Questions and answers by

COFFEE

Questions (127)

[Given]Fiber Linear Density = 1 denier = 1 g/9000m Fiber Density = 1.14 g/cm^3 [Find..] Fiber surface area in cm^2/g Assume that
1. 2 answers
2. 1,365 views
using power series, integrate & evaluate to 4 dec. placesintegral from 0 to 1: sin x^2 dx i'm REALLY stuck on this. and i need
1. 0 answers
2. 746 views
infinity of the summation n=0: ((n+2)/(10^n))*((x-5)^n).. my work so far. i used the ratio test = lim (n-->infinity) |
1. 0 answers
2. 530 views
infinity of the summation n=1: (e^n)/(n!) [using the ratio test]my work so far: = lim (n->infinity) | [(e^n+1)/((n+1)!)] /
1. 0 answers
2. 653 views
can you please find the first 5 derivatives for:f(x) = (0.5e^x)-(0.5e^-x) f'(x) = ? f''(x) = ? f'''(x) = ? f''''(x) = ?
1. 0 answers
2. 527 views
infinity of the summation n=0: ((n+2)/(10^n))*((x-5)^n).. my work so far. i used the ratio test = lim (n-->infinity) |
1. 1 answer
2. 619 views
Posted by COFFEE on Sunday, July 29, 2007 at 6:32pm.infinity of the summation n=1: (e^n)/(n!) [using the ratio test] my work so
1. 0 answers
2. 1,066 views
infinity of the summation n=1: (e^n)/(n!) [using the ratio test]my work so far: = lim (n->infinity) | [(e^n+1)/((n+1)!)] /
1. 0 answers
2. 1,117 views
Find the Taylor series for f(x) centered at the given value of 'a'. (Assume that 'f' has a power series expansion. Do not show
1. 1 answer
2. 1,230 views
could you please help me with solving this problem?#1) Find the Taylor polynomial Tn(x) for the function 'f' at the number 'a'.
1. 0 answers
2. 821 views
I'm getting this answer wrong, can someone please help show me what i'm missing?? thank you :)Infinity of the summation n=0:
1. 0 answers
2. 461 views
i'm a bit stuck with this..145/18 = x + x^2 what does x equal to? multiply each term by 18, then re-arrange to get 18x^2 + 18x -
1. 0 answers
2. 652 views
Please check my work below and comment.A tank initially contains 80 gallons of fresh water. A 10% acid solution flows into the
1. 0 answers
2. 612 views
I am given a damping constant of 20 dyne*sec/meter...do I need to convert this if the rest of my givens are, for mass = 2kg, k
1. 0 answers
2. 609 views
Please check my work and correct any errors/point out any errors. Thanks.Solve the initial-value problem using the method of
1. 0 answers
2. 675 views
A series circuit contains a resistor with R = 24 ohms, an inductor with L = 2 H, a capacitor with C = 0.005 F, and a generator
1. 1 answer
2. 951 views
Solve the initial-value problem.Am I using the wrong value for beta here, 2sqrt(2) or am I making a mistake somewhere else?
