Tuesday
June 28, 2016

Posts by Damon

Total # Posts: 26,397

calculus
a = -9.8 v = Vi - 9.8 t h = Hi + Vi t +(1/2) a t^2 h = 2300 + 0 t - 4.9 t^2 = 2300 - 4.9 t^2
April 7, 2016

calculus
v = vi - a t 0 = 7 - 9.8 t t = 7/9.8 at top when v = 0 h = 3 + 7 t - 4.9 t^2
April 7, 2016

physics
frequency proportional to sqrt(g/L) g proportional to mass of planet and 1/r^2 g planet = g earth * 1.75/6.25 = .28 sqrt gplanet = sqrt gearth =.529 so frequency is .529 tht on earth period = 1/f so 1.6/.529 = 3.02 seconds
April 7, 2016

calculus
d^2y/dx^2 = x^2 dy/dx = (1/3)x^3 + c 8 = 0 + c so c = 8 or dy/dx = (1/3)x^3 + 8 y = (1/12)x^4 + 8 x + k 8 = 0 + k so k = 8 y = (1/12)x^4 + 8 x + 8
April 7, 2016

Pre cal
b = 12 / sin 55
April 7, 2016

Math
He ran more last week If he ran 6 miles last week then he ran 5 miles this week the 25 2/3 is just noise on the circuit all that matters is the 5/6
April 7, 2016

Math
Now that is quite enough ! 5/6 is LESS than ONE
April 7, 2016

physics
x = A sin 2 pi f t x = A sin 12.9 t v = dx/dt = 12.9 A cos 12.9 t v = 1.9 = 12.9 A cos 0 = 12.9 A A = 1.90/12.9 = .147 meter
April 7, 2016

English
A traditional African marriage is advantageous for the man but not for the woman.
April 7, 2016

Physics - urgent
http://www.physicsclassroom.com/class/sound/Lesson-5/Closed-End-Air-Columns remember period T = wavelength/speed and f = 1/T = 350/wavelength here the lowest frequency is when .14 meter = half a wavelength so wavelength = .28 meter lowest f = 350/.28
April 7, 2016

Pre cal
49 + 16 = 65 so sqrt 65 which is about 8.062257748
April 7, 2016

Science
I did not bother to Google but your answers look correct to me.
April 7, 2016

Physics
The center of mass of the system continues at rest because there are no external forces on the system. cg at 0 forever m girl * distance from 0 = m plank * distance from 0 center of plank moves 3 to right if girl now 2 meters from CG of system to left 3*12.6 = 2 m m = 3 * 6.3...
April 7, 2016

Physics
I assume a short circuit so total voltage is 0 V = L di/dt + iR = 0 let i = I e^kt then when t =0, i = I di/dt = I k e^kt = k i V = L I k e^kt + I e^kt R = 0 L k + R = 0 k = -R/L but I bet you knew that so k = -130/50*10^-3 = -2.6*10^3 I = 12 so i = 12 e^-2.6*10^3 t 4.8/12 = ....
April 7, 2016

Physics
frequency is proportional to square root of tension f *sqrt (25) = 5 f
April 7, 2016

Math
it will be 1/8 times as large so small
April 7, 2016

Math
Evie, all your questions are the same if the numerator is bigger than the denominator, the fraction is bigger than one 4/3 is bigger than one so MORE
April 7, 2016

math
30 ft (1 m/5280 ft) = .00568 mile v = .00568 /T in hours T in hours = .00568 /v T in seconds = 3600*.00568/v = 20.45/v clicks/second = 1/T = v/20.45 so v = 20.45 * clicks/second 1 click/second --> 20.45 mph 2 clicks/second -->41 mph v = 20.45 * clicks/second = clicks/20....
April 7, 2016

Math
2/5 is less than 5/5
April 7, 2016

Math
(5/4)w * w = 180
April 7, 2016

science
total y momentum = 0 m * 1.5 sin 30 = m v sin T so v sin T = 0.75 total x momentum = 2 m 2 m = 1.5 m cos 30 + m v cos T v cos T = .7 v sin T/v cosT = tan T = .75/.7 T = 47 degrees v = .7/cos 47
April 7, 2016

