Thursday
October 23, 2014

Posts by damon


Total # Posts: 19,016

Math 12
The main reason for giving appreciated stock to a charity is to avoid paying any capital gains tax on the stock. but anyway paid 100 * 10 = 1,000 for stock it was worth 100 N when granted got a refund of .6(100 N) = 60 N paid tax = .2(100 N - 1,000) so 60 N - (20 N - 200) = 1...
October 23, 2014

ap calc
oh, the first one is always v positive v = 2t+2 so when does the second one go - ?
October 23, 2014

ap calc more on d
they both start out + find out when the first one hits v = 0 then it goes - while the first is + find when the second hits v=0 then they both are - etc
October 23, 2014

ap calc
b) find the velocity of each when t = 8 v1 = 2(8)+2 = + 18 v2 = -2t +8 = -8 so in opposite directions d ) they start out both moving + when is v1-v2 = 0 ?
October 23, 2014

Algebra
slope = -1/5 y = -(1/5)x + b -1 = -3/5 + b b = -2/5 so y = -(1/5)x -2/5 or 5 y = -x -2
October 22, 2014

PHYSICS
I initial = 4.90 + .565^2 (4.95*2) = 4.90 + .319 (9.9) = 4.90 + 3.16 = 8.06 Ifinal = 4.90 + .2^2(9.9) = 4.90 + .396 = 5.30 oh my, much less angular momentum initial and final = I omega1 = 8.06*2.8 = 22.6 (answer A) = 5.3*omega2 so omega 2 = 22.6/5.3 = 4.26 rad/s Now I think ...
October 22, 2014

physics Damon???
(i) half (it arrives randomly polarized. The first filter takes out all the x components for example) (ii) None. The x components go out with the first filter. The second filter takes out the y components :) (iii)http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/polcross.html ...
October 22, 2014

Algebra 2
Assuming you are not allowed to use calculus, complete the square to find the vertex. x^2 + 12 x = y-5 x^2 + 12 x + 6^2 = y - 5 + 6^2 (x+6)^2 = y + 31 vertex at x = -6, y = -31 so never smaller than -31
October 22, 2014

physics
You are welcome.
October 22, 2014

physics
it would have to be 8 times as thick 64 cm (pretty thick :)
October 22, 2014

science
http://curious.astro.cornell.edu/question.php?number=300 Note that if you are in the Northern hemisphere You can see stars that are high in the northern sky all year. It is the ones close to the plane of the earth's orbit that you can only see when you are facing them at ...
October 22, 2014

Sorry
mistook / for times (bottom*derivative of top - top * derivative of bottom)/bottom^2 (x)/(2+x)= = [(x+2)(1)-x(1) /(x+2)^2 = [ x+2 -x ] /(x+2)2 = 2/(x+2)^2
October 22, 2014

Derivatives
(2+x) d/dx (x) + x d/dx (2+x) (2 + x) + x(1) 2 + 2 x 2(x+1)
October 22, 2014

physics
6.3 * sin 34 = 3.52 meters up m g h = 13.2 * 9.81 * 3.52 = 456 so I get -456 J I think you reversed digits
October 22, 2014

physics...damon please help
delta L/L = k delta T delta L/L = 6.7*10^-6 inches/inch degree F (117 deg F) L = 10 meters =394 inches so delta L = 394 * 6.7 *10^-6 * 117 = .309 inches = .784 cm = .0784 meters
October 22, 2014

COLLEGE PHYSICS
|v1| = 2|v2| v1^2 = 4 v2^2 so Ke v1 = 4 Ke v2 so 5 Ke2 = 7500 J so Ke2 = 1500 J and Ke1 = 6000 J
October 22, 2014

Trig ?
I do not understand your symbols, do not have whatever font you are using. I assume this is some kind of a phase shift in the argument of the cotangent.
October 22, 2014

physics
17 = (1/2) 1.9 t^2 solve for t v = 1.9 t
October 22, 2014

Math
II. When calculating interest , you need too ______? (1pt) a. Change the percentage to a decimal then multiply the decimal against the amount. --------------------------------- VIII .0450 - .0375 = .0075 .0075 * 1000 = 7.50 or answer c BUT this assumes interest PER MONTH (very...
October 22, 2014

