Friday
January 20, 2017

Posts by Damon

Total # Posts: 28,803

physics
1000 * 9.81 * Vol = 25-15 = 10 N so Vol is about .001 m^3 25/.001 = 25,000 N/m^3 or about 2500 kg/m^3 or about 2.5 times that of water
September 19, 2016

Physics
h = 20 t - 4.9 t^2 15 = 20 t -4.9 t^2 4.9 t^2 -20 t + 15 = 0 solve quadratic for two values of t little t on the way up big t on the way down
September 18, 2016

Physics
acceleration F = m A dF/dt = m dA/dt (unless the mass changes:)
September 18, 2016

Maths
2 km + (3/8)j + (1/2)j = 1 j 2km = (8/8 - 4/8 - 3/8)j 2 km = j/8 j = 16 km total you do the rest now :)
September 18, 2016

Math
n + n+1 = 2n + 1 2n is even the next one is odd :)
September 18, 2016

Math
.41 L + .21 (8-L)= 2.08 .41 L + 1.68 - .21 L = 2.08 .20 L = .40 L = 2 p = 8-L = 6
September 18, 2016

Math
x-4 + x-2 + x + x+2 + x+4 = 50 5 x = 50 x = 10
September 18, 2016

Math
n-2 + n + n+2 = 3 n which you can divide by 3 :) It does not matter that they are odd
September 18, 2016

Use parentheses
I do not know what you mean x^3 + 1/(1/x^3) or what you said which is x^3 + 1 + 1/x^3 ???? if the first multiply top and bottom of second term by x^3 x^3 + x^3/1 = 2x^3
September 18, 2016

whoops, go with Reiny
I missed that this is a binomial distribution problem. The combinations are not equally likely.
September 18, 2016

Math
easier grid for me h -> 0 1 2 3 4 t -> 4 3 2 1 0 I see five possible outcomes of which 2 work so I get 2/5 HHTT is the same here as TTHH or HTTH
September 18, 2016

Physical Science
work = force * distance in direction of force 310 = force * 1.5 force = 310 J/1.5 m = 207 Newtons
September 18, 2016

Math
10 a + 5 s = 1700 so s = 340 - 2 a s+a = 270 340 - 2a + a = 270 a = 340-270 a = 70
September 18, 2016

Physics
v = a t = 2.46 t x = -10 + (1.23) t^2
September 18, 2016

Math
15 + .25 t = 20 +.05 t .20 t = 5 t = 25
September 18, 2016

science
4*12+10 = 58 grams/mol 14.17/58 = .244 mol 2C4H10 + 13 O2 ---> 10H2O + 8 CO2 mols CO2 produced = .244(8/2)=.977 mol 2*12+16 = 40 grams/mol 40 g/mol * .977 mol = 39.1 grams
September 18, 2016

Math
t = 4 c t+c = 360 5 c= 360 c = 72 t = 288
September 18, 2016

calculus and chemistry
T = Ts + (To-Ts)e^-(kt) Ts = T surrounding = 10 To = initial T = 160 60 = 10 +(150)e^-(5k) e^-(5k) = .333333 -5k = -1.1 k = .22 so 20 = 10 + 150 e^-.22t e^-.22 t = .0666666 .22t = 2.71 t = 12.3 min 12.3 - 5 = 7.3 min more
September 18, 2016

Maths
r = triangle leg = 20 so is the base 20 so equilateral so 60/360 = 1/6 of circle (1/6)2 pi r =(1/3)pi 20 = 20.94 cm
September 18, 2016

Physics
work done = loss of ke = (1/2)m v^2 = 1000*625 Joules power = work/second = 1000 * 625 / 5 Watts
September 18, 2016

Integrated Math
correct
September 18, 2016

messed up link
http://en.wikipedia.org/wiki/Galileo%27s_Leaning_Tower_of_Pisa_experiment
September 18, 2016

physics
The weight does not matter (Google Galileo, http://en.wikipedia.org/wiki/Galileo%27s_Leaning_Tower_of_Pisa_experiment) about 9.81 m/s^2
September 18, 2016

scince
10 log base ten of power ratio or in this case 10 log 20 about 13 dB If by "intensity" the question means amplitude rather than power then it is 20 log or about 26 dB
September 18, 2016

Physics
http://www.bbc.com/news/business-27021610
September 17, 2016

Physics
a = change in velocity/change in time = (-10 - 10)/5 = -20/5 = -4 m/s^2 v = vi + a t at t = 2 v = 10 -4*2 = 2 m/s at t = 3 v = 10 -4*3 = -2 m/s
September 17, 2016

