Sunday
December 21, 2014

Posts by Damon


Total # Posts: 19,972

chemistry
mol of NO2 mass = 14+32 = 46 grams/mol mol of N = 14 100 * 14/46 = 30.4%
September 27, 2014

Algebra 2
There must be more to this problem than just (y-1)/(x+3) = -3/4 That is the equation of a straight line 4 y - 4 = -3 x - 9 4 y = -3 x - 5 y = -(3/4)x - 5/4
September 27, 2014

math
a60 = a1 + (59)(7) a60 = -15 + 413 = 398 S60 = 60 (-15 + 398) / 2 =11490
September 27, 2014

Math one question?
350 +225 ----- =575
September 27, 2014

physics
power stage v = Vi + a t v = 0 + 25 * 3.77 v = 94.25 m/s when fuel runs out h = 0 + 0 t + (1/2)(25)(3.77)^2 h = 177.7 meters high when fuel runs out Coasting stage, Hi = 177.7 meters and Vi = 94.25 m/s then at top v = 0 0 = 94.25 - 9.81 t t = 9.61 seconds coasting up h = Hi + ...
September 26, 2014

Pre-Calc
(f+g)(x) = x + x + 2 - 2 = 2 x do the others the same way
September 26, 2014

Science-HELP?
at least it works until the sea rises a little :(
September 26, 2014

Science-HELP?
sure, that works
September 26, 2014

physics
I answered that. http://www.jiskha.com/display.cgi?id=1411686019
September 25, 2014

Physics
Horizontal F = m v^2/r Vertical Fmax = m g + mv^2/r m g + m v^2/r = 1.16 m v^2/r g = .16 v^2/r .16 v^2 = 9.8(.7) solve
September 25, 2014

Match
162 + 284 is something like 140 + 300 which is 440 you don't need 98 to get to 500 from there
September 25, 2014

Math
http://davidmlane.com/hyperstat/z_table.html
September 25, 2014

Algebra 1
.91 = sum of first 6/6 so sum of first 6 =5.46 sum of first seven then is 5.46 + x so (5.46 + x)/7 >/= .92 5.46 + x >/= 6.44 so x >/= .98
September 25, 2014

Algebra 1
you can not just say less than 90 because you must include 90 therefore less than OR EQUAL TO 90
September 25, 2014

Algebra 1
Because It could be EXACTLY 80 or EXACTLY 90
September 25, 2014

Algebra 1
top will get 90 bottom will get 80 so what do you think?
September 25, 2014

math...
looks good to me.
September 25, 2014

physics
acceleration = change in velocity / change in time = (35 - 65) / 4.2
September 25, 2014

Physics
a = -9.81/4 = -2.45 m/s^2 0 = 6 - 2.45 t t = 2.45 seconds d = Vi t + (1/2) a t^2 d = 6 (2.45) - 1.23 (2.45^2) d = 7.31 meters
September 25, 2014

Physics
m v1^2/r = (9) m v2^2/r v2^2/v1^2 = 1/9 v2/v1 = 1/3
September 25, 2014

math
2. y + 2y + 3z combine like terms y + 2 y = 3 y so 3 y + 3 z B. 3y + 3z =================== Hey, you got the first one right. This is really no different 3. 6r + r - 5r (6+1-5)r = 2r A. 2r ========================= 4. 5x + 2(x + 6) is 5 x + 2 x + 12 or 7 x + 12 C. 7x + 12...
September 25, 2014

Physics
v1^2/r1 = v2^2/r2 v1^2/v2^2 = r1/r2 v1/v2 = sqrt (r1/r2)
September 25, 2014

Physics
weight = k r^3 drag = c r^2 v^2 at terminal speed, drag/weight = 1 drag/weight = const v^2/r so V1^2/R1 = V2^2/R2 V2^2/V1^2 = R2/R1 V2/V1 = sqrt (R2/R1)
September 25, 2014

Algebra
[(-3 x + 2 )(-2) -14 ]/6 [(6 x - 4 ) -14 ]/6 [6 x -18 ]/6 x - 3 write it down add three and you get x back :)
September 25, 2014

Calculus
f(x+h) = (x+h)^2 + x + h = x^2 + 2 h x + h^2 + x + h f(x) = x^2 + x slope = [f(x+h) - f(x) ]/h = [ 2 h x + h^2 + h ]/h = 2 x + h + 1 now at the point x = -1, h --->0 and slope = 2 x + 1 which is -2 + 1 = -1 so form of tangent is y = -1 x + b now what is y at x = -1 y = (-1...
September 25, 2014

