Thursday
January 19, 2017

Posts by Damon

Total # Posts: 28,803

PHYSICS- PROJECTILE MOTION
Your teacher is really trying to get to you with this separation of constant horizontal speed from increasing vertical speed. 89 * 3.10 centimeters if you really mean cm/s
October 20, 2016

Pre algbra
-20/30 - 9/30
October 20, 2016

PHYSICS- PROJECTILE MOTION
a) Trick question - it does not change. u = 1.90 b) v = -9.81 t so |v| = 9.81 (0.410) c) speed = sqrt (u^2+v^2) d) tan (angle down from horizontal) = |v|/u
October 20, 2016

physics
sqrt(9+4)
October 19, 2016

Calculus
line is y = -5 x + 3 so slope = -5 = slope of tangent f' = slope = 6 x - 7 where is that -5? 6 x - 7 = -5 6 x = 2 x = 1/3 so y = 3(1/9) -7(1/3) + 4
October 19, 2016

History
World War One?
October 18, 2016

Physics
Violet bends more than red the slower wavelength bends more so violet is slower
October 18, 2016

nobody knows
the other two sides must also have lengths.
October 18, 2016

Physics
f = sqrt (T/[m/L]) / 2L m = 8000 A L so 170 = sqrt (T/8000A)/4 680 = sqrt (T/8000A) also 1% = .01 = T/ (E A) so T/A = .01 E so 680 = sqrt (.01 E/8000) 462400 = .01 E/8000 E = 3.7 *10^11
October 18, 2016

physics
20 = (1/2)10 t^2 solve for t = 2 seconds d = 15 t =15*2 = 30 m
October 18, 2016

physics
The total momentum of the system can not change if there is no external force. Therefore 4
October 18, 2016

Math Question
parabola, not a line, because y is squared
October 17, 2016

Math
12 a + 8.5 s = 10,175 a+s = 950 so s = (950-a) 12 a + 8.5(950-a) = 10,175 12 a + 8075 - 8.5 a = 10,175 3.5 a = 2100 a = 600
October 17, 2016

Math
4x*1 = 4x
October 17, 2016

math
4x = 50 x = 12.5
October 17, 2016

Algebra
10x+4
October 17, 2016

History
How about basic language (Indo European) ?
October 17, 2016

Engineering
ABS density varies from 1.0 to 1.4 grams/cc you did not give any units except dollars .437 what? grams, pounds, kg , oz ?
October 17, 2016

Nobody knows
we do not know how much plastic each part takes
October 17, 2016

Math
21/4 + 41/16 is 84/16 + 41/16 your turn now
October 17, 2016

math
her speed = v current speed = 3 time up = 18/(v-3) time down = 18/(v+3) so 18[ 1/(v-3) + 1/(v+3) ] = 8 [ 1/(v-3) + 1/(v+3) ] = 4/9 [ v + 3 + v - 3 ] = (4/9)(v^2-9) 18 v = 4 v^2 - 36 2 v^2 - 9 v - 18 = 0 v = 6 for positive v root ----------------------------- check up speed = 3...
October 17, 2016

Physics
more like 12.7 did you take the square root? I think not :)
October 17, 2016

Physics
(1/2) v^2 = 9.81 (8.2) v^2 = 16.4*9.81
October 17, 2016

math
pi r^2 h = 25 so h = 25/(pi r^2) A = 2 pi r^2 + 2 pi r h but we know h(r) A = 2 pi r^2 + 2 pi r * 25/(pi r^2) A = 2 pi r^2 + 50/r r better be >0
October 17, 2016

math
he has made .4*20 = 8 of 20 he shoots total of 20 + x shots 8 + x = .5(20+x) 8 + x = 10 + .5 x .5 x = 2 x = 4 ==================== check he has now shot 24 and has made 8+4 = 12 sure enough 12/24 = .5
October 17, 2016

math
fewer dollars per oz or per pound is cheaper per pound of weight gained.
October 17, 2016

