Sunday
May 1, 2016

Posts by Damon

Total # Posts: 26,125

math
The top seems to be an arithmetic sequence and the bottom a geometric sequence, but I can not get that ratio to converge as i --->oo
January 25, 2016

maths
6 n + 4/n = 14 ??? 6 n^2 + 4 = 14 n 6 n^2 - 14 n + 4 = 0 3 n^2 - 7 n + 2 = 0 (3n-1)(n-2)= 0 n = 1/3 or 2 which do you think? Hint - try 2 then try 1/3 :)
January 25, 2016

Physics
work accomplished = 300*30 = 9,000 J applied work = 9,000 + 2,000 = 11,000 Joules efficiency = 100 * work accomplished/work applied = (9/11)100 = 81.8 % force applied = (300/6)/.818 = 61.1 N assuming that the 6 in your question refers to mechanical advantage
January 24, 2016

Algebra
Yes, sure :) BUT you did not need to ask because to be sure just put it back in 2 (3) + 3 (2) = ??? maybe 12 6 + 6 = YES
January 24, 2016

algebra
if + k is to the right, it is everything left of but not including -1 if k is up, it is everything below -1
January 24, 2016

Algebra
well, pick any old x, like for example x = 0 find y 0 - y = 9 y = -9 so (0 , - 9) now pick another x, like x = 1 3 - y = 9 y = 3-9 = -6 so ( 1 , - 6 ) and on and on until bored
January 24, 2016

math
I assume you mean compounded r = interest rate specified usually per year /4 because compounding every quarter year 18.5 years * 4 = 74 periods 3 = x^74 log 3 = 74 log x log x = .00644758 x =1.015 so 1.5 percent per period or r = 4*1.5 = 6%
January 24, 2016

math
Yes, I think that is the intent of the fuzzy phrasing :)
January 24, 2016

Pre-Calculus
50 72 45 (the 72 is 60+12) 32 45 12 ----------subtract 18 27 33 now being a navigator, I happen to know that a minute of latitude is a nautical mile so I would say 18*60 + 27 + 33/60 = 1107.5 NAUTICAL miles However do not tell you math teacher that :) we have 1107.5 Minutes of...
January 24, 2016

trig
one goes 60 km one goes 20 km the third side is 50 km divide them all by ten (similar triangle then law of cosines 5^2 = 6^2 + 2^2 - 2*6*2 * cos A 25 = 36 + 4 - 24 cos A -15 = -24 cos A cos A = .625 A = 51.3
January 24, 2016

English I guess
Specify subject so you do not get a physicist.
January 24, 2016

Physics
2 * 6.41 = 12.82 :)
January 24, 2016

Physics- HELP PLEASE!
F = k q1 q2 /r^2 all on 6 F = (k q6) q/r^2 let d = .15 meter due to 3 Fx = - (k q6) 3/d^2 negative direction because +and - Fy = 0 due to -2.4 repelling Fx = +(kq6) 2.4 /[ 2*(d)^2](sqrt2/2) Fy = same up due to -1 only up Fy = (kq6)9/ d^2 so Fx = -c 3/d^2 + c 2.4 *sqrt 2/4d^2 ...
January 24, 2016

math
26 miles ( 1 hour/175 miles) = .14897 hours .14897 hours * (60 minutes/1 hour) = 8.915 minutes .915 minutes ( 60 seconds/1 minute) = 55 seconds so 8 minutes and 55 seconds approximately.
January 24, 2016

Algebra
x and 83-x x - (83-x) = 24 2 x - 83 = 24 2 x = 107 x = 53.5 83.0 - 53.5 = 29.5
January 24, 2016

Grade 11 Functions
parabola, complete square -x^2/100 + 3x - 50 = p x^2 - 300 x + 5000 = -100 p x^2 - 300 x = - 100 p - 5000 x^2 - 600 x + (150)^2 = -100p+22,500 (x-150)^2 = -100 (p-225) vertex at x = 150, p = 225 so once again, 150
January 24, 2016

typo at start 150 is right
profit = 6x - x^2/100 - 50 - 3x p = -x^2/100 + 3 x - 50 dp/dx = 0 at max = -x/50 + 3 x = 50 * 3 = 150
January 24, 2016