1. 0 answers
2. 661 views
Please take a look at my work below and provide a good critique:Solve the differential equation using the method of undetermined
1. 0 answers
2. 630 views
A spring with a 4 kg mass has natural length 1 m and is maintained stretched to a length of 1.3 m by a force of 24.3 N. If the
1. 3 answers
2. 2,771 views
A series circuit contains a resistor with R = 24 , an inductor with L = 2 H, a capacitor with C = 0.005 F, and a generator
1. 0 answers
2. 1,019 views
Please look at my work below:Solve the initial-value problem. y'' + 4y' + 6y = 0 , y(0) = 2 , y'(0) = 4 r^2+4r+6=0, r=(16 +/-
1. 0 answers
2. 867 views
Solve the initial-value problem.y'' - 2y' + y = 0 , y(2) = 0 , y'(2) = 1 r^2-2r+1=0, r1=r2=1 y(x)=c1*e^x+c2*x*e^x
1. 0 answers
2. 551 views
Posted by COFFEE on Monday, July 9, 2007 at 9:10pm.download mp3 free instrumental remix Solve the initial-value problem. y'' +
1. 0 answers
2. 697 views
Solve the initial-value problem.y'' + 4y' + 6y = 0 , y(0) = 2 , y'(0) = 4 r^2+4r+6=0, r=(16 +/- Sqrt(4^2-4(1)(6)))/2(1) r=(16
1. 0 answers
2. 833 views
Solve the boundary-value problem.y''+5y'-6y=0, y(0)=0, y(2)=1 r^2+5r-6=0, r1=1, r2=-6 y=c1*e^x + c2*e^-6x y(x)=c1*e^x+c2*e^-6x
1. 0 answers
2. 480 views
Given the differential equation:dy/dx = y(1+x), y(0)=1, Use Euler's method with step size .1 to approximate y(.3). ... please
1. 0 answers
2. 887 views
Find the average value of the function "f(x) = x^2 sqrt(1+x^3)" on the interval [0,2].and this is what i did.. please check for
1. 0 answers
2. 2,306 views
Find the length of the curve y=(1/(x^2)) from ( 1, 1 ) to ( 2, 1/4 ) [set up the problem only, don't integrate/evaluate]this is
1. 0 answers
2. 720 views
Given the differential equation:dy/dx = y(1+x), y(0)=1, Use Euler's method with step size .1 to approximate y(.3). y' = y(1+x),
1. 0 answers
2. 558 views
Find the average value of the function "f(x) = x^2 sqrt(1+x^3)" on the interval [0,2].and this is what i did.. please check for
1. 0 answers
2. 1,143 views
A force of 27N is required to maintain a spring stretched from its natural length of 12cm to a length of 15cm. How much work is
1. 1 answer
2. 1,322 views
Given the differential equation:dy/dx = y(1+x), y(0)=1, Use Euler's method with step size .1 to approximate y(.3). y' = y(1+x),
1. 0 answers
2. 416 views
Please check my work:Find the hydrostatic pressure on one end of a water trough full of water, the end of which is a trapezoid
1. 2 answers
2. 1,140 views
Solve the separable differential equation (dy/dx)=y(1+x) for y and find the exact value for y(.3).dy/dx = y(1+x) dy/y = (1+x)dx
1. 0 answers
2. 735 views
Given the differential equation:dy/dx = y(1+x), y(0)=1, Use Euler's method with step size .1 to approximate y(.3). y' = y(1+x),
1. 0 answers
2. 560 views
Find the orthogonal trajectories of the family of curves:y = k*(e^-x) --------------- so k = y/(e^-x) differentiating we get: 1
1. 0 answers
2. 708 views
Find the exact coordinates of the centroid given the curves: y = 1/x, y = 0, x = 1, x = 2.X = 1/Area*Integral from a to b:
1. 0 answers
2. 1,341 views
Solve the differential equation. Let C represent an arbitrary constant. (Note: In this case, your answer willto have a negative
1. 0 answers
2. 733 views
The tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank.
1. 1 answer
2. 2,470 views
The tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank.
1. 0 answers
2. 1,000 views
Use Euler's method with step size 0.2 to estimate y(1.4), where y(x) is the solution of the initial-value problem below. Give
1. 2 answers
2. 5,262 views
Find the exact coordinates of the centroid. y = sqrt[x], y = 0, x = 9.-------------- Is this basically 1/4 of an oval/ellipse?
1. 0 answers
2. 559 views
Use Euler's method with step size 0.2 to estimate y(1), where y(x) is the solution of the initial-value problem below. Give your
1. 1 answer
2. 3,790 views
Find the exact coordinates of the centroid. y = sqrt[x], y = 0, x = 9.-------------- Is this basically 1/4 of an oval/ellipse?
1. 0 answers
2. 1,171 views
The hemispherical tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out
1. 1 answer
2. 1,447 views
Find the exact coordinates of the centroid. y = sqrt[x], y = 0, x = 9.-------------- Is this basically 1/4 of an oval/ellipse?
