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sinx
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sinx
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Today,
04:48 PM
sinx
replied to a thread
Unsure how to proceed
in
Intermediate/Advanced Algebra
you have 2 equations and 2 unknowns. 0.108A+0.353B=382 0.402A+0.158B=566 where, A=units of product A and B=units of product B
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3 replies | 45 view(s)
Yesterday,
01:16 PM
sinx
replied to a thread
Mechanics help
in
Intermediate/Advanced Algebra
"modelled as that of a particle moving freely under gravity" means you ignore the drag on the particle by the air.
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2 replies | 74 view(s)
09-21-2018,
08:48 PM
sinx
replied to a thread
Calculate a side in a non-right angled trangle
in
Geometry and Trig
you know the sin, so you know an angle. you know there are 1800 in a triangle. and that two angles are equal. and you know 2 sides.
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5 replies | 119 view(s)
09-18-2018,
09:45 PM
sinx
replied to a thread
Question about circumference
in
Geometry and Trig
in a way it is. the length you describe will have the same measurement as the circumference.
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5 replies | 149 view(s)
09-18-2018,
09:36 PM
sinx
replied to a thread
Get distance from XY position unto the nearest point of a square
in
Geometry and Trig
distance=2+y2]1/2
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4 replies | 138 view(s)
09-13-2018,
09:03 PM
sinx
replied to a thread
Find the missing length in this shape
in
Geometry and Trig
pathagorean theorem?
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9 replies | 248 view(s)
09-11-2018,
05:14 PM
sinx
replied to a thread
How to measure this missing area? (replacing existing countertop)
in
Geometry and Trig
to figure the angle without protractor, use a framing square and find two sides of a rt triangle. Once you know two lengths, you can calculate the...
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5 replies | 126 view(s)
09-10-2018,
11:09 PM
sinx
started a thread
integral [from x to 0] (r^2 - x^2)^{1/2} dx : different units
in
Calculus
int(r2-x2)1/2dx, limits x=x, 0 (x is upper limit, 0 is lower limit) =int r(1-x2/r2)1/2dx sub x/r=sin& =r2int cos2&d&, limits &=sin-1(x/r), 0 ??...
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1 replies | 94 view(s)
09-08-2018,
10:53 PM
sinx
replied to a thread
Related Rates Problem featuring a Ferris Wheel
in
Calculus
you are right, rate of change of angle = pi radians/min. (2 revolutions in 2 min) and also, rate of change in arc length = radius*rate of change in...
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2 replies | 130 view(s)
09-07-2018,
02:35 PM
sinx
replied to a thread
Spherical Cup Volume: red portion is filled volume, V = (pi/3)*(h^2)*[3r-h]
in
Geometry and Trig
My mistake. I changed 'hemipsherical' to 'spherical' in my post. I know. What he needs is a 3-d integration of a partially filled cup. That is...
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17 replies | 645 view(s)
09-05-2018,
08:01 PM
sinx
replied to a thread
Spherical Cup Volume: red portion is filled volume, V = (pi/3)*(h^2)*[3r-h]
in
Geometry and Trig
the eqn gives volume of a spherical cap filled to depth d.
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17 replies | 645 view(s)
09-05-2018,
12:54 PM
sinx
replied to a thread
Spherical Cup Volume: red portion is filled volume, V = (pi/3)*(h^2)*[3r-h]
in
Geometry and Trig
yes, integration is required. the resulting eqn does satisfy 1/2 full and full. pls double check. cap is a hemisphere of radius r; d=depth of...
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17 replies | 645 view(s)
09-04-2018,
07:43 PM
sinx
replied to a thread
something is not right here: Simplify [(8 x^4 y^{-2})/(4 x^7)]^{-3}
in
Intermediate/Advanced Algebra
you multiply the top and bottom by the same number, always (you are multiplying the fraction by 1) 3/8/4, you multiply 8/8; =3/32
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12 replies | 343 view(s)
09-04-2018,
06:45 PM
sinx
replied to a thread
Spherical Cup Volume: red portion is filled volume, V = (pi/3)*(h^2)*[3r-h]
in
Geometry and Trig
for cap of spherical radius r, cap is 1/2 a sphere V=pi/6d2(3r-d); where d=depth of liquid for cylinder of length L and radius r, h is distance...
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17 replies | 645 view(s)
09-03-2018,
07:45 PM
sinx
replied to a thread
Spherical Cup Volume: red portion is filled volume, V = (pi/3)*(h^2)*[3r-h]
in
Geometry and Trig
given the spherical cup volume formula in terms of r, h; and assuming this is correct; to put the formula in terms of a,h, use r2=a2+h2 then for...