Math
1.5+1.2 = 2.7
October 17, 2016

Maths
How many do you think? Draw a picture.
October 17, 2016

maths
there are 2 pi radians in a circle C = 2 pi R so (2.5/2pi)(2 pi R) = 2.5 R = 2.5 * 8 = 20
October 17, 2016

algrebra
-6x = 2 x = -2/6 = -1/3
October 17, 2016

Math
1 1/2 = 3/2 (3/2)(42) = 3 (21) = 63
October 17, 2016

I don't either
I could say 7 + 31 + 6 = 44 low or 8 + 32 + 7 = 47 high but that would be kind of silly and I would be more likely to estimate using nearest whole numbers 8 + 31 + 7 = 46
October 17, 2016

math
L + w = 250 so L = 250-w L = 50 + w so 250 - w = 50 + w 2 w = 200 w = 100 L = 150
October 17, 2016

Math
LOL, ok dividing by 3 is the same as multiplying by 1/3 :)
October 17, 2016

Math
huh?
October 17, 2016

Math
(9/5)/3 = 3/5
October 17, 2016

Math
(-11/8)(14/5) = - (11/4)(7/5) = 77/20 = 3 17/20
October 17, 2016

Math
1.5 + 1.2
October 17, 2016

8th pre algebra
By the way that is algebra, not pre algebra :)
October 17, 2016

8th pre algebra
2(10) - 7 = ? sure enough 13 so you are right BUT actually you ADDED 7 to both sides
October 17, 2016

Trig
2sin 2Tcos2T/[1 + 2 cos^2 2T -1] = sin 2T cos 2T/ [cos 2T cos 2T] = sin 2T/cos 2T = tan 2T = 2 tan T/[1-tan^2T]
October 17, 2016

math
6.60/[12*710] or 9.18/[24*500] which is less dollars per mL ?
October 17, 2016

Physics (Mechanics)
m2 going up is + -m1 g + m2 g sin T= (m1+m2)a -2.5(9.8)+9.8m2 sin T=-(2.5+m2).108 -.8(9.8)+9.8m2sinT = (.8+m2)2.888 ---------------------------------- subtract to get rid of 9.8m2 sin T solve result for m2 go back and get m2 sinT and therefore sin T
October 17, 2016

math (Help)
if it has the square root of a variable in it (y^.5), it is not a straight line
October 17, 2016

sure do need steve
I can make no sense at all of your problem statement.
October 17, 2016

Math Functions
6000 + 1000 x
October 17, 2016

Math Limits
looks good to me
October 17, 2016

Math
It has y^2 in it. It is therefore a parabola, not a straight line e.
October 17, 2016

physics
v = Vi - 9.81 t at 1.7 s 19 = Vi - 9.81 (1.7) solve for Vi, launch speed at 5.4 s v = Vi - 9.81(5.4)
October 17, 2016

algebra
.55 V1 + .80 V2 = .6(50) and V1 + V2 = 50 so V2 = 50 - V1 .55 V1 + .8(50 -V1) = 30 etc
October 17, 2016

History
This is pretty important. What do you think?
October 17, 2016

physics
v = Vi - 9.81 t h = Hi + Vi t -4.9 t^2 ==================== 2.2 = 1.5 + 6.4 t - 4.9 t^2 solve quadratic for t then v = 6.4 - 9.81 t
October 17, 2016

Physics
72 km/hr = 72000/3600 = 20 m/s
October 17, 2016

Math
(6.4/2)100 = 320 %
October 17, 2016

math
you mean 2 - 3^2 ??? 2 - 9 = -7
October 17, 2016

6th grade math
another way to think about it: (3/4) pic / 1 sec = 6 pic/ x sec (3/4) x = 6 x = (4/3)6 x = 8 seconds
October 17, 2016

6th grade math
6 pictures[1 second/(3/4) picture] = 6 *4/3 = 8 seconds
October 17, 2016

