jbriggs444's latest activity
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The God of thunder, crossed the skies, upon his favourite filly. "I'm Thor", he cried, and the horse replied, "You've thorgotten the... -
jbriggs444 replied to the thread Collection of Lame Jokes.Why did the astronomer put meat in his shower?
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jbriggs444 replied to the thread I 1:1 versus 2:1 Mechanical Advantage debate.Are we arguing about the definition of "mechanical advantage" or are we nattering about a choice of reference frame and where to draw...
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jbriggs444 reacted to A.T.'s post in the thread I 1:1 versus 2:1 Mechanical Advantage debate with
Like.
The steps are irrelevant to the mechanical advantage. You can replace the human with a motor that continuously pulls itself up by... -
Yes, I think we all read it that way. @jbriggs444's point is that we have no info re the surface area of the reservoir, other than that...
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jbriggs444 reacted to jedishrfu's post in the thread I 1:1 versus 2:1 Mechanical Advantage debate with Like.
Your self-haul with a single fixed pulley has a 2:1 MA in the ideal case: half the force, twice the rope. The confusion clears the...
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Just remove the question from "defense contractors" and think about it for any job in engineering. The engineering challenges at, say...
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jbriggs444 replied to the thread Physics Problem on Tension in Water.The author has not given us the radius of the basin at the bottom. This is a hint that the radius is large enough to be irrelevant. From...
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jbriggs444 replied to the thread Collection of Lame Jokes.Looked it up. Work of a homeless guy in Austin by the name of "David". He specializes in weird signs like this.
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Very nice explanation! I think it gets to the heart of the matter. By choosing the tangential force appropriately as a function of...
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jbriggs444 replied to the thread Tension in a string connecting two blocks having equal and opposite velocities.You will need to be more specific about this. Are you suggesting that the midpoint of the string is pinned to the table? So that the...
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jbriggs444 reacted to Steve4Physics's post in the thread Tension in a string connecting two blocks having equal and opposite velocities with
Agree.
The centre of mass is some point on the string. At this point, 2 forces act: - tension: 120 N towards the 3 kg mass; - tension: 120 N... -
jbriggs444 reacted to Gavran's post in the thread Tension in a string connecting two blocks having equal and opposite velocities with
Skeptical.
The force of tension provides the centripetal acceleration to the centre of mass. -
jbriggs444 reacted to Steve4Physics's post in the thread Tension in a string connecting two blocks having equal and opposite velocities with Like.
Yes. The system described consists of 2 masses connected by a string with no net external forces. So the CM has a constant velocity of...
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