Saturday

August 27, 2016
Total # Posts: 1,016

**Physics**

After 35 minutes of jogging, at the 9-km point in a total 10-km race, jogger 1 is behind the leader and moving at the same speed. What would have to be your accelearation in order to catch up to the finish line? Assuming the leader maintains a constant speed the rest of the ...
*January 10, 2009*

**Physics**

A ball moves at 33m/s through a wall of donuts 31 cm thick. It comesout of the donut wall at 18 m/s. How much time does it spend in the wall of donuts? How thick would the wall of dounts need to be to stop the ball entirely? Is the answer 1.3 secondsand the wall would need to ...
*January 10, 2009*

**Physics**

If a fighter jet touches the runway at 220km/h, then decides to brake, and finally comes to a stop at 31 seconds later. What is the shortest runway the fighter jet can land, assuming constant deceleration starting at touchdown? Is the answer 570 meters or am I just totally off
*January 10, 2009*

**Physics**

A jet powered car leaves from Georgia to Virginia , 4600 km away. It goes 1010 km/h. At the same time another jet powered car drives from Virginia to Georgia, but it only goes 750 km/h. Where do the two jet powered cars pass each other? Km from Georgia, use two sigfigs. I say ...
*January 9, 2009*

**Physics**

You gave yourself 35 min to drive 23 miles to the party, but you are caught in traffic and average 20 miles/hour for the first 15 min. What is your average speed for the rest of your journey to the party. I am lost any help in approaching the problem wouldbe great.
*January 8, 2009*

**Physics**

Is the average velocit over a specific timeinterval always half of the instantaneous velocity at the end of the interval. I said False, because if the curveis not linear this would not be true. Would this be a a sufficent answeror am I missing anything.
*January 7, 2009*

**ALGBERA**

Can you help me set it up please?
*January 5, 2009*

**Alegbra**

Please help me solve: [SQRT(x)]=-2 1. [SQRT(2x2 - 1)]=x
*January 4, 2009*

**Math**

Thanks!
*December 31, 2008*

**Math**

Given a polynomial and one of its factors, find the remaining factors of the polynomial. Some of the factors may not be binomials. 169x^3-1690x^2-9x+90; x-10
*December 31, 2008*

**Math(Algebra 2)**

Also, if someone is still avalibe the problem is asking me to factor 2a^2-32
*December 29, 2008*

**Math(Algebra 2)**

Wait actually I meant to put a^2+4a+21 would the answer be a+7 a+3?
*December 29, 2008*

**Math(Algebra 2)**

yeS I did mean to write it the way you put it. Thank you. For the second problem, if I do this 2a^2=32 /2 a^2=16 /^2 a=4?
*December 29, 2008*

**Math(Algebra 2)**

by the way thats 2a^2 squared and a^2 squared. Thanks.
*December 29, 2008*

**Math(Algebra 2)**

All of these are different problems. Please help me. IF you only know one answer to just one problem, that is totally welcome as well. THank you. 5 > |x | + 1 2a2-32 a2 + 4a + 21
*December 29, 2008*

**American History**

Thank you.
*December 29, 2008*

**American History**

July 30,31st 1977, Sept 10, 1977 Those are the only ones
*December 29, 2008*

**American History**

The letters she wrote to her husband John Adams
*December 29, 2008*

**Economy**

Need help here plz. In a private closed economy, if aggregate expenditures equal GDP, then... A = Consumption equals investment B = Planned investment equals to saving. C = Disposable income equals consumption minus saving D = Consumption equals aggregate expenditures.
*December 14, 2008*

**Physics**

John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass ...
*December 10, 2008*

**Chem**

will Ne or Xe have a higher boiling point? why?
*December 2, 2008*

**calculus**

a box with no top is to be built by taking a 12''-by-16'' sheet of cardboard and cutting x-inch squares our of each corner and folding up the sides. find the value of x that maximizes the volume of the box
*November 25, 2008*

**Chemistry**

What does fluoride ion have in common with a neon atom and a sodium ion?
*November 21, 2008*

**Chemistry**

h h h h | | | | h---c--C====c---c---h | | | | h h h h This is 2-butene where do I insert the HI for hydroiodic aci?
*November 19, 2008*