PRE-CAL
yes, about 55 years 10% doubles in about 7 years :)
September 17, 2016

Physics (Mechanics)
straight up I guess (1/2) m v^2 = m g h h = 22^2/(2*9.81) total height = .8 + h
September 17, 2016

physics
m g h = 5.2 * 9.81 * 3.1 Joules
September 17, 2016

physics
(12)(15)(8.7)^2
September 17, 2016

physics
m g h
September 17, 2016

physics
W = F d 307 = F (1.1)
September 17, 2016

Science
500 *4 = fulcrum force * 1.5 fulcrum force = 500 *4/1.5 force up = fulcrum force force down = 500 + bolt force- so bolt force = fulcrum force - 500
September 17, 2016

linear programming
Oh, forgot the y<8 constraint
September 16, 2016

I did one yesterday
I did one of these for him yesterday.
September 16, 2016

HISTORY
Meanwhile I am wondering if the slaves bought one way or round trip tickets.
September 16, 2016

What are your answers ?
I bet you can get some of these if you really try. Post your answers and if you are wrong I suspect you will hear about it.
September 16, 2016

Social Studies
I disagree.
September 16, 2016

linear programming
well do it. graph the two lines in the first quadrant. y = -(5/9)x + 10 must be above and right points (0,10) and (18,0) y = -(9/8)x + 18 must be below and left points (0,18) and (16,0) intersection at (72*8/41 , -64*5/41 + 10) which is about (14,2) at 0,18 --> 126 at (14,2...
September 16, 2016

Math
8 (50 +4) = 8*50 + 8*4 = 400 + 32 = 432
September 15, 2016

Math, number and operations base
8*1000 + 5*100 + 17*10 + 12 *1 = 8*1000 + 5*100 + 1*100 +7 *10 + 1*10 + 2 = 8*000 + 6*100 +8*10 + 2 = 8682 agree :)
September 15, 2016

Please help with Algebra 2 Ms. Sue
sure, why not slope AB = -2/-6 = 1/3 slope AC = -8/-4 = 2 slope BC = -6/2 = - 3 oh! AB is perpendicular to BC ! slope AB = -1/slope BC
September 15, 2016

maths need help
http://www.wolframalpha.com/input/?i=derivative+x%5E(e%5E3x)%5Ex+
September 15, 2016

need to know takeoff speed
Then use conservation of momentum
September 15, 2016

Linear Algebra
let A be on x axis = a i + 0 j then B put on y axis = 0 i + b j (b could be - of course) ||A + cB|| = || sqrt(a^2 + c^2b^2 || which is >/= sqrt a^2
September 15, 2016

physics
t = time = distance/speed = 15.2/41.3 drop = (1/2)g t^2 = 4.9 t^2
September 14, 2016

Physics
c = 3*10*8 m/s seconds/yr =3600 s/h * 24h/day * 365days/yr
September 14, 2016

algebra
2 x + 4 x + 5 x = 44 11 x = 44 x = 4 2 x = 8 etc
September 14, 2016

TYPO
b/g = 3/4 now 3 boys/7 total is again 3 boys/4 girls the schools have the same number of girls, boys and totals.
September 14, 2016

Math
b/g = 3/4 now 3 boys/7 girls is again 3 boys/4 girls the schools have the same number of girls, boys and totals.
September 14, 2016

math
7/1 5/2 8/10
September 14, 2016

Geometry
You are welcome.
September 12, 2016

Geometry
http://www.jiskha.com/display.cgi?id=1473719167#1473719167.1473720184
September 12, 2016

Geometry
I did it. Check down two
September 12, 2016

science
and snow and ice melt
September 12, 2016

Geometry again
look below
September 12, 2016

geometry
I guess the base is 3x and both sides are 2x or the base is 2x and both sides are 3x so 3x + 4x = 112 or 2x + 6x = 112 x = 112/7 = 16 and 3x = 3*16 or x = 112/8 = 14 and 2x = 2*14
September 12, 2016

History
On second thought, do not check below :)
September 12, 2016

History
Maryland, Virginia, Pennsylvania all very different charter arrangements, especially religions. Look at answers below maybe.
September 12, 2016

Calculus
I guess maybe you mean the average value of the function in that domain. integral = (3/4)x^4-4x^3 at -5 = (3/4)625-4(-125) = 968.75 at 4 = (3)64-4(64) = -64 so I get 968.75 + 64 = 1032.75 divide by length of domain, 9 I agree with you, 114.75
September 12, 2016

physics
total momentum = 0 3*5 = 2*s s = 7.5 m/s in opposite direction
September 12, 2016

physics
That is distance (scalar) not displacement (vector) angle west of north = A tan A = 15/20 = 3/4 = .75 A = 36.9 deg west of north or 360 - 36.9 = 323.1 degrees true
September 12, 2016

maths
area = (1/2) d1 d2 84 = (1/2)(12) d2 d2 = 84/6 = 14
September 12, 2016

Algebra
27*10^11 is correct Are you typing your response on a computer? Perhaps try * instead of the letter x
September 12, 2016

math
y = 3 z z + x = 36 y + x = 72 ------------ z - y = -36 so z = y-36 y = 3 (y-36) 2y = 3*36 y = 3*18 = 54
September 12, 2016

