Monday
February 27, 2017

Posts by Scott

Total # Posts: 1,848

Geometry
5 b + 5 b + b = 121
January 24, 2017

Physics
you're not accelerates to 12 m/s, then travels for 20 s ... that's 240 m, plus the acceleration distance d = 1/2 a t^2
January 24, 2017

Geometric Progression.
(x + 9) / x = (x + 22.5) / (x + 9) x^2 + 18 x + 81 = x^2 + 22.5 x 81 = 4.5 x a1, a2, 18, 27, 40.5
January 24, 2017

Physics/Energy
work = m g h the time is only a factor for power calculation
January 24, 2017

Math
60x + y = 87.15 subtracting equations ... 30x = 33.60 substituting ... 33.60 + y = 53.55 ... y = 19.95
January 22, 2017

Matha
compounding period?
January 22, 2017

Physics
KE = 1/2 m v^2 m = .02 kg v = (200000 / 3600) m/s answer is in Joules
January 22, 2017

physics
1/2 m v^2 = m g h h = v^2 / (2 g)
January 22, 2017

Physics
the same depth means the same pressure at the bottom the forces are equal
January 22, 2017

science
K.E. is proportional to the square of the velocity this means that the energy change from 80 kph to 70 kph is greater than the change from 10 kph to zero use (1/2 m v^2) to find the energies the lost energy (from braking) is usually frictional (heat)
January 21, 2017

Maths
each cut results in a cake that is 3/4 of the size before the cut starting with a whole cake (1) after 3 cuts ... 1 * (3/4) * (3/4) * (3/4)
January 21, 2017

physics
his energy at the bottom is the change in potential energy, minus the work of friction ... m * g * h - 520 * h ... E = (88 kg * 9.8 m/s^2 - 520 N) * 5.9 m his velocity is (from K.E. equation) ... v = ?(2 * E / m) while he is slowing down, his average velocity is ... (v + 0) / ...
January 20, 2017

math
2 x^2 + 13 x - 84 = 0 use the quadratic formula
January 19, 2017

science
the molar mass of sulfur is 32.1 g there are 6.02E23 atoms in a mole of sulfur (10.0 / 32.1) * 6.02E23
January 19, 2017

Chemistry
1. -3 means 3 "extra" electrons ... this element is atomic number 7 2. +2 means 2 "lost" electrons ... this element is atomic number 20 3. column 2, row 3
January 18, 2017

math
30 m / x = tan(78º)
January 18, 2017

math
[1 - (5/8)] * [1 - (1/6)]
January 18, 2017

Geometry
the x-distance from p1 to p2 is ... 6 - -4 the y-distance from p1 to p2 is ... 9 - -7 divide the distances by 4 to find the "length" of each step start at p1 and add consecutive steps to find the 3 division points
January 18, 2017

algebra
biologists use a Punnett square to show the geneotypes if both parents are RL, the following outcomes are equally probable ... RR, RL, LR, LL
January 18, 2017

math
2.1 = a [1/2^(1000/24360)] log(2.1) = log(a) + (1000/24360)log(1/2) 2.1606 ?
January 18, 2017

MATH HELP
the other 4 committee members come from the group of 6 faculty and 2 students ... 8C4 number of ways is ... 6P2 * 8C4
January 18, 2017

Math
a 5x5 grid has 25 blocks each block is 1/25 or 4% how many blocks for 24%
January 18, 2017

Maths
45 L is 45000 cm^3 (45000 / 2) seconds
January 18, 2017

Pre-cal/trig
the rope reaches around the corner on the 18 ft side, but not on the 22 ft side so the area is half of a 42 ft dia circle, plus a quarter of a 6 ft dia circle
January 18, 2017

Math
L = 3 T L + 15 + T + 15 = 38 substituting ... 3T + 15 + T + 15 = 38 = 4 T + 30 solve for T, then substitute back to find L
January 18, 2017

Chemistry
commercial ice cream is agitated more vigorously to aerate the mixture and increase the volume you pay for air that the manufacturer gets for free the product should probably be sold by weight, not volume
January 17, 2017

Algebra
Jacinda appears to be running 10 minute miles ... 6 mph after 1 hr, Raj has gone 6 mi ... that's when Jacinda catches him
January 17, 2017

