Tuesday

September 23, 2014

September 23, 2014

Number of results: 7,464

**Physics**

Two cylindrical rods are made of the same material and have the same length but one is hollow and other is solid. Both are heated to same increase in temperature. Which rod expands more? From my understanding of linear thermal expansion, linear thermal expansion only depends ...
*July 23, 2012 by James*

**physics**

A material of unknown composition with an initial length of 2.9 m is found to expand by 0.37 mm when it is heated by 15 K. What is the coefficient of thermal expansion of this material? K-1
*November 14, 2010 by Rayler *

**Physics**

Wine bottles are never completely filled: a small volume of air is left in the glass bottle's cylindrically shaped neck (inner diameter d = 18.5mm) to allow for wine's fairly large coefficient of thermal expansion. The distance H between the surface of the liquid contents and ...
*December 11, 2009 by Britney*

**physics**

How do we compensate for thermal expansion /contraction in the construction of railway tracks? How do we compensate for thermal expansion /contraction in the construction of steel bridges? How do we compensate for thermal expansion /contraction in the construction of metal ...
*October 4, 2011 by anil*

**Physics**

Consider a cube of an unknown material. When heated by 10 K, each side expands by 1%. Using *only this information*, what is the ratio between the coefficent of volume expansion and the coefficient of linear expansion (i.e., beta/alpha)? Express your answer to two significant ...
*November 23, 2012 by StressedStudent*

**chemistry**

A metal pipeline is laid to carry oil 500 miles across desert.Temp @ night is 30 F: during day temp is 130 F? The linear coefficient of thermal expansion of metal is 0.000006, how much expansion and contraction along pipeline must the design engineer plan for.. a. 475 ft b. ...
*May 18, 2010 by joe*

**Materials**

What is the thermal expansion of brass per deg F? http://www.engineeringtoolbox.com/thermal-expansion-metals-d_859.html http://www.engineeringtoolbox.com/thermal-expansion-metals-d_859.html
*July 3, 2007 by Tom*

**science**

deltaL= L * coeff thermal expansion Al * delta Temp What is the linear expansion for 1 Deg F change in a piect of aluminum that is 1.9 inches long?
*January 16, 2007 by bobpursley*

**physics**

A glass window pane is exactly 23 cm by 38 cm at 10oC. By how much has its area increased when it temperature is 49oC, assuming that it can expand freely? Take the coefficient of thermal expansion for the glass to be exactly 9 x 10-6/Co
*April 21, 2011 by niki*

**physics**

A glass window pane is exactly 23 cm by 38 cm at 10oC. By how much has its area increased when it temperature is 49oC, assuming that it can expand freely? Take the coefficient of thermal expansion for the glass to be exactly 9 x 10-6/Co
*April 22, 2011 by tony*

**Physics**

1. A Pyrex plate is filled to the brim with liquid pumpkin pie filling, then baked at 190 degrees Celsius. The pie plate is h=3.60 cm deep, but the sides of the dish taper from the top to bottom so that the bottom is a circle of diameter d2=25.8cm, while the top opening is a ...
*January 22, 2013 by Dawna*

**Physics**

A metal tank with volume 3.10 L will burst if the pressure of the gas it contains exceeds 100 atm. (a) If 11.0 mol of an ideal gas is put into the tank at a temperature of 23.00C, to what temperature can the gas be warmed before the tank ruptures? You can ignore the thermal ...
*February 25, 2010 by Baker*

**Physics please check**

For the highest accuracy, would you choose an aluminum or a steel tape rule for year-round outdoor use? a. steel tape rule b. either of the two c. aluminum tape rule Why? I am not quite sure what this question is asking. I took an educated guess of steel because all the number...
*April 24, 2007 by Mary*

**Chemistry**

At 298K and 1bar pressure, the density of water is 1.00 g/cm^3 , Cpm = and 75.3 J/Kmol. The change in volume with temperature is given by delta V = ViB(deltaT), where B, the coefficient of thermal expansion, is 2.07 * 10^-4 K^-1. If the temperature of 350g of water is ...
*September 24, 2012 by Danielle*

**physics**

A tungsten wire has a radius of 0.077 mm and is heated from 20.0 to 1205 °C. The temperature coefficient of resistivity is α = 4.5 10-3 (C°)−1. When 110 V is applied across the ends of the hot wire, a current of 1.3 A is produced. How long is the wire? Neglect any ...
*January 27, 2014 by Dee*

