Saturday

April 25, 2015

April 25, 2015

Total # Posts: 4,336

**Calculus**

V= 4/3 pi r^3 V= 4pi r^2 dt/dv 4= 4 pi (9)^2 dt/dv 1/81 pi
*November 12, 2012*

**Math**

$32.00
*November 12, 2012*

**Math **

There was an error... A tax charges $14 for a 7-mile trip. How much will the taxi charge for a 16-mile trip?
*November 12, 2012*

**Math**

A taxi charges 414 for a 7-mile trip. How much will the taxi charge for 16-mile trip?
*November 12, 2012*

**Physis**

A projectile is launched with an inital velocity of 30.0m/s at an angle of 60 degrees above the horizontal. How far does it travel. Please show me how to solve this.
*November 12, 2012*

**Math equation**

y + 1776 -1776 = 2003 - 1776 y = 227 y + 1776 = 2003 227 + 1776 = 2003 2003 = 2003 Checked But how is this correct true?
*November 12, 2012*

**Math equation**

I'm suppose to create my own equation like the one I showed you above. Is the first one right? It is solving subtraction equations where I add or subtract each side to undo the subtraction. Does this make sense? So if I were to say y + 1776 = 2003 this would be the right ...
*November 12, 2012*

**Math equation**

The Congress of the United States signed the Declaration of Independence in 1776. Find the difference in years between the year that the Congress signed this document and the year that you were born. I was born 2003. Is this right? y - 1776 = 2003 or 2003 - 1176 = y 6th grade ...
*November 12, 2012*

**Physics**

The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth
*November 9, 2012*

**Algebra**

HELP!!! Super confused. Here's the problem. Today while Don was swimming, he started wondering how many lengths he would have to swim in order to swim different distances. At one end of the pool, he stopped, gasping for breath, and asked the lifeguard. She told him that 1 ...
*November 9, 2012*

**Math**

Two cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. Find the probability of the given event. A pair is not drawn.
*November 8, 2012*

**Physics**

The pilot of an aircraft wishes to ﬂy due west in a 52.6 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 154 km/h. A.) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of ◦ (...
*November 8, 2012*

**Physics**

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts on each of is feet ...
*November 7, 2012*

**math**

Tickets to the Senior Class Play cost $3.00 for students, $8.00 for adults, and $5.00 for senior citizens. At Friday night's performance, there were 121 students, 174 adults, and 32 senior citizens. At Saturday night's performance, there were 183 students, 140 adults, ...
*November 3, 2012*

**Physics**

A small 0.469-kg object moves on a frictionless horizontal table in a circular path of radius 1.42 m. The angular speed is 6.31 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone under...
*November 3, 2012*

**Physics**

As seen from above, a playground carousel is rotating counterclockwise about its center on frictionless bearings. A person standing still on the ground grabs onto one of the bars on the carousel very close to its outer edge and climbs aboard. Thus, this person begins with an ...
*November 3, 2012*

**Physics**

Two window washers, Bob and Joe, are on a 3.00-m-long, 335-N scaffold supported by two cables attached to its ends. Bob weighs 755 N and stands 1.00 m from the left end,Two meters from the left end is the 500-N washing equipment. Joe is 0.500 m from the right end and weighs ...
*October 31, 2012*

**Intro to physics**

A space station shaped like a giant wheel has a radius 105 m and a moment of inertia of 5.09 108 kg · m2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1g. When 100 people move to the center of the ...
*October 31, 2012*

**english**

possesses?
*October 30, 2012*

**english**

She possess a can do attitude. Is this sentence correct?
*October 30, 2012*

**Physics**

A man drags a 71.5-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 27.0° above the horizontal, and the strap is inclined 66.5° above the horizontal. The center of gravity of the crate ...
*October 29, 2012*

**Physics**

The blades of a ceiling fan have a radius of 0.348 m and are rotating about a fixed axis with an angular velocity of +1.63 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.16 rad/s^2. After 0.545 s have elapsed ...
*October 28, 2012*

**Physics**

The differential gear of a car axle allows the wheel on the left side of a car to rotate at a different angular speed than the wheel on the right side. A car is driving at a constant speed around a circular track on level ground, completing each lap in 19.9 s. The distance ...
*October 28, 2012*