Algebra 1 ?????
do you mean -2/5x - 9 < 9/10 ??? or (-2/5)(x - 9) < 9/10 or -2/(5x - 9 )< 9/10 or -2/[5(x - 9)] < 9/10 or what ?
October 22, 2014

math
You mean he checked 25 wheels ????? If so then what times 4 + what times 3 = 25? 1*4 + 21 sure 1*4 + 7*3 2*4 + 17 nope 3*4 + 13 nope 4*4 + 9 sure 4*4 + 3*3 4*5 + 5 nope 4*6 + 1 nope
October 21, 2014

math
1.65 * 100 = 165
October 21, 2014

Precalculus
PLEASE PROOF READ - I assume you mean 2.2ft. / HOUR a) A = pi r^2 b) 2.2 t c) 2.2 * 2 2.2 * 2.5 d)A(2) = pi * (4.4)*2 A(2.5) = pi (5.5)^2 e) A(t) = pi (2.2 t)^2 f) A(2) = pi (2.2*2)^2 A(2.5) = pi (2.2*2.5)^2 g) [ A(2.5) -A(2) ]/.5 h) [A(7.)-A(5)]/ 2.5 i) you will see that it ...
October 21, 2014

precalculus
A = Ai e^kt 2 = e^3k 3 k = ln 2 k = .231 30 = e^(.231 t) ln 30 = .231 t t = 14.7 hours
October 21, 2014

precalculus
already did this above
October 21, 2014

algebra
note a may not be 10 or -4 or the problem is undefined (zero denominator)
October 21, 2014

algebra
(a+10)/(a+4) by dividing top and bottom by (a-10)
October 21, 2014

Physics
4.63 * 4.10 work "in" in x direction -3.79 * 3.86 work "out" in y direction (braking) 2.16 * -2.45 work "out" in z direction now just add the results (not a vector) 4.63 * 4.10 - 3.79 * 3.86 - 2.16 * 2.45 Joules (scalar but does have sign)
October 21, 2014

math
Oh, I misunderstood question I think.
October 21, 2014

math
72 min and 75 min (common multiple?) 72 = 12 * 6 = 3*3 *2*2*2 75 = 5*5*3 so we need 25 * 3 * 8 = 600 minutes = 10 hours
October 21, 2014

Physics
just did it below kinetic energy at bottom = potential energy at top
October 21, 2014

Physics
m g h = (1/2) m v^2 v^2 = 2 g h v = sqrt (2 g h) h = 3.27 (1 - cos 35.6) meters g = 9.8 m/s^2
October 21, 2014

Physics
work done by gravity = change in potential energy in falling from initial height h = L (1-cos theta) h = .8 (1 - cos 40.4) so work=m g h = 2.63*9.8*.8 (1 - cos 40.4)
October 21, 2014

Physics
2275 = 207.8 t +(1/2)15.6 t^2 solve quadratic for t then v = 207.8 + 15.6 t
October 21, 2014

Physics
d = Vo t + (1/2) a t^2 219 = 0 + 2.3 t^2 solve for t v = Vo + a t v = 0 + 4.6 t
October 21, 2014

Physics
here for example Vo = 14.8 a = 11.3 ft/s^2 t = 6.6 sd v = Vo + a t so v = 14.8 + 11.3 * 6.6 = 89.4 feet/second
October 21, 2014

Physics
http://hyperphysics.phy-astr.gsu.edu/hbase/mot.html You want the box labeled: "Description of motion in one dimension"
October 21, 2014

inequalities
10x -20 + 11 < 10 -12 + 2x 8 x < 7 x < 7/8
October 21, 2014

Note
0 = Vo - a t ignore that line, final speed is not zero and is not needed
October 21, 2014

please help! physics
95 km/hr *1000/3600 = 26.4 m/s in .5 seconds moves 13.2 meters then a = F/m = -2400/1200 = - 2 m/s^2 0 = Vo - a t d = 13.2 + 26.4 t - (1/2) (2) t^2 t = 2 so d = 13.2 + 48.8 = 62 meters d = 13.2 +
October 21, 2014

