Monday
May 2, 2016

Posts by Damon

Total # Posts: 26,149

Math Exponetial Function Problem Question?
You multiply the 27 by the amplitude, not the log of the amplitude. then take the log of the new bigger amplitude for the new Richter number.
January 2, 2016

Math Exponetial Function Problem Question?
No, log scale I answered this yesterday http://www.jiskha.com/display.cgi?id=1451681946
January 2, 2016

Spanish
whew :)
January 2, 2016

Math
I did this not long ago http://www.jiskha.com/display.cgi?id=1451681946
January 2, 2016

Math
hint here: http://www.jiskha.com/display.cgi?id=1451675195
January 2, 2016

Math
You are welcome.
January 2, 2016

Math
Suspect you mean 2^(2x+3) = 80 that means (2x+3)log 2 = log 80 (2x+3) = 6.32192 2x = 3.32192 x = 1.6609
January 2, 2016

Math
19 * 100 / 27 = 70 % is his score in percent. I do not know if you are using letter grades or whatever.
January 2, 2016

Math
I think your answer is fine. So is the 3^2 = 9 one.
January 2, 2016

Math
well 9^x = 3^(2x) so log^-1 (2 x log 3) is a perfectly good answer. So is Log^-1(xlog(9)) They are the same :)
January 2, 2016

Math
Yes, but count brackets. I try to use different ones log^-1[ x(log 7 - log 8) ]
January 2, 2016

Calculus
It is just that sqrt (a^2-b^2) is not a - b
January 2, 2016

Calculus
By the way, you tried x^3 as well :..... sqrt (1-x^6) into 1^(1/2)- x^(3) ..."
January 2, 2016

Calculus
Why should I not let u = anything I choose ? LOL I see an x^6 and an x^2 so I tried x^3
January 2, 2016

Calculus
sin^-1 u + c so sin^-1 x^3 + c
January 2, 2016

Calculus
sqrt (1-x^6) into 1^(1/2)- x^(3) I do not think so I will try the easy way u = x^3 du = 3 x^2 dx so I have du/ sqrt (1-u^2)
January 2, 2016

Calculus
B and D
January 2, 2016

Calculus
In C, that nasty x cancels
January 2, 2016

Calculus
the problem with B and D is that dx = dy/f(x) so the substitution does not get rid of the x
January 2, 2016

Calculus
I had trouble with B and D
January 2, 2016

Calculus
∫√(x^2-1) dx <---- NOTE that dx let y = x^2-1 then dy = 2 x dx so dx = dy/2x ∫√(x^2-1) DX =∫y^.5 dy/2x a mess again
January 2, 2016

Calculus
You are wrong. A CAN easily be solved Be sure to include the dx in your integrals so you include it when you substitute
January 2, 2016

Calculus
B. let y = 1 - x^2 dy = -2 x dx ∫1/√(1-x^2) dx = ∫y^-.5 dy/(-2x) very awkward Hey be sure to include the dx in your integrals C will be easy because the x in -2xdx cancels
January 2, 2016

Calculus
A. let y = x-1 dy = dx ∫√(x-1) = ∫y^.5 dy that works
January 2, 2016

Calculus
You are welcome.
January 2, 2016

Calculus
∫(x^3-x^2) dx/x^2 =∫(x^3/x^2-x^2/x^2)dx = ∫(x^3/x^2-x^2/x^2)dx = ∫(x-1)dx = (x^2/2) - x + c which is the fourth option and is also what you got
January 2, 2016

spanish
If you are not sure and you are taking Spanish, we have a serious problem here :)
January 2, 2016

spanish
Lives in a hotel and is rich and spends much money Does not respect Mexicans or appreciate their clothes. But, interestingly Peace Corps volunteers must come from a different country entirely :)
January 2, 2016

World Civilizations
Of course there was introducing the natives to Christianity. I do not think I will follow that train of thought further and have deleted a sentence or two.
January 2, 2016

Physics of ice skating
Well, I guess the skate you are pushing with is at an angle so the long sharp edge can get a grip on the ice while the forward skate moves forward straight ahead. I had never thought about it but that is the way you skate although 45 degrees seems kind of extreme. If you look ...
January 2, 2016

