russ_watters's latest activity
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Just to note that is the definition of tension. It's the force transmitted; not twice the force transmitted! -
russ_watters replied to the thread B Simple mass/scale puzzle.I mean the weight is 10kg, so where the cable attaches to the weight the upward force on the weight is 10kg.
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Suppose you eliminate the pulley on the left and tie the cable to a fixed block resting on the table top, as shown in the figure below...
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Since the weight is stationary (i.e., not accelerating), the tension pulling up on the weight must exactly balance the gravitational...
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russ_watters reacted to phinds's post in the thread B Time dilation for two clocks at different altitudes on Earth with
Like.
Good question, but the mass of the mountain is essentially zero compared to the mass of the earth, and the gravitational time dilation... -
russ_watters replied to the thread B Simple mass/scale puzzle.That's fine, but also: The rope can only have one tension. It can't be 10kg by each weight and 20 in the middle (a common error).
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My learning is a bit rusty. I can intuit the answer but I can't formalize it. What does the scale read? I say the scale reads 10kg...
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russ_watters reacted to Ibix's post in the thread I Topic about physics axioms, theory, laws etc.. with
Haha.
The late, great Sir Terry Pratchett hypothesised the existence of queons and kingons, particles that carry monarchy, and their... -
russ_watters reacted to Dale's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
EM waves can cause things. If there is a finite invariant speed then anything massless travels at that invariant speed. If there is an...
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russ_watters reacted to A.T.'s post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
If you want certainty, try religion.
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russ_watters reacted to jbriggs444's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
No. He did experiments. They were flawed. The results could not be reproduced. A quick trip to Google pulls up this article...
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russ_watters reacted to hutchphd's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
's I think Galileo gets the credit for this technique. Newton was born with a year of Galileo's death so he knew of the work I would...
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russ_watters reacted to Ibix's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
No. The point is that maths isn't generally about truth, it's about self-consistency. Physics needs self-consistent models, but they...
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russ_watters reacted to Dale's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
I think that he rolled balls down an incline. I don't know anything about this theory, but if it always gives correct results then what...
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russ_watters reacted to Dale's post in the thread I Topic about physics axioms, theory, laws etc.. with Like.
That was from experiment. Now, we consider those experiments so reliable that we have incorporated it into our definition of force...