**physics**

A 3.00-liter aluminum cylinder at 5.00°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 52.0°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the possibility of ...
*June 13, 2011 by Kristen*

**Physics**

A 3.00-liter aluminum cylinder at 5.00°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 52.0°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the possibility of ...
*June 15, 2011 by Justin*

**Physics**

A ruler is accurate when the temperature is 25°C. When the temperature drops to -16°C, the ruler shrinks and no longer measures distances accurately. However, the ruler can be made to read correctly if a force of magnitude 1.2 103 N is applied to each end so as to stretch it ...
*April 5, 2008 by Katie*

**Physics**

A ruler is accurate when the temperature is 25°C. When the temperature drops to -16°C, the ruler shrinks and no longer measures distances accurately. However, the ruler can be made to read correctly if a force of magnitude 1.2 103 N is applied to each end so as to stretch it ...
*April 6, 2008 by jack*

**Physics**

A ruler is accurate when the temperature is 25°C. When the temperature drops to -16°C, the ruler shrinks and no longer measures distances accurately. However, the ruler can be made to read correctly if a force of magnitude 1.2 103 N is applied to each end so as to stretch it ...
*April 11, 2008 by Johnson*

**Physics**

In my lab of linear expansion, I need to find out the coefficient of linear expansion. The data I got for an aluminum rod are initial length is 59.7cm, the change in length is 95mm, the change in temperature is 75.4 Celsius degrees. I converted 59.7cm to 0.597m, and 95mm to 0....
*June 13, 2011 by Lynn*

**Physical Chemistry3**

The specific volume of water is given quite accurately by the empirical relation ln(v) = −6.7081 + 1.01257 ln(T) + 280.663/T Use this relation to derive an equation for the coefficient of thermal expansion and determine the temperature at which this quantity is equal ...
*September 29, 2008 by Amber*

**Physical Chemistry3**

The specific volume of water is given quite accurately by the empirical relation ln(v) = −6.7081 + 1.01257 ln(T) + 280.663/T Use this relation to derive an equation for the coefficient of thermal expansion and determine the temperature at which this quantity is equal ...
*September 29, 2008 by Amber*

**Probability**

Roll 3 dice. What is the probability of getting a sum of: A) sum of 7: 15/216 B) sum of 8: 21/216 C) sum of 11: 27/216 D) sum of 12: 25/216 Are these correct? How many ways are there to choose 3 numbers ranging from 1 to 6 such that the sum is N? Consider the function: F(X) = ...
*February 2, 2007 by Heath*

**physics**

The height of the Washington Monument is measured to be 170 m on a day when its temperature is 35.0°C. What will the change in its height be on a day when its temperature falls to -12.0°C? Although the monument is made of limestone, take the thermal coefficient of expansion to...
*December 6, 2013 by angela *

**physics**

Two pieces of metal (A and B) are identical in every way, except that A has a much larger thermal expansion coefficient. If equal amounts of heat are added to both pieces of metal, which metal does more work on its surroundings? 1. A 2. B 3. They do the same work. 4. Unable to...
*January 13, 2013 by physicshelp*

**Binomial expansion**

The coefficient of x^2 in the expansion of (4-3x)^n as a series of ascending powers of x is -9/64. Show that n satisfies the equation 4^(n+1)=2/[n(1-n)] and hence verify that n=1/2. I can do the first part of the problem: 4^n*3^2*n(n-1)/2!*2^4=-3^2/2^6 4*4^n*n(n-1)=-2 4^(n+1)*...
*February 29, 2012 by Helga*

**chemistry**

Consider two glasses. Glass A has a composition of 100% SiO2. Glass B has a composition of 25% Na2O - 75% SiO2. (a) Which sample has a shorter average bond length (r)? (b)Which sample has a higher thermal expansion coefficient? (c) Which sample has a lower viscosity?
*April 10, 2013 by Anonymous *

**phys**

The coefficient of expansion of a certain steel is 0.000012 per C^(degree) . The coefficient of volume expansion, in (C^(degree))^-1, is: A) (0.000012)^3 B) (4pi/3)(0.000012)^3 C) 3 x 0.000012 D) 0.000012
*July 7, 2014 by jay*