Geometry
change in x = -15 change in y = -1 distance = sqrt(225+1) = sqrt(226)
October 17, 2016

typo
I mean .131/16 = .008 mols O
October 17, 2016

Science (Chemistry) Ratio of mole
If you had used mols O you would have had .13/.16 = .008 or two mols of O for every one of Mg so it would have been MgO2 anyway :)
October 17, 2016

math
L + w = 42 L + 3 = 4 w 42 - w + 3 = 4 w 5 w = 45 etc
October 16, 2016

Physics
normal force = m g cos 30 so friction force </= mu m g cos 30 can only say less than if object is not moving. component of weight down slope = m g sin 30 so if no other forces are acting m g sin 30 </= mu m g cos 30 or mu >/= tan 30
October 16, 2016

Math
maybe 1002001 ? That is a lot of km 2000 km / (35 + 48 + 45.5) = 15.56 km/L = 6.43 L/100 km
October 16, 2016

physics
http://www.physicsclassroom.com/class/sound/Lesson-5/Closed-End-Air-Columns
October 16, 2016

Physics Force and Friction question
max static friction force = .4*981 which is more than 350 so It stays in place. 350 N might be enough to keep it moving, but is not enough to start it.
October 16, 2016

need more info
Is it barely not moving, is it moving at constant velocity, is it accelerating?
October 16, 2016

Math( 7th grade advanced math so 8th grade math)
A = 3 x + 59 + 2*35 = 3x + 129
October 16, 2016

physics
oh my, still in feet? in this case g = about 32 ft/s^2 v = 58 - 32 t at top t = 0 t at top = 58/32 seconds total time in air by the way = 2 t = 58/16 seconds now the problem: h = Vi t - .5 * 32 t^2 H = 58 (58/32) - .5 * 58^2/32 (A.) H = 58^2/64 ft (B.) 2 t = 58/16 sec when h...
October 16, 2016

Math( 7th grade advanced math so 8th grade math)
ah 4 8 16 32 64
October 16, 2016

Math( 7th grade advanced math so 8th grade math)
4*2^n n = 4 quarters of and hour 2^4 = 16 so 4*16 = 64
October 16, 2016

Science/Math
If it did not float then 5 mL
October 16, 2016

Math
well, I am inclined to multiply first equation by 4 and second by 3 -56 x + 60 y = 12 +63 x - 60 y + 30 ------------------- add 7 x = 42 so x = 42/7 then -14(42/7) + 15 y = 3 -84 + 15 y = 3 15 y = 87 y = 87/15 ========================= try that in the second one to check 21(42...
October 16, 2016

Social Studies
Just for fun: http://www.nationalgeographic.com/travel/top-10/ancient-highways/ http://www.bbc.com/news/magazine-33291373
October 16, 2016

Social Studies
Did historical Japan have good roads? Did the Incas? How were each governed? How did they communicate with other nations?
October 16, 2016

Math
g = number of girls 5g/7 = number of boys g - 5g/7 = 120 2g/7 = 120 g/7 = 60 g = 420 then boys = (5/7)420 = 300 and 420 + 300 = 720 total
October 16, 2016

chemistry
Do you mean in catalytic converter? Maybe read "types" section in here: http://en.wikipedia.org/wiki/Catalytic_converter
October 16, 2016

Math
using common denominator of 18: 10/18 , 7/18 and 9/18 Now you rearrange them.
October 16, 2016

physics
2.9*9.81 Newtons
October 15, 2016

chemistry
A certain wavelength or frequency corresponds to a certain photon energy which is a certain change of energy of the electron shell around the atom. In other words the frequency tells you how an electron orbit changed.
October 15, 2016

calculus
dh/dt = -9.8 t + 10 when t = 1 dh/dt = 10-9.8 = 0.2
October 15, 2016

math
x y change in y/change in x which is slope -2 9 ****** -5 -1 4 ****** -5 0 -1 ****** -5 1 -6 ****** -5 2 -11 hmmm, constant slope = -5 y = -5 x + b 9 = -5 (-2) + b 9 = 10 + b b = -1 so y = -5 x -1 answer check at last point -11 = -5(2) -1 -11 = -10 - 1 yes, good
October 15, 2016

