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March 29, 2017

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Posts by Damon

Total # Posts: 29,637

word problem
L = 4w+9 if L = 85 w = 76/4 = 19 if L = 49 w = 40/4 = 10 10</= w </= 19
February 26, 2017

physics
The mass has nothing to do with this problem since acceleration is not asked for F = k (2q)q/.1^2
February 26, 2017

physics
work = force * distance = q E d = change in potential energy = qV 48 = .1 V
February 26, 2017

physics
forces on q1 attractive k =10^-12* usual k to account for ? force in direction of Fq3=k(8)/.4^2 force in direction of Fq2=k(6)/.4^2 force perpendicular to opposite side Fy= Fq3 cos 30 + Fq2 cos 30 force parallel to opposite side Fx= Fq3 cos 60 - Fq2 cos 60 F = sqrt(Fx^2+Fy^2) ...
February 26, 2017

math
Does he pay at the beginning of the year or the end?
February 26, 2017

Math
y = k x 6 = 3 k k = 2 y = 2 x 2/3 = 2 x x = 2/6 = 1/3 ================= 25 = m (1.25) so m = 25/1.25 a = F/m = 35 /(25/1.25) = 1.25 * (35/25)=1.75 You could have written that down immediately by proportions but: 1. I am a physicist 2. You are doing algebra of direct variation.
February 26, 2017

Chemistry
2 * 6.49 * Avogadro's number which is about 6.02*10^23
February 26, 2017

Math
I can get it in powers of cos but not first power sin^8 = sin^2 * sin^2 *sin^2 *sin^2 but sin^2 = 1 - cos^2 sin^2*sin^2 = 1-2cos^2+cos^4 (1-2cos^2+cos^4)^2 = 1-4cos^2x+6cos^4x-4cos^6x+cos^8x
February 26, 2017

Sorry, misread it
assumed x with 3
February 26, 2017

Pam
If you do not do calculus you complete the square x^2 - 3 = y x^2 - 3 + (3/2)^2 = y + 9/4 (x-3/2)^2 = y+9/4 vertex at (3/2 , -9/4)
February 26, 2017

Math
6.848*10^9 people .22*57.9 *10^6 miles^2 so [ 6.848/(.22*57.9) ]10^3 =.5376 * 10^3 = 538
February 26, 2017

Pam
( 1,000,000 , 1,000,003 )
February 26, 2017

Pam
LOL - looks like = x to me, the 3 is tiny Perhaps she means where the slope is zero? dy/dx = [(x+8)(2x+11) -x^2-11x-16)]/bottom^2 where is numerator = 0? 0 =2x^2+27x+88-x^2-11x-16 0 = x^2 + 16 x + 72 complex roots :( none
February 26, 2017

mATH..OHHHH NOOOOO PLEZ HELP I AM STRUGGLING
In this link which MsSue gave you will find: http://www.mathsisfun.com/quadrilaterals.html That a square is also a rectangle and a rhombus.
February 26, 2017

if a square, then a rhombus
a square has 4 equal sides, so does a rhombus however a square has 90 degree corners a rhombus could have 90 degree corners, but not necessarily. therefore If a square, then a rhombus If a rhombus, maybe a square In other words, a square is a special case of a rhombus
February 26, 2017

mATH..OHHHH NOOOOO PLEZ HELP I AM STRUGGLING
Try to draw a square that is not a rhombus
February 26, 2017

word problem, please help
41 = 25 + 4 t 16 = 4 t t = 4 so t>/= 4
February 26, 2017

physics
Vi = 180,000 meters/3600 seconds average speed during deacceleration= Vi/2 distance = (Vi/2)* 20 = 10 Vi
February 26, 2017

Algebra
a (x-2)(x-3) = 0 a[ x^2 -5x + 6 ] = 0 f(x) = a[ x^2 -5x + 6 ] when x = 1 f(1) = 12 = a[ 1-5+6] 12 = 2 a a = 6 so f(x) = 6x^2 -30 x + 36
February 26, 2017

math
prob jeff not = 1/4 prob Justin will = 2/5 the two events are independent so (1/4)(2/5) = 1/10
February 26, 2017

math
letters a through z. There are 26 on my keyboard order matters so permutations of 26 taken 4 at a time = 26!/[22!]= 26*25*24*23 10 numbers (0 through 9) again order matters = 10!/8! = 10*9 so in the end 10*9*26*25*24*23
February 26, 2017