1. 1 answer
2. 1,751 views
The hemispherical tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out
1. 1 answer
2. 1,649 views
A steady wind blows a kite due west. The kite's height above ground from horizontal position x = 0 to x = 80 ft is given by the
1. 1 answer
2. 1,422 views
A steady wind blows a kite due west. The kite's height above ground from horizontal position x = 0 to x = 80 ft is given by the
1. 1 answer
2. 1,464 views
A steady wind blows a kite due west. The kite's height above ground from horizontal position x = 0 to x = 80 ft is given by the
1. 1 answer
2. 892 views
Graph the curve and find its exact length.x = e^t + e^-t, y = 5 - 2t, from 0 to 3 Length = Integral from 0 to 3 of:
1. 1 answer
2. 1,390 views
i'm still getting this question wrong. please check for my errors:Use Simpson's Rule with n = 10 to estimate the arc length of
1. 1 answer
2. 843 views
Posted by COFFEE on Monday, June 11, 2007 at 11:48pm.find the exact length of this curve: y = ( x^3/6 ) + ( 1/2x ) 1/2 <or= x
1. 0 answers
2. 540 views
find the exact length of this curve:y = ( x^3/6 ) + ( 1/2x ) 1/2 <or= x <or= 1 im looking over my notes, but i'm getting stuck.
1. 0 answers
2. 1,057 views
Consider a cooling cup of coffee whose initial temperature is 205°. The room temperature is held at 70°. Suppose k = 1/16. Let
1. 0 answers
2. 753 views
How would I integrate the following:(2x^2 + 5)/((x^2+1)(x^2+4))dx I think I would start with making it a sum of two partial
1. 0 answers
2. 386 views
How would I integrate the following by parts:Integral of: (x^2)(sin (ax))dx, where a is any constant. Just like you did x^2
1. 0 answers
2. 698 views
How would I evaluate the following integral by using integration by parts?Integral of: (t^3)(e^x)? You mean (x^3)(e^x)? x^3
1. 0 answers
2. 615 views
How would I solve the following integral with the substitution rule?Integral of: [(x^3)*(1-x^4)^5]dx Put 1-x^4 = y Then -4x^3 dx
1. 1 answer
2. 572 views
Integrate: 1/(x-sqrt(x+2) dxI came up with: (2/3)(2*ln((sqrt(x+2))-2)+ln((sqrt(x+2))-1)) but it keeps coming back the wrong
1. 0 answers
2. 559 views
Integrate: (2x^2+5)/((x^2+1)(x^2+4))I came up with: (tan^-1)(x)-(1/2)((tan^-1)(2/x)) but it keeps coming back the wrong answer
1. 0 answers
2. 485 views
Two identical tuning forks can oscillate at 329.6 Hz. A person is located somewhere on the line between them. The speed of sound
1. 0 answers
2. 1,181 views
For two sounds whose sound levels differ by 69 dB, find the ratios (greater value / smaller value) of the following values.(a)
1. 0 answers
2. 654 views
The source of a sound wave has a power of 2.50 µW. Assume it is a point source.(a) What is the intensity 6.70 m away? I used I
1. 0 answers
2. 1,004 views
Two sinusoidal waves, identical except for phase, travel in the same direction along a string producing a net wave y'(x, t) =
1. 0 answers
2. 1,628 views
Calculate the speed of the pulse from the following:y(x,t) = 2/((x - 3t)^2 + 1) Well the speed of the pulse is given by: y(x,t)
1. 0 answers
2. 581 views
Two sinusoidal waves with identical wavelengths and amplitudes travel in opposite directions along a string with a speed of 11
1. 0 answers
2. 2,158 views
The angle of the pendulum is given by θ = θmcos(ωt + φ), where ω = 3.24 rad/s. If at t = 0, θ = 1 rad and dθ/dt = -0.9
1. 0 answers
2. 417 views
A performer, seated on a trapeze, is swinging back and forth with a period of 9.55 s. If she stands up, thus raising the center
1. 0 answers
2. 850 views
A uniform circular disk whose radius R is 32.0 cm is suspended as a physical pendulum from a point on its rim.(a) What is its
1. 2 answers
2. 775 views
An oscillating block-spring system has a mechanical energy of 1.00 J, an amplitude of 11.2 cm, and a maximum speed of 1.08 m/s.(
1. 0 answers
