# Tagged Questions

questions concerning measurements, experiments, and activities that demonstrate physics and are safe to do at home, require at most one tool or ingredient not readily available, and can be interpreted or analyzed on one sheet of paper with accessible math.

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### Why don't get I shocked in an electric shower if the resistance makes contact with water?

I've found this image that perfectly illustrates my shower. I've read somewhere that the resistance is insulated so even if it touches the water, it doesn't conduct. However, as you can see, the ...
238 views

### does a rocking kettle cause the water to boil more slowly?

When I boil water in the kettle on my electric stove, sometimes it rocks back and forth making an annoying sound at a frequency of about 6Hz. When that happens, I move the kettle slightly to make it ...
73 views

### Coefficient of friction and practical experience of sliding

The classical model of friction has a coefficient of friction depend only on the materials, but not area, and the force proportional to the normal force and coefficient of friction. So a given object ...
62 views

### Is the video “How to Reveal Subatomic Particles at Home”'s explanation of its experiment misleading?

https://www.youtube.com/watch?v=wN_DMMQEhfQ The video asserts that along the path of an electron or muon, a trail of condensation will appear. But from what I understand, if an electron or muon (both ...
91 views

### How to measure the range of a horizontal projectile?

For an experiment, I'm launching a projectile horizontally to determine the relationship between height and range. Pretty basic stuff. But I'm having trouble coming up with an effective way to measure ...
3k views

### Potential energy from opposing magnets repelling each other with a gap of 1 mm

I have two powerful rare earth magnets, that are separated by a distance of 1 mm. I applied energy to bring them closer to each other, hence increasing the potential energy. Now, when one of the ...
35 views

### What mechanism explains the effect of a hot surface on hydrogel balls?

Adding little hydrogel balls to a hot surface has an interesting effect as seen in this video. Hydrogels (as the name suggests) contain a lot of water but rather than melt or burst, the little balls ...
73 views

### Are there any tests of quantum field theory one can do using everyday objects?

One of the reasons I love physics is because many of the theories I can test using everyday objects around me. For example I can predict how long it would take for me to drop the ball of a roof using ...
246 views

### Does the termination point(level) influence water flow from a pipe

I get water to my home from a nearby Tank A at a certain height above ground level. I have a 1" pipe through which I get this water to my home.. I leave this water into my well by connecting a 1" tube ...
17 views

### Current thru two series resistors, 1 small, 1 large

I have a circuit that has series resistors for a switching regulator. Voltage is 6V. There's a "current sense resistor" of .05 ohms followed by another resistor of say 1K. There's 1A flowing. The ...
28 views

### How to insulate static electricity

This is a follow up question to Extending the reach of a crocodile clip for Kelvin Water Dropper experiment. We have resolved the issue, but now we have the following cable (in the image) that ...
51 views

### resistance of wires

i have an upcoming open investigation at my school on wire resistance, in preparation for it i want to find out if duct tape would effect the multimeter's readings. i need to connect wire to a ...
91 views

### Colour changing material/ink

i am not sure if this is the right place to ask but is it possible for me to make an ink or material that changes colour when electricity goes through it at home? (as much colours as possible and low ...
347 views

### Simple air resistance experiment

I have a paper plate, and I'm taping paper streamers to it. I have 0, 1, 2, 3, and 4 streamers. I tried to place the streamers at places equidistant from the next. 2mm are attached to the plate and ...
581 views

### How does temperature affect magnets?

How does an increase/decrease in temperature affect: Strength of the magnet Polarity Other changes? I have made some research and I have found that increasing the temperature turns ferromagnetic ...
334 views

### How to prove R value for insulation?

I ran some tests on different types of insulation. I heated water, and placed it into an insulated box. The temperature was recorded every minute, for the water, as well as the air. The insulation ...
740 views

### How much pressure is needed to break an egg if applied from top and bottom?

Everybody knows that you can't break an egg with our fingers when pushing from top and bottom. I assume if we could squeeze hard enough the egg would break?
29 views

