Thursday
February 11, 2016

Posts by Damon

Total # Posts: 25,210

SOCIAL STUDIES
So I guess you abandoned A and chose C ?
December 16, 2015

Math
area goes as square of scale ratio 24 (9/4)
December 16, 2015

Maths
tan 54 = h/51
December 16, 2015

Mathematics
x^2 - (a+b) x + a b - k^2 = 0 x = [(a+b) +/- sqrt { (a+b)^2 -4(ab-k^2)} ]/2 if (a+b)^2 -4(ab-k^2) is positive, there is no complexity = a^2 + 2 ab +b^2 -4ab + 4k^2 = a^2 -2ab + b^2 + 4 k^2 = (a-b)^2 + 4 k^2 BOTH of those terms are positive being squares of real numbers, whew ...
December 16, 2015

physics
90,000 meters / 3600 seconds = 25 m/s=Vi v = Vi + a t 0 = 25 + a t so a t = -25 and t = -25/a d = Vi t + .5 a t^2 50 = 25 (-25/a) + .5 a (625/a^2) 50 = -625/a + .5 (625/a) 50= -625/2a 100 a = -625 a = -6.25 then F = m a
December 16, 2015

math
2w+2L = 18 w+L = 9 8 and 1 ---> 8 7 and 2 ---> 14 6 and 3 ---> 18 5 and 4 ---> 20 note - the closer to a square, the bigger the area
December 16, 2015

physical science
v^2/r v = 2 pi r /T = 2 pi (3500/400) v = 55 m/s v^2/r = 55^2/3500 = .864 m/s^2
December 16, 2015

phyics
speed is 0 at the top so to get time to top 0 = Vi - 9.81 t Vi = 9.81 t then do height at that top t 4.8 = 1.2 + Vi t - 4.9 t^2 3.6 = 9.81 t^2 - 4.9 t^2 4.9 t^2 = 3.6 t = .857 second Vi = (9.81 ) .857 = 8.41 m/s
December 16, 2015

Algebra
slope = (7/10 + 1/5) / (1/4 - 2/3) = (7/10 + 2/10) / (3/12 - 8/12) = 9/10 / -5/12 = -54/60 / 25/60 = - 54/25 y = -(54/25) x + b 7/10 = -(54/100) + b b = 124/100 so y = -(54/25) x + 31/25 25 y + 54 x = 31
December 16, 2015

science
resistivity is a characteristic of material NOT GEOMETRY RESISTANCE is another story.
December 16, 2015

science
it varies the resistance. of course if the voltage is a constant, the current also changes
December 16, 2015

Statistics
.9 * 10 = 9
December 16, 2015

A.V. M. Sr. sec. school faridabad
The same typo question
December 15, 2015

Nonsense
This three times repeated question is worded incorrectly. Obviously either could do the job many times in 15 days
December 15, 2015

Typo?
I do not understand either.
December 15, 2015

algebra
y = m x + b when y= 0, x = 3 when x = 0, y = 2/3 so 2/3 = 0 + b or b = 2/3 y = m x + 2/3 then when y = 0 , x = 3 0 = m (3) + 2/3 m = - 2/9 so y = -2/9 x + 2/3 or 9 y = -2 x + 6
December 15, 2015

4th grade Number patterns
This is an arithmetic sequence see : http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html term n = a + d(n-1) a = 23 d = -2 term 7 = 23 -2 (6) = 11
December 15, 2015

Physics
Thrust - weight = m a Thrust = m g + m a a =( Thrust-mg ) / m a = Thrust/m - g a = 27/1.5 - 9.81 = 18 - 9.81 = 8.19 m/s^2
December 15, 2015

Algebra
v+c = 20/5 = 4 v-c = 20/8 = 2.5 ----------------------add 2 v = 6.5 v = 3.25 c = 4 - 3.25 = .75
December 15, 2015

