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March 23, 2017

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Posts by Scott

Total # Posts: 1,985

algebra
.....4b^2 + 2b + 1 ....._____________________ 2b-1 [8b^3 + 0b^2 + 0b - 6 ......8b^3 - 4b^2 .............4b^2 + 0b .............4b^2 - 2b ....................2b - 6 ....................2b - 1 .........................5 remainder
January 11, 2017

Science
maybe look at B?
January 9, 2017

Trig
cos = ?(1 - sin^2) 0 + ?/2 < x + y < ?/2 + ? ... ?/2 < x + y < 3?/2 the sign of the solution will be neg
January 4, 2017

Algebra 2
each year, the number of trucks is 110% of the previous year T(r) = 100 * (1 + .10)^r
January 4, 2017

Science
distance = 1/2 a t^2 871 = 25 a gravitational force must be overcome f - g = m a = 5 a f = 5 a + g
January 4, 2017

Physics
d = 1/2 a t^2 10.0 * 2 = a * 2.65^2 calculate the gravitational acceleration (a) ... f = m a ... f / m = a f = M * m * G / r^2 ... f / m = M * G / r^2 ... a = M * G / r^2 M is the planet's mass G is the universal gravitation constant r is the planets radius (in meters)
January 3, 2017

Physics
100 kg/s energy (work) = m * g * h ... = 100 kg * 9.8 m/s^2 * 100 m ... = Joules energy / time = power ... Joule / s = watt
January 2, 2017

Spanish
hola ipap da loemlo
December 18, 2016

Math Homework
looks good
December 17, 2016

Math
.03 j = .05 s j = s + 500
December 9, 2016

Math
Will you marr... me
December 9, 2016

Math
x + y = 24 y + 12 = z x + y + 12 = 36 x + z = 36 (x + z) / 2 = 18
December 9, 2016

Physics
w = f * d Newtons * Meters = Joules
December 8, 2016

Algebra
18 - 7 17 - 8 16 - 9 15 - 1 14 - 2 13 - 3 12 - 4 11 - 5 10 - 6
December 8, 2016

Physics
radius is half the diameter
December 8, 2016

Algebra
m = (y2 - y1) / (x2 - x1) if x and y change in the SAME direction (up or down), then the slope is positive if they change in opposite directions, the slope is negative -5/-3 is not the same as -5/3 ... one is positive, the other negative
December 8, 2016

math
60 seconds in a minute
December 8, 2016

physics
w = f * d (Joules, in this case)
December 8, 2016

Probability Help
there are [(40 * 39) / 2] separate pairs of people the probability of two people not having the same birthday is (364 / 365) the probability that none of the group have the same birthday is ... (364 / 365)^(20 * 39)
December 8, 2016

Algebra
s + a = 350 1s + 3a = 450 elimination looks pretty good
December 7, 2016

Physic
constant velocity - no acceleration net force is zero friction and push cancel each other
December 7, 2016

Physics
figure???
December 7, 2016

math
point-slope Y - y1 = m (X - x1)
December 7, 2016

Geom A
6. try again the sides are in the same size order as their opposite angles <C is the largest, so AB is the largest side 7. try again any one side must be LESS THAN the sum of the other two sides
December 7, 2016

Algebra
There is no twins age given, sorry, this is the full question
December 7, 2016

Algebra
I am 6 years older than my wife. Our twins go to the local comprehensive school. One of the twins noticed that the sum of their ages divided into the product of my age and the age of my wife is 63. How old am I?
December 7, 2016

math
looks good
December 6, 2016

Calculus applications
The bending moment (M) along a beam is M = WLx/2 -Wx2/2 kNm where x is the distance of a beam length L from the left hand end. W is the weight per unit length. (a) Shear force is calculated as the differential of bending moment. Find an expression for shear force and determine...
December 5, 2016

Math
how can the perimeter be less than the diagonal? you found one of the sides...the perimeter is all four
December 4, 2016

Algebra
d + n = 28 10d + 5n = 195 solve the system ... substitution or elimination
December 4, 2016

math algebra
you have everything you need just crank the crank
December 4, 2016

math
2 = [1 + (p / 100)]^2 ?2 = 1 + (p / 100)
December 4, 2016

Maths
try nesting polygons ... going from the outside in connecting adjacent points gives 64 sides (chords) every other point gives 32 sides every 3rd point. etc...
December 3, 2016

Physics
a) looks good b) you know the kinetic energy at the top ... just add the gravitaional potential (mgh) across the loop to find the bottom speed
December 3, 2016

Math
14 * 13 * 12 * 11 * 10 * 9 * 8 * 7 * 6 1st student has choice of 14 chairs ...2nd student, 13 chairs ... yada, yada
December 2, 2016