Physics
momentum is conserved 4500 * 17.5 = v * (4500 + 1350)
January 17, 2017

physics
energy = m g h 3.9E5 = 1.3E3 * g * h
January 17, 2017

physics
friction force = centripetal force ? m g = m v^2 / r ? = v^2 / (g r)
January 17, 2017

Physics
the dimensions are given to 3 sig fig ... that's what the answer should have 1 m^3 = (3.28 ft)^3 v = 43 * 18 * 15 * 3.28^3 ft^3 ... use 3 significant figures in the answer
January 17, 2017

serial dilutions
the mix is 1.5 diluent to .5 solution each dilution results in a solution that is 1/4 the concentration of the added solution ... .5 mL / (.5 mL + 1.5 mL)
January 17, 2017

Algebra 2
?n = n^(1/2) ?(8 x^3 y^5)
January 17, 2017

Algebra 2
(7x-2)^1/4 = 5 7x - 2 = 625
January 17, 2017

Math
horizontal (x) component ... magnitude * cosine vertical (y) component ... magnitude * sine
January 17, 2017

Algebra
try this (.08 * x) + [.07 * (x - 1400)] = 217
January 17, 2017

Physics
h = 1/2 g t^2 ... ?(2h/g) = t the time is directly related to the square root of the height
January 17, 2017

Physics
cable exerts an upward force gravity exerts a downward force find the net force a = f / m
January 17, 2017

Math
the difference is -7 the 5th term is 10 differences before the 15th term
January 16, 2017

physics
average velocity during penetration is ... (500 + 0) / 2 time = distance / velocity
January 16, 2017

science
impulse is the change in momentum over time
January 16, 2017

physics
the force of the Earth on the ball is the same as the ball on the Earth f = m a use the drop time to find the velocity v = a t
January 16, 2017

Math
horizontal means zero slope set f' equal to zero and solve for x
January 16, 2017

College Math - Quantitative Reasoning
.93^3 = .804357 1 - .804357 = .195643 rounds to 19.6%
January 16, 2017

College Math - Quantitative Reasoning
what do you think is the right answer? the problem statement is not correct your calculations are fine
January 16, 2017

Physics
(a) looks good part (b) may be a "trick" question velocity is a vector quantity, while speed is a scalar the answer might be zero
January 15, 2017

Chemistry
sounds like hydrogen peroxide
January 15, 2017

Math
your work looks okay C1 is 60 times C2 ... so V1 should be 1/60 of V2
January 15, 2017

Chemistry - Enthalpy
the tea (water) loses the energy gained by the spoon 250.0 * (90.00 - 85.00) * 4.184 4 sig fig ... not 5 as in your answer
January 14, 2017

Physics
1/2 * 68.6 * (4.92^2 - 1.12^2)
January 14, 2017

maths
the whole circle is 2? ... or 20?/10 3?/10 - 20?/10 = ?
January 13, 2017

math
2L + 2W = 52 L = W + 4 substituting ... 2(W + 4) + 2W = 52 4W + 8 = 52
January 13, 2017

algebra 2
7C3 * 5C3
January 12, 2017

algebra 2
16000 is 4000 above the average 4000/3200 = 1.2 sd use a z-score table to find the probability
January 12, 2017

Science
an oxide ion will take on two electrons calcium has two valence electrons potassium has one valence electron
January 12, 2017

Grade 6, percentage
70% of (840 minus boys) ... equals ... 60% of 840 588 - .7b = 504 84 = .7b
January 12, 2017

algebra
s + p = 330/11 = 30 s - p = 330/15 = 22 adding eqns ... 2s = 52
January 12, 2017

Math
correction ... 5/2 m = 2.25
January 12, 2017

Math
3b + 2m = 7 2b + 5m = 6.50 solve the system by substitution or elimination 2nd eqn times 3/2...3b + 15/2 m = 9.75 subtracting (to eliminate b) ... 5/2 m = 3.25
January 12, 2017

PLEASE HELP BEEN STUCK ALL DAY CALCULUS
nominal ... ? * 4^2 * 12 max ... ? * 4.2^2 * 12 min ... ? * 3.8^2 * 12 units are in^3
January 11, 2017

physics
a = f / m = (16890 - 1010) / 1450
January 11, 2017

Algebra 2
the factor is ... [1 + (% change)]^(years) 1 + .70 1 - .75
January 11, 2017

Algebra
the variable is to the 1st power so, yes
January 11, 2017

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

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