Cousino
speed upstream = 8 - u speed downstream = 8 + u time upstream = 5/(8-u) time downstream =5/(8+u) so 5(8-u) + 5/(8+u) = (4/3) hr 5(8+u) + 5(8-u) = (4/3)(64-u^2) 15(8+u) + 15(8-u) = 256(64-u^2) etc, solve quadratic
October 15, 2016

be careful with parentherses
do you mean 1/(2a) or (1/2)a 1) f(-2) = 4 a^2 +2a + 3b = 4 a^2-b+8 f(-3) = 9 a^2 +3a + 3b = 7a^2-b+14 so 2 a + 3 b = - b + 8 2 a + 4 b = 8 a + 2 b = 4 or a = 4 - 2 b and then 2 a^2 + 3 a + 4 b = 14 2(16 - 16 b +4b^2) + 3(4-2b) +4b=14 32 -32b +8b^2+12 -6b +4b = 14 30 + 8b^2 -...
October 15, 2016

physics
v = velocity up = 30 sin 30 - 9.81 t u = velocity horizontal = 30 cos t if t = 1 v = 15 - 9.81 u = 30(.866) speed = sqrt (u^2+v^2) tan angle up = v/u
October 15, 2016

math
as y--->0 cos y = 1 - y^2/2 + ........ numerator: 2 - 1 +(1/2)(9)x^2 -1 +(1/2)(16)x^2 0 + (25/2)x^2 oh my now divide by x 25 x/2 goes to 0 as x goes to 0
October 15, 2016

math
by the way tangent of small angle approaches sine of that small angle :) theta + theta^2/2 .......
October 15, 2016

math
Hey, I did the other one, try series approach on this one too.
October 15, 2016

math
m = math only s = science only b = both = 10 31 = m + b = m + 10 so m = 21 s+b = 36 - m s + 10 = 36 - 21 s + 10 = 15 so = Answer all science students s = 5 only science ======================== check 21 + 10 = 31, yes all math students 5 + 10 = 15 , yes all science students 21...
October 15, 2016

Pre-calculus
This is what it is about: http://www.youtube.com/watch?v=zw0waJCEc-w sin 45 = (1/2)sqrt 2
October 15, 2016

Pre-calculus
well, 7 = 6 + 1 so it is really sin (6 pi/12 + pi/12) sin(a+b) = sin a cos b + cos a sin b (just like your other problem) sin 6 pi/12 = sin 90 = 1 cos pi/12 = cos 15 deg cos 90 = 0 so cos 15 degrees
October 15, 2016

Math
y = k/x^3 new y = k/(x/2)^3 = 8 k/x^3 8 times as big
October 15, 2016

english
I have made 100 ship models in my life. I had made 100 ship models when they told me to stop and start doing physics problems.
October 13, 2016

Maths
9 km/(3/2)hr = 18/3 = 6 km/hr
October 13, 2016

Math- Please check my answer!
6/8 = 60/80 8/10 = 64/80
October 13, 2016

Math
2 driveways/day * 5 d/w = 10 driveways/week 10 driveways/week * 50 work weeks/yr = 500 driveways/year Now as Myah said, what is the question?
October 13, 2016

physics
heat of fusion * 150 g + 150 * heat capacity* (T-0) = 300 * heat capacity*(50-T)
October 13, 2016

Physics
normal forces 5 kg block: 5(9.81) 10 kg block 5*9.81 and 15*9.81 forces 5 kg block .2 * 5 * 9.81 right T left no acceleration so T = .2 * 5 * 9.81 = 9.81 N (answer to part C by the way) 10 kg block T left .1 * 15 * 9.81 left 45 N right so 45 - 9.81 - .1*15*9.81 = 10 a the end
October 13, 2016

physics
h = 1 = (1/2)(9.81)t^2 (a)solve that for t, the fall time u t = 1.5 (b)so u = 1.5/t v = g t = 9.81 t speed = sqrt (u^2+v^2) tan angle below hor = |v|/u
October 13, 2016

8th Grade Math
y = k x -12.5 = 50 k -25 = 100 k k = -1/4 y = -x/4 y = - (47/4) / 4 = - 47/16
October 12, 2016

math
(5)(3/13) - 2(10/13) = -5/13 You better stay away from this game. There are 13 cards in each suit of which 3, the jack, queen and king are winners. The other 10, ace through 10, are losers
October 12, 2016

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