Questions tagged [everyday-life]

Concerns the application of the laws of physics to analyze common situations encountered in everyday life.

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1answer
28 views

Bubbles on the surface of tea after using a teabag

What are those bubbles/lines on the surface of my (clean) teacup after making tea with a tea bag (seethrough paper kind, wrapped in paper)? I used a kettle. The water is clean. Also what determines ...
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8answers
524 views

Are there any quantum effects which we can see in every day life? [closed]

I am wondering if there are any natural phenomenon in every-day life that cannot be explained by classical physics but can only be explained by quantum mechanics. By classical physics, I mean ...
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0answers
78 views

Will a curtain tension rod support blackout curtains? [closed]

Please see picture below. My husband is renting condo. Grouchy landlord prohibited modifications like "few screw holes" or "drywall spackle". Husband wants "install a proper ...
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2answers
44 views

Trajectory of hitting stump by swinging the ball

If we want to hit a target by a stone or missile we have to consider and calculate the interaction of the surroundings with the thrown object precisely. Can you show a mathematical model or trajectory ...
34
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3answers
3k views

Why does glass, in spite of being amorphous, often break along very smooth surfaces?

When a crystalline material breaks, it often does so along planes in its crystalline structure. As such this is a result of its microscopic structure. When glass breaks however, the shapes along which ...
4
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3answers
74 views

Why does driving a screw in spurts work better?

When you drive screws into wood with a driver or drill, it is often the case that mid-way through the process the screw will suddenly bind and eject your bit (assuming it's not a Robertson or Torx). ...
0
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1answer
42 views

Why is desaturated orange = brown, but desaturated blue is just plain blue? [duplicate]

As per wikipedia, "brown" refers to long wavelength hues, yellow, orange, or red, in combination with low luminance or saturation. So what about the short wavelength hues? Is there any ...
2
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2answers
60 views

Why does water keep dripping out of the bucket even after the faucet is turned off?

So I just noticed that when I filled my bucket with water until it overflowed and then I turned the faucet off, the water kept dripping for like 20 seconds. Why does this happens? Shouldn't it have ...
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0answers
24 views

“Cooling down” a column thermometer

Typical medical thermometers based on a capillary mercury or fluid column expansion usually require employing centrifugal/acceleration methods to drive the fluid back to the bulb after performing a ...
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2answers
32 views

Propagation of rate of fluid flow in a home

Suppose I have a large home with two windows. Assume the home forms a perfect seal and does not leak fluid other than from open windows. The window in the bottom of the home is open. The window on the ...
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2answers
66 views

Why does ground reaction force decrease at the start of a vertical jump?

I don't understand why reaction force would decrease at the start of a countermovement jump. I've tried looking at this diagram and considering moments and how lowering the position of the center of ...
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2answers
35 views

Working of a desert cooler?

Does level of water have any effect of the capacity of cooling in a desert cooler ? The fan rotate with a constant angular velocity so how and why does the water level effect the coolness capacity ...
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1answer
34 views

Why does a bike skids on the sand?

Whats the theory behind bike skidding on the sand? Is it related to friction and if then why it skids. Is that the sand has more friction if so then pedaling should be difficult rather than skidding.
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2answers
48 views

Is it dangerous to put a pressure cooker under cold water after cooking?

After cooking using a pressure cooker, it usually takes a while for the pressure to be released and for the cooker to be opened. However when I think the food may have been slightly overcooked, I take ...
3
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2answers
106 views

What actually causes even slow walking sounds from the upper floor to be heard?

I'm not sure where else to ask this question but I thought this might be sort of a relevant place. It's a question that's bothering me for a long long time. I'm staying in an apartment where there's a ...
2
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3answers
66 views

Moving with constant velocity in presence of net force

If I neglect air resistance is it possible that I can walk with constant velocity? Suppose that I take equal steps of equal length every second and therefore my velocity doesn't change. That means ...
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2answers
68 views

Why does sound travel slower through solid than through air here?