Algebra
x-1/5 = 3 x = 3 1/5 = 16/5 -x+1/5 = 3 x = -14/5 C
December 15, 2015

Algebra
I do not understand the notation for #1 2 change in y is constant -5 for changes of 1 in x linear, down you are right D 3 right 4 .9n-.4 yes A
December 15, 2015

physics
let's say x = A sin w t v = A w cos w t a = -A w^2 sin wt = -w^2 x w = sqrt k/m but we do not really need to know that max potential energy = (1/2)k max x^2 = (1/2) k A^2 max kinetic energy = (1/2) m v^2 but max v^2 = A^2 w^2 so max ke = (1/2) m A^2 w^2 the max ke = max pe...
December 15, 2015

Math
no, the slope you got was 1.10 I suspect. Of course I do not see your data.
December 15, 2015

Math
all lengths scale with the scale ratio 10*6 = 60 when they ask for areas - they scale with the square of the ratio and volumes scale with the cube
December 15, 2015

wrote converse wrong
converse: if not a triangle, then four sides (maybe)
December 15, 2015

Geometry
I have to write this on my brain first: hypothesis: If a cow, then a mammal converse: If a mammal, then a cow (maybe) inverse:If not a cow then not a mammal(maybe) contrapositive: if not a mammal, then not a cow - TRUE ok, now Hypothesis: if 4 sides, then not a triangle ...
December 15, 2015

Maths
3 sin^2 T - sin T = 1/4 ???? let z = sin T 3 z - z = 1/4 z - z/3 = 1/12 z - z/3 + 1/36 = 3 /36 + 1/36 = 4/36 = 1/9 (z-1/6)^2 = 1/9 z = 1/6 +/- 1/3 z = 1/2 or z = -1/6 if sin T = 1/2 T = 30 degrees or pi/6 if sin T = -1/6 T = -9.6 degrees
December 15, 2015

Physics
2 rev * 2 pi radians/rev = 4 pi radians so omega = 4 pi radians / 1.9 seconds
December 15, 2015

Physics
g (change in h) = (1/2)v^2 or v = sqrt (2 g*change in h) (note - m is irrelevant. That is lucky or a full car would be faster than a light one)
December 14, 2015

math
in first year: 245,000 in second year 245,000 (1.15)^1 in third year 245,000 (1.15)^2 in nth year 245,000 (1.15)^(n-1) NOW - go to web site Math is fun and look upo geometric sequence with a = 245,000 and r = 1.15 it also shows you how to sum the first ten terms :) http://www....
December 14, 2015

Physics
http://www.jiskha.com/display.cgi?id=1450123171
December 14, 2015

Physics
been there done that see calculus below
December 14, 2015

Calculus
well, let's find the vertex and intercepts. x^2 - 11 x = -y - 24 x^2 - 11 x + 121/4 = -y - 24 + 30.25 (x-11/2)^2 = -(y-6.25) so PN = 6.25 now what are A and B when y = 0 (x-11/2)^2 = 6.25 x-5.5 = +/- 2.5 x = 3 or 8 A is at 3 and B is at 8 so 2 PN * AB = 62.5 divide by ...
December 14, 2015

Calculus, Physics
http://www.jiskha.com/display.cgi?id=1450123171
December 14, 2015

Calculus, Physics
So you want me to do it three times?
December 14, 2015

math answers??? correct me :/
Yes
December 14, 2015

Science
You are welcome.
December 14, 2015

Science
Humm, not my thing but I think a predator would be a lion or something that eats the whole dog. This looks like a parasite to me, just living inside and feeding off the dog.
December 14, 2015

Math
so much to get on board plus so much per mile for example if the costs were one mile for $10 two miles for $15 then cost = m x + b 10 = m (1) + b 15 = m(2) + b -------------- subtract -5 = m - 2 m = - m so m = 5 then b = 5 so cost = 5*(miles) + 5 five to get aboard, + five per...
December 14, 2015

Physics
initial momentum right = m v - 2m*3v = -5 m v final momentum the same final mass = 3 m so 3 m Vfinal = - 5 m v Vfinal = - (5/3) v
December 14, 2015