Grade 11 Functions
whooops, you have not have derivatives parabola, complete square -x^2/100 + 6x - 50 = p x^2 - 600 x + 5000 = -100 p x^2 - 600 x = - 100 p - 5000 x^2 - 600 x + (300)^2 = -100p+85,000 (x-300)^2 = -100 (p-850) vertex at x = 300, p = 850 so once again, 300
January 24, 2016

Grade 11 Functions
profit = 6x - x^2/100 - 50 - 3x p = -x^2/100 + 6 x - 50 dp/dx = 0 at max = -x/50 + 6 x = 50 * 6 = 300
January 24, 2016

math
1.5 * 8/5 = .3*8 = 2.4 2.5 * 8/5 = .5*8 = 4.0
January 24, 2016

Calculus
1/3 - 1/sqrt 2 = (sqrt 2 -3)/3 sqrt 2 divide that by 2-9 = -7 (sqrt 2 -3)/-21
January 24, 2016

Physics II
m = mass of electron q = electron charge F = m a q E = m a a = q E/m v = Vi - a t v = 0 at stop so t = 5 * 10^5/a d = Vi t - .5 a t^2 .09 = 5*10^5 t - .5 a t^2 now the easy way :) if acceleration is constant the average speed during this stop is 2.5 *10^5 m/s it stops in .09 m...
January 24, 2016

Math
He works two and then four more for a total of six ? 2 + 4*4 = 18
January 24, 2016

math
a + ar + ar^2 ...+ ar^(n-1) a = 3 a r+ a r^2 = 60 r + r^2 = 20 r^2 + r - 20 = 0 (r-4)(r+5) = 0 r = 4 3 + 12 + 48 .... 3 * 4^(n-1)
January 24, 2016

physics
m (g - v^2/r)
January 24, 2016

physic
change of momentum = Force * time = 200 * s If you really mean for s seconds.
January 24, 2016

phy 231
horizontal problem: u = 338 cos 40.5 = 257 m/s x = u t = 257 * 8.09 h = Vi t - 4.9 t^2 where Vi = 338 sin 40.5 = 220 m/s h = 220(8.09) - 4.9 (8.09)^2
January 24, 2016

Been there - use d = v t
http://www.jiskha.com/display.cgi?id=1453604915 Yes, it is composite, so use d = v t which was part B and please use one name so I do not have to search all over for your earlier attempt.
January 24, 2016

Physics
initial momentum east = 3 * 1 - 5 * 2 = -7 so final momentum east = -7 I guess left is west, negative -7 = 3 * -1 + 5 * u 5 u = -4 u = 4/5 west
January 24, 2016

physics
Vertical problem: v = a t x = Xi + Vi t + .5 a t^2 here x = 0 Xi = 49.1 Vi = 0 a = -9.8 0 = 49.1 + 0 t - 4.9 t^2 so a) t = sqrt ( 49.1 m/4.9 m/s^2 ) b) v = -9.8 t c) u = 12.6 v = -9.8 t tan(angle from horizontal) =(v/u)
January 24, 2016

Physics
a = 710/275 v = a t t = 20 * 275 / 710 seconds
January 24, 2016

physics
assuming the weight is evenly distributed radius = .04 meters pi r^2 * P = 400 P = 400/.00503 = 79577 Pascals or about .8 atmospheres
January 23, 2016

Math
Area = 2400 ft^2 2400 (2/12) = 400 cubic feet(7.48 gal/ft^3 = 2992 gallons
January 23, 2016

Math
for P sin T is -1 when T = (3/4)(2pi) = 3 pi /2 for Q sin T then becomes +1 when sin T = 2 pi + pi/2 = 5 pi/2 ------------------------ now x for P 6 pi x = 3 pi/2 x = 1/4 and y is -2 now x for Q 6 pi x = 5 pi/2 x = (5/12) and y is +2 slope = 4/(5/12 - 1/4) = 4 / (5/12 - 3/12...
January 23, 2016

physics
F = 800 - 300 = 500 N a = F/m = 500/400 = 1.25 m/s^2
January 23, 2016

Math
so d = v t
January 23, 2016

Math
what is that x about? d is distance traveled k is hypotenuse 10 , not (10+x) is original distance leg k = sqrt (d^2 + 100) d = v t Is c) the dot product of k and d? I do not understand your notation If it is k dot d then that is |k| |d| cos angle between path direction and ...
January 23, 2016

