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March 27, 2017

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Posts by scott

Total # Posts: 1,996

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
March 26, 2017

Physics
looks actually correct to me
March 26, 2017

pre calc
because i made a typo...
March 26, 2017

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)
March 26, 2017

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
March 26, 2017

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
March 26, 2017

math
twice the teeth means half the revolutions teeth * speed = k = 48 * 3 = 144 96 * s = 144 ... s = 144 / 98
March 26, 2017

physics
nope E friction from the tires and normal force from the banking
March 26, 2017

Math
looks like a glass/class typo 2/3 of 30.9 kg 2 * 30.9/3 = ?
March 26, 2017

Pre calc DUE TOMRROW
i mis-transposed the 43º ... it should be 46º
March 26, 2017

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)
March 26, 2017

geometry
use ... a^2 + b^2 = c^2 ... twice
March 23, 2017

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
March 23, 2017

physics
google "uniform circular motion" look at the diagrams on wikipedia
March 23, 2017

Math
time = distance / velocity
March 22, 2017

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
March 22, 2017

Chem: please help
new conc = old conc * 15/50
March 22, 2017

Chemistry help!!
new conc = old conc * 15/50
March 22, 2017

math
? * (5/2)^2 * (8/2) * 10^6
March 22, 2017

Chemistry
i think you're right
March 22, 2017

Maths
2 (x^3 + 6^3) the sum of cubes is a standard factoring
March 22, 2017

math
the area for the measurements you give is not listed see "Heron's Formula"
March 22, 2017

Math1
100 (1 + .04)^12
March 22, 2017

math
.08 f + .05 s = 1330 .12 f + .02 s = 1500 solve the system using elimination or substitution
March 22, 2017

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
March 22, 2017

physics
a = v / t d = 1/2 a t^2
March 22, 2017

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
March 22, 2017

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...
March 22, 2017

Physics
the energy is proportional to the SQUARE of the compression 4^2 = ?
March 22, 2017

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
March 21, 2017

Math
the built in Windows calculator (in scientific mode) works pretty well
March 21, 2017

Math
there are 365 compounding periods per year [1 + (.03 / 365)]^365 = 1 + APY
March 21, 2017

chem
the pressure is proportional to the absolute (Kelvin) temperature 1.89 / (24.0 + 273) = p / (38.0 + 273)
March 21, 2017

SCIENCE
for EQUAL branches total r = branch r / # of branches
March 21, 2017

Math
5.00 + (0.65 * x) = 10.00 + (0.45 * x) .20 x = 5.00
March 20, 2017

Physicd
7 N?s - 5 N?s = 2 N?s m v = 2 N?s m = 2/5 kg
March 20, 2017

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?)
March 20, 2017

math
s + c = 72 / 3 s - c = 72 / 4 add the equations (to eliminate c) solve for s substitute back to find c
March 19, 2017

math
m?CAB = m?CBA = 30º m?BCM = 90º BM = 24 ... 30-60-90 TRIANGLE AM = CM
March 19, 2017

science
RL and LR are brown eyed but carry the blue recessive they represent half of the population
March 18, 2017

math
there are two "integer" multiples of 2 A 0.25 = 2^-2 B .05 = 2^-1
March 16, 2017

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
March 16, 2017

Physical Science
pH + pOH = 14 pOH = 12 [OH] = 10^-12
March 15, 2017

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
March 15, 2017

Math
did you see the two sig fig part? 210000
March 15, 2017

SCIENCE
think you're right
March 15, 2017

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
March 15, 2017

math
there are 36 inches in a yard 580 / 36 = ?
March 15, 2017

11 grade / physics
Vv = V sin(30º) = ?(2 g h) Vh = V cos(30º) = Vv / tan(30º)
March 15, 2017

Chemistry
for the given volumes (22.5 + 22.5) * (30.17 - 23.50) * 1.00 ... * 4.184
March 15, 2017

Chemistry 11
looks fine
March 15, 2017

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
March 14, 2017

Chemistry
temp change times mass of H2O times specific heat of H2O (37.8 - 21.6) * 100 * 4.179 remember sig fig
March 14, 2017

Physics
momentum is conserved Mb * Vi = (Mb + Mw) * Vf Vi = (.005 + 8) * 0.50 / .005
March 14, 2017

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...
March 12, 2017

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
March 12, 2017

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
March 12, 2017

Chemistry
in (a) and (b), the hydroxides are probably in solution and the hydrogen is evolved as a gas
March 11, 2017

pre calc
the full solution is in the related questions at the bottom of the page
March 11, 2017

pre calc
the two given population numbers only have one significant digit either 670000 or 700000 is what the computer is looking for
March 11, 2017

