Toast lands jelly-side down You are preparing the breakfast table with coffee and a plate of toast. While setting the plate down, you accidently tilt it slightly so that the toast slides off and falls to the floor. It always seems to land jelly-side down. Newton’s laws and the laws of rotational dynamics are partly to blame. The toast leaves the plate with a small rotational velocity and continues to rotate as it falls. From the height of a typical table, this small rotation almost always causes the toast to make a one-half rotation and land jelly-side down. If it started at a higher initial position, like your elbow when standing, it might have a greater number of rotations and land jelly-side up; but if slightly tilted when landing it might bounce and flip over with jelly-side down. If it first lands jelly-side down, it does not bounce but remains stuck to the floor. Another interesting observation is that the toast lands jelly-side down only if it slides slowly off the plate. If it is shoved from the table with high velocity, it can land either way.
Which of the following is a correct statement about water turbines?
(a) Water turbines can operate only in moving tidal water.
(b) Water turbines can produce only a small amount of electricity.
(c) Water turbines have not had a proof of concept.
(d) Water turbines cause significant ocean warming.
(e) None of the above are correct statements.
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