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amandela's latest activity
amandela
reacted to
Orodruin's post
in the thread
Instantaneous Acceleration Given Equation for Velocity
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Lower level textbooks often introduce dimensionless quantities such as ”velocity ##v## m/s or simply do not use units at all.
Mar 18, 2024
amandela
reacted to
.Scott's post
in the thread
Rolling Motion (Stone Gets Stuck in a Tire Going Forward)
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You are probably thinking of its motion relative to the car. The part of the tire that is in contact with the road is traveling...
Mar 18, 2024
amandela
posted the thread
Rolling Motion (Stone Gets Stuck in a Tire Going Forward)
in
Introductory Physics Homework Help
.
So I thought the stone would initially experience acceleration in the backward (leftward) direction then continually accelerate in the...
Mar 18, 2024
amandela
replied to the thread
Elastic Potential Energy - Positive or Negative?
.
OK. Thank you.
Mar 3, 2024
amandela
reacted to
haruspex's post
in the thread
Elastic Potential Energy - Positive or Negative?
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N? Btw, I'd prefer it said "relaxed" position, not equilibrium position. If there is a weight hanging from it they are different.
Mar 3, 2024
amandela
reacted to
vela's post
in the thread
Elastic Potential Energy - Positive or Negative?
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In the formula, $$\Delta PE = -\int_{x_0}^x F_{\rm s}(x)\,dx,$$ the force ##F_{\rm s}## is the force exerted by the spring. If you...
Mar 3, 2024
amandela
replied to the thread
Elastic Potential Energy - Positive or Negative?
.
So the Fs is negative (b/c moving back to 0) and I take the negative integral of the negative function?
Mar 3, 2024
amandela
posted the thread
Elastic Potential Energy - Positive or Negative?
in
Introductory Physics Homework Help
.
So I understand that I have to integrate the negative of the force function to get the change in PE. I get -(20x^2 - 2x^3) and when I...
Mar 3, 2024
amandela
reacted to
PeroK's post
in the thread
Work Done and Acceleration (Mistaken Answers?)
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There seems to be a growing problem with dodgy questions and/or dodgy answers. That someone teaching physics might think the...
Mar 3, 2024
amandela
reacted to
PeroK's post
in the thread
Work Done and Acceleration (Mistaken Answers?)
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It says at constant speed.
Mar 3, 2024
amandela
reacted to
haruspex's post
in the thread
Work Done and Acceleration (Mistaken Answers?)
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Like
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Agreed, except that if the weight is lifted from rest at speed h/t then it reaches h with KE ##\frac 12mh^2/t^2##.
Mar 3, 2024
amandela
replied to the thread
Work Done and Acceleration (Mistaken Answers?)
.
Thank you. They're from a test bank for the AP mechanics exam.
Mar 3, 2024
amandela
reacted to
PeroK's post
in the thread
Work Done and Acceleration (Mistaken Answers?)
with
Like
.
You are correct in both cases. Where are you getting the other answers from?
Mar 3, 2024
amandela
posted the thread
Work Done and Acceleration (Mistaken Answers?)
in
Introductory Physics Homework Help
.
So for Q1, I answered down (towards Earth) but the solution says there is no acceleration there. For Q2, I answered mgh, but the...
Mar 3, 2024
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