Friday
September 30, 2016

Posts by Damon

Total # Posts: 27,213

Physics
Vi = 30 sin 40 u = 30 cos 40 h = 0 + Vi t - 4.9 t^2 0 = 30 sin 40 t - 4.9 t^2 0 = t (30 sin 40 - 4.9 t) so t = 30 sin 40/4.9 for downrange time range = r = u t r = 30 cos 40 * 30 sin 40 /4.9 = 30^2 sin 80/9.8 so the first one :)
September 29, 2016

History
well B is just as unlikely as C :)
September 29, 2016

typo
5/9 * 4/8 = 20/72 = 5/18
September 29, 2016

maths
susan takes lemon then ann takes lemon: 5/9 * 4/8 = 20/72 = 5/13 susan takes orange then ann takes orange: 4/9 * 3/8 = 1/6 add them
September 29, 2016

Math
3 2/3 = 9/3 + 2/3 = 11/3 17/4 = 16/4 + 1/4 = 4 1/4
September 29, 2016

math
.02 * 30 = original amount of dry cucumber which does not change .11 x = .02 * 30
September 29, 2016

Math hellppp!!
You are welcome.
September 29, 2016

Math hellppp!!
I get your parentheses right (-12/3)*(-8+(-4)^2-6)+2 -4^2 = 16 -8+16-6 = 2 -12/3 = -4 -4* 2 = -8 -8 + 2 = -6
September 29, 2016

Math
so what is 5^3 ?
September 29, 2016

Math
96/2 = 48 48/2 = 24 24/2 = 12 12/2 = 6 6/2 = 3 so 3*2^5 what is 5*5*5 ?
September 29, 2016

Math
let y = f(t)/2.7 to make it easy y = 1.004^t ln y = t ln 1.004 = 0.00399 t e^ln y = y = e^.00399 t so f(t) = 2.7 y = 2.7 e^.00399 t
September 29, 2016

Social Studies Religion
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; ........ If it does not ring a bell, use Google :)
September 29, 2016

History PLEASE CHECK MY WOrK
I agree with you.
September 29, 2016

History
Portuguese owned Brazil. Brazil had manioc. Portuguese took it to Africa. A
September 29, 2016

History
still A Google manioc Portuguese Brazil
September 29, 2016

CHECK MY ANSWERS American Government
1. agree but this ignores alternate path through constitutional conventions. 2. I guess you are right but am tempted by the first choice. I agree with the others.
September 29, 2016

Grammar
....and then there is that subjunctive "would" .... :)
September 29, 2016

History
http://agron-www.agron.iastate.edu/Courses/agron212/Readings/Corn_history.htm by the way American tribes were so thinly spread out that even if every single person one died it would have been just a blip in global population
September 29, 2016

History
Yes A, like corn You are welcome.
September 29, 2016

History
Oh come on! Native Americans did not have gunpowder. The European invaders did. Both had bows and arrows and hatchets. The Spanish horses were their best weapon though. Of course blowguns were kind of unusual in 17 th century Europe but I am not sure that is what we are ...
September 29, 2016

History
B is nonsense. Native Americans did not work out as slaves even here in America. They revolted or died. That is why the European creeps started importing slaves from Africa.
September 29, 2016

Maths
twice 3.50 is 7.00
September 29, 2016

algebra
You are welcome.
September 29, 2016

algebra
well, I write that line under as >/= or </= It does not change your approach and is just like an equal sign. If it is there, leave it there in your answer. </= is leas than or equal >/= is greater than or equal
September 29, 2016

algebra
multiply both sides by 1/2 n > 7 multiply both sides by 5 n > 55 NOW if you multiply both sides by a NEGATIVE number, you turn the arrow around and shoot the other way. multiply by -1/3 and reverse direction y > 6
September 29, 2016

math
e^ix= cos x + i sin x so what we have here is 2 cos pi/4 + 2 i sin pi/4 conjugate is 2 cos pi/4 - 2 i sin pi/4 but cos pi/4 = .5 sqrt 2 and sin pi/4 = .5 sqrt 2 so sqrt 2 - i sqrt 2
September 29, 2016

