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Posts by Scott

Total # Posts: 2,308

chemistry
100% * (1/2)^(120 / 4.55)

ALGEBRA
the "graphing form" is the vertex form f(x) = a (x - h)^2 + k ... a = 1 in this case vertex is (h,k)

Physics
momentum is conserved 65 kg * 2 m/s = 55 kg * v the canoe moves in the opposite direction

Physics
the index of the solution must be approximately the index of the material there is no refractive boundary between the material and the solution, so the material seems invisible

Pre calc
the height of the observer is ... h = 375 sin(25º) the height of the tower above the observer is ... h = 375 sin(39º) add the two heights to find the tower (remember to round)

pre calc
exact answer is given in "related questions" at bottom of page

Algebra
they each paint a fraction of the house ... the fractions add to one t / 10 + t / 15 = 1 3t / 30 + 2t / 30 = 1 5 t = 30

precalc
a) u - v b) u - 2 v c) 2 u + 4 v

Maths
c = 4 h 2 (c - 280) = h c = 8 (c - 280) solve for c, then substitute back to find h

Preclc
use the Law of Sines to find the distance from one of the people to the spot then use trig to find the height of the spot the angle at the spot is ... 180º - 75º - 45º = 60º 600 m / sin(60º) = x / sin(45º) ... x is the distance from the observer ...

Physics
"acquires" is an interesting term the muscle energy on the ground (like a spring), becomes gravitational potential energy during the jump it appears you have correctly calculated the height

Physics
looks actually correct to me

pre calc
because i made a typo...

pre calc
use the Law of Sines the angle at the ship is ... 180º - 46º - 63º 283 ft / sin(43º) = 350 ft / sin(63º) ... = x / sin(180º - 46º - 63º)

algebra
to save money with B ... A > B .2 m + 40 > .12 m + 56.32 .2 m > .12 m + 16.32 .08 m > 16.32 m > 204

Precalculus
the plane flew 360 mi east in the air but the air moved east and north ... this is the wind speed 15 mi E and 20 mi N forms a 3-4-5 triangle the wind is ... 25 mi / 2 hr ... on a bearing N of E the tangent of the bearing angle is ... 20 / 15

math
twice the teeth means half the revolutions teeth * speed = k = 48 * 3 = 144 96 * s = 144 ... s = 144 / 98

physics
nope E friction from the tires and normal force from the banking

Math
looks like a glass/class typo 2/3 of 30.9 kg 2 * 30.9/3 = ?

Pre calc DUE TOMRROW
i mis-transposed the 43º ... it should be 46º

Pre calc DUE TOMRROW
use the Law of Sines the angle at the ship is ... 180º - 46º - 63º 283 ft / sin(43º) = 350 ft / sin(63º) ... = x / sin(180º - 46º - 63º)

geometry
use ... a^2 + b^2 = c^2 ... twice

Pre-cac
the max is on the axis of symmetry x = 3 / 2a 15 = a (3 / 2a)^2 - 3 (3 / 2a) + 5 10 = (9 / 4a) - (9 / 2a) 10 a = 9/4 - 9/2 = - 9/4 a = -9/40

physics
google "uniform circular motion" look at the diagrams on wikipedia

Math
time = distance / velocity

Math
the peak of the jump lies on the axis of symmetry of the parabola ... x = -b / 2a = -21 / (2 * -16) time up equals time down time of flight (jump) = 2 * 21/32

Chem: please help
new conc = old conc * 15/50

Chemistry help!!
new conc = old conc * 15/50

math
? * (5/2)^2 * (8/2) * 10^6

Chemistry
i think you're right

Maths
2 (x^3 + 6^3) the sum of cubes is a standard factoring

math
the area for the measurements you give is not listed see "Heron's Formula"

Math1
100 (1 + .04)^12

math
.08 f + .05 s = 1330 .12 f + .02 s = 1500 solve the system using elimination or substitution

