All Questions
6 questions
2
votes
1
answer
505
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In terms of compressive stress $F/A$, what is the cross-sectional area of a sphere?
Any physics textbook chapter on stress-strain curves will generally mention that stress is force acting upon an area, and when a shape is three-dimensional, that area is the cross-sectional area. ...
- 23
29
votes
6
answers
6k
views
Why do objects with big size break easily?
Why do objects with big size break easily? For example: if I drop a chalk of length $L$ from height $h$ then there is a greater probability that it might break, when compared it to a chalk of length $\...
- 1,691
1
vote
1
answer
491
views
Scale diagram confusion
I’m familiar with scale diagrams where three forces act upon an object and trigonometry is used to find the resultant force, but I’ve come across questions that use units of velocity instead of force. ...
- 1,831
1
vote
1
answer
63
views
Scaling of nuclear and electromagnetic force
The Wikipedia article on alpha decay stated:
The strength of the attractive nuclear force keeping a nucleus together is thus proportional to the number of nucleons, but the total disruptive ...
- 4,322
7
votes
2
answers
11k
views
How can an an ant lift 50 times its own weight and pull 30 times its weight?
According to many sites like this one, an ant can apparently lift 50 times its own weight and pull 30 times its weight. Is it true?
Can it be proved using physics? Though most sites agree that an ...
- 1,035
2
votes
6
answers
9k
views
Which person can handle falls from big heights better: lighter or heavier?
This probably includes a little of biology, but I believe it's mainly physics, so I hope it's ok to ask here:
Imagine 2 persons: Person A weights 120 pounds and person B weights 180 pounds.
Imagine ...
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