All stoppers are of equal strength.
D is best
I don't understand the constraints. Is there something unseen trying to turn them in the direction shown but not allowing any sideways motion? Or would sideways motion be allowed to occur along with rotation? Are we being g asked which would require the most torque to break the stoppers?
I assumed it was "which one has the highest friction coefficiency.
N
A and C are the obvious toss outs.
without being able to direct measure the length the position I'm inclined ( yes I went there) to say B has the longest moment of inertia to overcome if the torque applied is instantaneous and that's my final answer.
I'm just a biologist.
If the coefficient of friction between the block and the stoppers isn't extremely high, there is a wedging action in b that increases the force on the stoppers. I go with d.
Here, chew on this for a while.....Harvard Students couldn't solve, but kindergarten kids could!
No
the sun.
I'd go with B
i will go with "C". it is the only one not symmetrical.
First puzzle, you figure it out: https://twitter.com/engineers_feed/status/1646768107132968961
Second puzzle answer: No
What about a plane on a conveyor belt?
If it can't take off, then its not a plane is it.
Well, since airplanes don't power the wheels, it really doesn't matter what the conveyor does.
It'd better be one very long conveyor, though.
If the plane can't move forward it can't generate air over the wings to generate lift, but it can move forward by the thrust of the engines.
We had a few professors in our Engineering classes who loved to challenge us with similar problems that were not directly tied to what we happened to be studying at the time. Some of the discussions outside of the classroom could go on for hours. We were forced to challenge our own assumptions and biases. A very healthy exercise.
Had a fellow try to convince me that the weight of an object was dependent upon how it was to be lifted. Say it was a bag filled with some loose material weighing a total of 50 pounds. To bend down and pick it up was no big deal. But, if you were to tie a rope around it and then stand on a raised platform, the action of hoisting it, by hand, was far harder work, therefore the weight must have increased.