**Health**

it's D.all of the above
*October 25, 2012*

**Chemistry Help**

The specific heat of zinc is 0.386 J/g degrees Celsius. How many joules would be released when 454 grams of Zinc at 96.0 degrees Celsius were cooled to 28.0 degrees Celsius.
*October 25, 2012*

**Precalculus**

Show that the equation x^3+ x^2-3=0 has no rational roots, but that it does have an irrational root between x=1 and x=2
*October 23, 2012*

**Precalculus**

find the equation of the cubic equation show graph passes through the points (3,0) and (1,4) and is tangent to the axis at the origin??? I honestly cannot figure this out and can you explain the graph to me too?
*October 23, 2012*

**Precalculus**

An open box is to be formed from a square sheet of carboard (square is 10x10 cm) by cutting squares and then folding up the sides. (the squares cut off are just the corners as they are labeles as an x by x). A) Find a function for the volume of the box. State the domain of ...
*October 23, 2012*

**Math**

the first part is just 3/12 + 4/12 + 2/2 = 3/12 + 4/12 + 12/12= 19/12 of the school. The second part is 19/12 - 3/12 = 16/12
*October 23, 2012*

**math**

Malia = 2*Eileen 6=2*Eileen Eileen=3 laps Eileen does half a lap while Malia does 1 lap, so like 6 i think
*October 23, 2012*

**English**

you mean like as in one of the knights of the round table in king arthur?
*October 23, 2012*

**Precalculus**

If p(x) is a cubic polynomial such that p(0) = 0, P(2) = -4 and P(x) is positive only when x > 4 find p(x).
*October 23, 2012*

**Precalculus**

If p(x) is a cubic polynomial such that p(0) = 0, P(2) = -4 and P(x) is positive only when x > 4 find p(x).
*October 23, 2012*

**math**

28 x 2 = 56 is the answer
*October 23, 2012*

**Precalculus**

can you just tell me how you got to dV/dx = 100-80x-12^2
*October 23, 2012*

**Precalculus**

Im only in Precalc
*October 23, 2012*

**Precalculus**

i dont understand what is happening on the third line of B
*October 23, 2012*

**Precalculus**

An open box is to be formed from a square sheet of carboard (square is 10x10 cm) by cutting squares and then folding up the sides. (the squares cut off are just the corners as they are labeles as an x by x). A) Find a function for the volume of the box. State the domain of ...
*October 23, 2012*

**Chemistry**

magnet
*October 23, 2012*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20x10^4 rad/s to an angular speed of 3.14x10^4 rad/s. In the process, the bit turns through 1.92x10^4 rad. Assuming a constant angular acceleration, how long would it take the bit to reach ...
*October 23, 2012*

**Physics**

I think it meant velocity, sorry
*October 23, 2012*

**Physics**

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.025 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.060 kg and is initially at rest. The collision is not head-...
*October 23, 2012*

**Chemistry**

25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go about solving this? I ...
*October 22, 2012*

**Chemistry**

25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go about solving this? I ...
*October 22, 2012*

**Chemistry**

25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go about solving this? I ...
*October 22, 2012*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20 104 rad/s to an angular speed of 3.14 104 rad/s. In the process, the bit turns through 1.92 104 rad. Assuming a constant angular acceleration, how long would it take the bit to reach its...
*October 22, 2012*

**Physics**

An elastic collision occurs between two pucks on an air-hockey table. Puck A has a mass of 0.025 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.060 kg and is initially at rest. The collision is not head-on...
*October 22, 2012*

**Chemistry**

Write the chemical equation for the standard molar enthalpy of formation of periodic acid, H5IO6.
*October 21, 2012*

**French 2**

my skirt is very long
*October 21, 2012*

**Logarithms**

Solve: 3 log 10^x = 4.2 the 10 is underneath the log I got a weird number in scientific notation. 2.511... X 10^9
*October 21, 2012*

**Logarithms**

Okay thank you for the explanation!! Logarithms are difficult and get some use to.
*October 21, 2012*

