Dale's latest activity
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Dale reacted to PeroK's post in the thread Undergrad Is this another "paradox" or a veritasium mistake? with
Like.
PS note that this scenario in itself is not peculiar to special relativity. In classical physics, a light beam could bend in an... -
Dale replied to the thread Undergrad Is this another "paradox" or a veritasium mistake?.In the inertial frame the light goes straight. The accelerating rocket’s path is a parabola in spacetime. So they see the laser hit...
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Dale reacted to DEvens's post in the thread Physics Career Prospects (outside of academia) with
Informative.
About physics in industry. I only know about the nuclear industry in Canada. There is some indications of new build in Canada. So it... -
Dale replied to the thread High School Why higher speeds need more power if the backward force is the same?.This is also why talking about biomechanics in energy discussions is usually not helpful. Life is messy.
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Dale reacted to A.T.'s post in the thread High School Why higher speeds need more power if the backward force is the same? with Like.
Just because you can have an inefficient system, that wastes energy on something, doesn't mean that energy is required to achieve that...
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Dale replied to the thread High School Why higher speeds need more power if the backward force is the same?.Yes, but sometimes there are shortcuts. In the case of running or walking up the stairs, neglecting the initial start and final stop...
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Dale reacted to kuruman's post in the thread High School How Does Constant Power Affect Rocket Acceleration in Space? with Like.
Yes, of course. I was thinking of something else. It's late where I am. Good night.
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Dale replied to the thread High School How Does Constant Power Affect Rocket Acceleration in Space?.The max velocity is not limited to any value less than ##c##. But ##v-u## would never be zero for a functioning engine. It would only be...
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Dale replied to the thread High School Why higher speeds need more power if the backward force is the same?.Then do more stairs for the experiment. None of this distraction you are bringing is likely to be helpful for the OP.
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Dale replied to the thread High School Why higher speeds need more power if the backward force is the same?.That is specifically why I didn't say easier or harder. I said which makes you sweat more. I.e. which heats you up faster.
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Dale reacted to jbriggs444's post in the thread High School How Does Constant Power Affect Rocket Acceleration in Space? with Like.
Oh dear. The conversation has apparently shifted away from the question of gear ratios to the matter of a failure to account for the...
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Dale reacted to wrobel's post in the thread High School Why higher speeds need more power if the backward force is the same? with Like.
I do not understand such questions. There is a definition: Power=##W=(\boldsymbol F,\boldsymbol v)##. There is a theorem: $$\dot...
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Dale reacted to PeroK's post in the thread High School How Does Constant Power Affect Rocket Acceleration in Space? with Like.
It's not wrong, but a rocket is a special case. See below. Everything accelerates at a constant rate for a constant application of...
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Dale replied to the thread High School Why higher speeds need more power if the backward force is the same?.Yes. Not on average, no.
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Dale replied to the thread High School Why higher speeds need more power if the backward force is the same?.Walk up some flights of stairs. Then the next time run up the same stairs. Which makes you more sweaty?