Math
L = 14 w/13 (14 w/13)(w) = 4800 w^2 = 13 (4800/14) w = 66.76
April 7, 2016

English
yes
April 7, 2016

Physics 1
potential energy loss = m g h = 3.08 * 9.8 * 1.27 = kinetic energy gain = (1/2) (1.95)v^2 + (1/2)I (v/r)^2 so what is v at the end of this experiment? find acceleration 1.27 = (1/2)a t^2 1.27 = (1/2)a (.83)^2 so a = 3.69 m/s^2 and v = a t = 3.69(.83) = 3.06 m/s at the end...
April 6, 2016

i need help plz
You, anyone, can copy a bit of it for just about any purpose - parody, comment, review, .... whatever
April 6, 2016

slope
well, check it and see.
April 6, 2016

slope
well, we know it is y = -4 x + b so all we need is b 5 = -4(9) + b 5 = -36 + b b = 41 so y = -4 x + 41
April 6, 2016

History
It stood officially for slave stealer, but abolitionists called it "slave savior".
April 6, 2016

History
Yes, got sick while sneaking slaves out. Slaves could not navigate and boat was taken and Walker arrested etc.
April 6, 2016

History
We can not tell. Gibberish. Reed is telling you you probably listed answers to another question. I told you south is wrong for sure. I am wondering if you are paying attention.
April 6, 2016

History
I do not know what Brace is being compared to but he shipped kids more from New York area West so not mostly southern.
April 6, 2016

College Algebra/pre-calculus
agree
April 6, 2016

physics
Be sure to check my arithmetic carefully !
April 6, 2016

physics
v = 6.58 so omega = 11 radians/second
April 6, 2016

physics
fell distance 4.05 so lost potential energy m g h = 3 * 9.81 * 4.05 That is kinetic energy of bucket plus spool v = omega R = .6 omega call omega = w Ke = (1/2) m v^2 + (1/2)I w^2 = (1/2)v^2 (m + I/.36) I = 5 * .5 * .36 = so I/.36 = 2.5 so 3 * 9.81 * 4.05 = .5 * v^2 *(5.5) ...
April 6, 2016

Physics miscounted
134.4
April 6, 2016

Physics
C = Q/v = 40*10^-6 Q = 40 * 10^-6 v i = dQ/dt = 40*10^-6 dv/dt let v = V sin wt dV/dt = V w cos wt so i = 40*10^-6 V w cos w t max i = 40*10^-6 V w w = 2 pi f = 2 pi(60) = 377 so max i = 40*10^-6 * 377 V so V = (2.26/(15080)) 10^6 =1344
April 6, 2016

Math help please
YOU MEAN sin^2 x=[ 1-cos(2x) ] /2 or 2 sin^2 x = 1 - cos(2x) cos 2 x = cos^2 x - sin^2 x so 2 sin^2 x = 1 - cos^2 x + sin^2 x sin^2 x = 1 - cos^2 x or sin^2 x + cos^2 x = 1 which is true
April 5, 2016

Physics
620 * .39 = x * 1.53 so (.39/1.53)620
April 4, 2016

Algebra
maybe you want: 3 7 2 3,7 3,2 7,2
April 4, 2016

English
Either but I would pick 2 because in the end the person, not the food, is supposed to be healthy.
April 4, 2016

Math
log3 (3m) log a + log b = log ab That is how a slide rule works. That is how old I am :)
April 4, 2016

PHYSICS!!!
ke at bottom = (1/2) m v^2 = (1/2) m (144) = 72 m Joules pe at top = m g h= m (9.81)(12.2 sin 18 = 37 m Joules so Lost 72-37 = 35 m Joules to friction Friction force = mu m g cos 18= 9.33 mu m work done by friction = 9.33 mu m * 12.2 = 114 mu m so 35 m = 114 mu m mu = 35/114...
April 4, 2016

PHYSICS!!!!
10 km/hr = 10/3.6 = 2.78 m/s 3 km/hr = 3/3.6 = .833 m/s 5 km at 10 km/hr --> 30 min which is 30 *60 = 1800 s energy = 700*1800 = 1.26*10^6 Joules 5 km at 3 km/hr --> 6,000 s 6,000 s * 300 w = 1.8*10^6 Joules ==============================
April 4, 2016

Physics
assuming that your potential energy is defined as zero at the bottom of the hill, all your energy is kinetic by the time you get there. 800 + 200 = 1000 Pert of this problem statement is missing though. In potentials, all you can define is differences. You have to define some ...
April 4, 2016

Math
2 pi r = 2 pi *7 = 14 pi inches
April 4, 2016

PHYSICS!!
change in potential energy = m g h = 2219*4*sin 30 = 4438 Joules = (1/2)mv^2 + (1/2)I w^2 but w = v/r = v/.4 = 2.5 v so 4438 = (1/2)(226)v^2 + (1/2)(22.6)(6.25 v^2) or 4438 = 184 v^2 so v = 24.2 m/s and w = 60.4 radians/s Torque * angle = change in Ke T * 2 pi = (1/2) I w^2
April 4, 2016

