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March 27, 2017

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Posts by Scott

Total # Posts: 1,998

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

Chemistry
don't know if sulfuric is moral or not ... however, it is diprotic (two H+) ?M = .16 * 25/17 * 1/2
March 3, 2017

CIS
1. you have 1GB and want to have 4 GB ... 2 open slots means a 1 GB and a 2GB module 2. 4 slots with 2GB each means max memory of 8GB
March 3, 2017

Physic
(a) w = m g (b) equal to weight (c) f = m a = 500 * 2.5 (d) moving (kinetic) (e) k = (7000 - 1250) / (m g)
March 3, 2017

Physics
some strike... impulse = change in momentum i = .34 kg (31.3 m/s - -6.18 m/s)
March 3, 2017

Physics
missed part (a) (a) voltage = [?(11.4/29.5)] * total R
March 3, 2017

Physics
I^2 = W / ? = 11.4 / 29.5 calculate I the resistors add in series power = I^2 * total R
March 3, 2017

Math help plz?!!
looks like your calculator is set on radians try again with degrees nearest hundredth is two decimal places
March 3, 2017

Math! Help Hurry!
same y-coordinates a vertical line length is the difference of the x-coordinates
March 3, 2017

Maths
think you are correct the question says p.a. (per annum) 58.7 is all four years ... divide it by 4
March 3, 2017

maths trigonometry
cos ? + 1 = 0 ... cos ? = -1 ... ? = ? tan ? - 1 = 0 ... tan ? = 1 ... ? = ?/4 , 5?/4
March 3, 2017

Math(precalc)
the logs are just (messy) numbers that you can distribute, add, subtract... [4 log(4)] x - 3 log(4) = ... [9 log(3)] x - 6 log(3) grind away...
March 2, 2017

Algebra
seven three with one top three with 2 top one with three top
March 2, 2017

Physics
e = (wavelength / c) * h c = speed of light h = Planck's constant
March 2, 2017

math
a square has FOUR equal sides 4 * 1/3(x+2) = 4/3 x + 8/3 = P 4/3 x = P - 8/3 4 x = 3 P - 8 x = 3/4 P - 2
March 2, 2017

Biomechanics
so what is her vertical velocity after one second? you found the correct acceleration
March 2, 2017

Algebra, Math
.3 x + [.1 (500 - x)] = .25 * 500
March 2, 2017

math
(x + 5)^2 + (y - 2)^2 = 676 plug in the points to check if they lie on the circle
March 2, 2017

Science- Astronomy
venus is closer to the sun and has a shorter "year" earth has a moon but venus has none
March 2, 2017

science
because the moon is between the Earth and the Sun the sunlight reflected off the moon, that we normally see, is pointed away from us this is when solar eclipses can occur
March 1, 2017

Álgebra
2 * [(8 * 14) + (8 * 10) + (10 * 14)]
March 1, 2017

Math
5C3 = 10
March 1, 2017

Math
inverse ... y gets smaller as x gets bigger x y = 10
March 1, 2017

physics
the KE of the bullet e = 1/2 * .02 kg * (150 m/s)^2 answer is in Joules
March 1, 2017

SAT Math
4/3
March 1, 2017

Chemistry
these values are negative logarithms of the concentrations so a bigger number means a lower concentration
February 28, 2017

Science
work = f * d = 60 * 2 = 120 J power = work / time = 120 / 10 = 12 W work is in Joules and power is in Watts
February 28, 2017

homework
36 m times 4 lengths per day times 7 days per week times 4 weeks
February 28, 2017

Science
the mass (in kg) multiplied by the gravitational acceleration (in m/s^2) gives the weight in N (Newtons) w = .0585 kg * 9.8 m/s^2 w = .04593 kg * 9.8 m/s^2 the g value is 2 sig fig, so that is what the answer will have
February 28, 2017

Chemistry
Thanks
February 28, 2017

Chemistry
Tooth enamel consist mainly of hydroxyapatite (Ca5(PO4)3(OH). When tine (II) Flouride is added to toothpaste it reacts with the enamel to product a more decay-resistant material fluorapatite (Ca(PO4)3F. The by-products of this reaction are tin (II) oxide and water. What mass ...
February 28, 2017

Math
adding the equations ... to eliminate y 3x = 3 solve for x, then substitute back to find y
February 27, 2017

Calculus
h = highway distance from intersection d = auto-to-farmhouse distance by Pythagoras ... d^2 = h^2 + 6^2 differentiating implicitly ... 2 d dd/dt = 2 h dh/dt dd/dt = h / d * dh/dt
February 27, 2017

Science
barium carbonate in the same family as calcium carbonate (chalk)
February 27, 2017

pre calculus
(a) time up = time down ... = 320 fps / 32 ft/s^2 (b) the velocity at a given height is the same upward and downward EXCEPT for the direction the max height is 1600 ft, which is reached in 10 sec ... the velocity is zero at this point 1584 ft is one sec below the max ... 9s &...
February 27, 2017