Calculus
integrate the derivatives Y"=6 ... y' = 6 x + c ... 4 = 6 * 1 + c ... c = -2 y' = 6 x - 2 ... y = 3 x^2 - 2 x + c ... 6 = 3 - 2 + c ... c = 5 y(x) = 3 x^2 - 2 x + 5

physics
a = v / t d = 1/2 a t^2

physics/maths help damon or steve or scott
6 V0 + 18 a = 246 V0 + 9 a = V1 3 V1 + 4.5 a = 69 subs ... 3 V0 + 27 a + 4.5 a = 69 ... times 2 ... 6 V0 + 63 a = 138 subtract to eliminate V0 ... 45 a = -108 ... a = -2.4 substitute back to find V0

Physics
the time of flight is the time it takes for the car to fall the difference in elevation of the two sides 21.3 - 1.8 = 1/2 * 9.8 * t^2 find t the car has to travel 61 m in time t the car's horizontal velocity is constant its vertical velocity increases due to falling ... Vv...

Physics
the energy is proportional to the SQUARE of the compression 4^2 = ?

Math
multiply the percentage (as a decimal) by the total number of students (500) to find out the numbers for the various sports then subtract the basketball number from the football number

Math
the built in Windows calculator (in scientific mode) works pretty well

Math
there are 365 compounding periods per year [1 + (.03 / 365)]^365 = 1 + APY

chem
the pressure is proportional to the absolute (Kelvin) temperature 1.89 / (24.0 + 273) = p / (38.0 + 273)

SCIENCE
for EQUAL branches total r = branch r / # of branches

Math
5.00 + (0.65 * x) = 10.00 + (0.45 * x) .20 x = 5.00

Physicd
7 N?s - 5 N?s = 2 N?s m v = 2 N?s m = 2/5 kg

Algebra
the slope means that the candle shortens by .4 cm per hour of burning how much taller would it be nine hours earlier? (how much did it shrink in nine hours?)

math
s + c = 72 / 3 s - c = 72 / 4 add the equations (to eliminate c) solve for s substitute back to find c

math
m?CAB = m?CBA = 30º m?BCM = 90º BM = 24 ... 30-60-90 TRIANGLE AM = CM

science
RL and LR are brown eyed but carry the blue recessive they represent half of the population

math
there are two "integer" multiples of 2 A 0.25 = 2^-2 B .05 = 2^-1

Maths
each component has an 80% chance of being good so the probability of a good (not defective) product is ... .8^4 probability of a defective product is ... 1 - .8^4

Physical Science
pH + pOH = 14 pOH = 12 [OH] = 10^-12

Pre-cal
s = 2 f - 5 s + f^2 = 115 f^2 + 2 f - 5 = 115 f^2 + 2 f - 120 = 0 (f + 12)(f - 10) = 0 f - 10 = 0 ... f = 10

Math
did you see the two sig fig part? 210000

SCIENCE
think you're right

Maths
the 8th term is 5 differences from the 3rd term, and 7 differences from the 1st term e = 2 t = 2 (f + 2 d) f + 7 d = 2 f + 4 d ... 3 d = f sum8 = 8 f + 28 d = 39 substituting ... 24 d + 28 d = 39 ... 52 d = 39 ... d = 3/4 substitute back to find f

math
there are 36 inches in a yard 580 / 36 = ?

11 grade / physics
Vv = V sin(30º) = ?(2 g h) Vh = V cos(30º) = Vv / tan(30º)

Chemistry
for the given volumes (22.5 + 22.5) * (30.17 - 23.50) * 1.00 ... * 4.184

Chemistry 11
looks fine

Math
the area is the average of the bases, multiplied by the height divide the area by 12 to find the number of boxes needed remember to round up to the next WHOLE number, if necessary

Chemistry
temp change times mass of H2O times specific heat of H2O (37.8 - 21.6) * 100 * 4.179 remember sig fig

Physics
momentum is conserved Mb * Vi = (Mb + Mw) * Vf Vi = (.005 + 8) * 0.50 / .005

Physics
frictional force is the normal force multiplied by the coefficient in this case ... Ff = Ma * g * 0.25 the frictional force keeps A moving with B ... so the max acceleration (without slip) is ... Ma / Ff the max force is the max acceleration multiplied by the sum of the masses...