Physics
assuming the current is perpendicular to the swimmer heading, it has nothing to do with the problem. It just means she will land somewhere downstream of the starting point. distance = speed * time = 0.4 * 200
September 25, 2014

Math
0.0034 move decimal point two places to the left to divide by 100 in ten based number system.
September 25, 2014

physics
dv = 4 pi r^2 dr note(surface area * dr) dv/v = 4 pi r^2 dr / (4/3) pi r^3 =3 dr/r
September 25, 2014

physics see question above
been there, done that
September 25, 2014

Physics
first drop the ball to see how long it is in the air 7.5 = 4.9 t^2 solve for t now horizontal problem u t = 9.5 u = 9.5 / t
September 25, 2014

physics
a + g = 7 + 9.8 = 16.8 m/s^2 F = 15 (16.8) = 252 N , bag tears
September 25, 2014

physic
F = k Q1 Q2 / d^2 where k = 9 * 10^9
September 24, 2014

physics
a = - 9.8 m/s^2 v = Vi + a t = 0 - 9.8 t h = Hi + Vi t -(9.8/2) t^2 0 = Hi + 0 (3) - (9.8/2)(3)^2 4.9 (9) = Hi Hi = 44.1 meters high
September 24, 2014

History on Middle Ages(PLEASE HELP NOW)
They had religious issues? I thought those were pre-decided in Rome :)
September 24, 2014

Math
well, surely x = -5 then y = 4
September 24, 2014

statistics
mean = 2.34 sd = .2 z = + or - .03/.2 look for probability of being within z = +/- .15 of mean
September 24, 2014

statistics
http://davidmlane.com/hyperstat/z_table.html
September 24, 2014

Physics MCAT, Help please
original momentum = 6 * 4 = 24 final momentum = 2 * 8 + V * 4 16 + 4 v = 24 4 v = 8 v = 2 m/s
September 24, 2014

Math
all components the same x i + x j + x k d = sqrt (3 x^2 ) = x sqrt 3 so if d = 1 x = sqrt(3) /3 so (sqrt 3/3)(i + j + k)
September 23, 2014

Science
(-4+8)/2 = 2
September 23, 2014

Physics
x = Xi + Vi t + (1/2) a t^2 4200 = 0 + 7.2 t + (1/2) a t^2 but t = 4 * 60 = 240 seconds so 4200 = 7.2(240) + .5 a (240)^2 solve for a then v = Vi + a t v = 7.2 + a (240)
September 23, 2014

math
(.2)gal/.08 shed = 2.5 gal /shed 2.5 gal/shed * 4 sheds = 10 gallons
September 23, 2014

Math
-1^3 = -1 (--2^4) = -2^4 = -16 5*-1*-16 = 80
September 23, 2014

Math
4.5 * 175/3
September 22, 2014

math
she painted 3/4 of 1/3 = 1/4 of the total wall what was left is 1/3 -1/4 = 4/12 -3/12 = 1/12 is bare still
September 22, 2014

physics
100 + 273 = Th 60 + 273 = Tc 100 * (Th-Tc)/Th
September 22, 2014

Physics HUH ????
Perhaps mass 2 is hanging from a pulley on earth and mass one is sliding on a frictionless horizontal table? If so force = m2 g mass accelerated = (m1+m2) F = m a m2 g = (m1+m2) a
September 22, 2014

Math
14+2m = 4m - 16 subtract 2 m both sides 14 = 2 m - 16 add 16 both sides 30 = 2 m multiply both sides by (1/2) 15 = m ================================ 4(x +2) = 14 - 2(3 - 4x) 4 x + 8 = 14 - 6 + 8 x 8 + 6 = 14 + 4 x 0 = 4 x x = 0 =========================== Eight subtracted ...
September 22, 2014

Basic English - can not see underlines
"for" in "for all" is one if underlined
September 22, 2014

college physics
average speed during crash = 3.75/2 so time to stop = .794 / (3.75/2) acceleration = change in speed / change in time or a = (0 - -3.75) / [.794 / (3.75/2) ] and F = m a = 52.2 a
September 22, 2014

English
6. Do you mix father up with turpentine before you paint? Perhaps: Father and I are going to paint the walls. 10. Does the janitor's office fit in the garbage can? Perhaps: I am going to throw garbage into the garbage can near the janitor's office.
September 22, 2014