We know sound travels faster through solids than through air. Now consider this: Perhaps two people A & B are standing in two adjacent rooms both of which are closed from all sides. Let distance ...
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1answer
43 views

Why do doors and windows automatically open during windy season?

Suppose air is flowing from west to east and door is facing north . Now, i know using Bernoulli's equation the air outside is flowing at higher speed when compared to air inside which creates a ...
2
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3answers
359 views

Why does it take different levels of effort to lift two objects with the same mass?

Suppose we have two different objects, one denser than the other. In short, what I mean is that one object is bigger than the other but they have the same mass. Now why does it take different efforts ...
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1answer
53 views

Can a fan in a room cool down objects?

Does a fan cool objects? I have a ceiling fan in my office which really helps to keeps the room cool. Does it also cool down vitamins in a plastic bottle with a screw on top? My office can get very ...
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0answers
52 views

At what slope angle does walking uphill become more energy-efficient than cycling?

At what angle does walking uphill become more energy-efficient than cycling? To me cycling uphill feels harder than walking uphill, so I wonder at what slope-angle this happens. Two other ways to put ...
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0answers
25 views

Problem-solving: 2 ice packs vs 1 ice pack

I have two reusable gel ice packs for cold therapy for my knees. The more often they can be applied to my knees, the better. I need both knees to have equal amounts of cold therapy. There are two ...
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1answer
39 views

Why does water spread when thrown?

I have noticed that when you throw a bucket of water (or any other liquid), it spreads out. Why does it not stay clumped together like a ball or the shape of the container it was thrown from?
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1answer
79 views

Why does the glass move?

I have observed at my home that when there is a small puddle of water on a glass table and an inverted steel glass is kept on that puddle of water, the glass starts moving on its own after some time. ...
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2answers
47 views

Liquid can lift a small piece of paper?

Imagine you have a small piece of paper in your hand. Your hands are sweaty and due to perspiration, the paper kind of bends up. Can you explain what is happening? Is it the capillary forces?
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1answer
35 views

Why does hair dry faster when I have less hair?

I recently had a haircut, and have noticed that water in my air dries up faster when I short hair. I assume that hair loses water due to evaporation. We have been taught that evaporation is faster ...
21
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3answers
2k 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 $h$ there is a greater probability that it might break, when compared it to a chalk of length $\frac{...
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0answers
20 views

Why does the pitch of an ice cube hitting against the side of a glass increase as the glass empties? [duplicate]

When dropping several ice cubes into a full glass of water, I've noticed that the pitch of the cubes hitting against the side of the glass is much lower than if the glass contains less water - the ...
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3answers
61 views

Are falling objects harder to push compared to objects at rest

While an object is still in the air falling under the influence of gravity, does it take greater force to push or steer it to the side compared to when the object is in a state of rest?
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1answer
75 views

Why does bottle with long straw get emptied first?

Two identical bottles with different straw length are filled with identical liquids (obviously up to the same height as depicted in the picture). Bottle with long straw is emptied first.What can be it'...
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1answer
23 views

In which household equipment can i find an alternator or a generator or a dynamo (about 17V)? [closed]

equipment required: dynamo or an alternator or generator (all should be small about 17V). As due to COVID19 i am unable to buy any of the mentioned equipment as the online shopping service providers ...
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2answers
66 views

Teaching Electromagetism to Life-Science Students

I am going to be teaching an introductory university class on E&M and Modern Physics (from Coulomb's Law through Maxwell's Equations and optics, followed by a brief mention of quantum and ...
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2answers
130 views

Cooling behaviour of beverage

I offer my colleague some milk in her coffee. The milk has just come out of the fridge. "Not now," she says. "Not till after I've finished my sandwich, and I don't want it to go cold." So: identical ...
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1answer
31 views

Weight is storage for energy, right?