Algebra
1.2*5.9 * 10^19
September 12, 2016

math
http://www.jiskha.com/display.cgi?id=1473658340
September 12, 2016

Algebra
1.57*10^-1
September 12, 2016

Algebra
5.0800 * 10^4
September 12, 2016

Math
d = 30 t d = (1/2)(2.44)t^2 so 30 = 1.22 t t = 30/1.22 solve for t and d then v = 2.44 t
September 12, 2016

Math
V = (4/3)pi r^3 A = 4 pi r^2 4 pi r^2 = 4 pi (16) + 4 pi (64) r^2 = 80 = 16*5 r= 4 * sqrt 5 so (4/3) pi [ 4^3 *5 sqrt 5 ]
September 12, 2016

Math
You just said she ate two apples.
September 11, 2016

first you try
You are evidently studying Europe during the Renaissance. The questions are pretty fundamental to that subject. Many of the potential answers are simply inane (creating military alliances with China?). The right ones are the ones that make sense within the context of the ...
September 11, 2016

algera
t = 3 f 10 t + 50 f = 2080 10 t + 50 (t/3) = 2080 30 t + 50 t = 6240 80 t = 6240 t = 78 tens
September 11, 2016

Sciene Degree
(124/112)28
September 10, 2016

math
on number line |-3| is 3 units right of zero but -3 is 3 units left of zero so the difference is 6 units.
September 9, 2016

Physics
dn = 55*1.3 de = 65*.75 distance = d = sqrt(dn^2+de^2) displacement vector = d at angle of tan^-1(dn/de) north of east average speed = d/(1.3+.75) velocity = displacement vector/(1.3+.75)
September 9, 2016

Science
length of string ?
September 9, 2016

Math
68 - 38 =
September 9, 2016

Math
1/6 = x/1200 x = 1200/6 = 200 yes
September 9, 2016

Geometry
If the side of the cube is longer than 42 it sticks out of the prism. Two of them will fit in there because the prism is twice as long as the cube. (84 = 2 * 42) Obviously if you make that 84 length smaller, only one will fit in.
September 9, 2016

science
LOL, is the question about time on a digital clock or numbers?
September 9, 2016

College mathematics
48 cookies/.5 cups = 96 cookies/1 cup 2.25 cups * (96 cookies/cup) = 216 cookies
September 9, 2016

math
a + b = 14 a - b = 40 ============ add 2 a = 54 a = 27 b = 14 - 27 = - 13
September 9, 2016

Math
Did you try 15 and 20 ??
September 9, 2016

Physics
88.3 = (1/2) g t^2 88.3 = .5 * 23.6 * t^2 t = 2.74 seconds
September 9, 2016

PHYSICS
period = T = 1/f = 1/510 second distance in one period = 340(1/510)meters distance in 250 periods =250*340/510
September 9, 2016

TYPO
v at 19.5 = v at 8.5 + 10*11 = 105 + 110 = 215 meters/second at 19.5 that is average speed from t = 19 to t = 20 so 215 meters
September 9, 2016

Science
at 4.5 seconds it is going 65 m/s at 8.5 seconds it is going 105 m/s a = change in v / change in time a = 40/4 = 10 m/s^2 so 19.5 - 8.5 = 11 seconds v at 19.5 = v at 8.5 + 10*11 = 8.5 + 110 = 118.5 meters/second at 19.5 that is average speed from t = 19 to t = 20 so 118.5 meters
September 9, 2016

copy and paste does not work here
We can not see your list.
September 8, 2016

math
89 degrees 59 minutes 60 seocnds - 78 degrees 00 minutes 43 seconds =
September 8, 2016

Physics
I do not know the mass of the bullet but energy = (1/2) m v^2
September 8, 2016

Physics
mv rocket = m v exhaust so d/dt (mv rocket) = d/dt (mv exhaust) m v rocket = (50 - 2 t)v = m v exhaust = (2t)1000 50 v - 2vt = 2000 t 50 dv/dt -2v - 2t dv/dt = 2000 at t = 0 and v = 0 50 dv/dt = 50 a = 2000 a = 40 m/s^2
September 8, 2016

Math
-1 = 12 x - 42 + 22 19 = 12 x x = 19/12
September 7, 2016

Physics
Ke = (1/2) m v^2 work done = F d where F = .68 m g so .68 g d = (1/2) v^2
September 7, 2016

maths
x^2 + x^2 = 50 x^2 = 25 x = 5
September 7, 2016

Math
(7+10+14 + x) = 4*15 31 + x = 60 x = 29
September 7, 2016

math
23/4 = 5 with remainder 3
September 6, 2016

Physics
3 sin A = 1.7 where A is the angle upstream from straight across
September 6, 2016

Math Help
6/10 + 7/10 = 13/10 needed each bag is 8/10 so two bags is enough, 16/10 from the secondbag 3/10 is left over plus the entire third bag so remainder = 11/10 or 1 1/10
September 6, 2016

  1. Pages:
  2. <<Prev
  3. 10
  4. 11
  5. 12
  6. 13
  7. 14
  8. 15
  9. 16
  10. 17
  11. 18
  12. 19
  13. 20
  14. 21
  15. 22
  16. 23
  17. 24
  18. Next>>