Maths
the horizontal component of P (along the rod) is [P * cos(30º)] the vertical component is [P * sin(30º)] the normal reaction is the block's weight (m * g), minus the vertical component of P you surmise correctly re: the result of P exceeding 392 Newtons
December 2, 2016

Interest
4000 * [1 + (.05 / 12)]^(5 * 12)
December 1, 2016

physics
1/2 * m * v^2 = 1/2 * .058 * 58 answer is in Joules
December 1, 2016

physics
a = f / m kg and N means m/s^2
December 1, 2016

Physics
? may be 3º ... the wording is ???
November 30, 2016

Algebra 2
good chioce
November 30, 2016

math
the 54th term is 50 differences from the 4th term
November 30, 2016

Math
m + n = 3 ... n = 3 - m m * n^2 = m * (3 - m)^2 ... = m^3 - 6 m^2 + 9 m the max appears to be infinite
November 30, 2016

Science
yes, gravity counts 22 / (10 * g)
November 30, 2016

Algebra 1 B
2 is good 3 needs work
November 30, 2016

physics
not sure about impossible... this is around escape velocity
November 29, 2016

physics
centripetal acc = v^2 / r ... v is the tangential velocity 16.7 = v^2 / 6.41E6 v / r = angular velocity (in radians)
November 29, 2016

algebra
n = 1000 * e^(.11 * 2)
November 29, 2016

Calculus
s(t) = -16t^2 + 1600 t the time of max height is on the axis on symmetry ... t = -1600 / (2 * -16) the slope of the tangent (1st deriv) is equal to zero at max height
November 29, 2016

geometry
looks like the line segment was doubled scale factor is two
November 29, 2016

science
molar mass of Bi is 208.98 g ... so there are 2 moles of Bi 6 moles of F will react to form BiF? the molar mass of F is 19.0 g add the mass of the Bi and the mass of the F to find the grams of BiF?
November 29, 2016

Chemistry
conservation of mass
November 29, 2016

Math
15.85 + .75 = 3n + 2(3.95) + 1.23
November 29, 2016

Math
1. n 2. 2n 3. 2n + 5 4. 100n + 250 ... moves chocolate times into hundreds place 5. 100n + [2016 or 2015] ... sets up #6 to yield age 6. 100n + age [(50[2(n)+5])+176?]-birth year
November 29, 2016

algebra
thanks for the catch, Reiny too late to be working on this stuff
November 27, 2016

algebra
(90 / c) + [130 / (c + 20)] = 4 90 c + 180 + 130 c = 4 c^2 + 80 c c^2 - 35 c - 45 = 0 use quadratic formula to find c
November 27, 2016

6 grade math area perimeter
area looks good perimeter might be 16 ... check it
November 27, 2016

6 grade math area perimeter
looks good
November 27, 2016

Physics
it accelerates for 4 s ... up to 8 rad/s then spins for 11 s ... 88 rad the ave vel during acceleration is ... ) + 8) / 2 = 4 rad/s ... spins 16 rad 104 rad total ... divide by 2? to find revolutions
November 27, 2016

calculus
the friend's distance north is 30 t your distance east is ... 40 - 20 t it's a right triangle use Pythagoras to find the hypotenuse ... which is the distance find the minimum - with respect to t
November 26, 2016

Physics
the centripetal force (m v^2 / r) is equal to the gravitational force ... G M m / r^2 v^2 = G M / r ... = 6.67E-11 * 5.98E24 / 7.12E6 the period is the speed divided into the orbital circumference
November 26, 2016

Physics , static fluids
the ice is 92% as dense as the water so 92% of the block is submerged when it floats that leaves 8% exposed
November 26, 2016

Algebra
s + L = 40 s + 6 = L subtracting the equations ... eliminating s L - 6 = 40 - L
November 26, 2016

Physics
the supports each exert 98 N to support the plank one support exerts [490 N * m / 3] to support the person the other support exerts ... 490 N - [490 N * m / 3]
November 26, 2016

Physics , static fluids
the buoyancy force is the difference in the air weight and immersed weight
November 26, 2016

Physics , static fluids
hello (again) 8.6 meters is 860 cm if you picture a stack of 860 cm cubes of water, what is the force at the bottom? ... 860 gm * g ... this is the force on one cm^2 .86 kg * 9.8 m/s^2 = f a Pascal is one Newton per m^2 ... a kPa is .001 N per cm^2
November 26, 2016

Physics
you can use the density of water and the depth to find the pressure the "rule of thumb" for diving is one atmosphere for every ten meters of depth
November 26, 2016

Physics
e = 1/2 k x^2 ... (kind of like KE) 2.0 = 1/2 * 100 * x^2
November 25, 2016

