[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 194
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Муха состоит из воды, белков, углеводов, жиров, витаминов и минеральных веществ. Короче, всё, что нужно :)
Oh, yeah. Do you have a fly skeleton too?
:)
I'm still wondering how to meditate on mass and weight to see volume
More precisely, on weight and "other" weight.
Solution
1. Kettlebell density = mass of kettlebell / volume of kettlebell
2. Find the mass of the kettlebell by weighing it on a scale. You obtain the mass of the weight unit = 100g.
3. Remove the spring from the scale.
4. Hold it with your fingertips by its fixing ring
5. Hang the weight on the hook
6. Swing it left and right with slight movements, the swing should be less than 1 cm, there should be no stretching or oscillation of the spring length
7. Imagine as accurately as possible the spring with the weight as a point pendulum on a thin, strong string
8. Count the number of vibrations in 60 seconds
9. Find the period of oscillation T = 60 seconds / number of oscillations
10. Using the formula for a pendulum
(T/2*pi)^2=(l/g)
where T is the period of oscillation, l is the length of the pendulum, g = 10 m/s^2 is the acceleration of free fall,
Find the length of the pendulum l = ( T / 6.28 ) ^ 2 * (10 m/s^2) = T^2 * 0.25 m/s^2
11 For example, if the period of oscillation is 0.2 s, the length of the pendulum will be = 0.1 m = 10 cm
12. measure on any surface the length of the pendulum
13. Using a pencil we draw a scale of scales on the measured length.
14. We give on 10 cm a certain number of notches, for example 50.
15. Calculate the pitch of the notches = 10 cm / number of notches = 0.2 cm.
16. With this accuracy measure the diameter and height of the cylindrical weight, e.g. 2.4 cm and 2.4 cm
17. The cross-section of the cylinder is a circle of area =pi * r^2 = 3.14 * (1.2 cm)^2 = 4.5 cm^2
18. The volume of a weight is = sectional area * height = 4.5 cm^2 * 2.4 cm = 11 cm^3
19. Consider the mass of the kettlebell handle and other small things as small values
20. Calculate the density of the kettlebell = 100 g / 11 cm^2 = 9 g/cc^3
Answer: 9 g/cc.
Weights can be of any type and density
The kettlebell is a piece of metal in a black plastic sheath, the handle is made of wire,
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Here are the previous couple of descriptions of the shape of the kettlebell
You now have a fancy cylinder.
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There's nothing to tell.
Good thing I went to the movies.
Not to mention the disassembling of the (probably not feasible) spring weights, that is unacceptable frivolity by default
The volume of the ball is also easy to calculate
The point is different
Ais писал(а) >>
6. Swinging left and right with slight movements, less than 1 cm, no stretching or wobbling of the spring length
I would like to be able to measure exactly 1 cm
Объем шара также легко вычисляется
Суть в другом
I think the point is that you were making it up as you went along.If it says disassemble, it means disassemble
If it says it can be disassembled, it can be disassembled.
I always tell the truth
Words and deeds
Customary circumstances