Tuesday

March 31, 2015

March 31, 2015

Total # Posts: 4,321

**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*

**pre-ap Algebra 2**

write a polynomial function f of least degree that has the rational coefficients, a leading coefficient of 1, and the given zeros. Given zeros: -2,2,-1,3, sqrt 11
*October 10, 2012*

**physics**

Two mountain climbers are working their way up a glacier when one falls into a crevasse. The icy slope can be considered frictionless. Sue's (the one who fell) weight is pulling Paul up the 45 degree slope. If Sue's mass is 66 kg and if she falls 2 min 10 s (starting ...
*October 9, 2012*

**Integrated 2**

Aaron has 20 dimes and nickels which together total is 1.40 how many of each does he have
*October 9, 2012*

**Physics**

Two pole-vaulters just clear the bar at the same height. The first lands at a speed of 8.50 m/s, and the second lands at a speed of 8.80 m/s. The first vaulter clears the bar at a speed of 1.50 m/s. Ignore air resistance and friction and determine the speed at which the second...
*October 9, 2012*

**Physics**

This doesn't give me the correct answer according to the assignment program :/
*October 9, 2012*

**Physics**

A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.88 m. With the string hanging vertically, the object is given an initial velocity of 1.7 m/s parallel to the ground and swings upward on a ...
*October 9, 2012*

**Finite**

Assume that the coin is weighted so that Pr[H] = [ 1/11], and that it is flipped 9 times. The random variable X is defined as the number of heads in the 9 flips. What is E[X]?
*October 8, 2012*

**Finite**

Assume that the box contains balls numbered from 1 through 28, and that 3 are selected. A random variable X is defined as 1 times the number of odd balls selected, plus 2 times the number of even. How many different values are possible for the random variable X? I know that is...
*October 8, 2012*

**Physics**

An American bald eagle heads south at 5.5 m/s, but encounters a wind blowing from the east at 1.9 m/s. By how many degrees will she be blown o course?
*October 8, 2012*

**Chemistry**

One mole of carbon (12.0 g) in the form of crystalline graphite is burned at 25 ◦ C and 1.000 atm pressure to form CO2(g). All of the heat produced is used to heat a 4560 g bath of liquid water, originally at 25 ◦ C. What is the ﬁnal temperature of the water...
*October 7, 2012*

**Chemistry**

Given the standard heats of reaction Reaction ∆H0 M(s) + 2 X2(g) → MX4(g) −123.7 kJ/mol X2(g) → 2 X(g) +297.3 kJ/mol M(g) → M(s) −25.1 kJ/mol calculate the average bond energy for a single M- X bond
*October 7, 2012*

**Chemistry**

The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 4.7 grams of manganese are oxidized by oxygen gas to Mn2O3 at standard state conditions? Answer in units of kJ
*October 7, 2012*

**physics**

A hot air balloon descends with an overall velocity of 4.2 m/s at an angle of 36.8⁰ below the horizontal. what is the horizontal velocity of the balloon?
*October 7, 2012*

**physics**

A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.18. Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
*October 3, 2012*

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