Algebra
new salary = x = 1s + .093 s so x = 1.093 s
February 26, 2017

?hours?
proofread how many hours?
February 26, 2017

Science
Normal force is indeed 810 mass = normal force /g = 810/9.81 = 82.57 kg but it depends what your class uses for g. I use 9.81 but some classes even use 10m/s^2 (I guess they live on a slightly more massive planet :)
February 26, 2017

Math
3x >/= -6 x>/= -2
February 26, 2017

Math
You are welcome.
February 26, 2017

Math
6 > 10 z - z^2 well if z = 0, the right hand side is 0 and 6 is > 0 so A works by the way, the others do not work ;)
February 26, 2017

Science
If the speed is constant and the cable is horizontal then the friction force equals the tension, 60 N The normal force is m g = 15.0 * 9.81
February 26, 2017

Science
Hard to say since I have no idea where point A is.
February 26, 2017

Social Studies
Then I would indeed pick A. However B was also true of many Germans and played a part in the rise of Adolph Hitler.
February 26, 2017

Social Studies
2. I think A AND B
February 26, 2017

Social Studies
1. NOT C, yes to the others
February 26, 2017

Algebra
x along river and y 600 = x + 2y so x = 600-2y A = x y A = (600-2y)y = 600y - 2y^2 I assume you do not know calculus so complete square to find vertex of parabola. y^2-300 y = -A/2 y^2 -300 y+(300/2)^2 = -A/2 + 150^2 (y-150)^2 = -(1/2) (A-45,000) vertex at y = 150 and A = 45,...
February 26, 2017

College Algebra
.05x +.06(10,000-x) = 550 .05 x + 600 -.06 x = 550 50 = .01 x x = 5000
February 25, 2017

Need mass
say m normal force m g Friction force = .5 mg so T - .5mg = m a T = m (1 + .5g) = 5.9 m
February 25, 2017

Math
first one wrong (1/3)base area*height second one wrong, same formula third one wrong, same formula again I have no idea what the bottom 2 are about.
February 25, 2017

Math
the volume of anything pointy with straight sides = (1/3) base area * height
February 25, 2017

science
Well, we will run out of fossil fuel first of all. It is by definition not "long term" because we are using it up faster than plants are turning into coal and oil and even gas. However there are more immediate obvious problems such as air pollution and land pollution...
February 25, 2017

Physics help please
If it is exactly the same distance from each speaker then there is no difference in path length between the two paths and the signals superimpose to give a maximum.
February 25, 2017

do not do magic
we do not see your figure or line of reflection.
February 25, 2017

PHYSICS
m a = 520*2 = 1040 N third law ---> -1040 N net force on car = car mass * car a = 1400 * 2 = 2800 N the tires exert 1040 N more on the road to accelerate the trailer, but that is not what you asked :)
February 25, 2017

math
try common factor 2 182/3 60 2/3
February 25, 2017

PHYSICS
If it moves with constant V the forces add to zero. to counter first Fx = -6.2 N to counter second Fy = +5 N |F| =sqrt(5^2 + 6.2^2 ) = 7.96 N quadrant II tan T = 5/-6.2 T = 180 - 38.9
February 25, 2017

MAthematicas
slope of x = 1 is anything/0 which is UNDEFINED
February 25, 2017

Algebra 2
easy way g = [(x-3)/2 ] ??? g(1) = [(1-3)/2 ] = -1 f(-1) = 1-3+6 = 4 --------- hard way f(g)=[(x-3)/2]^2+3[(x-3)/2 ]+6 put in x = 1 f(g)=[(1-3)/2]^2+3[(1-3)/2 ]+6 = 1 -3 +6 = 4
February 25, 2017

Algebra I
zero when x = 1, always + elsewhere 2 x^4 would be symmetric about y axis HOWEVER the -8x adds a sloping line to that which destroys that symmetry so not symmetric about any of them
February 25, 2017

Math
Why could he not be 877.375 meters high? Integer means 877 or 878
February 25, 2017

MATH
x = 3 has no y axis intersection. It is a vertical line through x = 3, no solution , no relation , no way :)
February 25, 2017

Geometry
I assume D is on AB? Is it an altitude hitting AB at 90deg ? if so A is 60 and B is 30 then CD = 8 sqrt 3 AC = 16 AB = 32 BC = 16 sqrt 3 so perimeter = 48 + 16sqrt3
February 25, 2017