Typo in units?
I do not believe your lengths. are they all in meters?
September 29, 2016

Social Studies
I agree with you. It hit small farmers in what was then the west hard paying by the gallon but big distillers in the east could pay a flat fee.
September 29, 2016

Physics
time = t distance in meters = 1,000*distance in km distance covered by cheetah = d distance covered by gazelle = d-70 d = 100,000 t d-70 = 80,000 t so 70 + 80,000 t = 100,000 t 20,000 t = 70 t = 7/2000 hours in seconds (3600 s/h) t in seconds = 7*3600/2000 = 12.6 seconds
September 29, 2016

Algebra error repair
What is the product of (–6.8)2? a. –13.6 b. 46.24*** c. –46.24 d. 13.6 ============================= Notation???? what you wrote was (-6.8)(2) which is -13.6 , a. (not d) if you meant to type (-6.8)^2 that is (-6.8)(-6.8) = 46.24
September 28, 2016

Algebra
4. YES!!!! 5. Yes !!! 6. yes !!! 7. yes 8. result is POSITIVE so d is wrong a and b are right
September 28, 2016

Algebra
3. 10/7 * 10/7 = 100/47 so 10/7
September 28, 2016

Algebra
2. + 14 look, -14 * -14 works but so does +14 * +14 by convention though the positive square root is used
September 28, 2016

Algebra
What is the product of (–6.8)2? a. –13.6 b. 46.24*** c. –46.24 d. 13.6 ============================= Notation???? what you wrote was (-6.8)(2) which is 13.6 , d. if you meant to type (-6.8)^2 that is (-6.8)(-6.8) = 46.24
September 28, 2016

physics
v = Vi + a t 23.4 = Vi + 8 t average speed = (Vi+23.4)/2 so t = 9.7/[ (Vi+23.4)/2 ] so 23.4 = Vi + 8*9.7/[ (Vi+23.4)/2 ] solve for Vi
September 28, 2016

physics
h = Hi + Vi t - 4.9 t^2 0 = Hi + 6.22(2.7) - 4.9 (2.7)^2
September 28, 2016

science
you mean 20 m/s^2 I think F = m a = .15 * 20 = 3 N
September 28, 2016

maths /science
v = -9.81 t = -25 so question 2 t = 25/9.81 question 1 d = -4.9 t^2
September 28, 2016

maths/science
just like the other one v = - g t -63.7 = -9.81 t
September 28, 2016

maths
let g = 9.81 m/s^2 then v = -gt = -9.81*7 m/s or if using clunky units g = 32 ft/s^2 v = -32*7 ft/s
September 28, 2016

Math
I do not know what "break apart" means. But if I did not already know the answer I would think 54 = 60 - 6 = 10*6 - 1*6 = (10-1)6 distributive property = 9 * 6 so 9
September 28, 2016

Math
-1 +6 -1 +6 -1 +6 so 20-1 = 19 19+6 = 25 25-1 = 24 24+6 = 30 etc
September 28, 2016

Math
(1/4)(2/3) = 2/12 = 1/6
September 28, 2016

Physics
(a) w = normal force on floor = (9.81+2.70)8.06 (b) w = (9.81-2.70)8.06 friction force = .402 w in each case
September 28, 2016

Science
I have a sneaking suspicion that you are correct :)
September 28, 2016

AP Calculus
when slope is +, velocity is to right when slope is -, velocity is to left when curvature is + acceleration is + (holds water) when curvature is -, acceleration is - (sheds water)
September 28, 2016

copy and paste does not work here
I do not see your choices.
September 28, 2016

Math
draw it but 15 play all three 20 play b ball and hockey of which 15 are in all three so 5 play only b ball and hockey
September 28, 2016

Math
y = k x 6 = k (-2) k = -3 15 = -3 x x = -15/3 x = -5
September 28, 2016

Math Help!!!
3 1/2 → 1 1/4 no 7/2*1/2 = 7/4 = 1 3/4 5 3/4 → 2 1/8 no 23/4 * 1/2 = 23/8 = 2 7/8 3 1/6 → 1 7/12 yes 19/6 *1/2 = 19/12 = 1 7/12 4 1/2 → 2 1/4 yes 9/2*1/2 = 9/4 = 2 1/4
September 28, 2016

algebra 2
I can not see your choices but x^2 is always </=0 so y>/= 7
September 28, 2016

