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SammyS's latest activity
SammyS
reacted to
Steve4Physics's post
in the thread
Launch service between two stations along a flowing river
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FWIW here’s another approach. Suppose a launch (call it X) leaves stage M at 12:00. At the same moment, a launch from N is arriving...
Apr 16, 2024
SammyS
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PeroK's post
in the thread
Tension in a Two-Crate System on a Frictionless Surface
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You ought to have a diagram of the scenario. There are two boxes, hence two objects with forces on them.
Apr 15, 2024
SammyS
reacted to
Steve4Physics's post
in the thread
Launch service between two stations along a flowing river
with
Like
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It may be worth noting that there is no need to find the speed of the water or the speed of the boats relative to the water. E.g. the...
Apr 15, 2024
SammyS
reacted to
phinds's post
in the thread
B
Part to Whole comparison
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Haha
.
Apr 14, 2024
SammyS
reacted to
docnet's post
in the thread
Integration problem using inscribed rectangles
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The correct inequality is $$\sum_{i=2}^N\cosh ^{-1}i>\int^N_1 \cosh ^{-1}x dx$$ because the Riemann sum uses the right endpoints of each...
Apr 13, 2024
SammyS
reacted to
Orodruin's post
in the thread
Use substitution to solve the definite integral
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Did you doubt it? 😛
Apr 13, 2024
SammyS
replied to the thread
Find the position vector of ##Q##
.
And ΔQOA is similar to each of those two.
Apr 13, 2024
SammyS
reacted to
anuttarasammyak's post
in the thread
Find the position vector of ##Q##
with
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Triangle OPC and QPB are similar with ratio 3.
Apr 13, 2024
SammyS
replied to the thread
Factorise a six-termed quadratic in ##a## and ##x##
.
You asked how to go from ##\displaystyle \quad (x+1)^2 a^2+(1-x)(x+1)a-x## to ##\displaystyle \quad ((x+1)a+1)((x+1)a-x)## You have...
Apr 12, 2024
SammyS
reacted to
pasmith's post
in the thread
Condition for coplanarity of two lines
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If \mathbf{x_0} + \lambda\mathbf{n_0} and \mathbf{x_!} + \mu\mathbf{n_1} lie in the same plane, then the normal to that plane must be...
Apr 11, 2024
SammyS
replied to the thread
Factorise a six-termed quadratic in ##a## and ##x##
.
This can also be factored as a quadratic in ##a## . Using your ##\displaystyle \text{Autodesk Sketchbook}^{\circledR} ## image we get...
Apr 11, 2024
SammyS
replied to the thread
Factorise a six-termed quadratic in ##a## and ##x##
.
Yes, it can be factored by grouping. Notice that ##\displaystyle \ 2a^2-1 = a^2 + (a^2-1) =a^2 + (a-1)(a+1) \ .## Group as follows...
Apr 10, 2024
SammyS
reacted to
Hill's post
in the thread
B
How to pick some numbers out of 13 integers, by a 4 digits code
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Hint: binary.
Apr 8, 2024
SammyS
reacted to
kuruman's post
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I
Expansion of 1/|x-x'| into Legendre Polynomials
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Do you understand the meaning of ##\Theta(x-x')##? It's not equal to both. It's equal to one or the other depending on which of ##x##...
Apr 8, 2024
SammyS
reacted to
Mark44's post
in the thread
Solve the problem that involves Binomial distribution and hypothesis test
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Because P(D = 2) (i.e., exactly 2 damp bags) is part (a), subpart (i). Subpart (ii) asks you to find P(D > 3).
Apr 8, 2024
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