**Logarithms**

log10^x=4 the 10 is under the log
*October 21, 2012*

**Logarithms**

Solve Log base 10^x=4
*October 21, 2012*

**Logarithms**

Okay thanks. I think I got it now.
*October 21, 2012*

**Logarithms**

Okay so how would I calculate the answer from that step?
*October 21, 2012*

**Logarithms**

Solve 7^3x=623
*October 21, 2012*

**Chemistry**

If the standard enthalpy of formation of PH3(g) is +5.4 kJ mol-1, calculate the reaction enthalpy for 2PH3(g)--->2P(s)+3H2(g)
*October 20, 2012*

**Chemistry**

When 10.0 g of ammonium nitrate (molar mass= 80 g/mol) are dissolved in 1.00 L of water in a bomb calorimeter with a heat capacity of 2.30 kJ/ K, the temp drops 1.52 K. What is the molar enthalpy of solution of ammonium nitrate?
*October 20, 2012*

**Chemistry**

The standard enthalphies of formation of ozone, O3(g), and oxygen atoms are +142.70 and +249.17 kJ/mol. Calculate the reaction enthalpy for 2O2(g)-->O3(g)+O(g)
*October 20, 2012*

**PHI 103 Informal Logic**

4. After being told that she is being punished for lying, a child responds by telling her mother that she also lied. This response may involve which fallacy? (Points : 1) Ad homimen (tu quoque) Ad verecundiam (ex libris) Ad misericordiam (ex ante) Ad baculum (antebellum
*October 20, 2012*

**Chemistry**

How many mL of 0.200 M H3PO4(aq) must be added to 25.0 mL of 0.0888 M BaCl2(aq) to precipitate all the barium as barium phosphate?
*October 20, 2012*

**Chemistry**

Calculate the number fo moles of NaOH(aq) needed to react completely with 125 mL fo 6.00 M H2SO4(aq)
*October 20, 2012*

**Chemistry**

**SNO2(s)
*October 20, 2012*

**Chemistry**

Please show me how to work! thanks When Snno2(s) is formed form the comustion of gray tin, the reaction enthalpy is -578.6 kJ, and when white tin is burned to form SnO2(s), the reaction enthalpy is -580.7 kJ. Calculate the reaction enthalpu for Sn(gray)-->Sn(white)
*October 20, 2012*

**Chemistry**

Please show me how to work! Ethane, C2H6(g) can be made by reaction of hydrogen gas with acetylene, C2H2(g). the standard enthalpies of formation of ethane and acetylene are -84.68 and +226.73 kJ mol-1, respectively. what is the reaction enthalpy for the production of one mole...
*October 20, 2012*

**Chemistry**

If the standard enthalpy of combustion of octane, C8H18(l) is -5471 kJ/mol, calculate the enthalpy change when 1.00 kg of octane are burned. the molar mass of octane is 114 g/mol
*October 20, 2012*

**Gen Chem**

Ethane, C2H6(g) can be made by reaction of hydrogen gas with acetylene, C2H2(g). the standard enthalpies of formation of ethane and acetylene are -84.68 and +226.73 kJ mol-1, respectively. what is the reaction enthalpy for the production of one mole of ethane? Write the ...
*October 20, 2012*

**Gen Chem**

If the standard enthalpy of combustion of octane, C8H18(l) is -5471 kJ/mol, calculate the enthalpy change when 1.00 kg of octane are burned. the molar mass of octane is 114 g/mol
*October 20, 2012*

**Math**

I got a magnitude of 6.1. Is that correct?
*October 20, 2012*

**Math**

What magnitude of earthquake would release energy equivalent to 35 trillion jules? I know the formula is: E= (2.5 X 10^4) X 10^1.5 X M
*October 20, 2012*

**Chemistry**

12.5
*October 19, 2012*

**ap chemistry :(**

consider the reaction C6H14 + 9.5O2 yields 6CO2 + 7H2O at constant pressure. which response is true? 1. work may be done on or by the system as the reaction occurs, depending upon the temperature. 2. work is done on the system as the reaction occurs. 3. no work is done as the ...
*October 18, 2012*

**Force Physics**

A block with a mass of 12 kg and a sphere with a mass of 10 kg is suspended by two spring scales. What is the reading on the top and bottom scale?
*October 18, 2012*