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17 replies | 645 view(s)
09-03-2018,
06:40 PM
sinx
replied to a thread
something is not right here: Simplify [(8 x^4 y^{-2})/(4 x^7)]^{-3}
in
Intermediate/Advanced Algebra
others have caught your mistake, i.e. 2-3=1/8 it is sometimes easier to get rid of negative exponents, e.g. (2/x3y2)-3 =(x3y2/2)3 = x9y6/8
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12 replies | 343 view(s)
09-03-2018,
06:13 PM
sinx
replied to a thread
Help creating equation for word prob: "Mike can plow field in 12 hrs; Phil in 15 hrs"
in
Beginning Algebra
it is not easy to see what to do, so draw a picture, (of a field, shading in the amt plowed by each person). then you can see one person plows 1/12...
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10 replies | 420 view(s)
09-02-2018,
05:54 PM
sinx
replied to a thread
Probability Word Question - Sheep, Ewes, Mature: A farmer has 100 sheep in a field...
in
Probability / Statistics
start with the question. How many sheep in the field are likely to be black, mature, rams? you know first you have 40 rams, (40% of 100). then...
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4 replies | 248 view(s)
09-02-2018,
05:20 PM
sinx
replied to a thread
Negative square root in system of equations? sqrt(x)+2*sqrt(y)=3, 2*sqrt(x)+sqrt(y)=0
in
Intermediate/Advanced Algebra
sq roots can be + or -. plug your possible solns back into the initial equations. you will see that -1 is the soln for sqrt x, (and y=4). what...
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6 replies | 273 view(s)
09-02-2018,
04:49 PM
sinx
replied to a thread
Finding Locus (PreCal): points three times as far from (0,4) as from (2, 0)
in
Intermediate/Advanced Algebra
I was trying help him picture the problem. where a line between the two given pts is the distance between them. then 3/4 the way down that line is...
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6 replies | 319 view(s)
09-02-2018,
03:34 PM
sinx
replied to a thread
Help! man stands on ground 12m away from building which is 16m high. (+4 other Q's)
in
Geometry and Trig
for all of these except no.2, draw a picture.
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5 replies | 257 view(s)
09-02-2018,
12:57 PM
sinx
replied to a thread
Finding Locus (PreCal): points three times as far from (0,4) as from (2, 0)
in
Intermediate/Advanced Algebra
I think it means you draw a line from (0,4) to (2,0) then one point you need is at 3/4 this distance.
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6 replies | 319 view(s)
08-30-2018,
08:18 PM
sinx
replied to a thread
Set Up: Find Weight from Magnitude of Friction on a Chain(Vectors)
in
Calculus
before answering your question Dr. Peterson; I will attempt to answer the original poster's question. the wt of the chain is the sum of the...
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7 replies | 317 view(s)
08-29-2018,
04:37 PM
sinx
replied to a thread
Set Up: Find Weight from Magnitude of Friction on a Chain(Vectors)
in
Calculus
the tension in the chain is 25N. component is 25sin37, and its horizontal is 25cos37.] however, the only direction the chain can transmit force is...
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7 replies | 317 view(s)
08-29-2018,
10:42 AM
sinx
replied to a thread
Set Up: Find Weight from Magnitude of Friction on a Chain(Vectors)
in
Calculus
draw a free body diagram. the tension is along the length of the chain. it is true that the wt pulls down, but you are analyzing the tension. That...
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7 replies | 317 view(s)
08-28-2018,
03:58 PM
sinx
replied to a thread
Find equation of normal line to y = x^1/2 that is parallel to y = 1 - 2x
in
Calculus
I believe you are thinking about it correctly. when you know the slope of the tangent, the normal line will be 900 to that, and is the negative...
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6 replies | 224 view(s)
08-27-2018,
07:20 PM
sinx
replied to a thread
d=rt Problem: A cattle train left Miami and traveled toward New York....
in
Beginning Algebra
did you understand how to get the distance? distance is same for both trains. you know the speed and time of the diesel train, so you can...
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4 replies | 266 view(s)
08-27-2018,
02:38 PM
sinx
replied to a thread
Quotient Rule problem: Differentiate f(x) = (x^2 + 4x + 6) /x^{1/2}
in
Calculus
good show, Dr Peterson. It occured to me that from here you could rewrite each term as a product, . i.e. x2(x-1/2 )+ 4x(x-1/2 ) + 6(x-1/2 )...
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6 replies | 334 view(s)
08-24-2018,
08:29 PM
sinx
replied to a thread
Can this be simplified? 1 / [3 * cube root of {x^2}]
in
Beginning Algebra
sqrtx=x1/2, cube rt x2=x2/3 you want a common denominator. so you need a common power of x, (and of course common number in front). i.e. change...
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15 replies | 626 view(s)
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