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Posts by Scott

Total # Posts: 2,121

physics
friction force = centripetal force ? m g = m v^2 / r ? = v^2 / (g r)

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

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)

Algebra 2
?n = n^(1/2) ?(8 x^3 y^5)

Algebra 2
(7x-2)^1/4 = 5 7x - 2 = 625

Math
horizontal (x) component ... magnitude * cosine vertical (y) component ... magnitude * sine

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

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

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

Math
the difference is -7 the 5th term is 10 differences before the 15th term

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

science
impulse is the change in momentum over time

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

Math
horizontal means zero slope set f' equal to zero and solve for x

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

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

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

Chemistry
sounds like hydrogen peroxide

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

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

Physics
1/2 * 68.6 * (4.92^2 - 1.12^2)

maths
the whole circle is 2? ... or 20?/10 3?/10 - 20?/10 = ?

math
2L + 2W = 52 L = W + 4 substituting ... 2(W + 4) + 2W = 52 4W + 8 = 52

algebra 2
7C3 * 5C3

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

Science
an oxide ion will take on two electrons calcium has two valence electrons potassium has one valence electron

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

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

Math
correction ... 5/2 m = 2.25

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

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

physics
a = f / m = (16890 - 1010) / 1450

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

Algebra
the variable is to the 1st power so, yes

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

Science
maybe look at B?

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

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

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

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)

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

Spanish
hola ipap da loemlo

Math Homework
looks good

Math
.03 j = .05 s j = s + 500

Math
Will you marr... me

Math
x + y = 24 y + 12 = z x + y + 12 = 36 x + z = 36 (x + z) / 2 = 18

Physics
w = f * d Newtons * Meters = Joules

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

Physics
radius is half the diameter

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

math
60 seconds in a minute

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

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)

Algebra
s + a = 350 1s + 3a = 450 elimination looks pretty good

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

Physics
figure???

math
point-slope Y - y1 = m (X - x1)

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

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

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?

math
looks good

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...

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

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

math algebra
you have everything you need just crank the crank

math
2 = [1 + (p / 100)]^2 ?2 = 1 + (p / 100)

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...

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

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

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

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

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

physics
a = f / m kg and N means m/s^2

Physics
? may be 3º ... the wording is ???

Algebra 2
good chioce

math
the 54th term is 50 differences from the 4th term

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

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

Algebra 1 B
2 is good 3 needs work

physics
not sure about impossible... this is around escape velocity

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

algebra
n = 1000 * e^(.11 * 2)

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

geometry
looks like the line segment was doubled scale factor is two

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?

Chemistry
conservation of mass

Math
15.85 + .75 = 3n + 2(3.95) + 1.23

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

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

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

6 grade math area perimeter
area looks good perimeter might be 16 ... check it

6 grade math area perimeter
looks good

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

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

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

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

Algebra
s + L = 40 s + 6 = L subtracting the equations ... eliminating s L - 6 = 40 - L

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]

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

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

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