Physics
the time to fall is ... t = ?(2 * 54 / g) speed off cliff = 130 m / t
February 27, 2017

Pre-Algebra
4/3 * ? * r^3 = ? * r^2 * 3 4/3 * r = 3
February 27, 2017

Algebra1
-8 * 6^2
February 27, 2017

Algebra1
100,350,000 * (1 + .017)^15
February 27, 2017

Science
t = 8.9 / 4.57 stopping distance = (8.9 / 2) * t
February 27, 2017

Physics
t = d / r across ... t = d / 2 back ... t = d / 8 total time ... d/2 + d/8 = 5d/8 total distance ... d + d = 2d average speed ... 2d / (5d/8) = 16d / 5d
February 27, 2017

Math
50h + 25(3h) + 10(12h) + 5(12h + 2) = 925 50h + 75h + 120h + 60h + 10 = 925 305h = 915
February 27, 2017

Chemistry
Silicon Carbide, SiC, is prepared by heating silicon dioxide in the presence of graphite. Carbon dioxide is the by-product of the reaction. How many grams of silicon carbide can be formed from the reaction of 50.0 grams fo graphite with 50.0 grams of silicon dioxide?
February 27, 2017

Chemistry
A scientist studying the reaction between decaborane (B10H18) and oxygen mixed 1.00 x 10^2 grams of decaborane with 2.75 x 10^2 grams of oxygen. Compute the masses of all substance present after the reaction went ot completion, generating B2O2 and water as the only products.
February 27, 2017

Math
you've got x and y switched ... and the rate of ascent is the slope the right equation will give the right answer
February 27, 2017

Math
1st one is correct the division hint is for the 2nd
February 27, 2017

Math
one out of two if something goes into something else "evenly" (wholly), then ...
February 27, 2017

math
dh/dt is the velocity (1st derivative) v(t) = -32t
February 27, 2017

physics
hydraulics? the force multiple is the ratio of the piston areas f * (180 / 2)^2 = 2400 * g
February 27, 2017

Physics
the density of air decreases with altitude the balloon stops rising because the density of the gas inside is close to the ambient air density the weight of the balloon itself also contributes to the loss of bouyancy
February 27, 2017

ADVANCED LEVEL PHYSICS
after 4 s, the velocity is 4*a after 5 s, the velocity is 5*a the average velocity in the 5th sec is ... (5a + 4a) / 2 = 4.5a 4.5a = 36 ... a = 8 m/s^2
February 26, 2017

Algebra
w + j > 18 w/3 + j/6 < 5 ... 2w + j < 30 walk 1 hr, jog 3 hr
February 26, 2017

Math
no 27 + 33 = 60 they will end up with two lengths of fence with no space in between
February 26, 2017

word problem
(49 - 9) / 4 = (85 - 9) / 4 =
February 26, 2017

Math
2 sin^2 - sin - 1 = 0 (2 sin + 1)(sin - 1) = 0 2 sin + 1 = 0 ... sin = -1/2 sin - 1 = 0 ... sin = 1
February 26, 2017

Math
80 cubes long 8 cubes wide 13 cubes high
February 26, 2017

maths
n^2 + 1/n^2 = 7 n^4 + 1 = 7 n^2 ... n^4 - 7 n^2 + 1 = 0 let k = n^2 k^2 - 7k + 1 = 0 use quadratic formula to find k n = ?k
February 26, 2017

Maths
z = 7/9 c
February 25, 2017

math
the east component is ... 10 cos(30º) the north component is ... 10 sin(30º) - 4 speed = ?[(east)^2 + (north)^2] tan(?) = north / east ? is degrees north of east
February 25, 2017

chemistry
the molar mass of Fe is 55.8 g [98.7 / (2 * 55.8)] * 852 kJ
February 25, 2017

physics
the ball is pulled back from the lowest point, and gains gravitational potential energy this energy becomes kinetic energy when the ball is released ... it is maximum at the low point m g h = 1/2 m v^2 ... v = ?(2 g h) use trig to find the height above the low point
February 25, 2017

Algebra
9 / .75 = x / 7.5
February 25, 2017

College Algebra
(x * .05) + [(10000 - x) * .06] = 550
February 25, 2017

Chemistry
hydrogen and hydroxide ions are neutralizing each other acid vol * molarity * hydrogens = ... base vol * molarity * hydroxides 26.3 * x * 2 = 17.45 * .425 * 1
February 25, 2017

math
p log(8.2) = q log(10.5) p / q = log(10.5) / log(8.2)
February 25, 2017

Math :(:( Totally stressing ouuut ned help now.
translation moves the object, but it maintains its orientation reflection or rotation can result in the point being up
February 25, 2017

math help now plez
type the url (web address) for the figure
February 25, 2017

High School Geometry
this is a 30-60-90 triangle m?L = 30 ° ... AK is the side opposite AL (the hypotenuse) is twice AK KL is AK times ?3 the area is 1/2 the product of the two perpendicular sides
February 25, 2017