Physics
at h/4 total mechanical energy = m g(h/4)+(1/2)m (18)^2 at h total mechanical energy = m g h + 0 so gh = gh/4 + 9*18 for part b (1/2)m v^2 = m g h
September 28, 2016

Physics
north 7 and east 5 hypotenuse sqrt(49+25)
September 27, 2016

Mechanics
sin 30 =Fy/50 cos 30 = Fx/50
September 27, 2016

English
2. Choose the meaning of the bold word. Failing that, I could have SURREPTITIOUSLY dumped the whole outfit overboard, written off the forty or so dollars as love’s tribute. (“The Bass, the River, and Sheila Mant") happily*** slyly ##################### ...
September 27, 2016

math
first person does 1/60 job/min second does 1/90 job/min together they do 1/60 + 1/90 = 3/180 + 2/180 = 5/180 job/min so (5/180)t = 1 job t = 180/5 = 36 minutes
September 27, 2016

Physics
ride speed = 20 m/50 s = .4 m/s total speed = .4 + .5 = .9 t = d/speed = 20/.9 = 200/9 = 22.2 seconds part b speed = .5 - .4 = .1 20/.1 = 200 seconds
September 27, 2016

Physics
u = 50 cos A Vi = 50 sin A 240 = u t = 50 t cos A so t, time in air, = 24/(5cosA) time rising = t/2 = 12/(5 cos A) v = Vi - g t rising 0 = 50 sin A - 9.81(12)/(5 cos A) 250 sin A cos A = 9.81(12) now use trig to get angle A for second part you have two values of Vi = 50 sin T ...
September 27, 2016

Math
weeks = days/7
September 26, 2016

Math
5*15 does not work either :)
September 26, 2016

Math
32-17 = 15 w = 17*5 + 15*6 by the way I bet they mean centimeters not millimeters.
September 26, 2016

physics
46 N
September 25, 2016

maths
5(x+iy)(x-iy)+3(x+iy -x +iy) =42-15i 5x^2+5y^2 + 6iy = 42-15i 5 x^2 + 5 y^2 = 42 6 i y = -15i y = -15/6 5 x^2 + 5 (225/36) = 42
September 25, 2016

Physics
kinetic energy at planet surface = potential energy at max height (1/2) m v^2 = m g h h = v^2/2g so if g is g earth/6 then the height is h earth * 6
September 24, 2016

Science
http://www.jiskha.com/display.cgi?id=1474739216
September 24, 2016

Math
combinations of 9 taken 3 at a time = 9!/[ (9-3)!(3!)] = 9*8*7/(3*2) = 3*4*7 = 12*7 = 84
September 23, 2016

Physics
g force down slope = mg sin phi friction force up slope = mu mg cos phi a = F/m = g sin phi - mu g cos phi = g (sin phi - mu cos phi)
September 23, 2016

Physics
To raise something to a power please use ^ symbol To divide please use / symbol work done = kinetic energy gained = (1/2)mv^2 power = work done/time = (1/2) m v^2 t = m v^2 /(2t)
September 23, 2016

Physics
average speed = .568/2 = .284 m/s time = t = .389/.284 = 1.37 seconds a = change in speed / change in time = .568/1.37 = .415 m/s^2 F = m a = 79.5*.415 = 33 Newtons
September 23, 2016

Physics
Well, yes but it was the change in POTENTIAL energy m g h. The velocity is assumed negligible.
September 23, 2016

Physics
400*9.81 = 3924 Newton weight I guess the mechanic is also on the ground?mechanical advantage needed = 3924/250 = 15.7 since pulleys do not come in fractions we will need 16 times 16*3 = 48 meters
September 23, 2016

Physics
+i +j +k -5 -3 -4 +0 +1 +0 = 5 k + 4 i or 4i +0j +5k (note obviously perpendicular to j so no j component)
September 23, 2016