**science**

what are the pros and cons of thermal expansion?
*October 12, 2009 by brandon*

**physics**

4.A steel rod is heated to 200 degrees Celcius and is then rigidly clamped at both ends and allowed to cool. Determine the temperature at which the rod will break if the tensile strength, coefficient of linear thermal expansion and youngs modulus of elasticity of the steel are...
*January 19, 2014 by moody*

**Binomal Theorem**

1A> What is the coefficient of x^(2r) in the expansion of (1-x^2)^n, where n is a positive integer ? 1B> Find the coefficient of (1+x)^7 (1-x) ^8 Thanks for your help :)
*August 4, 2008 by Tommy*

**Physics**

During an all-night cram session, a student heats up a 0.451 liter (0.451 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19.5 °C, and the beaker is filled to the brim. A short time later when the student returns, the temperature has risen to 96....
*November 17, 2006 by Jena*

**Physics**

Many hot-water heating systems have a reservoir tank connected directly to the pipeline, so as to allow for expansion when the water becomes hot. The heating system of a house has 74 m of copper pipe whose inside radius is 9.10 10-3 m. When the water and pipe are heated from ...
*April 6, 2008 by Maggie*

**Calculus**

Find the constant term in the expansion of [x + (3/x squared)]^9 Find the coefficient of (x)^4(y)^9 in the expansion of (x + (2)(y)^3)^7
*January 21, 2008 by Daisy*

**maths**

In the expansion of (1-2x)^11 the coefficient of x^3 is k times the coefficient of x^2. Evaluate k.
*August 6, 2013 by Shane*

**Physics**

An aluminum can is filled to the brim with a liquid. The can and the liquid are heated so their temperatures change by the same amount. The can’s initial volume at 8 °C is 6.9 × 10-4 m3. The coefficient of volume expansion for aluminum is 69 × 10-6 (C°)-1. When the can and the...
*December 5, 2012 by StressedStudent*

**physics**

An aluminum can is filled to the brim with a liquid. The can and the liquid are heated so their temperatures change by the same amount. The can’s initial volume at 8 °C is 4.8 × 10-4 m3. The coefficient of volume expansion for aluminum is 69 × 10-6 (C°)-1. When the can and the...
*July 25, 2013 by justin*

**Physics**

An aluminum can is filled to the brim with a liquid. The can and the liquid are heated so their temperatures change by the same amount. The can’s initial volume at 8 °C is 3.5 × 10-4 m3. The coefficient of volume expansion for aluminum is 69 × 10-6 (C°)-1. When the can and the...
*February 7, 2014 by Nicj*

**physics**

How do we compensate for thermal expansion /contraction in the construction of steel bridges?
*October 4, 2011 by anil*

**physics**

How do we compensate for thermal expansion /contraction in the construction of railway tracks?
*October 4, 2011 by anil*

**maths**

The coefficient of x^2 is 69 in the expansion of (1-ax)^24, where a>0. Find the coefficient of x^3.
*August 8, 2013 by Shane*

**physics**

How do we compensate for thermal expansion /contraction in the construction of metal pipes for carrying steam?
*October 4, 2011 by anil*

**tenth grade science**

What can you conclude about the effect of the thermal expansion of water on sea level?
*October 24, 2011 by margaret*

**PHYSICS 102E**

1. A glass flask whose volume is exactly 1000cm^3 at 0 degrees Celsius is completely filled with mercury at this temperature. When the flask and mercury are heated to 100 degrees Celsius, 15.2cm^3 of mercury overflow. If the coefficient of volume expansion of mercury is 18 x ...
*December 13, 2008 by Akitsuke*

**thermal Energy**

Suppose a bar 1 m long expands .5 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated? If each one meter expands a half centimeter, then one hundred meters will expand 100*.5cm. Think on that. NO I DONT UNDRERSTAND WHAT THAT MENS...
*June 17, 2005 by Jarrad Schomaker*

**physics**

what is thermal equilibrim, and what is thermal energy? what are fluid molecules? does convectin involve the movement of matter in a circular manner only? thermal equilibrium: no net flow of heat in or out. thermal energy: The sum of all the interanal stored energy in the ...
*January 29, 2007 by minerva*

**physics**

Two wires have the same cross-sectional area and are joined end to end to form a single wire. The first wire has a temperature coefficient of resistivity of α1 =0.00480 (C°)-1 and a resistivity of 4.90 x 10-5Ω m. For the second, the temperature coefficient is α2...
*January 22, 2013 by PLease HELP*