Hmm, I can not help
... but if you do get help, let me know. We have three dogs that desperately need training. Luckily they are tiny.
January 2, 2016

clickable link I hope
http://en.wikipedia.org/wiki/Pacific_Route
January 2, 2016

Social Studies (Check, Please!)
I might go a bit further and claim that Russia would have collapsed without the convoys to Murmansk and to their Pacific seaport Vladivostok. https://en.wikipedia.org/wiki/Pacific_Route
January 2, 2016

Math
c * 11.5 + p * 13 = 1255 c + p = 100
January 2, 2016

math
You are welcome.
January 2, 2016

math
For example: Boole was appointed to the chair of mathematics at Queens College, Cork in 1849. In fact he made an application for a chair in any of the new Queen's Colleges of Ireland in 1846 and in September of that year De Morgan, Kelland, Cayley, and Thomson were among ...
January 2, 2016

math
http://www-history.mcs.st-andrews.ac.uk/Biographies/Boole.html
January 2, 2016

Math
No problem. You are welcome.
January 2, 2016

Math
Angle at C is common to triangles ACD and to ACB since angles in both triangles add to 180, angle ADC = twice angle ABD call angle CAD = T then BAD = T call angle ABD = A then angle ADC = 2A then sin T / 6 = sin 2A /x sin 2T / 11 = sin A /x sin T / 5 = sin (180-2A)/8 = sin 2A...
January 2, 2016

Physics
I did this a few days ago. http://www.jiskha.com/display.cgi?id=1451329598
January 2, 2016

maths
3/4*1/3 = 1/4
January 2, 2016

Calculus help plz
Thanks for figuring out what was meant. I just threw up my hands in frustration.
January 2, 2016

Calculus
Happy to help :)
January 2, 2016

Calculus Huh??
Is this supposed to be: ∫((cos^3(x)/(1-sin^2(x)) dx ?? 1 - sin^2 x = cos^2 x because cos^2 x + sin^2 x = 1 so you have ∫ cos(x) dx the derivative of the integral is what you already have, cos x the integral is sin x + c
January 2, 2016

Physics
m g = 2890 m g - 2200 = m (.36) You did not say what your question is but you can solve that for m and for the local g
January 2, 2016

Math
depends what you mean by intense. If amplitude is 27 times log A = 3.2 so A =1584 B = 1584 * 27 = 42792 log B = 4.63
January 1, 2016

mechanics
You are asking me to write a chapter in your text book. Any physics text can help you better than I can. for the first question: F = G Me m/r^2 = (GMe/r^2) m for changes in r that are small compared to earth radius, like from here to the top of Mt Everest this quantity is ...
January 1, 2016

physics
40 cycles / (8*60 seconds) = .083 Hz
January 1, 2016

Physics
How long to fall 46-1.8 = 44.2 meters ? 44.2 = (1/2) g t^2 t = sqrt (88.4/9.81) t = 3 seconds d = u t = 1.20 * 3 = 3.6 meters
January 1, 2016

Reposting calculus help plz
y dy = x dx + x^3 dx y^2/2 = x^2/2 + x^4/4 + c
January 1, 2016

mechanics
torque = moment of inertia * angular acceleration 40 * 0.20 = 30 alpha alpha = .267 radians/sec^2 omega = alpha * t omega= .267 * 4 = 1.07 radians/sec angle = (1/2) alpha *t^2 = .5 *.267 *16 = 2.136 radians divide by 2 pi = .34 revolutions torque * angle = work in = 8 * 8.53...
January 1, 2016

Maths
assume you mean 24 m not cm distance d from tree tan 45 = (24-h)/d tan 60 = h/d so (24-h)/tan 45 = h/tan 60
January 1, 2016

Maths/physics need help agn
up force from each student = 81 N = F cos 60 = F/2 so 162 N
January 1, 2016