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
March 11, 2017

physics!
velocity = circumference / period v = (2 * ? * 11.30 m) / 16.60 s plug it in and crank the crank
March 11, 2017

pre calc
1.7 = e^0.01t ln(1.7) = 0.01 t 100 ln(1.7) = t
March 11, 2017

Math
(300 * 200) - (280 * 180)
March 11, 2017

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
March 11, 2017

physics
95 km/h = 26.4 m/s 26.4 / 4.2 = stopping time (26.4 + 0) / 2 = ave stopping speed
March 10, 2017

Math
y varies inversely with x ... x y = k 25 * 5 = 125 ... x y = 125
March 10, 2017

math
the solution is the intersection of the lines
March 10, 2017

Physics
f = 1 / cycle time = 1 / (34.8 / 15)
March 10, 2017

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
March 10, 2017

geometry
it gives you the size of the interior angles of a regular polygon of n sides
March 10, 2017

math
90º is a quarter of a circle 1/4 * 1/4 = ?
March 10, 2017

Algebra
.9 x + 6.8 = .65 x + 7.3
March 10, 2017

science
the weight (force) of 50 kg is ... 50 kg * g ... g is the acceleration by gravity 200 * d = 50 * g * (2 - d)
March 10, 2017

Pre calc
pop = 900000 * k^t 800000 = 900000 * k^2 8/9 = k^2 ... k = 2?2 / 3 p = 900000 * (2?2 / 3)^5
March 9, 2017

Math
no ... is imaginary ... and irrational
March 9, 2017

Math
no ... is imaginary
March 9, 2017

science
a = f / m = 5224700 / 13500
March 9, 2017

Algebra
the corners are now three times farther from the origin just multiply each coordinate by 3
March 9, 2017

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
March 8, 2017

Algebra2
this is a circle, centered at the origin the domain and range are the same
March 8, 2017

Math ASAP
looks good
March 8, 2017

Math
180º - 65º - 65º = ?
March 8, 2017

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)
March 8, 2017

Physics
the incident angle is measured relative to the normal to the surface 90º - 60º = 30º
March 8, 2017

Physics!
.4 * 3000 = f (in Joules) 1) ma = 0utput / input = 3000N / 1000N 2) not enough info
March 7, 2017

Math
n, n+2, n+4 4(n+2) = n + n+4 + 2
March 6, 2017

Physics
that is the compression of the spring the more it's compressed, the greater the force
March 6, 2017

Physics
f = m a ... a = f / m a = (315 N * .15) / .00446 kg a is in m/s^2
March 6, 2017

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
March 6, 2017

Precalc
look at half the center 3rd it is a sector of the circle, with right triangles on either side the area of the sector is ... ? * r^2 * (?/360) ... ? being the central angle the combined area of the two triangles is ... r sin(?/2) * r cos(?/2) = r^2 tan(?/2) ? r^2 / 6 = r^2 [tan...
March 6, 2017

math
PEMDAS is the hierarchy of operations Parentheses...exponentiation ...multiplication...division ...addition...subtraction things in parentheses 1st ... 7^2 = 49 ...4 * 10 = 40 ...40 - 49 = -9 7 * -9 = -63 -63 + 4 = -59
March 6, 2017

math
.18 x + .40(10 - x) = .20 * 10
March 5, 2017

Math
like slicing bologna trees are cut on a "bias" to control the direction of fall
March 5, 2017

Math - Trig
Two buildings of equal height are 850 feet apart. An observer on the street between the buildings measures the angles of elevation to the tops of the buildings as 29° and 40°. How? high, to the nearest? foot, are the? buildings? I don't know how to set this up
March 5, 2017

Trig
the angle at the base of the pole is ... 90º - 8º the angle at the end of the shadow is the sun's angle the 3rd angle is opposite the 20 ft shadow use the law of sines to find the pole
March 5, 2017

Physics
the energy to lift the water is ... m g h = 10 kg * 10 m/s^2 * 10 m ... = 1000 J the kinetic energy of the water at delivery is ... 1/2 m v^2 ... = 1/2 * 10 kg * (10 m/s)^2 ... = 500 J 1500 J / s = 1500 watts = 1.5 kw
March 5, 2017

math
(1 - .75) * ? * 4 * r^2
March 4, 2017

maths
like the other one ... 5-12-13 tan = 12/5 sin = 12/13 cos = 5/13 cos(90 - ?) = sin (?) fyi ... holding down the 'alt' key while typing '233' will generate the '?'
March 4, 2017

maths
this is a 5-12-13 triangle cos = 5/13 tan = 12/5
March 4, 2017

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