Pure maths, physics, logic (braingames.ru): non-trade-related brain games - page 76
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PS It's a simple puzzle.
The answer is wrong.
This problem belongs to the class of intuitive puzzles with simple solutions -- my favourites :)
Breaking patterns -- learn your brain.
The minimum force to move any box if there is no spring is N*K (N is the support reaction).
Obviously, it is harder to move the big box at first. OK, apply a force to the small one in any chosen direction, it starts moving.
The big one will start moving when the spring tension or extension is greater than the minimum force to move it. And it doesn't depend on its stiffness - it will happen anyway, even if the small box is very small.
The answer is m*K*g.
The answer is wrong.
The answer is m*K*g.
No.
pull by M ?
No.
TheXpert:
Mathemat:
The answer is m*K*g.
No.
F = M*K*g
But you have to apply it to a small box.
The problem for loonies -- solve the same problem if you can arbitrarily change the vector of application of the force.
F = (M-m)*K*g.
First, you have to pull the small box with that force to one side, then change the vector to the opposite one.
F = M*K*g
But it has to be applied to a small box.
You don't take friction into account.
F = M*K*g
But you have to apply it to a small box.
No.