Maths/physics
(1/2) m v^2 = (1/2) k x^2 .5 (1600) = .5 k (.04) k = 40,000 Newtons/meter F = k x = 40,000 (.2) = 8000 N
January 1, 2016

maths
area of brick = .25*.12 = .03 m^2 area of yard = 20*30 = 600 m^2 number of bricks = 600/.03 = 20,000
January 1, 2016

Math parentheses ?
do you mean 3 - x = sqrt (x^2 - 5) ?? if so 9 - 6 x + x^2 = x^2 - 5 6 x = 14 x = 7/3 = 2.33 x^2 - 5 must be + so |x| >/= sqrt 5 or 2.24
January 1, 2016

Calculus
hanging mass = 100 + 2 x F = g(100+2x) do dW = F dx from x = 0 to x = 20 W = g (100 x + x^2) at 20 - at 0 = g (2000 + 400) = g (2400) = 23520 Joules then from x = 0 to x = 10 g (1000 + 100) = 1100 g = 10780 Joules subtract I get 12740 Joules
December 31, 2015

Electric field
(1/2) m v^2 = q V m is electron mass q is electron charge (assume positive)
December 31, 2015

Trig
CSC (5PI/6) ?? 6pi/6 or pi is 180 degrees, the - x axis so we are pi/6 or 30 degrees above the - y axis the sin of that angle (150 deg) is 1/2 so the answer is 1/(1/2) or 2
December 31, 2015

physics
Torque = I alpha 5.2 * .8 = 1.4 alpha alpha = 2.97 radians/second^2
December 31, 2015

physics
The current now has three choices for where to go, but the voltage is the same for all three. itotal = V/R + V/r + V/R itotal = 3 V/R = V/(R/3) which is the voltage divided by the equivalent resistance, R/3
December 31, 2015

Science
The type of force is therefore electrostatic (Coulomb) force in the simple model of atoms.
December 31, 2015

Science
I am no chemist but those are all compounds between Hydrogen and halogens which desperately want to grab an electron to fill their outer shells so I would expect Hydrogen bonds where the Hydrogen partially gives up its sole electron.
December 31, 2015

Electric field
1 electron volt or 1.6*10^-19 Joule
December 31, 2015

physics
Coulomb's law: F = k q1 q2/r^2 E = force on unit charge E = F/1 = k q /r^2 = 9*10^9 * 8*10^-6 /4 1.8 *10^4 Newtons/Coulomb like charges repel so in direction away from positive charge
December 31, 2015

science and technology
assuming that the force is in the direction of the motion then: 80 * 24 = 1920 Joules
December 31, 2015

physics
(1/2) m v^2 = (1/2)(250) * 25 because 5^2 = 25 = 3125 Joules
December 31, 2015

physics kinematics
x is downstream y is across x velocity = -2 y velocity = 4 tan T = -2/4 T = 26.6 degrees from straight across or 90-26.6 = 63.4 from straight upstream magnitude = sqrt(4+16) = 2 sqrt 5 = 4.5
December 31, 2015

Math
(m b + n g) /(b+g)
December 30, 2015

Math
280(n+1) = 288 (n) 280 = 8 n n = 35 288 * 35 = 10080 seconds or 2.8 hours
December 30, 2015

math
LOL - only use positive root if above ground.
December 30, 2015

math
which is -r +/- sqrt(r^2+d^2)
December 30, 2015

math
d^2 = h^2 + 2 r h h^2 + 2 r h - d^2 = 0 quadratic h = [ -2r +/- 2 sqrt(r^2+d^2) ]/2
December 30, 2015

Physics
change in potential energy due to fall = m g (10+x) storage of potential energy in spring = (1/2) k x^2 so (1/2) k x^2 = m g (10 + x) you have everything, solve quadratic for x then: distance below bridge = 10 + x
December 30, 2015

100 kg bullet?
I assume a typo and bullet is 10 grams initial momentum of bullet and mass before collision = 500 * 10^-2 kg + 0 * 2 kg = 5 kg m/s the momentum just after collision will be the same with a mass now of 2.010 kg and speed v so 2.010 v = 5 calculate v from that now the pendulum ...
December 30, 2015

math
i and i+5 3(i+5) = 11 + i^2 3 i + 15 = 11 + i^2 i^2 - 3 i - 4 = 0 (i-4)(i+1) = 0 i = 4 or i = -1 try 4 then i+5 = 9 is 9 five more than 4, yes is 27 = 11 + 16 yes so 4 and 9 work try -1 i+5 = 4 is 12 = 11 + (-1)^2 yes so -1 and 4 work
December 30, 2015