2. 779 views
An object rotates about a fixed axis, and th angular position of a reference line on the object is given by THETA(t)=0.4e^2t,
1. 0 answers
2. 1,007 views
a man is standing on the center of a platform that is rotating without friction. his arms are outstretched holding a brick in
1. 0 answers
2. 770 views
When the angular momentum changes, the 'change' in the angular momentum vector (ie. dL) is ____.[a.] perpendicular to the torque
1. 0 answers
2. 559 views
Figure A [[which i tried to recreate below]] is a partial graph of the position function x(t) for a simple harmonic oscillator
1. 0 answers
2. 582 views
..im really stuck on this. can someone please explain?------- Figure A [[which i tried to recreate below]] is a partial graph of
1. 0 answers
2. 594 views
An automobile can be considered to be mounted on four identical springs as far as vertical oscillations are concerned. The
1. 0 answers
2. 706 views
A particle is acted on by two torques about the origin: T1 has a magnitude of 4.3 N*m and is directed in the positive direction
1. 0 answers
2. 802 views
A particle is acted on by two torques about the origin: T1 has a magnitude of 4.3 N*m and is directed in the positive direction
1. 0 answers
2. 783 views
Posted by COFFEE on Friday, March 30, 2007 at 4:25am.A 1.1 kg particle-like object moves in a plane with velocity components Vx
1. 2 answers
2. 899 views
Posted by COFFEE on Friday, March 30, 2007 at 4:16am.A sanding disk with rotational inertia 1.1 x 10^-3 kg*m^2 is attached to an
1. 1 answer
2. 515 views
A 1.1 kg particle-like object moves in a plane with velocity components Vx = 30 m/s and Vy = 90 m/s as it passes through the
1. 0 answers
2. 638 views
A sanding disk with rotational inertia 1.1 x 10^-3 kg*m^2 is attached to an electric drill whose motor delivers a torque of 6 Nm
1. 0 answers
2. 666 views
In Figure 11-32 (which shows a ball at the top of an incline, at the bottom of the incline a loop begins with radius R and Q a
1. 0 answers
2. 688 views
In Figure 11-32 (which shows a ball at the top of an incline, at the bottom of the incline a loop begins with radius R and Q a
1. 0 answers
2. 1,013 views
The rigid body shown in Figure 10-66 (it is a triangle with the upper mass = to M and the bottom two corners/masses equal to 2M.
1. 0 answers
2. 2,397 views
The rigid body shown in Figure 10-66 (it is a triangle with the upper mass = to M and the bottom two corners/masses equal to 2M.
1. 0 answers
2. 559 views
In Figure 11-32 (which shows a ball at the top of an incline, at the bottom of the incline a loop begins with radius R and Q a
1. 0 answers
2. 868 views
The rigid body shown in Figure 10-66 (it is a triangle with the upper mass = to M and the bottom two corners/masses equal to 2M.
1. 1 answer
2. 724 views
"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a
1. 0 answers
2. 2,562 views
A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of
1. 1 answer
2. 750 views
A stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction,
1. 0 answers
2. 621 views
"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a
1. 0 answers
2. 711 views
A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of
1. 0 answers
2. 561 views
A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of
1. 1 answer
2. 1,906 views
A stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction,
1. 0 answers
2. 2,231 views
"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a
1. 0 answers
2. 710 views
"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a
1. 0 answers
2. 939 views
A stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction,
1. 0 answers
2. 851 views
A vessel at rest at the origin of an xy coordinate system explodes into three pieces. Just after the explosion, one piece, of
1. 0 answers
2. 1,046 views