Physics
Ah, no way a diver would be that poorly weighted but anyway .65 g/cm^3 = 650 kg/m^3 volume of diver = 100 kg/650 kg/m^3 = .154 m^3 buoyancy force on diver = .154m^3 * 1000 kg/m^3 * 9.81 = 1509 Newtons up diver weight down = 100*9.81 = 981 N so force up on spring = 1509-981 = ...
December 14, 2015

Physics
m g h = m C delta T so delta T = g h /C where C is specific heat of water.
December 14, 2015

Physics
Remember: In a car you can measure speed with a speedometer. but for velocity you need both a speedometer and a compass. Speed is the magnitude of the velocity vector, a scalar.
December 14, 2015

Physics
Both velocity and acceleration are vectors. Vectors have magnitude and DIRECTION. Their magnitudes may stay the same, speed may be constant tangential to orbit path and acceleration magnitude toward earth. HOWEVER The velocity and acceleration DIRECTIONS change constantly, so ...
December 14, 2015

math
e+4=c e-7 +c-7 = 22 e - c = -4 e + c = 36 -------------- add 2 e = 32 so e = 16 then c = 20
December 13, 2015

math
2 L + 2 w = 400 L + w = 200 L = w + 40 so w + 40 + w = 200
December 13, 2015

science
m1 (1/2) m 1 v^2 m2 (1/2) m2 (2v^2) = (1/2) m2 v^2 * 4 if the masses were the same, then 4 times
December 13, 2015

Physics
fall from 2 meters potential energy loss = m g h =.01 *9.81*2 = .1962 Joules kinetic energy gain = (1/2)mv^2 =.005(9) =.045 Joules difference is lost to heat .1962 - .045 = .151 Joules
December 13, 2015

Math
the race for smallest is between .09 and 1/8 now divide 1 by 8 and see what you get or divide .25 by two
December 13, 2015

physics
before East momentum = 22000 North momentum = 3000 v after East momentum = 5200 (5.16 cos 35) North momentum =5200 (5.16 sin 35) so 3000 v = 5200 (5.16 sin 35) solve for v
December 13, 2015

Math
I suspect you might mean 5^(x+4)=125^(1-3x) 5^(x+4)=(5^3)^(1-3x) 5^(x+4)=5^3(1-3x) (x+4) = 3 - 9 x 10 x = -1 x = -.1 ===================== or (x+4) log5 (5) = (1-3x) log5(5^3) (x+4) log5(5) = (1-3x)(3)log5(5) but log5(5) = 1
December 13, 2015

Physics
.4 = (1/2) k (.0375)^2
December 13, 2015

Physics (angle Vector)
cos (heading) = 5.4/11.8
December 13, 2015

science
heat in = 130 * .2 * 25 Joules
December 13, 2015

Physics
m g h = 35 * 9.81 * 5 Joules part B is negative part A
December 13, 2015

math
simple interest is the same every year so interest = 3900/8 = 487.50 per year (487.50/7500) 100 = 6.5 %
December 13, 2015

Math
You are welcome.
December 13, 2015

Math
just like if it were 50/100 as a percent = (1/2) * 100 = 50%
December 13, 2015

Math
(300/100) * 100 = 300 percent
December 13, 2015

Structures
delta L/L = F/area / E delta L = 144 in * 36*10^3 lb /5.5 in^2/1.3*10^6 = 725 * 10^-3 = .724 inches (scary! probably fails under buckling but we were not asked) )
December 13, 2015

physics
horizontal = 80 cos 60 vertical = 80 sin 60
December 13, 2015

Physics
height above bottom of swing = 1.75 *(1-cos 35) = .316 meters up so potential energy relative to bottom of swing = m g h = 22 (9.81)(.316) = 68.3 Joules (1/2) m v^2 = 68.3 so v^2 = 2 * 68.3 /22 v = 2.49 m/s loss = 68.3 - (1/2)(22)(2.2)^2
December 13, 2015

physics
Well, let's see how far down it went: sin 30 = h/3 so h = 1.5 meters high so at the top it has potential energy = m g h = 10*9.81*1.5 = 147 Joules compared to when it hits the ground. ------------------------------------- Let's look at the friction: weight = m g = 98.1...
December 13, 2015