**Chemistry**

What would be the whole name of 2-butene and hydroiodic acid. Or the diagram. h h Any help would be greatly appreciated.
*November 19, 2008*

**Chemistry**

What is another name or diagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.
*November 19, 2008*

**Chemistry**

What is another name ordiagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.
*November 18, 2008*

**physics**

Determine the tangential speed of a point .4 m from the center of the wheel?
*November 17, 2008*

**Chemistry**

You have the alkane C7H16. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

You have the alkane C7H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

You have the alkane C6H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

Two people were given 1.75 g salicylic acid and 2.00 mL of acetic anhydride. If the density of acetic anhydride is 1.0820 g/mL, how many grams of aspirin could they have prepared. Is the answer 4.7 g
*November 14, 2008*

**Calculus**

What is the local linearization of e^x^2 near x=1? Is the answer 1+2x
*November 14, 2008*

**Calculus**

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5 miles and is going 500 ...
*November 12, 2008*

**Calculus**

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another 5 miles and is going 500 mph. At that moment, how fast is the distance between the ...
*November 11, 2008*

**Hard Calculus**

Is the answer then -4 x 10^-13
*November 9, 2008*

**Hard Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing ...
*November 9, 2008*

**Hard Calculus**

Is the answer for part B -1C
*November 9, 2008*

**Hard Calculus**

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
*November 9, 2008*

**Math Word Problem**

At 6am a few bacteria fall into a can of syrup in a broken garbage bag. The conditions of warmth, moisture, and food are perfect for growth and the population doubles every 20 minutes. By 6pm the bacteria are overcrowded and dry and their food is gone.At what time does the ...
*November 9, 2008*

**Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing ...
*November 9, 2008*

**Calculus**

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
*November 9, 2008*

**Calculus**

(A) Find the equations of the tangent lines to the circle x^2 +y^2=25 at the points where x=4. (B) Find the equations of the normal lines to this circle at the same points. (The normal line is perpendicular to the tangent line at that point.) (C) At what point do the two ...
*November 7, 2008*

**Calculus**

(a) Find dy/dx given that x^2+y^2-4x+7y=15. (b) Under what conditions on x and/or y is the tangent line to this curve horizontal? Vertical? For part A, I simplifid it to -(2x+4/2y+7) For part B,I am confused on what to do?
*November 7, 2008*

**Implicit Functions**

Find the slope of the tangent to the curve at the point specified. x^3+5x^2y+2y^2=4y+11 at (1,2) So far I simplified it to -(3x^2-10y/5x^2+4y-4) which I think then simplifies to -(8/3). What do I do from here....?
*November 7, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Find dy/dx of the function 10x^2+4y^2=sqrt(7). Is the answer 20x+8y=0
*November 5, 2008*

**Derivatives**

Find dy/dx for the function, xy-x-12y-3=0. Is the answer -14,I got this from 1-1-12=0, which solves to -14.
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

(a) Find the tangent line approximation for sqrt(9+x) near x=0. (b)Find a formula for the error, E(x),in the tangent line approximation found in part (a). For part A, is the answer y=3. For part b, I don't understand , any help would be greatly appreciated.
*November 5, 2008*

**Calculus**

Find the derivative of 10x^2+4y^2=sqrt(7). Is the answer 20x+8y=0
*November 5, 2008*

**Calculus**

Find the derivative of the function, xy-x-12y-3=0. Is the answer -14,I got this from 1-1-12=0, which solves to -14.
*November 5, 2008*

**Calculus**

According to the US Census, the world population P, in billions, is approximately P=6.342e^(0.011t); where t is in years since January 1, 2004. At what rate was the world's population increasing on January 1, 2005? Give your answer in millions per year. Is the answer 6412 ...
*November 5, 2008*

**Engineering/Algebra**

A cardboard tube has a failure stress of 4,960,000 N/m^2 and an axial stress of 75 N/cm^2, find the factor of safety of the tube. Is the answer 66133.33
*November 4, 2008*