Social studies
I would claim horses. Try: http://latinamericanhistory.about.com/od/theconquest/a/09armsconquest.htm
September 23, 2016

Social Studies
no, please read what I said.
September 23, 2016

Social Studies
Native to Brazil. Portuguese brought it to West Africa.
September 23, 2016

Engineering Math
x = Xi e^-kt .41 = e^-120k ln.41 = -120 k k = .00743 .5 = e^-.00743 t ln.5 = -.00743 t t= 93.3 daya so I pretty much agree with you .77 = e^-.00743 t t = 35.2 days
September 23, 2016

Math
You are welcome.
September 23, 2016

Math
|-13| = +13 which is not -13
September 23, 2016

Social studies NEED HELP
What does your book say? Does it discuss the Portuguese going east around Africa to the Indian Ocean and East Indies? Does it mention that other European countries might want to find another way to get there and that Columbus thought he could get to the East Indies by sailing ...
September 23, 2016

algebra
a + (n-1)d .5 + (n-1).5
September 23, 2016

algebra
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
September 23, 2016

algebra
.5 , 1 , 1.5 , 2.0 , 2.5 is .5 , 1.5 3.0 , 5.0, 7.5 on day 5 of course this is an arithmetic sequence with d = .5
September 23, 2016

physics
assume you mean 10^7 and 10^-16 etc How long to move 35*10^-3 m ? t = 35*10^-3/1.9*10^7 so t = 18.4 * 10^-10 seconds a = F/m = 6*10^-16 / 9.11*10^-31 = .659 * 10^15 m/s^2 d = (1/2) a t^2 = (1/2)(.659*10^15)(339*10^-20) = 112*10^-5 = .00112 meters or 1.12 mm
September 23, 2016

Math
n-1 , n , n+1 4(n-1)-13 = n+1 4 n - 4 - 13 = n+1 3 n = 18 n = 6 5, 6, 7
September 23, 2016

Social Studys
How about "no taxation without representation" ?
September 21, 2016

jay
P/2 = L+w w = P/2 - L
September 21, 2016

jay
A = h (a+b)/2 2 A/h = a + b a = 2A/h - b
September 21, 2016

equation is wrong !
h(a+b)/2 not times 2 average base times height, common sense
September 21, 2016

Math
use 4y-6 for x y = 4 - 3 (4y-6) y = 4 - 12 y + 18 13 y = 22 y = 22/13 x = 4(22/13) - 6 x = 88/13 - 78/13 x = 10/13
September 21, 2016

Math
I think you mean 12 grams and 40% 12 = .4 x so x = 12/.4
September 21, 2016

Science
How about mountain ranges for example ?
September 21, 2016

Algebra
I knew the slope m so I used y = m x + b I put in 2 for x and -3 for y that is the point (2,-3) -3 = (1/3)(2) + b
September 21, 2016

Algebra
slope = m = (-4+3)/(-1-2) = -1/-3 = 1/3 -3 = (1/3)(2) + b b = -9/3 - 2/3 = -11/3 y = (1/3) x -11/3 3 y = x - 11 x -3 y = 11
September 21, 2016

PHYSICS
yf = yo + vo t + (1/2) a t^2 yf = 0 yo = unknown vo = 0 (dropped not thrown) vf irrelevant ( = a t) a = -4.9 indeed t = 3.5 so 0 = yo + 0 -4.9 (3.5)^2 or yo = 4.9 (3.5)^2
September 21, 2016

statistics
http://davidmlane.com/hyperstat/z_table.html
September 21, 2016

Science
Huh? v = a t so a = 15/10 = 1.5 m/s^2 not 2.5 m/s^2 Something is wrong with the problem statement.
September 20, 2016

Math
(4 km/cm)(4 cm) = 16 km
September 20, 2016

science
water is neutral lime juice and HCl are acidic NaOH is basic
September 20, 2016

Chemistry
What do you think? Imagine doing this and measuring how much is in the beaker by the lines on the side.
September 20, 2016

physic
so the increase in speed of the dropped one cancels the slow down of the other and height = initial speed up * time = 20*3 = 60
September 20, 2016

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