Saturday

September 20, 2014

September 20, 2014

Total # Posts: 3,162

**Physics**

A die is designed to punch holes of radii 2.17 x 10-2 m in a metal sheet that is 5.53 x 10-3 m thick. To punch through the sheet, the die must exert a shearing stress of 3.5 x 108 Pa. What force must be applied to the die? (Hint: Consider carefully which area is used in your ...
*November 22, 2010*

**Physics**

Between each pair of vertebrae in the spinal column is a cylindrical disc of cartilage. Typically, this disc has a radius of about 2.6 x 10-2 m and a thickness of about 1.4 x 10-3 m. The shear modulus of cartilage is 1.2 x 107 N/m2. Suppose a shearing force of magnitude 18 N ...
*November 22, 2010*

**physics**

what is the variation of pressure in the sound wave if the sound intensity is 3.85x10^-8 W/m^2, the speed of sound is 343 m/s and the density of air is 1.2 kg/m3?
*November 21, 2010*

**Physics**

what is the variation of pressure in the sound wave if the sound intensity is 3.85x10^-8 W/m^2, the speed of sound is 343 m/s and the density of air is 1.2 kg/m3?
*November 21, 2010*

**Physics**

How would I do that?
*November 21, 2010*

**Physics**

A microphone has an area of 3.8 cm2. It receives during a 2.87 s time period a sound energy of 4.2x10-11 J. What is the intensity of the sound?
*November 21, 2010*

**Physics**

A microphone has an area of 3.8 cm2. It receives during a 2.87 s time period a sound energy of 4.2x10-11 J. What is the intensity of the sound?
*November 21, 2010*

**Physics**

The answer seems to be wrong when I submit.
*November 21, 2010*

**algebra word problems**

1) tina has 48 mL of a solution that is 25% acid. how much water should she add to obtain a solution that is 15% acid? 2) how many grams of sugar must be added to 60 grams of a 32% solution to obtain a 50% solution?
*November 21, 2010*

**algebra word problems**

you have 95 coins that total $10.75. the coins consist of only quarters and nickels. how many of each coin do you have?
*November 21, 2010*

**ALgebra word problem**

a coffee shop sells a cup of espresso for $2.00 and a cup of cappuccino for 2.50. on friday, rachel sold 30 more cups of cappuccino than espresso, and she sold $178.50 worth of espresso and cappuccino together. how many cups of each were sold?
*November 20, 2010*

**Economics**

You want to start a company, and are trying to decide between two different industries. You are doing your final research before you write your business plan. Industry A has 20 firms and a Concentration Ratio (CR) of 20% * What is the name for this type of industry? * Describe...
*November 19, 2010*

**grade 12 data management**

Q- 2 cards are drawn without replacement from a deck of 52 cards. What is the probability that the both card are aces given that they are the same color? I am having a hard time with this question. If anyone knows this I would appreciate it very much thanks.
*November 19, 2010*

**geometry**

A rectangular rug covers the floor in a living room. One of the walls in the same living room is pained blue. Are the rug and the blue wall parallel?
*November 18, 2010*

**ALgebra**

multiply 1) (x-3)^3. 2) (2x+y)^3. 3) (3a-2)^3
*November 18, 2010*

**history**

Why would some people find it wrong to have a woman president for to represent their country?
*November 18, 2010*

**ALgebra**

multiply. (x+2)(x-2)(x^2+4)
*November 18, 2010*

**Physics**

A block attached to a spring with unknown spring constant oscillates with a period of 6.0 s. What is the period if the mass is doubled?
*November 17, 2010*

**Interest **

Walter's savings account has a balance of $273. After 5 years, what will the amount of interest be at 5% compounded quarterly?
*November 16, 2010*

**Managerial Economics**

idk
*November 16, 2010*

**Math**

THe total ticket sales for the basketball game were $1,625.00. Adult tickets were $7.00, and student tickets were $3.00. Twice as many students bought tickets as adults. How many student and adult tickets were sold?
*November 15, 2010*

**biopsychology**

Explain to little brother or sister how neours and synapses work
*November 15, 2010*

