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October 20, 2014

Posts by sam


Total # Posts: 4,032

physics
A tow truck does 3.5 k j of pulling horizontally on a stalled truck to move 2.8 m horizontally in the direction of the force. What is the magnitude of the force.
November 13, 2012

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

Math
no
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

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

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