 0.320M (NH4)2SO4 and 0.492M NH3 (Still looking for OH- conc) Would i find the H+ concentration from the double dissociation of the NH4compound? (i know how to find the oh from ...
*November 13, 2011*

**Chemistry-Common ions**

Woooo! the easy way was correct c: Thanks man. But i still kinda don't know why you just doubled it. I thought it would havesomething to do witht he ice table and such since it was in the common ion+buffer chapter :s Care explaining or?
*November 13, 2011*

**Chemistry-Common ions**

c=Calculate the OH- conc in a solution containing 6.2x10(-3)M Ba(OH)2 and 1.00x10(-2)M BaCl2? I thought of using the BaCl2 conc to find the conc of Ba initially, then use that in the ice table for Ba(OH)2, and solve for OH. But i dnot think that's right. Help? :/
*November 13, 2011*

**Chemistry**

Predict whether the following reactions will be exothermic or endothermic A.] N2 (g) + 3H2 (g) --> 2NH3 (g) B.] S (g) + O2 (g) --> SO2 (g) C.] 2 H2O (g) --> 2 H2 (g) + O2 (g) D.] 2 F (g) --> F2 (g) Bond ________ ∆H˚ (kJ/mol) H-H _________ 432 N(triple)N ...
*November 9, 2011*

**Precal**

.Pump Jack Problem: An oil well pump jack is shown in Figure 3-9f. As the motor turns, the walking beam rocks back and forth, pulling the rod out of the well and letting it go back into the well. The connection between the rod and the walking beam is a steel cable that wraps ...
*November 8, 2011*

**Chemistry**

Calculate the mass ( in grams) of one mole of methane molecules (to .01 g)
*November 1, 2011*

**English**

I think intact is better but i'm not sure. Either one sounds just as rght to me.
*October 31, 2011*

**English**

The accident occurred on a/an ______ road A. intact B. enlisted C. isolated D. forging I know what all the words mean I just don't know which one is best. I thing it is wither isolated or intact. Help would be immensely appreciated.
*October 31, 2011*

**Probability**

Reformatted so that it's easier to read. I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year...
*October 30, 2011*

**Mathematics (Probability, Statistics, etc.)**

I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year lapse in education, so my skills are really ...
*October 30, 2011*

**Physics**

a) Density of H2O = 1E^3 = 1000kg/m^3 Pair = 101.3 = 101300 Pa Pwater = (Density of H2O)*Depth*gravity Ptotal = Pair + Pwater b) diameter = 33.1cm r = 1/2 diameter Area = pi*r^2 Force = Ptotal * Area
*October 27, 2011*

**Math**

When log s (as ordinate) is plotted against t (as abscissa) on linear paper, the graph is a straight line with slope of -2.1 and intercept of 1.5. Express the relationship between s and t as s = Aekt . If s represents a distance in meters and t a time in seconds, what are the ...
*October 25, 2011*

**Math**

Rewrite y = 5(10^(−3x)) in the form y = Ae^(mx). (i.e., determine A and m)
*October 25, 2011*

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