All Questions
8
questions
8
votes
1
answer
882
views
Why doesn't a blunt-tip nail crack the wood?
I came across this video, which shows you how to prevent the wood from cracking up at the ends while hammering a nail into it. The proposed solution is to make the nail tip blunt using a plier. This ...
- 12.5k
0
votes
1
answer
564
views
What is causing the doors to move? [duplicate]
New to physics SE (physics too). Today I Observed a strange thing. In my house there are a pair of doors attached to same wall (the wall is about 30 cm wide), both are oppositely hinged (note: we need ...
- 172
25
votes
6
answers
6k
views
Why does low tire pressure reduce fuel efficiency?
I've always thought that it was because the frictional force on the tire was increased due to the bulging of the tires increasing the surface area in contact with the road. However, a colleague of ...
- 391
-3
votes
2
answers
72
views
How can the motion of the brain within the skull be stopped at the moment of impact? [closed]
How can the motion of the brain within the skull be stopped or controlled at the moment an object with velocity comes in contact with it. What type of a system would this require?
- 1,235
-2
votes
1
answer
4k
views
Physics/forces involved when separating two 5 gallon buckets
So a friend jokingly said "there's no force in the universe stronger than two 5 gallon buckets that are stick together." And I thought that this has to have a wonderfully complex and scientific ...
1
vote
2
answers
220
views
Thought Experiment: If you fell out of a plane at 36,000 ft (11km), would the additional air pressure from falling allow you to breathe?
Imagine you fell out of a plane at 36,000 ft (11km), roughly cruising altitude, with a parachute. If you deployed your parachute immediately, you would be stuck at high altitude with no oxygen, and ...
- 2,714
4
votes
1
answer
1k
views
Does the force on the bottom piece of a hummingbird feeder depend on the height of the water in the reservoir?
Intuitively I would think that the more nectar you put into the reservoir the more weight it will put on the bottom piece (the tray that holds the open pool of nectar that the birds can feed out of). ...
- 2,613
11
votes
2
answers
833
views
What if the lid of a pressure cooker was suddenly released?
My dad and I have tried to calculate the strength of the explosion if the lid was suddenly freed. We took some measures:
Lid mass: $0.7 \textrm{kg}$
Lid surface: $0.415 \textrm{m}^2$
Internal ...
- 211