Physics
m = mass of proton q = charge of proton During first E1 F = q E1 north a = q E1/m north vfinal = (q/m) E1 (14.8) x final = 0 + 0 +.5 (q/m)E1 (14.8)^2 = (q/m)E1 (110) Now during E2 x initial = 110 (q/m)E1 Vinitial = (q/m)E1 (14.8) x final = 0 so 0 = 110(q/m)E1 + 14.8(q/m)E1(8....
January 23, 2016

Math
Well, anyway, the Physics was easy :)
January 23, 2016

Physics
cool :)
January 23, 2016

Physics
By the way, of course they had the same momentum at rest.
January 23, 2016

Physics
That was intended to be a trick, confusing question, but you did not fall for it :)
January 23, 2016

Physics
work done = F * distance in this case the work done goes straight into increasing the kinetic energy F * d = increase in Ke same for both one to one the end.
January 23, 2016

Physics 30
To start: Potential energy of 3 kg box up .5 = m g h = 3*9.81*.5 14.72 Joules 3 kg hit floor point: Potential energy of 2 kg box now = 2 * 9.81 * .5 = 9.81 Joules SO 14.72 - 9.81 = 4.92 Joules is in the kinetic energy of the two moving blocks, m = 3+3=5 kg (1/2)(5)v^2 = 5 v = ...
January 23, 2016

physics
I bet her class uses g = -10 m/s^2 so it came out zero.
January 23, 2016

physics
And that one with the truck and the car bothered you ?
January 23, 2016

Calculus
W = (1/2) k x^2 where x is the stretch or compress length here x = .36 - .28 = .08 meter so 5 = .5 k (.0064) k = 1563 N/m so (1/2) k = 781 a) work to .34 - work to .32 subtract the .28 from both .06 and .04 = 781 (.06^2-.04^2) =1.562 J b) F = k x 15 = 1563 * x x = .00960 m = ....
January 23, 2016

Calc 1
The sin function range is between -1 and +1 1.7321 is not the sin of any angle.
January 23, 2016

Chemistry
6 g of M is 6/27 mol 23.66 g of Cl is 2/3 mol 2/3 = 14/27 so there are 14 Cl atoms for every 6 atoms of M ratio is 3/7 M/Cl M3Cl7
January 23, 2016

Math
there are 2 cups in a pint so 5 pints = 10 cups 4 cups/10 cups = 2/5
January 23, 2016

math
s = 3 c - 20 s = 180 - a c = 90 - a -------------subtract s - c = 90 so s = c+90 c+90 = 3 c - 20 2 c = 110 c = 55 then s = 145 s/c = 145/55 = 29/11 ================= check ================= 3(55)= 20 = 165 - 20 = 145 yes a = 90 -c = 35 180 - 35 = 145 yes
January 23, 2016

maths
4 c + 8 a = 380 c = a - 10 ==================== substitute (a-10) for c 4 (a -10) + 8 a = 380 12 a - 40 = 380 12 a = 420 a = 35
January 23, 2016

Physics
v = Vi - 9.81 t at top v = 0 so t = Vi/9.81 at top 34 = 0 + Vi t - (9.81/2) t^2 34 = Vi^2/9.81 - Vi^2 /(2*9.81) 34 = Vi^2/(2*9.81) Vi = 25.8 m/s
January 22, 2016

physics
momentum = m v = 1200 * 30 kg m/s Ke = (1/2) m v^2 = 600 * 900 Joules 30/2 = 15 v^2 = (1/2)30^2 = 900/2 = 450 so v = sqrt (450) = sqrt (9*50) = sqrt(3*3*5*5*2) = 15 sqrt 2 v = 21.2 m/s
January 22, 2016