Algebra
80 a +200 b = 160 *20 = 3200 and a + b = 20 so b=20-a 80 a + 200(20-a) = 3200 80 a + 4000 -200 a = 3200 120 a = 800 12 a = 80 a = 6 2/3 pounds so b = 20-a = 13 1/3 pounds
February 25, 2017

math
no, not distributive property of multiplication If the question were (5x+3)(8x+1) no plus sign, so TIMES then you could say 5x (8x+1) + 3 (8x+1) That would be distributive property.
February 25, 2017

math
You do not show any multiplications or divisions in your given problems. All you can do is collect like terms. (5x+3)+(8x+1) is the same as 5x+3+8x+1 which is 13 x + 4 =========================== similarly (2t^2-3t)-(7t^2-5t) = 2 t^2 - 3 t - 7 t^2 + 5 t Note that +5 t due to ...
February 25, 2017

Algebra 2
you do not have either + or - 3.57 people
February 25, 2017

Math
A. y = -2x/3 + 4 B. goes through (0,-2) and (3,0) (0+2)/(3-0) = 2/3 = (y+2)/(x-0) y+2 = 2x/3 2x -3y = 6 C. y = -3 x + b 2 = -3(1) = b b = 5 y = -3x + 5
February 25, 2017

Trig identies, Calculus
use x^2-y^2 = (x+y)(x-y) c^4-s^4 = (c^2+s^2)(c^2-s^2) = 1 (c^2-s^2) = c 2x
February 25, 2017

matrix, linear transformations
first h*g 4 12 0 6 then k * h*g 0 6 4 12 in detail h * g |1 2| | 4 0 | |4 12| |0 1| | 0 6 | |0 6 | then |0 1| |4 12| |0 6 | |1 0| |0 6 | |4 12|
February 25, 2017

Calculus
I agree because as x increases the integral decreases.
February 24, 2017

you mean 3/4 I assume
cos is - in quad two sin^2 T + cos^2 T = 1 9/16 + cos^2 T = 16/16 cos^2 T = 7/16 cos T = -sqrt 7/ 4 agree with you
February 23, 2017

Math
but what is 28/4 !!!! ???? LOL
February 23, 2017

Chemistry
do the silver one first Ag 108 g/mol Cl 35.5 g/mol AgCl = 143.5 g/mol so 5.57 g AgCl has (108/143.5)5.57 = 4.19 g of Ag so 8.12 g stuff has 4.19 g Ag so 4.72 g stuff has 2.44 g Ag so we have 4.72-2.44 = 2.28 g of C and H we got 7.95 g of CO2 C = 12 g/mol O2 = 32 g/mol CO2 = 44...
February 23, 2017

Precal
Actually I just used the trig identity tan = sin/cos same difference :)
February 23, 2017

Precal
sqrt(5) / 2
February 23, 2017

Chemistry
Oh, that Einstein guy again? how much energy in a photon of wavelength 902 nanometers ? approx 900*10^-9 = 9*10^-7 meter L f = c 9*10^-7 f = 3*10^8 f= (1/3) * 10^15 E = h f E = 6.6*10^-34 * (1/3)*10^15 E = 2.2 *10^-19 Nope not quite strong enough to spring an electron free.
February 23, 2017

chemistry help, urgent!
Google buffer
February 23, 2017

Math
B. does it have constant slope? (-1+5)/(0+2) = 4/2 = 2 ((1+1)/(1-0) = 2/1 = 2 (3-1)/(2-1) = 2/1 = 2 :) slope, m = 2) C. y = mx + b so y = 2x-1 D. y = 2(10)-1 = 19
February 23, 2017

physics
m * v = 8.0 m * 10 = 8.0 m = 0.8 kg (about a pound)
February 23, 2017

NO
4. It would be correct if you typed it correctly 5.1 * 10^-8 Your answer is nonsense. the ^ symbol means "to the power" or superscript 5. Nonsense again 10^12 (Please learn to type exponents) is smaller than ANYTHING * 10^13 or 14 or 21 or whatever bigger than 12 ...
February 23, 2017

math
1. -10 * -1 = 10 2. doubles to * 2 at 4 doubles to * 4 at 8 doubles to * 8 at 12 8*90 = 720 3. No because not a power of ten. Your answer is wrong 4.8 IS between one and ten 1007 is NOT a power of ten. Perhaps 10^7 ????
February 23, 2017

Math
Sketch a graph ! I notice a dip for example.
February 23, 2017

Math
multiply everything by 2 -6 + n = 18 so? add 6 to both sides
February 23, 2017

Engineering Science N4
at the point where it has acceleration = a and velocity = 0, I assume the static friction rules. normal force = m g - F sin 15 friction force = .4(mg-F sin 15) pull force horizontal = F cos 15 so Fcos15 -.4(mg-F sin 15)= m a
February 23, 2017

math help asap
Oh come on 15/10 = ? 24/16 = ? 30/20 = ?
February 22, 2017

Educational Technology
I am using library, school and other computers around town being very busy with local political issues. I google in to answer a question once in a while but usually do not remember to write my name in above.
February 22, 2017