PHYSICS!!
first mass of rubber = 2000 * .3 * ∫ 2 pi r dr from r = .2 to r = .4 = 600 (2 pi) (1/2)(.16-.04) = 226 kg 226 * 9.81 = 2219 Newtons weight I = 2000*.3 *∫ 2 pi r^3 dr = 3770 (1/4)(.4^4-.2^4) = 22.6 ===================
April 4, 2016

PHYSICS!!
time = 100 * 3600 = 3.6 * 10^5 s so energy used= 120*3.6*10^5 = 432 * 10^5 Joules = m g h = 65 * 9.81 * h so h = .677 * 10^5 = 67,700 meters
April 4, 2016

Math
but 24 inches = 2 feet so r = 1 foot (4/3) pi (1)^3 = 4.19 ft^3 by the way 4/3 x 3.14/1 = 1.395 is wrong --- should be 4.19
April 4, 2016

Math
3/4 = .75 3/8 = .375 which is bigger?
April 4, 2016

Math
2(3.14 x 0.25) + 2(3.14)(.5)(4) answer in feet^2
April 4, 2016

no
You have to use all feet or all inches r = 0.5 feet NOT 6 inches
April 4, 2016

math
s + (s+30) = 36 2 s = 6 s = 3 f = 33
April 4, 2016

Math-soh cab toa
sin 30 = h/70 but we all know sin 30 = 1/2 so 35
April 4, 2016

Physics
final angular momentum about axis of rotation = initial angular momentum initial ang mom = 78*1.6 * 2 = 250 kg m^2/s final ang mom = 78 (2)^2 omega + 651 omega omega ( 963) = 250 omega = .26 radians/second
April 4, 2016

History
I would have chosen B A ---- interchangeable parts, came before assembly lines for example in weapons manufacture (Colt in Connecticut for example)
April 4, 2016

History
I suppose I have to agree, but we lost our forests here in Massachusetts to farming and wood stoves long before we had woolen mills and Springfield rifles. The really tall pines of course were marked with broad arrow symbols and reserved for the king's masts.
April 4, 2016

Hard math question
suspect 1 * 2 * 4 = 8
April 4, 2016

Engineering science
oh and for time avergae speed = 6/2 = 3 m/s so t = 4/3 seconds
April 4, 2016

Engineering science
normal force = m g cos 25 friction force = mu m g cos 25 = force down slope = m g sin 25 so sin 25/cos 25 = tan 25 = mu = .466 =================== at 10 degrees friction force = .466 m g cos 10 = .459 m g work done by friction = .459 m g d = loss of kinetic energy = (1/2)m(36...
April 4, 2016

Math
anything with straight sides and pointy top has volume = (1/3) height * base area so 1/3
April 3, 2016

trigonomentry help!!!
(x-q)(x-4q) = a x^2 + b x + c x^2 - 5qx + 4 q^2 =a x^2 + bx + c if a = 1 b = -5 q c = 4 q^2 then 4 b^2 = 100 q^2 and 25 a c = 100 q^2 and 100 q^2 -100 q^2 = 0 all right
April 3, 2016

chem
Mg + 2 HNO3 → Mg(NO3)2 + H2
April 3, 2016

Math
Perhaps you meant 0.15 % ?????
April 3, 2016

Math
55 = .15 x x = 366 2/3 which is about 367 :)
April 3, 2016

Geometry
rectangle is (53 + 6) by (55 + 6) or 59 by 61 2*59 + 2*61
April 2, 2016

algebra
I gues you are looking for a straight line of slope m = 3 through the point (4,5) y = 3 x + b 5 = 3*4 + b 5 = 12 + b b = -7 so y = 3 x - 7
April 2, 2016

computer science
I guess I would let n = 0 and y = 0 then I would say n = n+1 y = 12 * n if y > 30 go to the end immediately and stop then I would store and print y go back to that n = n+1 stop and end
April 2, 2016

Math
e^cos t = value at t - value at pi = value at t - e^cos pi but cos pi = -1 so e^cos t = value at t -e^-1 or e^cos t = value at t - 1/e so value at t = 1/e + e^cos t ------------------- now do value at t - value at 0 value at 0 = 1/e + e^1 = 1/e + e value at t = 1/e + e^cos t ...
April 1, 2016

science
work done = increase in kinetic energy = (1/2) m (V2^2-V1^2) V2 = 72/3.6 meters/second V1 = 54/3.6 meters/second m = 1500 kg then answer will be in Joules
March 31, 2016

physics
distance from each = d = sqrt(5^2+12^2) = 13 cm = .13 meter however we may notice that the component along the bisector will be zero due to the opposite signs of the charges. However that is no true of the component along the direction between charges E = k q/.13^2 for each ...
March 31, 2016

