Recognizing that this is a Home Repair forum one must admit that posting
some interesting problems did invoke many comments and variations of the
solutions. Having said this I thought that a couple more might not be
objectionable to the HR group.
The first one is more enlightening than difficult--
1. Place a rope (about 25,000 miles long) around the entire earth and pull
it snug. Now cut it and then add another piece of rope 6 ft.long (rope is
now 25,000 miles + 6 ft.). Fix it up so that the rope stands off the
ground evenly all around the earth. How far off the ground is the rope?

2. Small boat in a pond. In the boat is a boy and a large cinder block. The
boy throws the cinder block overboard and it promptly sinks to the bottom.
Does the level of the pond rise or fall after the block is thrown overboard?
Obviously, assuming that the change in water level could be measured or
observed.

MLD