Ms sue or damon pls help me with mathhhhhhhhhhhhh
9/12 = 3/4 foot 6/12 = 1/2 foot so Volume = 7 * 1/2 * 3/4 = 21/8 ft^3 (21/8) / 2.625 = 2.625/2.625 = 1 bag. I guess he built the box to hold one bag :)
January 22, 2016

physics
(1/2) m v^2 = .5 *10 * 16 = 80 Joules
January 22, 2016

engineering science
work = Force * distance in direction of force I do not see your picture but assume you are pushing 420 meters in the direction of the push W = 615 * 420 Joules
January 22, 2016

Calculus
parabola with vertex at x =-1 and y = 0 then proceeding right above and below the x axis passing through (0,1) and (0,-1) ∫ left of x = 0 = ∫ right of x = 0 because of symmetry we only need to do + y y = +/-sqrt (x+1) = +/-(x+1)^.5 ∫ y dx from -1 to 0 = &#...
January 22, 2016

physics
1. The mass in kg is mass PERIOD EVERYWHERE 2. The weight, or in other words gravitational FORCE is the mass times the local acceleration of gravity: F = W = m g on earth mg= 400*9.8=3920 Newtons on the moon g is about 1/6 g on earth so on moon mg = (1/6)*9.8*400=653 N
January 22, 2016

I do not know /unanswerable question
Because of the gear ratio between pedal and wheel rim I have no idea how fast her foot moves to make the bike go 8m/s. Different gears give different foot forces for the same bike speed.
January 22, 2016

Huh
What do you mean? Use parentheses.
January 22, 2016

math
x^2 - 3 x - 7/2 = 0 x = [ 3 +/-sqrt (9+14) ]/2 A = [ 3 + 23]/2 = 13 B = [ 3 - 23] / 2 = -10 (a) (x- A/B)(x-B/A) = 0 (x +13/10)(x+10/13) = 0 x^2 + (269/130) x + 1 = 0 130 x^2 + 269 x + 130 = 0 etc etc etc
January 22, 2016

Science
But you show Na O and Cl (but you show O as 0 Sodium Hypochlorite has oxygen in it, not zero) the only one left is H
January 22, 2016

Trigonometry
I assume you mean degrees and not minutes h is the height we want x is distance to the monument from the closer point tan 38 = h/x tan 32 = h/(55+x) x = h/tan 38 = 1.28 h tan 32 = h/(55 + 1.28 h) 34.4 + .8 h = h h = 172
January 22, 2016

Science
LOL, is it the filtered orange juice ? The answer is the only chemical element mentioned here, Hydrogen peroxide.
January 22, 2016

physics
I guess the boat is anchored? 6 m/2 s = 3 m/s Note: That is the speed of the crest or "phase velocity". The speed of the group of waves, the "group velocity" is (1/2) of that if they are deep water waves. Energy is propagated at the group velocity. In real ...
January 22, 2016

Algebra 2 pt 2
here is the height versus time t h = 70 + 150 t - 16 t^2
January 22, 2016

math
(7/8)(4/5) = (7/5)(1/2) = 7/10 = 0.7 yards^2 7/20 = 0.35
January 22, 2016

Algebra 2
here is the height versus time t h = 70 + 150 t - 16 t^2
January 22, 2016

Algebra 2
Well, who does feet any more but anyway in that system g = -32 ft/s^2 v = Vi - g t v = 150 - 32 t at the top, v = 0 so 0 = 150 - 32 t t = 4.69 seconds to the top h = Hi + Vi t - (1/2)gt^2 h = Hi + Vi t - 16 t^2 h = 70 + 150 t - 16 t^2 so at the top h = 70 + 150(4.69) -16 (4.69...
January 22, 2016

Algebra
k +(k+4) + 2(k+4) = 36 4 k + 12 = 36 4 k = 24 now you finish
January 22, 2016

science
change in L/L = 25*10^-6 (T-20) .1/80 = 1/800 = 25* 10^-6 (T-20) T-20 = 10^6/2*10^4 =50 T = 70 deg C
January 22, 2016

physics 1
cos 69 = h/8.7
January 21, 2016

Physics
2 pi radians/rev ( 2.5 rev /3.6 s) = 4.36332313 radians/second
January 21, 2016

math
I do not know if you mean -1 < -(1/5) x or -1 < -1/(5x) I will assume the first. 1 > (1/5)x reverse arrow when multiplying by negative quantity 5 > x or x < 5 ============ always check if x = 0 is -1 < -(1/5) 0 ????? yes -1 < 0
January 21, 2016