**math s**

Solve 16x – 15 = –5x + 48
*October 17, 2012*

**math**

7 – 4(x + y) + 2(x – 3y) A 7 – 2x – 7y B.7 – 2x – 10y(*) C.7 + 2x – 7y d.7 + 2x – 10y i think its be im not aure can some one check my ansswer
*October 17, 2012*

**Pre-Algerbra**

quadrantlll (-2,-4)
*October 17, 2012*

**Math**

If the pH of a solution increases by 4 (from 4 to 8), how much does the hydrogen ion concentration change? Does the change make the solution more acidic or more basic?
*October 17, 2012*

**history**

Loyalists believed Patriots were breaking the law. should return to England. should support British taxation. were too aristocratic. i think its c im not sure
*October 16, 2012*

**history**

i got b is that right
*October 16, 2012*

**Math**

My median answer is 19 for the ages of houses. How do I explain this represents the ages of the houses best? having trouble wiht explaining it.
*October 16, 2012*

**Physics**

A surfer is catching a wave. Suppose she starts at the top of the wave with a speed of 1.3 m/s and moves down the wave until her speed increases to 8.0 m/s. The drop in her vertical height is 2.8 m. If her mass is 59 kg, how much work is done by the (nonconservative) force of ...
*October 15, 2012*

**Physics**

A 1600-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 32 m/s. Going up a hill, the car's engine produces 54 hp more power to sustain the constant velocity than it does going down the ...
*October 15, 2012*

**College Chem**

The density of the Earth is about 3.5g/cubic centimeters. If the Earth has a radius of 1.126 by 10 (to the seventh power) meters, what is its mass? (hint: volume= 4(pie)r(to the third power)/3; 1 meter=100 centimeters
*October 14, 2012*

**Chemistry**

Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free energy ...
*October 14, 2012*

**Physics**

Block A and Block B in the figure below are connected by a string of negligible mass. There is a force on A with a magnitude of FA=20N and a force on B with a magnitude FB=34N in the directions shown in the figure. What is the tension in the string?
*October 14, 2012*

**Math**

How did you get that?
*October 14, 2012*

**Math**

The doubling time of a city's population is 17 years. How long does it take for the population to quadruple?
*October 14, 2012*

**Logarithms**

Ok thanks
*October 14, 2012*

**Logarithms**

if log base 10 of 2 = .301 then what is log base of 10 of 2000? I know how to solve with a calculator but I'm having a hard time doing it without one.
*October 14, 2012*

**Logarithms**

It's fine. Thanks
*October 14, 2012*

**Logarithms**

Yes Damon thats what I meant. Thanks!
*October 14, 2012*

**Logarithms**

Using the approximation log10^2=0.301, find: log10^8
*October 14, 2012*

**Chemistry**

A gas-phase reaction has Kp = 2.44 × 10 20 at 25 ◦ C. Calculate ∆G 0 for this reaction. Answer in units of kJ/mol rxn
*October 14, 2012*

**Chemistry**

The standard molar Gibbs free energy of formation of NO2 (g) at 298 K is 51.30 kJ · mol −1 and that of N2O4 (g) is 97.82 kJ · mol −1 . What is the equilibrium constant at 25 ◦ C for the reaction 2 NO2(g) <=> N2O4(g) ?
*October 14, 2012*

**Physics**

When a spacecraft travels from the Earth to the Moon, both the Earth and the Moon exert a gravitational force on the spacecraft. Eventually, the spacecraft reaches a point where the Moon's gravitational attraction overcomes the Earth's gravity. How far from the Earth&#...
*October 13, 2012*

**stats**

blood cholesterol level of all men age 20-24 follows N(188,41) where the units for the men and standard deviation are in mg/dl. what is the probability that the sample mean takes a value between 185 and 191 if we sample 1000 men
*October 12, 2012*

**Science**

When a car slams on its brakes what provides friction that helps the car stop? What kind of energy is produced?
*October 11, 2012*

**Maths Percentage (6th Grade)**

David has $5 in his wallet. This was 10% of the amount that he received from his mother. Find the total amount of money that David received from his mother. 35% of the number of books Ibrahim owns are fiction boos, find: a.) the total number of books he owns. b.) the number of...
*October 11, 2012*

**Math**

ok stuck again. Got everything else calculated, but why is the median the best choice? is it because 19 is the closest to the mean, 16.75 ? Can you explain??
*October 10, 2012*