**Engineering/Algebra**

A cardboard tube is loaded with a 15.3 N axial load. The tube has an outside diameter of 2.5 cm and a wall thickness of .035 cm. Find the axial stress in the cardboard tube. Is the answer 75 N/cm^2? If so can you show me your way of getting to this answer.
*November 4, 2008*

**Engineering/Algebra**

A balsa wood glider wing has the following properties during flight: Thickness= 0.3175 cm I= 0.0733 cm^4 Moment= 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer either 9.096 N/m^2 or 18.192 N/m^2
*November 4, 2008*

**Engineering/ Algebra**

A balsa wood glider wing has the following properties during flight: Thickness= 0.3175 cm I= 0.0733 cm^4 Moment= 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer either 9.096 N/m^2 or 18.192 N/m^2
*November 4, 2008*

**Engineering/ Algebra**

A balsa wood glider wing has the following properties during flight: Thickness = 0.3175 cm I = 0.0733 cm^4 Moment = 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer 9.09 N/m^2 or 18.19 N/m^2
*November 4, 2008*

**math**

what percent is 23 students out of 51 students and how do you solve it
*October 30, 2008*

**Algebra**

keep it clean here.
*October 29, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Would this be a good explanation? The process of global optimization refers to ...
*October 27, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Does this have to do with the first derivative rule or second derivative rule ...
*October 27, 2008*

**Calculus**

A rectangular beam is cut from a cylindrical log of radius 30 cm. The strength of a beam of width w and height h is proportional to wh^2. Find the width and height of the beam of maximum strength. Is the width 45 and the height 20.
*October 26, 2008*

**Calculus**

A rectangular swimming pool is to be built with an area of 1800 square feet. The owner wants 5-foot wide decks along either side and 10-foot wide decks at the two ends. Find the dimensions of the smallest piece of property on which the pool can be built satisfying these ...
*October 25, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Does this have to do with the first derivative rule or second derivative rule ...
*October 25, 2008*

**Calculus (Global Max)**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Does this have to do with the first derivative rule or second derivative rule ...
*October 25, 2008*

**Calculus**

The hypotenuse of a right triangle has one end at the origin and one end on the curve y=x^(7)e^(-7x) , with x greater than or equal to 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a triangle. Round your...
*October 21, 2008*

**Calculus**

Find a forula for the following function. A line with slope 5 and x-intercept 10 is the answer y(x)= 5x-50
*October 16, 2008*

**Calculus**

Find a formula for the following function. A parabola opening downward with its vertex at (6,1) and y -intercept equal to -35. (y-1)^2=4(-35)(x-6) Please help
*October 16, 2008*

**Algebra**

Find a forula for the following function. A line with slope 5 and x-intercept 10 is the answer y(x)= 5x-50
*October 16, 2008*

**Calculus**

Use analytical methods to find the exact global maximum and minimum values of the function f(x)=8x-ln(4x) for x >0. If a global maximum or minimum does not exist, enter the word NONE. For the global maximum at x=none, But for the Global minimum at x=? Is the Global minimum ...
*October 16, 2008*

**SCIENCE**

WATS THE REACTION BETWEEN IRON AND SULPER AND WATS THE ENERGY BETWEEN THEM
*October 9, 2008*

**math**

Is anyone familar with Sharon Wells Math? How do you solve a word problem using their program?
*October 6, 2008*

**Social Studies**

Rain can collect easily in a dried out waterbed called a _____________
*September 30, 2008*

**Calculus**

f(x)=x^3(x^(4)-8) Find f '(x) by multiplying out before taking the derivative Is the answer x^12+-8+x^12-8x^3 simplified to 2x^12-8x^3+-16
*September 30, 2008*

**Chemistry**

Alexander, who weighs 159lbs , decides to climb Mt. Krumpett, which is 5460ft high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100g bar contains 10g of fat, 40g of protein, and 50g of carbohydrates.Alexander wants to know ...
*September 29, 2008*

**Chemisrty**

I am getting 22.6, but it says that is the wrong answer. 450*2000*4.18=3762000 159*5460*9.8=8507772 I am setting them equal to eachother and getting 2.26, but it says the answer is wrong. Please help.
*September 29, 2008*