Math
9 m x 6 m = 54 m^2 4 m x 4 m = 16 m^2
February 24, 2017

Biomechanics
1.5 laps is 600 m 600 m / 77 s = 7.8 m/s it's a straight forward calculation typo somewhere?
February 24, 2017

stats
the dice are independent chance (probability) of a 5 is ... 1/6
February 24, 2017

physics help please
the difference in the path length between the direct and reflected sound should be an odd half wavelength to facilitate cancellation ... 1/2, 3/2, 5/2... the speed of sound is 340 m/s so the wavelength is 340/440 m the diagram is an isosceles triangle with an altitude of 2 m...
February 24, 2017

math need help now
as bob says "all REGULAR n-gons are similar" C for sure (they're regular) D doesn't say "regular"
February 24, 2017

math
you're looking for an area of 80 try C
February 24, 2017

Physics
vol = m / d = 20 kg / 20Mg/m^3 = 1 L the stone displaces 1 L of water with a mass of 1 kg the stone's weight is ... 19 * g
February 23, 2017

math
pay = [$.01 * 2^(day)] - $.01
February 23, 2017

Physics
did your G have the right units? you are correct that either equation should work Fg = Fc ... in orbit ... recalculate, and watch your units
February 22, 2017

Science
blood comes from the body ... goes to the lungs ... comes back from the lungs ... goes back out to the body the blood drops off carbon dioxide and water in the lungs and picks up oxygen, which is carried out to the body look up the exact flow through the heart chambers ...
February 22, 2017

physics
the surface is frictionless, so T is providing acceleration to the boxes the accelerating force is transferred to the small box by friction between the boxes at some point (as T increases), the frictional force will not be enough to provide the necessary acceleration and the ...
February 22, 2017

chemistry
.100 L * .10 M/L = .010 M .010 M / 4.0 M/L = ?
February 21, 2017

chemistry
each mole of butane yields 5 moles of water a mole of gas at stp is 22.4 L 10/22.4 * 5
February 21, 2017

probability
this is a binomial result ... win or not win P(w) = .15 , P(n) = .85 (n + w)^10 ... you want the 3rd term 10C2 * .85^8 * .15^2
February 21, 2017

Physics
the acceleration is ... g sin(38.0º) d = 1/2 a t^2 ... t = ?(2d / a)
February 21, 2017

Chem
you need to combine the given reactions ... some partial and/or reversed ... to get the desired reaction 2CO2 + H2O --> C2H2 + 5/2 02 ?H = 1300 kJ 2C + 2O2 --> 2CO2 ?H = -788 kJ H2 + 1/2 O2 --> H20 ?H = -286 kJ add the 3 reactions, along with the ?H's ... cancel ...
February 21, 2017

Math
1 cm on the original is 20 cm on the transfer
February 21, 2017

chemistry
not enough nitrogen a mole of nitrogen is needed for every 3 moles of hydrogen
February 20, 2017

math
tan(?) = 250/170
February 20, 2017

Math
v = 24 (1 + .06)^385
February 20, 2017

physics
2 * vertical velocity / g 16.7 * ?2 / 9.81
February 20, 2017

Algebra
(a) m = 500 (1 + .015)^t (b) 800 = 500 (1 + .015)^t ... 1.6 = 1.015^t ... log(1.6) = t log(1.015) ... [log(1.6)] / [log(1.015)] = t
February 20, 2017

Algebra - PLEASE HELP!
231 = -17.5x2^ - 138.5x - 27 462 = -37 x^2 - 277 x - 54 0 = -37 x^2 - 277 x - 516 use quadratic formula to find x
February 20, 2017

probability
there are 9 pairs of cards that differ by one ... 1-2, 2-3, 3-4, etc. there are 10C2 possible pairs ... 45 so the probability of a pair differing by one is 9/45 or .2 ... by more than one is (1 - .2) = .8 3 cards contain 3 pairs .8^3 = .512
February 19, 2017

physics
m g h = 1/2 m v^2 ... v = ?(2 g h)
February 19, 2017

physics
it's a fraction of a mole ... 9.1E5 / 6.02E23 multiply the fraction by the molar mass
February 19, 2017

physics
60 sec in a min 2.54 cm in an inch 9.843E4 ft/min * (1 min / 60 s) * ... (12 in / 1 ft) * (.0254 m / 1 in)
February 19, 2017

physics
f = m a = 2E3 kg * ... [(20 m/s - 5 m/s) / 4 s] answer is in Newtons
February 19, 2017

Algebra2
an = 13n - 8
February 19, 2017

Physics
convert mph to m/s convert cg(?) to kg K.E. = 1/2 m v^2
February 19, 2017

physical science
Joules of energy required ... 202 * (95.6 - 22.0) * 4.18 divide by heater wattage ... 1 watt = 1 Joule per second divide by 60 ... sec to min
February 19, 2017

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