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jbriggs444's latest activity
jbriggs444
replied to the thread
Find at what rate the orbit radius will grow
.
[emphasis mine] You know the formula for work, right? Force times perpendicular displacement, right? And for power? Force times...
Today, 1:37 PM
jbriggs444
replied to the thread
B
Pressure in fluid (liquid)
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The mental picture I have is of a spoon pressing down into the water without submerging. Like a tiny boat that is forced a bit into the...
Yesterday, 5:45 PM
jbriggs444
reacted to
Ibix's post
in the thread
Variation of escape velocity with equal surface gravity
with
Like
.
I agree - I don't think the question is consistent. If the surface gravity is to be the same and the mass is less, the radius must also...
Yesterday, 4:15 PM
jbriggs444
reacted to
pbuk's post
in the thread
Two tourists and a bicycle - uniform motion
with
Like
.
Think about distance instead of time.
Yesterday, 9:12 AM
jbriggs444
reacted to
Ibix's post
in the thread
Projectile Motion Problem Involving Initial Velocity and Gravity Only
with
Like
.
Is there any information that you haven't used? And is there an assumption you've made to avoid using it?
Sunday, 5:46 PM
jbriggs444
replied to the thread
I
Handshake paradox involving the Starship Enterprise
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We disagree about three things. We disagree about length (length contraction). We disagree about duration (time dilation). We also...
Sunday, 12:18 PM
jbriggs444
reacted to
Orodruin's post
in the thread
Does a bug hitting your windshield slow down your truck?
with
Like
.
This is somewhat misleading. Collisions with bugs or raindrops will typically not be elastic so mechanical energy will not be conserved...
Friday, 1:42 PM
jbriggs444
reacted to
berkeman's post
in the thread
I
Looking for a formula for damage when sliding to a stop
with
Informative
.
BTW, one very important point to mention when talking about road rash is that it's especially important to protect joints that do not...
Thursday, 1:47 PM
jbriggs444
replied to the thread
B
Help understanding the Relativity of Simultaneity
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That is not a comparison between two clocks, exactly. Instead, it is a comparison between two coordinate systems -- observing the...
Thursday, 11:43 AM
jbriggs444
reacted to
Ibix's post
in the thread
B
Help understanding the Relativity of Simultaneity
with
Like
.
I suspect @Renato Iraldi is imagining looking at a stream of clocks moving past his location, ignoring all but the one right in front of...
Thursday, 9:44 AM
jbriggs444
replied to the thread
B
Help understanding the Relativity of Simultaneity
.
This statement seems overly strong. The sense in which the moving clocks run slower is relative to a chosen coordinate system. It is a...
Thursday, 9:37 AM
jbriggs444
replied to the thread
Angle that makes kinetic and potential energy of simple pendulum equal
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The snarky answer is: "Every angle that the pendulum achieves". Potential energy depends on an arbitrarily chosen reference. Choose the...
Thursday, 9:28 AM
jbriggs444
replied to the thread
I
Converting Longitude coordinates to feet (for separation)
.
With the range of latitudes in North Dakota, that leaves an uncertainty of about 800 feet plus or minus for the east/west distance...
Wednesday, 3:44 PM
jbriggs444
replied to the thread
Launch service between two stations along a flowing river
.
A simple counting argument suffices. If a boat moves from one end of the course to the other, it will necessarily encounter every other...
Apr 16, 2024
jbriggs444
reacted to
the farmer's post
in the thread
Relativistic motion and length contraction
with
Sad
.
You a right? It correct or i need to redo it again?
Apr 16, 2024
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