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karush
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Yesterday,
20:06
MarkFL
replied to a thread
Related Rates
in
Calculus
Yes, the length of his shadow is increasing at a rate of 4/3 ft/s, and the tip of his shadow is moving at a rate of 10/3 ft/s. :D
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8 replies  96 view(s)
Yesterday,
16:29
MarkFL
replied to a thread
Related Rates
in
Calculus
I got 4/3 ft/s where you got 3 ft/s. You have the line: \d{y}{t}=\frac{3}{2}\d{x}{t} Now, this implies: \d{x}{t}=\frac{2}{3}\d{y}{t}
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8 replies  96 view(s)
Yesterday,
16:20
MarkFL
replied to a thread
Compute The Limit
in
Challenge Questions and Puzzles
Nicely done, Chris! (Yes) This is the solution I found elsewhere: We are given to evaluate: \lim_{n\to\infty}\left(\sqrt{\int_0^1...
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4 replies  114 view(s)
Yesterday,
15:15
MarkFL
replied to a thread
Related Rates
in
Calculus
Suppose we wanted to work the problem in general terms. Please refer to the following diagram: $P$ is the height of the pole, $M$ is the...
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8 replies  96 view(s)
February 26th, 2017,
23:47
MarkFL
started a thread
Compute The Limit
in
Challenge Questions and Puzzles
Compute the following limit: \lim_{n\to\infty}\left(\sqrt{\int_0^1 \left(1+x^n\right)^n\,dx}\right)
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4 replies  114 view(s)
February 26th, 2017,
01:48
MarkFL
replied to a thread [SOLVED]
What type of mathematical function is this? Thanks :)
in
PreCalculus
We could likely model this with a function of the form (which comes from Newton's Law Of Cooling): f(t)=c_1e^{kt}+350 Since we know $f(0)=70$,...
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1 replies  77 view(s)
February 26th, 2017,
01:01
MarkFL
replied to a thread
trigonometric inequality challenge
in
Challenge Questions and Puzzles
My solution: Consider the objective function: F(A,B,C)=\sin(A)+\sin(B)+\sin(C)\cos(A)\cos(B)\cos(C) Subject to the constraint: ...
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3 replies  114 view(s)
February 25th, 2017,
23:35
MarkFL
replied to a thread
9.4.5 Identify the equilibrium values
in
Calculus
Let's look at the behavior of the solutions near the equilibrium solution $y=3$. Suppose we have: y(0)=2.9 Then we see: y'<0 And for:
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4 replies  78 view(s)
February 25th, 2017,
23:07
karush
replied to a thread
9.4.5 Identify the equilibrium values
in
Calculus
that was helpful l have more to do so hope it sinks in the next one is$\tiny{9.4. 7}$ $$y'=(y3)(y4)(y5)$$ identify the equilibrium values...
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4 replies  78 view(s)
February 24th, 2017,
16:49
karush
started a thread
9.4.5 Identify the equilibrium values
in
Calculus
$\tiny{9.4.5}$ $$y'=\sqrt{5},y>0$$ Identify the equilibrium values which are stable and unstable? I assume 0 is the only one
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4 replies  78 view(s)
February 24th, 2017,
11:34
MarkFL
replied to a thread
Hi  Passionate educator looking to help
in
Introductions
Hello and welcome to MHB, Jesse! (Wave) I removed the link to your email address, as that shouldn't be public, and people can just as easily...
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3 replies  94 view(s)
February 24th, 2017,
11:28
MarkFL
replied to a thread
Linear Algebra Conditions
in
Linear and Abstract Algebra
There's no need to link to the commercial site you used. Thanks! :D
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3 replies  99 view(s)
February 24th, 2017,
00:26
MarkFL
replied to a thread
Sequence question
in
PreAlgebra and Algebra
Let's find the $p$th term. I think what I would do is set: \frac{n(n+1)}{2}=p Now solve for $n$... n(n+1)=2p
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1 replies  58 view(s)
February 23rd, 2017,
23:23
karush
replied to a thread [SOLVED]
A tank contains 200 gal of fresh water
in
Differential Equations
again my great thanks. ill probably just try another similiar problem. really appreciate all the steps you showed. ☕
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7 replies  125 view(s)
February 23rd, 2017,
22:15
MarkFL
replied to a thread
Physics 1D Kinematics
in
Other Advanced Topics
Perhaps you meant how can we derive this formula. Let's begin with the definition of average acceleration: \overline{a}=\frac{\Delta v}{\Delta...
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6 replies  103 view(s)
February 23rd, 2017,
20:43
MarkFL
replied to a thread [SOLVED]
A tank contains 200 gal of fresh water
in
Differential Equations
I made a mistake in my above post...the IVP should be: \displaystyle \d{F}{t}=2\frac{5F}{4(50t)} where $F(0)=0$. So, this leads to: ...
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7 replies  125 view(s)
February 23rd, 2017,
18:09
karush
replied to a thread [SOLVED]
A tank contains 200 gal of fresh water
in
Differential Equations
$\displaystyle \frac{d}{dt}\left(\left(4(50t)\right)^{\frac{1}{4}}F\right)=2\left(4(50t)\right)^{\frac{1}{4}}$ integrate both sides...