Physics
1/2 m (v sin(60º)^2 = m g 10 km v = ?(g * 20 km) / sin(60º) this is the minimum velocity for the projectile to reach the height of the plane ... faster would be better

Physics
the weight change in the kerosene is the weight of kerosene displaced by the solid if the solid were kerosene, its weight would be 1.6 g ... (4.8 - 3.2) so the density ratio is ... 4.8 / 1.6

Chemistry
in (a) and (b), the hydroxides are probably in solution and the hydrogen is evolved as a gas

pre calc
the full solution is in the related questions at the bottom of the page

pre calc
the two given population numbers only have one significant digit either 670000 or 700000 is what the computer is looking for

Chemistry
the drops happen, but are not counted the fewer the drops to the endpoint, the lower the concentration of the unknown the concentration would appear to be lower than it actually is

physics!
velocity = circumference / period v = (2 * ? * 11.30 m) / 16.60 s plug it in and crank the crank

pre calc
1.7 = e^0.01t ln(1.7) = 0.01 t 100 ln(1.7) = t

Math
(300 * 200) - (280 * 180)

Physics
the centripetal acceleration is ... v^2 / r a) v^2 / r = g ... v^2 = 500 m * 9.8 m/s^2 b) his weight will be twice normal ... w = 2 * 80 * g

physics
95 km/h = 26.4 m/s 26.4 / 4.2 = stopping time (26.4 + 0) / 2 = ave stopping speed

Math
y varies inversely with x ... x y = k 25 * 5 = 125 ... x y = 125

math
the solution is the intersection of the lines

Physics
f = 1 / cycle time = 1 / (34.8 / 15)

pre calc
100 * 1/2 * 1/2 = 25 12 days = 2 half lives OR 1/4 = e^(12k) ln(1/4) = 12 k [ln(1/4)] / 12 = k ln(1/2) = k t t = ln(1/2) / {[ln(1/4)] / 12} = 6

geometry
it gives you the size of the interior angles of a regular polygon of n sides

math
90º is a quarter of a circle 1/4 * 1/4 = ?

Algebra
.9 x + 6.8 = .65 x + 7.3

science
the weight (force) of 50 kg is ... 50 kg * g ... g is the acceleration by gravity 200 * d = 50 * g * (2 - d)

Pre calc
pop = 900000 * k^t 800000 = 900000 * k^2 8/9 = k^2 ... k = 2?2 / 3 p = 900000 * (2?2 / 3)^5

Math
no ... is imaginary ... and irrational

Math
no ... is imaginary

science
a = f / m = 5224700 / 13500

Algebra
the corners are now three times farther from the origin just multiply each coordinate by 3

Physics
the beam weight is 50.3 N/m when Suki crosses a support to some distance (d), the equilibrium equation is ... (100.6 N * 1.00 m) + (595 N * d) ... = (251 N * 2.50 m) the distance from the end is ... 2.00 m - d

Algebra2
this is a circle, centered at the origin the domain and range are the same

Math ASAP
looks good

Math
180º - 65º - 65º = ?

Calculus
d = 2 r = 3 h ... r = 3/2 h v = 1/3 * ? * r^2 * h v = ?/3 * 9 h^3 / 4 dv = 9 ? h^2 dh / 4 dh = 4 dv / (9 ? h^2)

Physics
the incident angle is measured relative to the normal to the surface 90º - 60º = 30º

Physics!
.4 * 3000 = f (in Joules) 1) ma = 0utput / input = 3000N / 1000N 2) not enough info

Math
n, n+2, n+4 4(n+2) = n + n+4 + 2

Physics
that is the compression of the spring the more it's compressed, the greater the force

Physics
f = m a ... a = f / m a = (315 N * .15) / .00446 kg a is in m/s^2

Physics
ave speed = 1.4 rad/s stop time = 2 * ? * 60 / 1.4 acceleration = 2.8 rad/s / stop time ... negative ... wheel is stopping 30 * 2 * ? = 1/2 a t^2 + 2.8 t ... solve for t

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