**11th grade**

What measures does henry say the colonists have already tried in the dealings with england?
*November 15, 2010*

**math**

Evaluate (3 + 4) + 1 in the mod 5 system
*November 14, 2010*

**Physics**

One gram of water changes from liquid to solid at a constant pressure of 1.00 atm and a constant temperature of 0°C. In the process, the volume changes from 1.00 cm3 to 1.14 cm3
*November 14, 2010*

**Physics**

A man of mass 65.2 kg stands on a scaffold supported by a vertical rope at each end. The scaffold has a mass of 22.7 kg and is 2.4 m long. Suppose the man stands to the right from the middle of the scaffold that is a distance one sixth of the length of the scaffold. what is ...
*November 13, 2010*

**Physics**

So i multiply 0.69 by ?? 0.345?
*November 13, 2010*

**Physics**

A square, 0.69 m on a side, is mounted so that it can rotate about an axis that passes through the center of the square. This axis is perpendicular to the plane of the square. A force of 17.1 N lies in this plane and is applied to the square. What is the magnitude of the ...
*November 13, 2010*

**Physics**

How about for the left rope? Would it be the same thing? or negative instead?
*November 13, 2010*

**Physics**

A man of mass 65.2 kg stands on a scaffold supported by a vertical rope at each end. The scaffold has a mass of 22.7 kg and is 2.4 m long. Suppose the man stands to the right from the middle of the scaffold that is a distance one sixth of the length of the scaffold. What is ...
*November 13, 2010*

**Chemistry**

Calculate Delta G for the spontaneous cell produced from the following: Al^3+ + 3e^- -> Al (s) Mg^2+ + 2e^- -> Mg (s) In order to solve this, you need to determine the half reactions..ie which is reduced and which is oxidized. How do I know which one is being reduced and...
*November 11, 2010*

**ALgebra**

simplify (-2x^-4) (8x^-3)
*November 11, 2010*

**ALgebra**

simplify (-2x^3)^2 (3x^-2)
*November 11, 2010*

**ALgebra**

simplify 4z-[23-5(3z-2)]
*November 11, 2010*

**English quick ?**

yes i believe there is
*November 11, 2010*

**Trig**

tan^2t/sect=sect-cost cott^2/csct=csct-sint
*November 11, 2010*

**Physics**

A space vehicle is traveling at 5260 km/h relative to Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 89 km/h relative to the command module. The mass of the motor is four times the mass of the module. What is the speed (in km/h) of the ...
*November 9, 2010*

**history**

what are some of the ways in which modern culture is "fatalistic" (in the ancient Greek sense of the word?
*November 8, 2010*

**ALgebra**

f=m(m/g^2) solve for m
*November 7, 2010*

**ALgebra**

solve 3x-8>2x-1
*November 7, 2010*

**Physics**

A 25 kg child bounces on a pogo stick. The pogo stick has a spring with spring constant 2.0*10^4 N/m. When the child makes a nice big bounce, he finds that at the bottom of the bounce he is accelerating upwards at 9.8 m/s^2. How much is the spring compressed?
*November 6, 2010*

**ALgebra word problem**

monthly credit card interest is charged at a rate of 1.5%. after one month, total purchases plus interest equal $46.69. how much were the purchases?
*November 6, 2010*

**ALgebra**

yes they were two different problems and yes i know they're stupid questions in my math book.
*November 6, 2010*

**ALgebra**

simplify: (2x^2y)(-5x^-5y^6) (5y)^3
*November 6, 2010*

**college**

convert 2(NH4)3PO4+3HgSO4=3(NH4)2SO4+Hg3(PO4)2 into complete ionic equation,then net ionic equation
*November 4, 2010*

**algebra**

can you tell me the process of how to simply problems like this so i dont have to keep asking? simplify: (2x^2y)(-5x^-5y^6) (5y)^3
*November 4, 2010*

**ALgebra**

a swim club requires a $120 membership, plus $4 each swim. How much would a person pay to swim 35 times?
*November 4, 2010*