Physics
at bottom v = sqrt (2 g h)
October 21, 2014

science
They are all gasses but the most dense of the bunch is ethyne (Acetylene)
October 21, 2014

physic
Vi = 28 sin 60 =24.25 m/s v = Vi - 9.8 t h = Vi t - 4.9 t^2 = 24.25(3.3) - 4.9(3.3)^2 = 26.7 meters high not 29.2 when does v = 0 (top of arc)? 0 = 24.25 - 9.8 t t = 2.47 seconds so h at top = 24.25(2.47) - 4.9 (2.47)^2
October 21, 2014

Physics
m v^2/r = 1630 * (13.9)^2/385 b) I do not know what is holding your vehicle in the circle !!!! If on a string - tension force If held in a big cylinderical rotating can (carnival ride) - normal force If on a flat curving road - friction on the tires If in orbit in space - ...
October 21, 2014

math
I (we) did not use any resources such as the web or books other than our textbook. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; and you want me to work on it ?
October 19, 2014

Physics
Total momentum = 0 Mb*2.2 - Me*2.9 = 0 Mb/Me = +2.9/2.2 the ratio of masses is unlikely to be negative and I think you have it upside down.
October 19, 2014

Physics!
force = rate of change of momentum (only m a if m is constant :) change of momentum = 79.1 (0 - -6.27) change of time = 2.06*10^-3 s so force = + 6.27*79.1 / .00206 Newtons
October 19, 2014

Calculus
You are welcome.
October 19, 2014

Calculus
In other words you got the slope right but did not get b right in y = m x + b
October 19, 2014

Calculus
you say y = 5 x + 2.5 then if x = pi/4, y = 5 pi/4 + 2.5 You say but what is f(x) at x = pi/4 ??? sin^2 = 1/2 2 tan = 2 so f(x) = 2.5 You better take 5 pi/4 off your answer
October 19, 2014

Physics
Keb = (1/2)55 (7.5^2) = 1545 J = 1.55kJ I agree with your book :)
October 19, 2014

Physics
55*22 = 1210 = 55 Vb cos 76+ 45 Vs cos 12 45*26 = 1260 = 55 Vb sin 76 - 45 Vs sin 12 1210 = 13.3 Vb + 44.0 Vs 1260 = 53.4 Vb - 9.36 Vs times 44/9.36 1210 = 13.3 Vb + 44.0 Vs 5922 = 251 Vb - 44.0 Vs ------------------------- 7132 = 264.3 Vb Vb = 27 km/hr = 7.5 m/s humm, we ...
October 19, 2014

physics
force in = mg sin 12 = m v^2/r v^2/r = g sin 12 turns 180 deg = pi radians r = v^2/(g sin 12) pi r = distance flown = pi v^2/(g sin 12) time = distance / speed = pi r/v = pi v/(g sin 12 here v = 450/3.6 and g = 9.81
October 19, 2014

physics
m = 5 t^.8 - 3 t + 20 dm/dt = (5*.8) t^-.2 - 3 so at max or min 0 = 4/T^.2 - 3 T^.2 = 4/3 = 1.333 .2 log T = log 1.333 Log T = .6246 T = 10^.6246 = 4.21 seconds find m at t = 4.21 and find dm/dt at 3 and 5 (signs better be different)
October 19, 2014

Math
You are welcome.
October 18, 2014

Math
A + B = 500,000 .14 A + .10 B = 59,000 multiply second equation by 10 1.0 A + B = 500,000 1.4 A + B = 590,000 --------------------- subtract -.4 A = -90,000 A = 225,000 etc
October 18, 2014

Math
A + B = 260,000 A = B + 77,000 so B + 77,000 + B = 260,000 or 2 B = 183,000 etc
October 18, 2014