Science
http://en.wikipedia.org/wiki/Electromagnet
March 31, 2016

Science
the B field strength is proportional to the number of turns.
March 31, 2016

Mathematics
Looks like a typo problem to me the original was probably round to the nearest thousand dollars, 2000
March 31, 2016

math
Well done :)
March 31, 2016

math
Good :)
March 31, 2016

math
You are welcome, but more importantly do you know how to tell a straight line from a parabola or an exponential now?
March 31, 2016

math
You typed y = 5x, look up above. I found it correct in one of your earlier postings.
March 31, 2016

AHHH!! NO
Look, they are asking you which of these is a straight line with constant slope. In other words which looks like Y = m X + b That is B y = 19 x - 10 A, x^2 - 5 x - 14 is a QUADRATIC, parabola C, y = 5^x (NOT y = 5 x ) is exponential D, y = .03 x^2 etc is QUADRQATIC, parabola
March 31, 2016

ah ha - you typed it wrong
B)y = 19x – 10 C)y = 5^x NOT THIS. This is NOT 5 x as you wrote later.
March 31, 2016

math
There are two with constant slopes. B and C If you think there is only one answer, you have a typo.
March 31, 2016

math
B and C 19 and 5
March 31, 2016

College Algebra
the slope is -29 crimes per year In other words the number of crimes decreases by 29 every year. when t = 0, C = 31,000. That is the number of crimes when the equation started in 1998 I suspect the 31,000 is a typo as is the 29
March 31, 2016

math
the derivative is constant in B and C
March 31, 2016

Physics
334 * 2000 = 668,000 J
March 31, 2016

Geometry
x^2 + 10 x - 1200 = 0 (x-30)(x+40) = 0 x = 30 or x = -40
March 31, 2016

Algebra 2
3 150 4 150 + d 5 150 + 2 d = 180 so d = 30/2 = 15 month 1 = 150-30 = 120 An = 120 + (n-1)15 A12 = 120 + 11(15) = 285 yes correct 500 = 120 + (n-1)15 n - 1 = 25.33 n = 26.33 yes, 27
March 31, 2016

math
I guess A is at center and AB bisects CD ???? we need to know angle at center cos (T/2) = 4/5 T/2 = 36.9 degrees T = 73.7 degrees so area = (73.7/360) pi R^2
March 31, 2016

physics
horizontal speed = u = 50 cos 37 t = 80/u then how high is it at t h = (50 sin 37) t - 4.9 t^2 then d = sqrt (80^2 + h^2)
March 31, 2016

math
http://davidmlane.com/hyperstat/z_table.html
March 31, 2016

math
http://davidmlane.com/hyperstat/z_table.html
March 31, 2016

Algebra 2
d = -27 + 22 = -5 -7 - 5 = -12 -12 - 5 = -17 -17 - 5 = -22 so the last one on the list
March 31, 2016

Math - Slope intercept
sure looks like it to me. They asked the same question twice. I bet they meant to say: Write the equation in standard form 6 x - 3 y = 2 then solve for y in slope intercept form but who knows
March 31, 2016

luthayi high school. science
http://www.nlm.nih.gov/medlineplus/ency/article/002680.htm
March 30, 2016

This is a trick question
Velovicy is a VECTOR north one way, south back 31 lengths, 30 of which were back and forth so went 50 meters total north in the end How long did it take? 31 * 50 = 1550 meters back and forth at 900 m/3600 s time = 1550 *3600/900 = 6200 seconds so 50 meters/6200 seconds = 0....
March 30, 2016

physics
I will do position last a = dv/dt so a = -10*10^7 t + 3*10^5 zero at t = 3/10 * 10^-2 = .003 seconds a is positive for the whole .003s find v at t = .003 for part c x = integral v dt with x = 0 at t = 0 so x = (1/3)(-5.00×10^7)t^3 +(1/2)(3.00×10^5)t^2 length of ...
March 30, 2016

physic
k = 20 N/.098 m = 204 N/m m = 20/9.81 = 2.04 kg omega = w = sqrt (k/m) radians/second so w = sqrt (204/2.04) = 10 rad/s if x is distance from equilibrium position, positive up x = -.05 cos 10 t
March 30, 2016

but
You may not care about order withing each committee so perhaps you mean combinations, not permutations C(8,5) = 8! /[ 5! (8-5)! ] = 8*7*6/[3*2] = 56
March 29, 2016

Geometry
w L = 500 L = 5 w/4 w(5w/4) = 500 w^2 = 400 w = 20 L = (5/4)20 = 25
March 28, 2016

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