**math**

whats square root of 16
*November 2, 2010*

**Physics**

i tried both ways and both are wrong :s
*November 1, 2010*

**Physics**

So tan theta = 20.8/3.7?
*November 1, 2010*

**Physics**

What do you mean by convert it to your system?
*November 1, 2010*

**Physics**

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration? What is the direction of the acceleration in degrees? (Take east to be 0 degrees and counterclockwise to ...
*November 1, 2010*

**Physics**

A 2.03 kg mass is observed to accelerate at 8.82 m/s2 in a direction 28.8° north of east. There is a force directed north acting on the object and a force directed east acting on the object. What is the magnitude of the force acting east on the object?
*November 1, 2010*

**ALgebra**

the difference of two numbers is 37. the larger is one more than four times the smaller. what are the numbers?
*November 1, 2010*

**ALgebra**

the sum of two numbers is 87 & their difference is 35. find the numbers.
*November 1, 2010*

**english**

compare and contrasrt natty bumppo in the prarie and john in the Hospital SKetches.
*November 1, 2010*

**ALgebra**

the difference between two numbers is 7. the larger number is 9 less than 3 times the smaller. find the numbers
*October 31, 2010*

**ALgebra**

the difference between two numbers is 7. there sum is 25. find the numbers
*October 31, 2010*

**Physics**

An object's moment of inertia is 1.8 kg\,m^2. Its angular velocity is increasing at the rate of 3.4 rad/s^2. What is the torque on the object?
*October 30, 2010*

**ALgebra**

the difference of two numbers is 7. the larger number is 9 less than 3 times the smaller. find the numbers
*October 30, 2010*

**ALgebra**

that didnt work
*October 30, 2010*

**ALgebra**

the difference of two numbers is 5. three times the smaller number is two more than twice the larger number. find the numbers
*October 30, 2010*

**algebra**

6 burgers and 3 hot dogs cost $27. 5 burgers and one hot dog cost $18.75. what is the price of a hot dog? what is the price of a hamburger?
*October 28, 2010*

**math**

asking missing rule? jai... in, rule, out thanks
*October 28, 2010*

**math**

ok, jai but what is the rule? thanks
*October 28, 2010*

**math**

input 6 10 16 output 3 5 8 2nd grade,what is rule? thanks
*October 27, 2010*

**what is rule?**

input 6 10 16 output3 5 8
*October 27, 2010*

**physic**

Six roller-coaster carts pass over the same semicircular "bump." The mass M of each cart (including passenger) and the normal force n of the track on the cart at the top of each bump are given in the figures. Iam given the force in N of the cart at the peak of the ...
*October 27, 2010*

**Physics**

The space shuttle is in a 200-mile-high orbit. What is the shuttle's orbital period?
*October 27, 2010*

**Physics**

The centers of a 13 kg lead ball and a 130 g lead ball are separated by 5.0 cm. What gravitational force does each exert on the other?
*October 27, 2010*

**science**

7. Assuming that there are no other nonconservative forces involved, what impulse was given to each car during the collision? (6 points) A. Car 1 (3 points)
*October 27, 2010*

**geometry**

ABCD is a quadrilateral with BC perpendicular to AB and DE is perpindicular to AB. If AB is 38 yard and EB equals 18 yards, BC equals 13 yards, and DE equals 15 yards. Find the area of ABCD
*October 27, 2010*

**chemistry**

what volume in Liters of 0.15M KCl solution is required to completely react with 0.150 liter of a 0.175M Pb(NO3)2 solution according to the following balanced equation? 2KCl(aq)+ Pb(NO3)2(aq)-PbCl2(s)+ 2KNO3(aq)
*October 26, 2010*

**physics**

Two race cars are speeding around the racetrack at different speeds. One goes around the track in 2 minutes; the other goes around the track in 1½ minutes. How often does the faster car pass the slower car? Is there a formula to figure this out?
*October 26, 2010*

**algebra**

use substitution x/3-y=3 2x+y=25
*October 25, 2010*

**ALgebra**

use substitution 3x-2y=11 x-y/2=4
*October 25, 2010*

**Chemistry**

If 4.0 g of hydrogen and 10.0 g of oxygen are mixed according to the equation 2 H2 + 02 = 2 H20, which is the limiting reagent? 1. none, they are evenly mixed 2. oxygen 3. hydrogen 4. water
*October 24, 2010*