Algebra I
-6(3x+1) ----------- 2 (3x+1) = -3
December 30, 2015

math
try 4 (5 + 6 g)
December 30, 2015

Precalculus- HELP!
hmmm think it means t = 33 + 7 sin [ (pi/12)(x-11) ] when x = 0 we have sin [-11 pi/12] which is - sin [11*180/12] = -sin(165 degrees) = -.259 so t = 33 - 7(.259) = 31.2 degrees F
December 30, 2015

science,physics
If you found this question in a physics book, watch the wording. If they asked for "distance", then Ms Sue told you how to do it. If they ask for "displacement", that is the magnitude of the vector between the start and the finish which is zero.
December 30, 2015

Math
1.3 * 6 * 160
December 30, 2015

math
lost 5 won 15 played 20
December 30, 2015

Math
k = m +7 3(m+7) + 5 m = 165
December 30, 2015

SOCIAL STUDIES
I thought it an extremely interesting article but wished it contained more details of garden construction. It was also somewhat disjointed and repetitive.
December 29, 2015

Math
The center has to be on the line y = x if the circle is tangent to the x and y axes. so center on 3 x = 3 y = 9 or (3,3) and the radius is 3 so (x-3)^2 + (y-3)^2 = 9
December 29, 2015

linear programming
p = number of printmasters s = number of speedmasters (1) vol = 10 p + 5 s < 2000 (2) wt = 5000 p + 600 s < 300000 maximize gain = g = 125000 p + 30000 s p on x axis , s on y axis do quadrant one vol line (0,400) to (200,0) wt line (0,500) to (60,0) find intersection ...
December 29, 2015

Chemistry
CuSO4 is 159.6 grams/ mol 5 M would be 159.6*5 = 798 grams/1000 mL so we need 79.8 grams to make 100 mL of 5M take one tenth of that solution, 10 mL and mix it with 90 mL of water to make 100mL of .5 M take one fifth of that .5 M solution which is 20 mL and mix with 80 mL of ...
December 29, 2015

Math
p + n = 90 but we know that p is 2 n so 2n + n = 90 or 3 n = 90
December 29, 2015

Math
p + n = 90 p = 2 n 3 n = 90 n = 30 p = 60
December 29, 2015

math
You are welcome.
December 29, 2015

math
(3/4) x = 3 1/2 3 x / 4 = 7/2 3 x = 14 x = 14/3 = 4 2/3
December 29, 2015

math
8 1/2 / 2 5/6 17/2 / 17/6 1/2 / 1/6 3
December 29, 2015

math
25 in urn 1 25 in urn 2 2 white - 3/25 * 10/25 2 red - 7/25 * 6/25 2 black - 15/25 * 9/25 add the results
December 29, 2015

maths physics chemistry
conservation of mass conservation of energy
December 29, 2015

basic mathematics
for the first draw 20 balls in the box for the second there are 19 the rest is obvious. For example both white ball one: 10/20 =1/2 ball two: 9/19 so (1/2)(9/19) = 9/38
December 29, 2015

Algebra 1 Solving Systems Using Elimination
I got (-2,6)
December 28, 2015

math
she drove home 390+70 You need to know the 70 the 164 was part of her vacation there.
December 28, 2015

Physics
fall 3300 m range = 9400 m speed = s u = constant horizontal speed = s cos 35 = .819 s if t is time in air then t = 9400 / .819 s = 11,474/s Vi = initial vertical speed = s sin 35 = .574 s z = altitude z = 3300 + Vi t - 4.9 t^2 ground is z = 0 so if t is the time in the air ...
December 28, 2015

history
Whoever your teacher is sure chooses some amusing alternative answers to questions !
December 28, 2015

chemistry, physics please help
That looks right to me although I call it latent heat of fusion.
December 28, 2015

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