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7 replies  125 view(s)
February 23rd, 2017,
16:33
MarkFL
replied to a thread [SOLVED]
A tank contains 200 gal of fresh water
in
Differential Equations
I would let $F(t)$ be the amount of fertilizer in the tank at time $t$. From the problem statement, we get the following IVP: ...
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7 replies  125 view(s)
February 23rd, 2017,
16:14
karush
replied to a thread [SOLVED]
A tank contains 200 gal of fresh water
in
Differential Equations
do you mean like this \begin{align*}\displaystyle \int_a^b dX&= \int_a^b \frac{3t 150}{50 t} \, dt \\ x&=\left_a^b \end{align*} looks...
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7 replies  125 view(s)
February 23rd, 2017,
14:31
MarkFL
replied to a thread
Physics 1D Kinematics
in
Other Advanced Topics
I don't follow...it's already in the form we want to give us the acceleration. :D
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6 replies  103 view(s)
February 23rd, 2017,
14:28
MarkFL
replied to a thread
Physics 1D Kinematics
in
Other Advanced Topics
The kinematic formula you want is: \overline{a}=\frac{v_f^2v_i^2}{2\Delta x}
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6 replies  103 view(s)
February 23rd, 2017,
13:26
karush
replied to a thread [SOLVED]
A tank contains 200 gal of fresh water
in
Differential Equations
this very mymathlab problem was also posted on mhf but was ??? and its due today ... but having got all the preveous problems right got very...
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7 replies  125 view(s)
February 23rd, 2017,
13:19
karush
started a thread [SOLVED]
A tank contains 200 gal of fresh water
in
Differential Equations
$\tiny{9.3.15}$ A tank contains 200 gal of fresh water. A solution containing 2 lb/gal of soluble lawn fertilizer runs into the tank at the rate of...
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7 replies  125 view(s)
February 23rd, 2017,
02:40
MarkFL
replied to a thread
New User Interface For Embedding Desmos Graphing Calculators In Your Posts
in
Announcements
Our goal is to make MHB stand out as much as we can from our competitors by offering features you just don't see anywhere else. If we were to package...
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3 replies  128 view(s)
February 23rd, 2017,
02:35
MarkFL
replied to a thread
Tapatalk...
in
Chat Room
Personally, I don't think Tapatalk is ready for vBulletin, much less sites using $\LaTeX$. From what I've gathered, many vBulletin admins refuse to...
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4 replies  94 view(s)
February 23rd, 2017,
01:29
MarkFL
replied to a thread
Tapatalk...
in
Chat Room
I'd be happy if Tapatalk didn't lazily bypass most vBulletin PHP plugin hooks. (Giggle)
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4 replies  94 view(s)
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November 24, 1944 (72)
About karush
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Wahiawa, Hawaii
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retired from Architecture and Surveying
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February 26th, 2017
02:20 
karush
clicked Thanks for this post:
Re: 9.4.5 Identify the equilibrium values
by
MarkFL
Let's look at the...
February 25th, 2017
22:50 
karush
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Re: 9.4.5 Identify the equilibrium values
by
HallsofIvy
Why would you "assume"...
February 23rd, 2017
23:49 
MarkFL
clicked Thanks for this post:
Re: A tank contains 200 gal of fresh water
by
karush
again my great thanks....
23:19 
karush
clicked Thanks for this post:
Re: A tank contains 200 gal of fresh water
by
MarkFL
I made a mistake in my...
16:39 
karush
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Re: A tank contains 200 gal of fresh water
by
MarkFL
I would let $F(t)$ be...
15:43 
karush
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Re: A tank contains 200 gal of fresh water
by
HallsofIvy
$\tiny{9.3.15}$ A tank...
February 21st, 2017
13:41 
karush
clicked Thanks for this post:
Re: 9.1.14 Use Euler's method to calculate
by
MarkFL
Given: ...
February 18th, 2017
16:37 
karush
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Re: 231.14.88 3d surface
by
HallsofIvy
Strictly speaking, it is...
04:21 
MarkFL
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Re: 231.14.88 3d surface
by
karush
thank you that was very...
03:46 
karush
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Re: 231.14.88 3d surface
by
MarkFL
Multiplying through by...
February 14th, 2017
23:14 
greg1313
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Re: 242t.8.5.9 expand the quotient by partial fractions
by
karush
here is what I did but...
18:27 
topsquark
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Re: 242t.8.5.9 expand the quotient by partial fractions
by
karush
here is what I did but...
17:07 
MarkFL
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Re: 242t.8.5.9 expand the quotient by partial fractions
by
karush
here is what I did but...
17:02 
karush
clicked Thanks for this post:
Re: 242t.8.5.9 expand the quotient by partial fractions
by
topsquark
$\tiny{242t.8.5.9}$ ...
February 10th, 2017
11:32 
karush
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Re: 8.3.8 int sin^5 (3x) dx
by
Prove It
$\tiny{8.3.8}$...
February 8th, 2017
20:02 
MarkFL
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Re: 242t.08.02.09 int of rational expression.
by
karush
thanks love the tips...
18:23 
karush
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Re: 242t.08.02.09 int of rational expression.
by
Prove It
$\tiny{242t.08.02.09}$...
18:23 
karush
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Re: 242t.08.02.09 int of rational expression.
by
MarkFL
While there's...
February 6th, 2017
18:28 
karush
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Re: 242.7x.27 Find the slowest growing and the fastest growing functions
by
HallsofIvy
$\displaystyle...
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