### A cheap experiment to verify that a monitors intensity response is not linear

For the past year or so i have had to answer different questions on how the intensity response of a monitor behaves, nearly every week. Many of you probably know that the monitor intensity response to ...
44 views

### Printing zone plate with laser printer

I tried to print my own zone plates on transparent plastic with laser printer with this generator. I prepared a lot of plates with different settings - focus from 4 to 60 cm, 3 wave lengths, etc. Yet ...
37 views

### Phenomenon of talking apple

Recently I noticed something weird when took a metal bowl with a few apples out of the fridge and left them to get warm. After a while I heard a distinct sound in the form of sharp clicks approx. ...
45 views

### Angular momentum transfer in a bottle vortex

A colleague and I were discussing the following fluid mechanics experiment, which most people have probably tried in their kitchen: take a bottle full of water (a 2-litre transparent soda pop bottle ...
79 views

### Is there a cheap way I can do a Bell inequality experiment?

My work is almost completely theoretical/computational. But I'd really like to do a Bell inequality experiment just so I can personally see this (the best way to learn something is hands-on, right?) ...
55 views

### Layman explanation and demonstration of positive lightning

Inspired by the thunderstorm overhead, and after reading the question and answers Voltage and current of positive lightning - what is an effective means to explain this phenomenon to a layman? Also, ...
153 views

### Calculate how hot PLA will become

I am trying to attach the shaft of a brass heating tip to a PLA component. My problem is that the tip will have to reach a temperature of about 200ยฐC and the PLA can only handle a temperature of about ...
212 views

### How can I determine the type of magnet used in a DC motor?

I repair electrical motors in a workshop and sometimes I must repair permanent magnet DC motors and other motors that use permanent magnets. I need to specify type of permanent magnet (Ferrite or ...
23 views

### Heat exchanging Questions

I hope I am able to ask this in the way I am thinking about it. Is there a point, or at what point does water become ineffective for heat exchange. The reason I am asking, (My real world ...
39 views

### Direct comparison of energy measurements for kids

I am planning a few physics & science sessions in the woods with 14 year-olds. The theme for one of the sessions is Energy, and my aim is to show them how gravity, solar radiation, wind (air ...
14 views

### portable battery packs for decorative lights

I a set of home decorative lights that is powered by a portable 2 x D cell batteries. Can I replace the current pack with a new pack that takes AA batteries
47 views

### Rain experiment failed. Why?

I tried to make rain with a bottle and a balloon but it failed. The bottle was small, only a couple inches wide and the threaded part that I had the balloon on was less than an inch. In particular it ...
32 views

### Approximating Gallons of Gas Needed for Trip (read: physics grad. with too much free time)

My departure from college has left me with an itch for physics-y problems to solve, and my boredom and free time gave way to this approximation of the gallons of gas I use for the trip to my ...
48 views

### What factors are influencing a woosh rocket?

Not sure if this is too much chemistry, but I'll try: If I fill a plastic bottle with a small amount of rubbing alcohol, shake it around and hold a match to the bottle neck, I'll get a flame wooshing ...
57 views

### Any suggestion of laser pointer for everyday life study of fluorescence?

I want to buy a laser pointer to study fluorescence in my kitchen. Any suggestion? What kind of laser pointer? What stuff for demonstration?
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### Home experiment with airfoils and Reynold's number

I want to do an experiment about lowering the Reynolds number of an airfoil moving through air. I want to figure out how to lower the turbulence around an airfoil. So my two hypotheses to lower the ...
92 views

### I have some questions about reproducing Young's double slit experiment

I want to reproduce Young's double slit experiment for a school project. For the slits I am thinking making cuts in aluminium foil or maybe do something with pencil leads like this instructable ...
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### Solar still and how it works

I use a solar still that holds 182 cubic feet of water. Here is how it works: There is an insulator on both sides of the metal bowl. On the outside it covers the whole thing. on the inside it covers ...