Math
Yes, it is a quadratic equation
October 18, 2014

Math
been there, done that see below
October 18, 2014

math
LOL, well if 6 is the answer then -16(36) + 96 (6) better be zero is it ? :)
October 18, 2014

Math
yes, quadratic equation
October 18, 2014

Math
speed before Forde = (s-5) speed after Forde = s time to Forde = (t+96) note 4 days = 96 hr time after Forde = t then distance = speed * time 70 = (s-5)(t+96) 60 = s t or t = 60/s 70 = (s-5)(60/s + 96) 70 = 60 + 96 s - 300/s - 480 490 = 96 s - 300/s 245 = 48 s - 150/s or 48 s^...
October 18, 2014

Physics
v = Vi + a t d = Vi t + (1/2) a t^2 2240 = 199 t + 4.25 t^2 solve quadratic for t then v = 199 + 8.5 t
October 18, 2014

Physics
d = (1/2) a t^2 176 = 4.35 t^2 solve for t v = a t = 8.7 t
October 18, 2014

PHYSICS 1301 (COLLEGE)
When people do not even go back and see if what they typed makes any sense, I just skip to the next question.
October 18, 2014

Calculus
v = -gt = -9.8*2 100 = 4.9 t^2 t = 4.52 seconds to ground so v = -9.8*4.52
October 18, 2014

chemistry
.55 a = .45(715)
October 18, 2014

calculus
4 cos anything is never bigger than 4 so there is no overlap here
October 18, 2014

Calculus
2 * L + 4*w = 800 so L = 400 - 2w A = L * w A = (400 -2w)w A = -2 w^2 +400 w dA/dw = 0 at max = -2 w + 200 w = 100 L = 400 -200 = 200
October 18, 2014

Calculus
decrease at start due to startup costs and paying off initial investment in staff and equipment increase over long term because we have to go deeper and deeper into the vein as we mine out the easy stuff near ground level.
October 18, 2014

Chemistry
heat it 25 deg C 550 * 2.03 * 25 Joules
October 18, 2014

physics please help
In the end torque = F*.4 - friction torque = I d omega/dt
October 18, 2014

physics please help
Not knowing that frictional torque, I am at a loss. Please proof read question.
October 18, 2014

Physics
69 v1 = 47 v2 so v2 = (69/47)v1 19 = (v1+v2)t 19 (v1 + 1.47 v1) t so v1 t = distance of first = 19/2.47 = 7.69 meters
October 18, 2014

Physics
same old conservation of momentum at first p = 2 *1 + m * 4.4 at the end p = (2+m) * 1.5 so (2+m)(1.5) = 2 + 4.4 m 3 + 1.5 m = 2 + 4.4 m etc
October 18, 2014

DIFF CALCULUS
now the volume is another story because now we will have to make some assumption, for example constant slope up from 3 m to 1 m. In that case we have a trapezoid and V = 6 * 12 * average depth = 6 * 12 * 2 - 144 m^3
October 18, 2014

DIFF CALCULUS
Part b is easy and requires no assumptions about the shape of the pool bottom. The rate of change of height = volume added per second / surface area of water. (draw a picture) or dh/dt = .25 m^3/min / (12m*6m) = .00347 m/min or 21 cm/hour
October 18, 2014

Algebra typo
22x maybe? what is the question anyway? factor it? put in an equal sign and solve it find zeros of parabola ? by the way x^2 + 22 x + 121 = (x+11)^2 (x+11)^2 -y^2 = (x+11-y)(x+11+y) because a^2-b^2 = (a-b)(a+b)
October 18, 2014

physics
if v = 0, p = 0 v ground = sqrt (2 g h) momentum at ground = m v = 4 sqrt (2 g h)
October 18, 2014

physics
falls from top for 6.65/2 = 3.325 seconds h = (1/2) (9.8) (3.325)^2
October 17, 2014

