All Questions
Tagged with everyday-life biophysics
52
questions
2
votes
2
answers
178
views
Newtonian Physics vs Metabolic Equivilant (MET) calculations
I am trying to help my daughter do her physics homework. Her assignment includes calculating Calories worked off while exercising.
The formula she is using is ...
- 131
3
votes
2
answers
475
views
Human body as a measuring instrument
One can easily find descriptions of human eyes and ears used for measuring phenomenons. Finding what resolution do eyes have or what frequencies can human hear is no trouble. It is also seen in scales ...
- 59
0
votes
1
answer
2k
views
The physics behind the Judo "hip throw"
Recently, I saw my friend, the Judo captain, easily defeated his much larger opponent with the famous "hip throw" as shown here. Upon researching, I found out that this throw can allow a weaker ...
- 3,745
67
votes
15
answers
22k
views
Why is ascending some stairs more exhausting than descending?
I have been asked this question by school kids, colleagues and family (usually less formally):
When ascending a flight of stairs, you exchange mechanical work to attain potential Energy ($W_\text{...
- 831
1
vote
1
answer
3k
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experiencing vibration when in contact with my desk computer and a rubbing a friend's arm [closed]
I was with a friend sitting next to my desk computer, I put my hand on the computer and the other one on my friend who is in contact with the floor. The thing is that when I rub my hand on his arm we ...
- 41
1
vote
0
answers
48
views
Do prescription glasses augment or mitigate the effect of the sun on the skin around the eyes directly beneath them (assuming no UV blocking coating)?
The question is about minus correction (nearsightedness), but would also be interesting to know how it differs for plus correction (farsightedness), cylinder correction (astigmatism), axis correction.
- 39
1
vote
0
answers
58
views
How much heat do we lose perspirating?
How can I calculate the heat my body loses from perspirating? For example, X Jouls per liter of sweat.
- 151
0
votes
4
answers
6k
views
How can we feel temperature?
Recently I watched a Youtube Video by
Veritasium
He said we are actually feeling the rate of heat transfer, not the temperature.
But how do we feel temperature?
How is temperature different from ...
2
votes
3
answers
1k
views
Why are ski jumpers slim?
Assuming perfect technique and material, how does the mass of a ski jumper affect the performance?
The higher potential energy of heavier jumpers could favour heavier jumpers, but then also friction ...
- 4,292
19
votes
5
answers
7k
views
How is it possible for other animals to have better night vision than humans, who can detect individual photons?
According to the Wikipedia article on night vision,
Many animals have better night vision than humans do, the result of one or more differences in the morphology and anatomy of their eyes. These ...
- 48.4k
0
votes
1
answer
334
views
Are noise cancelling headsets safe? [closed]
Older microlight headsets such as the Lynx Micro System are modelled on ear defenders and physically attenuate the noisy cockpit environment by clamping hard onto your noggin. Most modern GA headsets (...
- 119
0
votes
0
answers
264
views
What are the possible dangers of removing the microwave shielding?
Would removing the shielding from a domestic microwave door allow the microwaves to cause damage to a consumer grade video camera, and if so, what damage would it cause?
- 183
0
votes
1
answer
685
views
Electric discharge through my knuckle
In some particular days, it seems that my car is somehow at a different potential from the ground. When I get out my car and I wear my sneakers (that I think are better insulators than other kind of ...
- 1,764
4
votes
5
answers
2k
views
Why is it so much easier to fall when walking down a slope?
When I walk uphill on an icey road, I almost never slip/fall. But if I walk downhill or even on a relatively flat road, I slip/fall frequently.
What is the physics reason behind this, and are there ...
- 57
18
votes
3
answers
10k
views
Which requires more energy: walking 1 km or cycling 1 km at the same speed? [closed]
I feel more tired walking 1 km than cycling 1 km at the same speed. However when cycling I am moving the extra weight of the cycle along!
- 933