Physics
-1.01 * 10^3 N = .144 a a = -7.01 * 10^3 m/s^2 v = Vi + a t at the end, v = 0 0 = 40.5 - 7.01*10^3 t so t = time to stop = 5.77 * 10^-3 seconds d = Vi t + (1/2) a t^2 = 40.5 * 5.77*10^-3 - 3.5*10^3 (5.77)^2 *10^-6 = 234 *10^-3 - 117*10^-3 = 117*10^-3 = .117 meteres
December 13, 2015

Calculus
There are two ways of thinking about this: 1. Straight math V = (4/3) pi r^3 dV/dr = 4 pi r^2 2. Common sense dV = surface area * dr dV = 4 pi r^2 dr anyway dV/dt = dV/dr dr/dt dV/dt = 4 pi (25) (.15) if D = 12 then r = 6 dr = dV/4 pi r^2 dr/dt = (1/4*36 pi ) dV/dt
December 13, 2015

B/dar yes, physics
F = m Ac = m v^2/R = 800 (100)/65 = 1231 Newtons
December 13, 2015

Physics
v = 22 22^2 = 484 the velocity is given as 22 m/s at the start I got the final velocity from the kinetic energy , the initial ke plus the amount gained in the fall
December 13, 2015

Physics
1. If you call the potential zero at ground level then at the start the projectile has: potential + kinetic = m g h + (1/2) m v^2 = 2.5 * 9.81 * 15 + (1/2)(2.5)(484) = 368 Joules potential + 605 J kinetic = 973 Joules total 2. we did that above, it is the loss in potential ...
December 13, 2015

Physics
m v = .01 * 1000 = 10 kg m/s
December 13, 2015

PHYSICS( FRICTION)
which at 2 and which at 8? assuming the small one is at 2 and the big one at 8 normal force = 9.81 N friction force = .4*9.81 = 3.92 N forward force on top small block = 3.92 a of small block = 3.92/1 = 3.92 m/s^2 so speed of small block = 2 + 3.92 t back force on big block...
December 13, 2015

Physis
There is no vertical problem here, no vertical motion final momentum = initial momentum = 0 horizontal speed of rock = 11.9 cos 36.8 so 14.8*11.9 cos 36.8 - 70.5 v = 0
December 13, 2015

Math
.75 w = 3900 so w = 3900/.75 = 5200 Liters
December 13, 2015

maths
A = Ao * (1/2)^(n/22) .8 = .5^(n/22) log .8 = (n/22) log .5 n/22 = .3219 n =7.08 years
December 13, 2015

physics
d = (1/2) a t^2 11 = (1/2) a (25) a = .88 m/s^2 so 80 = m (.88) m = 90.9 kg v = a t = .88*5 = 4.4 m/s which continues without force for five seconds so 4.4 * 5 = 22 meters more
December 13, 2015

Physics
force down = 600 force up = Fd 600 - Fd = m a = 61.2 * 7.6 so Fd = 600 - 465 Fd = 135 N so I agree with you
December 13, 2015

Math
500 = L + 2 w so L = 500 - 2 w Area = L w = (500 - 2 w)w = 500 w - 2 w^2 where is vertex of that parabola? 2 w^2 - 500 w = - A w^2 - 250 w = -(1/2) A w^2 - 250 w + 125^2 = -(1/2) A + 15625 (w-125)^2 = -(1/2)( A - 31250) so A = 31250 at vertx
December 12, 2015

math
x = 4-2y V = value =(4-2y)^2 + (4-2y)y - y^2 V = 16 - 16 y + 4y^2 + 4 y -2 y^2 -y^2 V = y^2 - 12 y + 16 so y^2 - 12 y = V-16 y^2 - 12 y + 6^2 = V - 16 + 36 (Y-6)^2 = V+20 vertex at v = -20
December 12, 2015

physics
Yes acceleration in m/s^2 /9.81 = number of g s
December 12, 2015

No idea
where these points are or why she is exerting 80 N on a pole that weighs about 50 N Is she holding it near and end - up with one hand and down with the other to balance weight and moments?
December 11, 2015