**PHYSICS**

Two wires have the same cross-sectional area and are joined end to end to form a single wire. The first wire has a temperature coefficient of resistivity of α1 =0.00603 (C°)-1 and a resistivity of 5.00 x 10-7Ω m. For the second, the temperature coefficient is α2...
*January 26, 2013 by PLEASE HELP *

**Physical Science **

Energy from the sun reaches Earth mostly by A. conduction. B. convection. C. radiation. D. thermal expansion. I think it's A.
*September 3, 2013 by Danny *

**physics PLEASE HELP**

Two wires have the same cross-sectional area and are joined end to end to form a single wire. The first wire has a temperature coefficient of resistivity of α1 =0.00480 (C°)-1 and a resistivity of 4.90 x 10-5Ω m. For the second, the temperature coefficient is α2...
*January 22, 2013 by adam h.*

**Physics**

A monoatomic gas expands isobarically.What will be the percentage of heat supplied that increases the thermal energy and that involved in doing work for expansion?
*April 9, 2012 by Tulika*

**physics**

Concrete sidewalks are always laid in sections, with gaps between each section. For example, the drawing shows three identical 2.4-m sections, the outer two of which are against immovable walls. The two identical gaps between the sections are provided so that thermal expansion...
*July 25, 2013 by justin*

**Physics **

The Trans-Alaskan pipeline is 1300 km long, reaching from Prudhoe Bay to the port of Valdez, and is subject to temperatures ranging from -72°C to +38°C. (a) How much does the steel pipeline expand due to the difference in temperature? (The coefficient of linear expansion of ...
*November 14, 2012 by Madison*

**Math**

Use the Binomial Theorem to determine the coefficient of x^14 in the expansion of (3x^2 − 1/ 3)^ 16 . Express the coefficient as a fraction in its lowest terms. Please help me with this I'm getting nowhere. And please explain the logic behind! Thanks so much
*May 30, 2010 by Chamberlain*

**PHYSICS**

The Trans-Alaskan pipeline is 1300 km long, reaching from Prudhoe Bay to the port of Valdez, and is subject to temperatures ranging from -72°C to +38°C. (a) How much does the steel pipeline expand due to the difference in temperature? (The coefficient of linear expansion of ...
*November 14, 2012 by Sarah*

**Physics **

Imagine you've finished this academic year and gone home to enjoy your summer vacation. During one of your days of relaxation and non-academic bliss, however, you realize you need to run a few errands. After stopping at the gas station where you fill the gas tank to its ...
*November 16, 2010 by Need Help*

**physics**

A hollow aluminum cylinder 22.0 cm deep has an internal capacity of 2.000 L at 21.0°C. It is completely filled with turpentine at 21.0°C. The turpentine and the aluminium cylinder are then slowly warmed together to 87.0°C. (The average linear expansion coefficient for ...
*April 6, 2012 by kevin*

**physics**

A hollow aluminum cylinder 22.0 cm deep has an internal capacity of 2.000 L at 21.0°C. It is completely filled with turpentine at 21.0°C. The turpentine and the aluminium cylinder are then slowly warmed together to 87.0°C. (The average linear expansion coefficient for ...
*April 11, 2012 by anthony *

**Intro to Physics **

The Trans-Alaskan pipeline is 1300 km long, reaching from Prudhoe Bay to the port of Valdez, and is subject to temperatures ranging from -72°C to +38°C. (a) How much does the steel pipeline expand due to the difference in temperature? (The coefficient of linear expansion of ...
*November 14, 2012 by Madison*

**Physics**

A pair of eyeglass frames made of plastic with a coefficient of linear expansion of 1.30x10-4 (Cº ) -1 have circular lens holes of diameter 4.40 cm at room temp (20º C). To what final temperature must the frames be heated in order to insert lenses 4.42 cm in diameter? (Hint: ...
*November 30, 2013 by Angie*

**Physics**

A pair of eyeglass frames made of plastic with a coefficient of linear expansion of 1.30x10-4 (Cº ) -1 have circular lens holes of diameter 4.40 cm at room temp (20º C). To what final temperature must the frames be heated in order to insert lenses 4.42 cm in diameter? (Hint: ...
*December 1, 2013 by Angie Need Help ASAP*