Physics
look up Doppler shift formula
November 25, 2016

Maths
2 = (1 + .06)^t log(2) = t log(1.06) t = [log(2)] / [log(1.06)]
November 23, 2016

Algebra 2 (Please help Ms. Sue!)
use synthetic division
November 23, 2016

Algebra
(d / 55) + (d / 35) = 50 - 10
November 22, 2016

Physics
momentum is conserved find the momenta in x and y for the two decay products the two y momenta add to zero, and the two x momenta equal the original add the vectors to find the 234Th velocity
November 22, 2016

pre calc
100% - 30% = (1/2)^(2 / h) log(.7) = (2 / h) log(1/2) h = 2 log(1/2) / log(.7) (after a week) = (1/2)^(7 / h)
November 22, 2016

Algebra
it stops at the top, so the average velocity is ... (103 + 0) / 2 gravitational acceleration is 32 ft/s^2 , downward so the time to reach the peak is ... 103 ft/s / 32 ft/s^2 r * t = d
November 22, 2016

Physics
momentum is conserved, so the truck's loss is the car's gain 7500 kg-m/s / 750 kg = ?
November 22, 2016

physics
radio waves travel at the speed of light (c) ... 3E8 m/s the distance from Venus to Earth depends on where each planet is in its orbit around the Sun
November 22, 2016

technical drawing
85 m is 85000 mm 85000 mm / 10000 = ?
November 22, 2016

science
x + y = 10 3.1 x + 2.5 y = 25 solves easily by inspection (observation)
November 21, 2016

physics
6000 Nm/s = 6 kw
November 21, 2016

Physics
the object displaces 1/5 of its weight in water, so it is 5 times the density of water the weight change in the other liquid is 2/3 of the change in water, so the other liquid is 2/3 the density of water
November 21, 2016

Chemistry
the Ar will effectively be "squeezed" into 80% of its previous volume this will increase the tank pressure to 125% of the original the pp of Ar is 80% of the total the pp of nitrogen is 20%
November 20, 2016

Physics
F accelerates the three boxes equally since C is half of the total system mass, F equals twice the force on C
November 20, 2016

physics
the initial vertical velocity is ... 50 m/s * sin(37º) the (vertical) freefall equation is . h = 1/2 g t^2 + [50 sin(37º)] t + 55 plug in zero for h (ball on ground) and solve for t (use quadratic formula) the horizontal velocity is ... 50 m/s * cos(37º) ... ...
November 20, 2016

math
the intercepts are points with x and y coordinates for x-intercepts, the y coordinates are zero...but they still exist
November 20, 2016

Physics
avg vel = (14 + 0) / 2 = 7 rev/s stop time = 1/7 s distance = 1/2 a t^2 ... 1 = 1/2 * a * (1/7)^2
November 20, 2016

Maths
6 pts total per event 24 pts total awarded...so 4 events Betty has three 1st's and a 2nd Cathy has a 2nd and three 3rd's
November 20, 2016

physics
momentum (as usual) is conserved .05 * v = (5 + .05) * 10
November 17, 2016

applied physics
g = -980 cm/s^2 the object reaches its peak at 2 s average velocity is 980 cm/s ... so peak height is 1960 cm time up equals time down
November 16, 2016

Physics
KE = 1/2 m vB^2 6 KE = 1/2 * m/2 * vA^2 12 = (vA / vB)^2
November 16, 2016

Physics
twice the force, twice the stretch
November 16, 2016

Math
what design?
November 16, 2016

Algebra
the general equation is ... x = a(y - k)^2 + h the vertex is at the origin, so h and k are both zero a = 1 / 4p ... where p is the distance from the vertex to the focus b) the center depth is the value of x at the edges of the dish (where y equals ±7)
November 16, 2016

Physics
the acceleration (j) of the jet and gravitational acceleration (g) are two sides of the triangle j / g = tan(25º) ... j = 9.8 m/s^2 * tan(25º) multiplying j by 11 s will give the takeoff speed
November 16, 2016

Psychics
d = 1/2 a t^2 88.3 = 1/2 * 23.6 * t^2
November 16, 2016

Math
your "weird" answer is correct
November 15, 2016

Math
An = [10 * 3^(n-1)] + 1
November 15, 2016

Technology
the moments about the fulcrum must be equal for balance moment = mass * distance from fulcrum
November 15, 2016

university physics
momentum is conserved with the pellet/block find the velocity of the pellet/block the KE of the p/b is the work that compresses the spring 1/2 m v^2 = 1/2 k x^2
November 15, 2016

Differential calculus
the general vertex form is ... y = a(x - h)^2 + k ... (h,k) is the vertex a = 1 / 4p ... p is the distance from the directrix to the vertex
November 14, 2016

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