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Warming-up

Arithmetic

Geometry

Physics

Warming-up

Disassemble the structure and draw the blue and red parts separately

Could you make such a fork? 😉

Add one sick to make equality true

you need to ADD just ONE stick to achieve EQUALITY 👌

Count the bars 😉

Arithmetic

In a hot summer, a man bought 200 pounds of cucumbers. Cucumbers were 99% water (by weight). What was supposed to save man from thirst 😉

While man was driving home, the cucumbers dried up a little.
The water in them became 98% (by weight).

Did man notice this, at home, when he began to unload the cucumbers? 🤔

(check answer)

Let's find what has not changed - the "dry weight" of cucumbers (excluding water).
When buying, it was (100% - 99%) = 1% of the weight. From 200lb it is 2lb.
When man came home, the "dry weight" did not change (2lb),
but now it was (100% - 98%) = 2% of the weight.
Let's find the new total weight X of cucumbers:

Let's make a proportion: Xlb / 100% = 2lb / 2%.
And we get:

X = 2lb × (100/2) = 100lb

Any man have noticed the difference! 😧

Geometry

There are: square, equilateral triangle and regular pentagon.

What is the angle WUV?

Physics

Two balls - red and blue - move without friction with the same initial velocity from left to right (from A to B ).

Which ball will travel the AB path faster? Or will the travel time be the same?

Of course, the length of the path, the depth of the hole and the height of the mound, the radii are all the same.

About fridge

There is working refrigerator in a closed room.
Will the room temperature change if the refrigerator door is opened?
If it changes, how? Why?

What is the fastest path?

Let's consider two areas - 1 and 2 - where the speeds of movement of something (light or cart) are different: V1 and V2, respectively. Their border is a straight line.

Task: find a way from point A to point B, such that the travel time is minimal.

Solution

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