What is the degree of this polynomial?
You are welcome :)
September 22, 2014

What is the degree of this polynomial?
1+2+3+2 = 8
September 22, 2014

math
50*20 = 1000 square feet so we use 1680/1000 = 1.680 ft on pool 1.680 * 12 = 20.16 inches used but there is an easier way 30 in * (2100/1000) * .4*.8 = 20.16 in
September 21, 2014

math
1/8 + x = 1/4 x = 1/4 - 1/8 x = 2/8 - 1/8 x = 1/8 but I bet you already knew that 1/8 + 1/8 = 1/4 :)
September 21, 2014

Physics
that is what you said. A mass of 10 kg is a weight of 98.1 Newtons
September 21, 2014

Physics
weight = 10 * 9.81 = 98.1 Newtons = normal force max friction force = .3 * 98.1 Newtons Of course we are not allowed to push down on it :)
September 21, 2014

Hey, I just did this
but here is another reply from another teacher http://www.jiskha.com/display.cgi?id=1202595476
September 21, 2014

PHYSICS
LOL, again ? R = A V = L^2 L/T P = F/A = m L/T^2 / L^2 P = m L/ (T^2L^2) m = rho L^3 P = rho L^3 /(T^2 L) P = rho L^2/T^2 = rho v^2 4 by the way this does not give us the sign and rho is M/L^3 but is constant in the usual incompressible fluid problem
September 21, 2014

Physics I
v = Vi + a t here v = Vi - 9.81 t
September 21, 2014

Physics I
our acceleration is 9.81 DOWN, negative so our UP speed decreases g = -9.81 m/s^2 gravity does not push UP no matter if you are going up or down
September 21, 2014

Physics I
aaarrrggghhhh !!!! g is g is g is g = -9.81 m/s^2 so d when you throw a ball up, its speed up decreases until it stops ! The acceleration is 9.81 down until it comes back down and hits the ground.
September 21, 2014

Physics
u = 15 forever Vi = -20 h = Hi + Vi t + (1/2) a t^2 0 = Hi - 20 t - 4.9 t^2 but t = 4 so solve for Hi, initial height in 4 seconds at 15 goes 60 meters where is the basket at 4 seconds? h basket = Hi - 80 d = sqrt (60^2 + h basket^2)
September 21, 2014

physics
u = 22 cos 53.6 forever Vi = 22 sin 53.6 v = Vi - 9.8 t at top v = 0 0 = 22 sin 53.6 - 9.8 t solve for t, time to top h = 0 + Vi t - 4.9 t^2
September 21, 2014

physics
u = horizontal speed = 14.9 forever now vertical problem, simply drop from 7.05 m -h = -(1/2)gt^2 7.05 = 4.9 t^2 t = 1.2 seconds to fall how far horizontal in 1.2 seconds? x = 14.9 * 1.2
September 21, 2014

Algebra
average base = (3b-4+b)/2 = 2b-2 (2b-2)(b/2) = 210 b^2-b-210 = 0 (b-15)(b+14) = 0 b = 15 3b-4 = b/2 =
September 21, 2014

physics
t1 = 280/88 t2 = 210/75 all south so v average south = (280+210)/(t1+t2)
September 21, 2014

physics
change in x speed = 6.5 cos50-4.2cos34.5 change in y speed = -6.5 sin50-4.2sin34.5 ax = change in x speed/2 ay = change in y speed/2 a = sqrt (ax^2+ay^2) A = angle of a above horizontal tan A = ay/ax
September 21, 2014

physics
Vi = 0.43 v = Vi + a t v = 0.43 + 3(5)
September 21, 2014

physics
That is half a g for 5 minutes, way too gigantic but anyway v = Vi + a t here t = 5 * 60 = 300 seconds
September 21, 2014

physics
a = change in velocity / change in time = (6.5 -1.2)/25
September 21, 2014

statistics
http://davidmlane.com/hyperstat/z_table.html
September 21, 2014

physics
Boat 1 north velocity as seen from boat 2 = boat 1 north speed - boat 2 north speed 2.2 cos 47 = .745 - boat 2 north Boat 1 east as seen from boat 2 = boat 1 east - boat 2 east 2.2 sin 47 = 0 - boat 2 east
September 21, 2014

Math-HElP PLEASE??
2.25a + 1.75(300-a) = 613.5
September 21, 2014

physics
(1/2) m v^2 = m g h A.) v = sqrt (2 g h) = -sqrt (2*9.8*1.95) negative because down B.) (1/2)m v^2 = m g h or v = sqrt (2*9.8*1.87) positive because up) C.) change in velocity = (magnitude Part A + magnitude part Part B) divide that by .08 to get acceleration up D.) (1/2)(a ...
September 21, 2014