**physics help**

A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the boiling point of water...
*March 26, 2011 by sam*

**physics **

A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the boiling point of water...
*March 27, 2011 by kelly*

**physics II**

A certain material is in a room at 27°C. If the absolute temperature (K) of the material is tripled, its resistance doubles. (Water freezes at 273 K.) What is the value for alpha (a) the temperature coefficient of resistivity?
*July 28, 2010 by Alinkashia*

**math**

Find the coefficient of x³ in the expansion of (2x+5)^6
*February 3, 2008 by Liz*

**MATH**

find the coefficient of x^5 in the expansion (x+2)(x+1)^8
*January 18, 2012 by Aliah*

**maths**

find the coefficient of 1/x^3 in the expansion of (3x-2/x^2)^6
*March 13, 2012 by tembo*

**math**

find the coefficient of x^29 in the expansion (1+2x)^12 .(1+x)^18
*March 18, 2013 by gandhish*

**Physics**

I'm also stumped by this one: 3. A bimetallic strip (117 cm by 1 cm by 0.01cm) has aluminum (a = 23x10^-6 1/Celsius) on one side and has steel (a= 12x10^-6 1/Celsius) on the other. It is perfectly straight at room temperature (20 celsius). What change in temperature is ...
*December 11, 2012 by Darlynn*

**physics--heat**

a piece of glass is 6mm thick and the coefficient of thermal conductivity of this glass is K=0.75Wm^-1K^-1. if we add a 2nd identical piece of glass separated by an airgap of 5cm, the total thermal conduction will be reduced. what is the ratio of heat transfer by conduction ...
*March 14, 2009 by lisa*

**Calculus**

Find the coefficient of the x^2 term in the expansion of (3x - (2/x^2))^8
*January 22, 2008 by Daisy*

**Math**

What is the coefficient of the fifth term in the expansion of (x + 1)^8?
*January 26, 2009 by Raven*

**Math**

Find the coefficient of x^2y^3 in the binomial expansion of (x-2y)^5.
*April 16, 2012 by Mariette*

**Maths**

Determine the coefficient of x^5 in the binomial expansion of (2-3x)^7?
*June 21, 2012 by arif*

**maths-binomial theorem**

coefficient of x^39 in the expansion of [(1/x^2) + x^4)]^18
*March 22, 2013 by anoynomous*

**5th grade science**

blank a type of material that tries to prenent the flow of thermal energy.
*November 15, 2010 by brittany*

**same type of binomial theorem question**

Question: Find the first 3 terms in the expansion, in ascending powers of x, of (2 + x)^6. Hence, obtain the coefficient of x^2 in the expansion of (2 + x - x^2)^6 I know the first part of the question, and the first 3 terms are (64 + 192x + 240x^2 + ...) How do i use this ...
*August 4, 2009 by nicholas*

**maths**

find the first 3 terms in the expansion of (x+4)(1+3x)^-2 as a series in ascending powers. I expanded the second bracket using binomial expansion and got 1 -6x +27x^2 -108x^3 how do I combine (x+4) with the expansion? Any help would be appreciated.
*March 3, 2013 by George*

**physics**

The ocean level rises when global temperature rises, due to ____________________. A) Both of these.B) Neither of these.C) melting of ice caps at the poles.D) thermal expansion of water.
*March 24, 2012 by Kristie*

**physics**

The ocean level rises when global temperature rises, due to ____________________. A) Both of these.B) Neither of these.C) melting of ice caps at the poles.D) thermal expansion of water
*March 25, 2012 by Kristie*

**algebra**

Find the coefficient of the fifth term in the expansion(rootK+3)^8
*April 16, 2012 by jodi*

**Electric currents and magnetic fields**

Within a material, what results in the conversion of an electron's energy to thermal energy and electromagnetical energy? The electron moving makes an magnetic field, if it changes, there will be an electric field with the magnetic field. Thermal energy is the result of ...
*December 14, 2006 by Kalee*

**Thermodynamics and Heat Transfer**

A steam pipe is 75 mm external diameter and is 80 m long. It conveys steam at a rate of 1000 kg/h at a pressure of 2 Mpa. The steam enters the pipe with a dryness fraction of 0.98 and is to leave the pipe with a dryness of not less than 0.96. The pipe must be insulated – the ...
*April 21, 2010 by Raul*