**agriculture**

how long does it take to farm an acre if your implement is 42.5 feet wide and you are going 6 mile an hour
*October 22, 2010*

**calculus**

use implcit differenciation to find an eqaution of both the tangent line to the ellipse: 2x^2 + 4y^2 = 36 that passes through the points: 14,3
*October 19, 2010*

**Physics**

How much work must you do to push a 10 kg block of steel across a steel table friction is 0.6 at a steady speed of 1.3 m/s for 9.8 s?
*October 17, 2010*

**Physics**

A 2.9 kg block slides along a frictionless surface at 1.3 m/s. A second block, sliding at a faster 5.0 m/s, collides with the first from behind and sticks to it. The final velocity of the combined blocks is 2.7 m/s. What was the mass of the second block?
*October 17, 2010*

**statistics**

Probability = N!/(r![N-r]!) * p^r * q^(n-r) Probability = 200!/(40![200-40]!) * (1/6)^40 * (5/6)^(200-40) Probability = 0.032865
*October 16, 2010*

**calculus**

First step, find any vertical asymptotes. 1 + e^(1/x) = 0 e^(1/x) = -1 1/x = ln(-1) Obviously since this is impossible, there are no vertical asymptotes. Since we have a fraction in the function (1/x), and the x is in the denominator, we can conclude that f(x) does not exist ...
*October 16, 2010*

**teacher aide curriculum content**

i need help with all the answers on the teacher aide exam 02603800
*October 16, 2010*

**teacher aide curriculum content**

what is a good way to motivate elementary students to learn math
*October 16, 2010*

**teacher aide**

when are children first developmentally ready to begin learning science
*October 16, 2010*

**physics**

In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 10-27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the gold nucleus, is...
*October 14, 2010*

**algebra**

15s-14s=18+63 s(15-14)=81 s=81/(15-14) s=81
*October 14, 2010*

**3rd grade**

You need to use the strategy of working backwards day 5= 125 hot dogs day 4= 125-7=??? day 3= ???-7 etc. day 2= day 1=
*October 14, 2010*

**math**

estimate 15/21 to 15/20 which reduces to 3/4 of a whole. Now look at your second fraction, it is an improper fraction and reduces to 1 2/17. Since it is over one whole, and the other fraction is part of a whole, it is larger.
*October 14, 2010*

**algebra**

solving equations -x^2, if x=-1, etc
*October 14, 2010*

**Physics**

A 1200 kg sports car accelerates from 0m/s to 27m/s in 10s. What is the average power of the engine?
*October 14, 2010*

**math**

can you show me the steps to the problem> x+x+52+2(x-4) = 71+1
*October 13, 2010*

**History**

what were the causes and effects during DeValera’s era in ireland that created the belief that evil in literature and journalism came from abroad and that censorship was necessary to preserve Irish identity?
*October 12, 2010*

**Chemistry**

What mass of MgSO4 · 7H2O is required to prepare 800 mL of a 0.442MMgSO4 solution? Answer in units of g. Would you use the formula M1V1=M2V2?
*October 11, 2010*

**Chemistry PLEASE HELP!**

When 0.042 moles of aluminum sulfate are dissolved in enough water to make 763 milliliters of solution, what is the molarity of sulfate ions? Answer in units of M.
*October 11, 2010*

**chemistry**

Protons= atomic # Electrons= the atomic # +/- charge (if its a positive charge u minus if its a negative charge u plus)
*October 11, 2010*

**Chemistry**

What mass of MgSO4 · 7H2O is required to prepare 800 mL of a 0.442MMgSO4 solution? Answer in units of g.
*October 11, 2010*

**Chemistry**

When 0.016 moles of lead(II) nitrate are dissolved in enough water to make 748 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of M.
*October 11, 2010*

**Chemistry**

Calculate the molality of CsCl in a 18% by mass aqueous solution. Answer in units of m.
*October 11, 2010*

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