Math
is 111 prime? nope, 1,3, 37, 111 but 111 is certainly a factor of whatever our answer is 111*1 or 2 or 3 or whatever up to 9 so 3, 37 and what? How about 7 ? 777 = 7 * 3 * 37 10+37 = 47 sure enough
September 21, 2014

history
Shortage of supply over much of the Arabian Peninsula?
September 21, 2014

physics
U = 15 forever so d = u t now find t, time to fall 125 m 125 = 4.9 t^2 t = sqrt (125/4.9)
September 21, 2014

Chemistry
I agree with that.
September 21, 2014

Chemistry
You are welcome.
September 21, 2014

Chemistry
66.6 yards * 36 in/yard * 2.54 cm/in = L 12 in * 2.54 cm /in = w volume = w * L * t so 2.7 grams/cm^3 * w * L * t = 830 grams solve for t
September 21, 2014

physics
g is g is g
September 21, 2014

Algebra
(10 x + y) y = 2 + 4 x 13 + 3 (10 x + y) = (10 y + x) 13 + 30 x + 3 y = 10 y + x 29 x + 13 = 7 y = 7 (4x+2) 29 x + 13 = 28 x + 14 x = 1 then y = 4x+2 = 6 so 16
September 21, 2014

physics
1100.2 = 550 550 = (1/2) a t^2 550 = .5 * 1.2 * t^2 t = 30.3 seconds to go halfway (same for the second half) v = a t = 1.2 * 30.3 = 36.3 m/s 2 t = 60.6 seconds
September 21, 2014

physics
The vertical problem is the same for both Vi = 0 a = -9.8 until it stops Hi = 3.8 v = 0 + a t = -9.8 t h = 3.8 + 0 t - 4.9 t^2 when h = 0, the floor 4.9 t^2 = 3.8 t = .88 seconds in the air for both v at floor = -9.8 (.88) = - 8.62 m/s first ball straight down, x = 0 second ...
September 21, 2014

Physics
0 = 18 - 1.8 t t = 10 seconds to stop how far braking? d = av speed * time = 9*10 = 90 meters 125 - 90 = 35 meters before braking 35 meters / 18 meters/second = 1.94 seconds (best hurry)
September 21, 2014

science
P1 Vi = P2 V2 10(20) = P2(5) P2 = 40
September 21, 2014

Physics
surface area of sphere = 4 pi r^2 Watts/unit area at 15 m = 1.75/(4*pi*225)
September 21, 2014

Physics
d instructor = u t find t so you can find d, how far the instructor is from directly under when you drop. H = height H = (1/2) g t^2 t = sqrt (2 H/g) so d = u sqrt (2 H/g)
September 21, 2014

chemistry
125 (95-20)(4.184) Joules divide by 1000 to get kilojoules
September 20, 2014

physics
Calculate the total distance calculate the total time average v = distance/time
September 20, 2014

Math (Proving of Inequalities)
a^2-b^2 = (a+b)(a-b) (a+b) is + so if (a^2-b^2) is + then (a-b) must be +
September 20, 2014

5th grade Math
multiply (2/3) 3 = 2 cups (2/3) 1/2 = 1/3 t (2/3) 3/4 = 1/2 cup (2/3) 4 = 8/3 = 2 2/3 cup (2/3) 2 = 4/3 = 1 1/3 T
September 20, 2014

PHYSICS
G .35 Mb m/Ra^2 = G Mb m / Rb^2 .35 Mb/Mb = Ra^2/Rb^2 Ra/Rb = sqrt(.35)
September 20, 2014

physics
well in this case the result is exact, but in general there could be a constant of proportionality between the output and the input that we could not get from dimensional analysis for example Force on a plate of area A in a fluid of density rho in kg/meter^3 and speed v in L/T...
September 20, 2014

physics
R = v A (look at a drawing of what you have here) now the way you are supposed to do it v = L/T A = L^2 R = L^3/T = (L/T)L^2 so R = L A/T but L/T = v so R = v A
September 20, 2014

chemistry
2 mol of water --> 2*18 g 1 mol O2 --2*16 g (2*18/2*16) * 7.4 mg = 9*7.4/8 = 8.325 mg 7400 grams O2 ---> 8325 grams H2O ---> 8325 mL H2O or 8.325 liters
September 20, 2014

HELP IN SCIENCE ASAP!!
yes, yes
September 20, 2014

Science
You mean 10 m/s^2 I assume wow, 1 g for five minutes ? to the moon ? anyway 5 min = 300 s v = Vi + a t v = 0 + 10 (300) = 3000 meters/second
September 20, 2014

Science
yes, yes
September 20, 2014

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