Math
You are welcome.
December 11, 2015

Math
start at the decimal and move right until you get one non zero number on the left, namely 5 You had to move right SIX spaces which is multiplying by ten six times so .00000512 * 10^6 = 5.12 so .00000512 = 5.12 /10^6 which is 5.12*10^-6
December 11, 2015

Calulus
ok first split it 4 e^x dx - 3 dx 4 e^x - 3 x evaluate at 6 and subtract the value at x = 1 ------------------------- or perhaps you mean 4 e^(x-3) dx then you have 4 e^(x-3) = 4 e^-3 e^x so integrate (4 e^-3) integral e^x dx which is just 4 e^-3 e^x or 4 e^-3 [ e^6 - e1 ]
December 11, 2015

I do not understand
what do you mean plus the number and do you mean integrate from x = 1 to x = 6 or what?
December 11, 2015

Algreba
2 * x^6 * 3 * x*(1/2) = 2 * 3 * x^6 * x^1/2 = 6 * x^(6 + 1/2) = 6 x^(12/2+1/2) = 6 x^(13/2)
December 11, 2015

Geometry
1. I disagree 2. isosceles vertex angle is 4x-3 other two are both x - 3 so (4x-3) + 2 (x-3) = 180
December 11, 2015

Math
2 x^2 - 4 x + c = 0 for real solution sqrt (4^2 - 4*2*c) must be real so 16 - 8 c must be positive so 8 (2-c) must be positive so c <= 2
December 11, 2015

Physics
sqrt (300^2 + 50^2)
December 11, 2015

SCIENCE
silver of course because it is a great conductor but perhaps if I did not own a silver mine I might choose copper which is pretty good but a bit less expensive. good insulator, like glass, but if it has to bend use plastic or rubber.
December 11, 2015

maths (trigonometry)
sqrt (225+64)
December 11, 2015

maths
lol 60 + 30 = 90 a right angle so the tower is the hypotenuse h^2 = 225 + 64
December 11, 2015

probability
p success = .91 p fail = .09 chances of missing zero + chances of missing one 4C0 = 1 so 1 * .09^4 * .91^0 = .09^4 = 6.56*10^-5 4C1 = 4!/[3!] = 4 so 4*.09^3*.91 = .00265 .00265 +.0000656 = .00272
December 11, 2015

Mathematics
x log 3 = log 7 x = log 7/log 3 unclear what is exponent 2 or 2x or 2x+1 use parentheses I will guess 4^(x-6) = 2^3x 2^2(x-6) = 2^3x so 2x-12 = 3x
December 11, 2015

Math
Find probability of rolling 12 which is 6 on both dice 1/6 * 1/6 It is (1 - that)
December 11, 2015

Math
tangent is not defined at x = 1. Slope is 2 on the left and 1.5 on the right.
December 11, 2015

algebra 2
http://www.mathportal.org/calculators/polynomials-solvers/polynomial-graphing-calculator.php note two real roots 1 2.383 two complex roots
December 10, 2015

math
f = 3 s f+12 = 2(s+12) 3 s + 12 = 2 s + 24 s = 12 f = 36
December 10, 2015

Algebra
6x+10y must be AT least 120, She would prefer more so 6x+10y >= 120 which is B
December 10, 2015

Math
15000/200
December 10, 2015

Math
I do not know any better than you do and suspect that they want you to say 3 although we both know that it can not quite be 3.
December 10, 2015

Physics
r = 3963 + 125 circumference of orbit = 2 pi r time = circumference /19700
December 10, 2015

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