# Tag Info

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Although the photon appears to exist without physical volume or geometrical size, we can measure the region where the wave's magnitude is non-negligible. This happens at about half a fermi, or roughly $0.5*10^{-15}$ m.

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Using a measuring tape, measure the circumference of the person at as many points as you see fit. Try to space your measurements evenly. The total area is the sum of all the circumferences times the average spacing between them. This will get your quite close to the right answer - certainly better than the "coat the subject in honey" answer which is fraught ...

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fun question. (Find a candidate;) take a given volume $V$ of honey (or paint, or anything dense, sticky and safe enough); cover the body with it; measure a mean thickness $h$ of the film around the body (take as many points as needed around the body); measure the volume $V_o$ of honey left in the jar, ($V-V_o$ is the volume used); the approx. surface of ...

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The obvious method is to burn a barrel of crude oil and measure how much energy is released. The only slightly less obvious method is to burn a small amount of oil and measure how much energy is released, and then mathematically figure how much energy a whole barrel would release, as @CuriousOne points out. The latter method is superior in both the ...

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If light of intensity $I_0$ is incident on a sample or a dielectric interface, at the boundary the following equation will hold: $$I_0 = I_T + I_R + I_A$$ where $I_T$ is the transmitted light, $I_R$ is the reflected light and $I_A$ is the fraction of light which is absorbed by be medium. The absorption is usually calculated from the Beer–Lambert law \phi_T ...

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I'll reduce your question to its simplest expression: "What is mass?" And give you my best, simplest answer:"It is a measurement of how much an entity opposes acceleration or deceleration". I believe that in the end it all comes to that...

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Here's how to measure stellar aberration: Take a telescope and point it straight up. Attach it to something massive and steady, like a chimney stack. Let the scope act like a pendulum. It's fixed at the top, and moves at the bottom. The plane in which it swings is the local meridian. That is, it only swings north-south, not east west. With this setup, you ...

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No, this is not possible at least in the way you are implying. Chemical potential as temperature are abstractions that apply to large systems as a whole, because they depend on equilibrium conditions, or in other words, they rely on fluctuations being much smaller than average values. You don't measure temperature directly either, once your thermometer is ...

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The punch can be landed on the table and the ball is pushed through the liquid column and naturally the height the ball rises the force can be calibrated, Now you want to build the machine that can be put to a wall. so you can make adjustments to the design or even get a different idea from this. You drop a known weight at a measured height and ...

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In addition to the other answers, you can forget about the board altogether and simply use a punching bag. You can measure the angle that is displaced by your hand on the punching bag using some kind of video tracking device or a gyroscope attached to the punching bag. Thus you will be able to detect angle displacement, potential energy and/or torque which ...

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(1) Measure out and draw a fine grid on the surface of an air hockey table. (2) Set up a camera of known frame rate above the table facing down. (3) Place a large, flat bottomed, relatively light object of known mass on the table, make sure it hovers freely. (4) Punch the object horizontally, then analize footage to find impulse. (Note) If you want to ...

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Physics is about making models of the world, if you can make them as accurate as possible why wouldn't you? Incidentally, sometimes you really need acuracy as the smallest difference in your initial conditions can make a great difference in your outcome (see chaotic systems, the best example is weather or the double pendulum) Imagine instead of taking ...

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