Math
a r^2 = 10 a r^6 = 6250 (10/r^2)r^6 = 6250 r^4 = 625 = 25*25 = 5*5*5*5 so r = 5
January 21, 2016

compounded errors :(
dF/dr = -2kr/r^4 = -2 k/r^3 so dF = (-2 k /r^3) dr
January 21, 2016

science, typo left k out
dF/dr = -2rk /r^2 so dF = (-2k/r)dr
January 21, 2016

science
by the way the difference in R between one side of earth is tiny compared to R If you have had calculus think: F = k/r^2 dF/dr = -2r /r^2 so dF = (-2/r)dr so you can calculate a small change in F due to a small change in r
January 21, 2016

science
I assume you can do F = G Msun Mman / R^2 but the tide is more complicated and depends on the moon. Look at: http://scijinks.jpl.nasa.gov/tides/
January 21, 2016

math
120 + 2 x = 180 x = 30 degrees for the other two angles cos 30 = (YZ/2)/6 cos 30 = yz/12 yz = 12 cos 30
January 21, 2016

math
(12/21)* 100
January 21, 2016

math
S = top + bottom + sides top = pi r^2 bottom = pi r^2 sides = 2 pi r h that will be in square inches (in^2) there are 144 square inches per square foot so S * 1500 / 144
January 21, 2016

Pre-cal
2 [ (b/2)+10 ] + b </= 100 b + 20 + b </= 100 2 b </= 80 b </= 40 so 40 cm
January 21, 2016

Chemistry
Iron must be wicked expensive where you live.
January 21, 2016

social studies
No problem, good luck :)
January 21, 2016

social studies
Not my thing, but I thought their thing was calendars.
January 21, 2016

Chemistry
Half as many O2 molecules produced as H2O2 molecules disintegrated
January 21, 2016

Calculus
no |-1| = 1
January 21, 2016

Physics
m g h / time 40 * 10 * 30 * .15 / 6 in Joules per second or watts
January 21, 2016

Woodrow Wilson
There are good things to say about him, but consider: http://www.nationalreview.com/article/345274/progressive-racism-paul-rahe
January 21, 2016

Science
He swung one of the bats with all his might, (but bunted with the other?)
January 21, 2016

Science
6. seems to be missing. I disagree about 8.
January 21, 2016

SCIENCE ASAP HELP PLEASE
NO !
January 21, 2016

SCIENCE ASAP HELP PLEASE
mass of earth = 5.98 * 10^24 kg Venus 4.82 * 10^24 radius of earth = 6.38 * 10^6 m Venus 6.31 * 10^6 for comparison: Jupiter mass = 1.89*10^27 kg and r = 7.18*10^7 m
January 21, 2016

Check 2 of my world history answers??
Please do. That is what it is about.
January 21, 2016

Check 2 of my world history answers??
Hoover was a modern Republican before his time. No way he would raise taxes or take over businesses. He decided to leave the problem to his successor. He was a good engineer though.
January 21, 2016

Check 2 of my world history answers??
Read John Steinbeck, "Grapes of Wrath".
January 21, 2016

Check 2 of my world history answers??
No, drought and resulting dust clouds over the plains caused by the farmland drying out and blowing in the wind was a major problem. I wonder what on earth "lack of stock available" means.
January 21, 2016

Math
(x+h)^3 = (x+h)(x^2 + 2 hx + h^2) = x^3 + 2 h x^2 + h^2 x + 1 h x^2 +2h^2 x + h^3 -------------------------- = x^3 + 3 h x^2 + 3 h^2 x + h^3 now subtract x^3 f(x+h) - f(x) = 3 h x^2 + 3 h^2 x + h^3 NOW let x = 1 :) = 3 h + 3 h^2 + h^3 ========================== Now I did that ...
January 21, 2016

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