Hey, we did the one with the copies
Your turn.
February 21, 2017

Algebra
machine 1 does n copies/170 min so n/170 copies/min machine 2 does n/119 copies/min so n = (n/170 + n/119) t 1/t = 1/170+1/119 = .014286 so t = 70 min
February 21, 2017

math
0 = -32 t + 28 so t = 28/32 google projectile motion in English units (acceleration of gravity = -32 ft/second^2)
February 21, 2017

Math
LOL, anywhere else !
February 21, 2017

Algebra
n and n+32 1/n + 5/(n+32) = 1/6 multiply all terms by 6n(n+32) 6(n+32) + 5(6n) = n(n+32) 6n + 192 + 30 n = n^2 + 32 n n^2 - 4n - 192 = 0 (n-16)(n+12) = 0 n = 16 n+32 = 48 ================ ================ check 1/16 + 5/48 = 1/6 ??? 3/48 + 5/48 8/48 1/6 sure enough
February 21, 2017

math
ratio is 1/2 so one of these: 8 4 6 3 4 2 2 1 difference is 2 so 42
February 20, 2017

physics
365.25*24 = h, number of hours distance = 2 pi r = 6.28* 1.5*10^8 km speed = distance/hours
February 20, 2017

suggestion
Maybe point (a,b,c) line like z = m x + n y + k find vector along line find vector from point to random spot on line do cross product, show independent of spot chosen on line. That cross product is perpendicular to the plane containing the two lines
February 20, 2017

geomatry
You are welcome :)
February 20, 2017

Neil
not area, perimeter
February 20, 2017

geomatry
sides a, b c perimeter = a+b+c perimeter 4 a + 4 b + 4 c =4(a+b+c)
February 20, 2017

no way
You say rectangle. I assume typo? Did you read what you wrote? All terms in the area are - ? -17.5 x^2 -138 x - 27 = 231? +17.5 x +138 x + 258 = 0 x = -3.05 or x = -4.84
February 20, 2017

College Algebra
f = 3(6x-5)^2 -4 = 3 (36 x^2 -60 x +25) - 4 = 108 x^2 -180 x +71
February 20, 2017

Physics
How much Ke should she have at 328 m? m g h = 71(9.81)(1370-328) Joules How much Ke does she actually have? (1/2) m v^2 = (1/2)(71)(68)^2 The difference is how much work is done by air friction. ========================== At 328 meters she has a total energy of m g 328 + (1/2...
February 20, 2017

value
log x^n = n log x a 2a 3a 4a .......
February 20, 2017

Physics
1/d^2
February 17, 2017

algebra
e^[2(3x^2-2)]
February 16, 2017

Math
small = s and b = big s = b-2 1/s + 2/b = 5/12 so 1/(b-2) + 2/b = 5/12 agreed multiply by 12 b (b-2) 12 b + 24(b-2) = 5 b(b-2) 12 b + 24 b - 48 = 5 b^2 - 10 b 0 = 5 b^2 - 46 b + 48 0 = (b-8)(5b-6) so use b = 8 s = b-2 = 6
February 16, 2017

Physics
normal force = m g max static = .75 m g so m a = .75 m g for slide to start or a = .75 g now the slide a = .75 g v = a t 33 = .75 g t t = 33/(.75*9.81)
February 16, 2017

physics
m g h = m g (3.4/2)
February 16, 2017

Physics - Calculating work required
This is a problem about POTENTIAL! The path does not matter ! That is the whole point. The voltage potential difference is the difference in potential energy of a unit charge at the two voltages. work done = charge * change in V
February 16, 2017

Physics
force = 55*9.81 Newtons pressure = force/area if area is in meters^2 then force is in Pascals
February 15, 2017

physics
Vi = 110,000 meters / 3600 seconds v = Vi + a t at end, v = 0 so 0 = Vi -49 t t = Vi/49 then d = Vi t + (1/2) a t^2 d = Vi (Vi/49) - (1/2)(49)(VI^2/49^2) d = (1/2)Vi^2/49
February 15, 2017

Algebra
I worked it out in the way you are probably used to. Scroll down
February 15, 2017

Algebra
44+47 = ? mi/h time = 69/speed
February 15, 2017

Math
divide by 1,000 kg/tonne
February 15, 2017

arrgh upside down
.3456/.84 = .4114
February 15, 2017

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