Since weight is storage for energy, the light vehicle will have a slight advantage on the flat ground due to low stress applied on wheels meaning less friction pulling the vehicle back. When though, ...
0
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1answer
38 views

Has physics ever tried to explain how do we get “sensorial experiences”? [closed]

To be clear about what I mean with "sensorial experiences", let's take for example our visual experiences. Certainly, physics (and other sciences) explains a whole process which involves light ...
39
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4answers
6k views

Why are steel thermal mugs much better than plastic ones?

I have several thermal mugs, two of them by the same brand, have the same look, shape and size except that one is in steel (inside and outside) and the other one, plastic. Both have an insulating ...
12
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4answers
2k views

Why would frozen sausages defrost faster in water?

My mom uses frozen sausages for a soup. She defrosts frozen sausages by submerging them in water (room temperature I believe). She claims this makes them defrost faster. She learned this from some ...
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1answer
48 views

How can the water droplets form on the top of the plastic bottle?

After I was drinking water in school, I flipped top-to-bottom the bottle. At that time, I was wondering how it is possible to form the water droplets on top of the bottle; inside the bottle. I ...
0
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2answers
50 views

Dispute over the movement of hot air and cold air [closed]

My neighbour and I share a small window at the end of the corridor in the block of flats where we live. She often wants to close this window leaving notes on the window saying: "You (me) are ...
3
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1answer
48 views

Does Bernoulli's equation describe why my curtains stick to the mesh?

I was sitting right in front of a big window (with a mesh) with curtains open, suddenly wind swooshes in, curtains sway forth and back. While they sway backward, they stick to the window(mesh) as if ...
2
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2answers
161 views

Open window in hot room, how fast will temperature equalize? [closed]

I am currently sitting in a warm room. I just opened a window to the outdoors, where it is cooler. Middle school science says the warm air should move toward the cool air, which should (in theory) ...
3
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1answer
56 views

Why wind stops flowing through a window when the door is closed?

If there is a room filled with air and it had a door and a window, air only blows at a high speed through the window if the door is open. The wind stops if the door is closed. Does the air behave ...
0
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1answer
34 views

If you exhale and sink, then crouch underwater, why will you bounce?

I don't understand the step under the red arrow. I'm assuming that the blue line isn't the ocean floor, for we're assuming "deep waters". I happened upon this picture on Reddit. After you "exhale and ...
2
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2answers
45 views

Why is it easier to bend a note down on a brass instrument than it is to bend up?

When playing a brass instrument, on a given harmonic, you can bend the pitch above (to a higher pitch) and below (to a lower pitch) where it sounds the best (while staying on the same harmonic, with ...
20
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1answer
767 views

Why isn't the surface of this frozen iced tea smooth?

Why is the surface of the iced tea in the pictures below so uneven? To give more details, today I tried (and failed) making iced tea. I placed a cup of hot water, after removing the tea bag, in my ...
0
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1answer
44 views

Friction Between Magnets

I have heard this definition of friction: "Friction is the resistance to motion of one object moving relative to another." So is there any friction between the same poles of 2 magnets? I can feel ...
1
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1answer
46 views

Rainbow Colors on a Water Droplet on a Screen

I accidentally fell a water droplet on my mobile phone's screen. But on observing closely I saw that the water droplets showed rainbow colors (the screen was mostly white). By rainbow colors I mean ...
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1answer
17 views

Water Evaporation on Earthen Pot

In earthen pot water molecules lose heat energy, so where is the temperature drop more - on the pot's surface or inside water?
4
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2answers
72 views

Why can you in physics exercises neglect the effect of air drag in case of basketball but not in the case of ping pong ball?

This is not a homework question or anything. I have finished schools and I always wondered why in physics exercises you can neglect the effect of air drag for example in case of basketball and I haven'...
1
vote
1answer
46 views

Does an induction cooktop attract or repel the base of a pan?

My first guess would be that the frying pan would be attracted to the induction coil just as any ferrous metal to a solenoid. But I recently found out that an induction coil can actually be designed ...

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