All Questions
Tagged with everyday-life biophysics
52
questions
0
votes
2
answers
601
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Stability on a bus
I ride the bus from home to school and vice versa approximately 3-4 times per week for an hour each time. The bus is either bi- or tri-articulated, and it can accelerate to speeds up to 80km/h.
Most ...
3
votes
1
answer
5k
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How does eating a cold ice cream actually heat up your body? [closed]
The question is the title itself. During winter one of my friend told we'll have an ice cream. And rest of us where like are you nuts. He was like cold ice-cream actually heats up your body.
Even I ...
- 842
3
votes
1
answer
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Raising a cut on your arm above your heart
I often read that when you have a deep cut on your arm, you should raise your arm to the point where the cut is above your heart. This should reduce the amount of blood loss because less blood reaches ...
- 2,943
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3
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20k
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How do Calories (kcal) relate to watts?
In thinking about exercise and "burning calories" it occurred to me that there should be some fairly intuitive correlation between the biological energy conversion going on in a person's body with the ...
- 119
1
vote
5
answers
18k
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Lifting and putting down a weight
A man in a gym lifts a weight and then puts it down where it was before.
What can be said about the work done by the man to the weight?
Can it be equal in absolute value to the work made by the ...
- 673
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3
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5k
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Why can you lift more weight with bad form?
Sorry for the lack of academia behind the subject of the question, however I'm trying to prove a friend wrong.
He says that bad form with a deadlift will not allow you do more weight and he's doing ...
1
vote
0
answers
95
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How does it takes to deadlift a sports car? [duplicate]
In the movie Furious 7, Dom lift a Lykan HyperSport with bare hands.
Given that in reality, how strong it has to be to lift a Lykan HyperSport(1,380 kg), says to 40 cm in one rear end, and hold it ...
- 111
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votes
1
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84
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Plausibility of the distance estimation in a cycle ergometer gym exercise
A friend of mine pedaled for an hour on a cycle ergometer, a stationary bicycle in a gym.
At the end of the ride the cycle computer reported a distance of $40\:\mathrm{km}$ and an average power of $...
0
votes
3
answers
315
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Work power and energy
When you push your bicycle up on an inclined the potential energy of the bicycle and yourself increases. Where does this energy come from?
user60881
8
votes
1
answer
14k
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Why do I hear a deep rumble when I cover my ears?
Probably a trivial thing but a simple google search didn't show anything relevant about it.
If I cover both of my ears with my hands, I hear a very deep rumble. If I slowly move my hands away the ...
- 8,150
1
vote
2
answers
474
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What's Optimal About Six Legs According to Physical Laws? [closed]
In many respects the insects can be regarded as the most successful class of animals in evolutionary terms. And one of the most common features of insects is that they (mostly) all have six legs.
Not ...
- 11.7k
2
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0
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257
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Is WiFi safe for humans? [closed]
I have WiFi on at my home almost all the time. I learned that the frequency of visible light is around several hundreds of THz, while the frequency of wifi is only several GHz, which is only 1:100,000....
- 139
23
votes
4
answers
108k
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How much energy in form of heat does a human body emit?
How much energy in form of heat does a human body emit at rest level?
- 343
2
votes
2
answers
977
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Order of magnitude estimation for some intriguing questions
The physics TA showed us a few examples in which one can estimate many things from first principles, sound logic, and scaling arguments. This led usually to understanding of why some numbers have the ...
- 17.1k
3
votes
2
answers
255
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"In-head" sound intensity with and without earplugs
When you bite something in two pieces, e.g. a piece of hard candy, you hear the sound through two sources: vibrations in the air, entering your ears from the outside and internal vibrations in your ...
- 2,905