**Chemisrty**

Alexander, who weighs 159lbs , decides to climb Mt. Krumpett, which is 5460ft high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100g bar contains 10g of fat, 40g of protein, and 50g of carbohydrates.Alexander wants to know ...
*September 29, 2008*

**Chemistry**

Alexander, who weighs 159 , decides to climb Mt. Krumpett, which is 5460 high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- bar contains 10 of fat, 40 of protein, and 50 of carbohydrates.Alexander wants to know exactly how...
*September 27, 2008*

**Chemisty**

Is it 450 calories I don't know what you mean by 2mgh
*September 27, 2008*

**Chemisty**

Alexander, who weighs 159 , decides to climb Mt. Krumpett, which is 5460 high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- bar contains 10 of fat, 40 of protein, and 50 of carbohydrates.Alexander wants to know exactly how...
*September 27, 2008*

**Calculus**

Find the derivative. g(x)=cos(x^6) Isn't the answer -6xsin(x^6)
*September 27, 2008*

**Calculus**

Find the derivative of the given function w=((t^3)+8)^103 Isnt the answer 309t((t^3)+8)^102
*September 27, 2008*

**Chemistry**

If 560.70 g of water (22degrees) is displaced, what volume of gas displaced it? Any help would be greatly appreciated. I am thinking about using PV=NRT, but do I assume the value of the pressure is 1. Also using 560.7 do i determine the amount of moles?
*September 26, 2008*

**Chemistry**

A gaseous mixture of and contains 30.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 505mmHG ? I am getting .41 * (505/750)= .27 .27 is my answer, is this right.
*September 26, 2008*

**Chemistry**

Which metal would you expect to generate more gas when exposed to a weakly acidic solution, K or Ca? I say K because it only needs to lose one electron. Is this true?
*September 24, 2008*

**Calculus**

At STP, 1.00 g of calcium is placed into an acidic solution, and 407 mL of hydrogen gas is collected. What is the ratio of moles of calcium consumed to moles of hydrogen produced? a)1.37:1.00 b)1.00:1.64 c)0.928:1.00 d) 0.500:1.00 Is the answer A, if so, can you explain the ...
*September 22, 2008*

**Chemistry**

Butane,C4H10 , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00atm and 23 degrees Celsius , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o Any help would be greatly appreciated
*September 21, 2008*

**Chemistry**

Butane, , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00 and 23 , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o
*September 21, 2008*

**Chemistry**

Imagine that you have a 7.00 gas tank and a 3.00 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145 , to what pressure should you fill the ...
*September 21, 2008*

**Calculus**

For each value of h, evaluate the following function. Round your answer to four decimal places. lim h->0 (4+h)^(3)-64/h A) h=0.01 B) h=0.001 C) h=0.0001 D) h=-0.01 E) h=-0.001 F) h=-0.0001 For A I got 48.9 For B I got 48.99 For C I got 48.999 For D I got 47.9 For E I got 47...
*September 21, 2008*

**Calculus**

For each value of h, evaluate the following function. Round your answer to four decimal places. lim h->0 (4+3)^(3)-64/h A) h=0.01 B) h=0.001 C) h=0.0001 D) h=-0.01 E) h=-0.001 F) h=-0.0001 For A I got 48.9 For B I got 48.99 For C I got 48.999 For D I got 47.9 For E I got ...
*September 21, 2008*

**Calculus**

I am given the function P=9e^(-0.9t) In the funcion form P=(P initial)(a^t) what are the values of P initial and a P initial is 9 what is a?
*September 21, 2008*

**CHemistry**

Butane, , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00 and 23 , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane?
*September 21, 2008*

**Chemistry**

When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas. How many grams of calcium carbonate are needed to produce 81.0 of carbon dioxide at STP? Is the asnwer 80.95
*September 21, 2008*

**Chemistry**

Imagine that you have a 7.00 gas tank and a 3.00 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145 , to what pressure should you fill the ...
*September 21, 2008*

**Chemistry**

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures Would the answer be 0.38 mol?
*September 18, 2008*

**Chemistry**

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures Would the answer be 0.38 mol?
*September 17, 2008*