MATH HELP PLEASE
no sqrt 36 = 6 but what is sqrt 21 ?
October 17, 2014

Last ratio/equation
m/w = 10/12 so w = 12 m/10 then w/c = 10/15 12 m /10 / c = 10/15 12 m/c = 100/15 = 20/3 m/c = 20/36 = 5/9
October 17, 2014

equations
a/b = 5 so b = a/5 use that in the second a/5 / c = 2/3 multiply by 5 a/c = 10/3
October 17, 2014

equation
divide both sides by 3b 3a/3b = 5b/3b simplify a/b = 5/3
October 17, 2014

Science-Physics
y velocity = 8.9 x velocity = 19.3 tan theta = (8.9/19.3)
October 16, 2014

Science (Physics)
acceleration = change in velocity / change in time same as speed on the way up, but down not up or in other words it falls from 3 meters up m g h = (1/2) m v^2 so v = -sqrt(2 g h) = -sqrt ( 2 * 9.81 * 3)
October 16, 2014

Algebra
LOL - It happens
October 16, 2014

Algebra
for heaven's sake subtract: 1.10 - 1.05 = ?????? 1.15 - 1.10 = ??????
October 16, 2014

physics
I hope and pray we are talking about buoys and not boys. Anyway, here is a solution for totally immersed spheres. If the sphere waterlines are halfway down the sphere, then double the resistance. (you have half as much conductance) http://www.df.unipi.it/~macchi/TEACHING/...
October 16, 2014

normal distribution
http://davidmlane.com/hyperstat/z_table.html
October 16, 2014

Algebra 2
Now that point (5,6) 5 is beyond x = 3.5 so on the way down y = (7/2)(5)- (1/2)(25) = 10/2 = 5 will not make it over wall
October 15, 2014

Algebra 2
y = (7/2) x - (1/2)x^2 reasonable domain is above ground, y>0 so solve for zeros of x x^2 -7x = 0 x = 0 to x = 7 range (vertex is when x = half 7 or3.5 ymax = (7/2)(7/2) -(1/2)(7/2)^2 = (1/2)(49/4) = 49/8 = 6.125 so range is 0 to 6.125
October 15, 2014

Algebra 2 well, maybe
well, maybe y = a + b x + c x^2 3 = a + b(1) + c(1) 5 = a + b(2) + c(4) 6 = a + b(3) + c(9) so 2 = b + 3 c 1 = b + 5 c ---------- 1 = -2c c = -1/2 1 = b -5/2 b = 7/2 3 = a + 7/2 -1/2 = a + 3 so a = 0 y = 0 + 7 x/2 - x^2/2 y = (7/2) x - (1/2)x^2 or 2 y = 7 x - x^2
October 15, 2014

Algebra 2
y = a + b x^2 3 = a + b (1)^2 = a + b 5 = a + b(2)^2 = a + 4 b b = 3 - a 5 = a + 4(3-a) 5 = a + 12 - 4a 3 a = 7 a = 7/3 b = 9/3 - 7/3 = 2/3 so y =7/3 +2/3 x^2 check last point y = 7/3 + (2/3)(9) = 7 1/3 I do not think your table is a parabola
October 15, 2014

Pre-Calc/Trig...
v = Vi - g t at top v = 0 0 = 4 -32 t t = 1/8 second (4 ft /sec is really slow. I bet you mean 40) h = 10 + 4 (1/8) - 16 (1/64) = 10 + .5 - .25 = 10.25 ft
October 15, 2014

science
both the same ( Newton #3 action equal and opposite to reaction) F = G * 6 * 7.3 / .65^2 where G = 6.67 * 10^-11
October 15, 2014

Math
maybe ln y = ln 35.15 + 1.04 x
October 15, 2014

Algebra 2
332/2 = 166 = v+c 318/2 = 159 = v-c 2 v = 166+159 = 325 etc
October 15, 2014

Math 112
(86 + 88 + z)/3 = 90 86 + 88 + z = 270 etc
October 15, 2014

Pre-Calc/Trig...
(2x-1)(x+3) = 0 --> 1/2 and -3 x^2 - x - 1 = 0 x = [1 +/- sqrt (1+4) ]/2 = 1/2 +/- (1/2) sqrt 5
October 15, 2014

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