**Integrated Math 1**

What is the coefficient of the xy^2 term in the expansion of (3x + y)^3? Use the binomial theorem.
*July 15, 2012 by Tifini*

**Chemistry**

The energy versus bond length for the average bond in two solids, A and B, is shown below. Atoms in the two solids have the same number of nearest neighbots. (a) Which solid has the largest cohesive energy? A or B (b) Which solid has the smallest bond energy? A or B (c) Which ...
*January 11, 2013 by Chemgam*

**physics **

- A copper cylinder is initially at 20.0oC. At what temperature will its volume be 0.15% larger than it is at 20.0oC? Take: ƒÒcofficient of thermal expansion of volume for cu= 5.1x10-5 /C
*May 28, 2013 by Janaiby*

**Physics HELP!!!!!!!!**

The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29°C the air gap between the rods is 2 x 10^-3 m. At what temperature will the gap be closed? The length of the brass rod is 2.0m The lenght of the aluminum rod is 1.0m The coefficient...
*April 14, 2007 by Mary*

**physics**

One cool 5.0 degree C spring morning, Mason lays a brick sidewalk up to his house, placing the 25 cm long bricks end to end against eachother. However, Mason forgets to leave a space for expansion and when the temperature reaches 36 degree C, the bricks buckle. How high will ...
*July 27, 2010 by Riley*

**ENGLISH**

You'll be alert, engrosed in the (14)material.And concentrated 100 percent. a) no change b) material, and c) material; and d) material and After reading it over and over, I think b) a comma after material would be the correct answer. I think this is a compound sentence, since ...
*August 5, 2010 by nancy*

**finance**

One yaer fom now, how much value creation is expected from the expansion? How much value is expected for stockholders? Bondholders? "Economic Growth " Probability W/O Expansion "With Expansion " "Total Without Expansion " "Total With Expansion " Low 0.3 $30,000,000 $33,000,000...
*May 29, 2010 by littlebit*

**Thermodynamics**

Calculate the amount of expansion occurring when a steel rail 920.000 meters in length is heated from -10.000 to 410.000 degrees Celsius. ANS = m Steel = 12 * 10 ^-6 = 0.000012 Change in length = Original length * Coefficient of linear expansion * Temperature rise. = 920m * 0....
*July 4, 2013 by Danny*

**Math - another question**

"In the expansion of (2-ax)^5 the coefficient of x^2 is 5. Find the value of a". I know I have to use the binomial theorem to help me, but I don't know how.
*May 5, 2010 by Stuck*

**math**

if the coefficient of x,x*x,x*x*x in the binomial expansion (1/2+x) whole raise to 2n are in AP. Show that 2nsquare- 9n +7 is equal to zero?
*October 12, 2013 by sandra*

**physics**

A Pyrex flask in a refrigerator at -8 degrees Celsius is filled to the top and holds exactly 1000cm^3 of ethyl alcohol. If the refrigerator fails, how much alcohol spills by the time the temperature reaches 22 degrees Celsius? The coefficient of volume expansion of ethyl ...
*November 8, 2010 by Farah*

**Math**

Determine the coefficient of the 3rd term in the expansion of (x+2y)^7. I tried using the formula,nCk (a^(n-k)) ((b)^k), but it doesn't indicate what n is.
*June 19, 2009 by sh*

**Pre calculus**

1. convert polar equation to rectangular coordinates: r^2=4sin2theta 2. find the coefficient of x^5 in the expansion (x+2)(x+1)^8
*January 18, 2012 by Rass*

**Physics**

A horizontal force of magnitude 30.0 N pushes a block of mass 3.85 kg a distance of 3.00 m across a floor, where the coefficient of kinetic friction is 0.600 a.)How much work is done by that applied force on the block-floor system? b.)During that displacement, the thermal ...
*November 30, 2010 by Sam*

**physics**

Two capacitors, identical except for the dielectric material between their plates, are connected in parallel. One has a material with a material with a dielectric constant of 2, while the other has a material with a dielectric constant of 3. What is the dielectric constant ...
*March 10, 2011 by crystal*

**math 12th grade**

1. convert polar equation to rectangular coordinates: r^2=4sin2theta 2. find the coefficient of x^5 in the expansion (x+2)(x+1)^8
*January 18, 2012 by Rass*

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