Last Problem:
A steel washer (used in conjunction with a bolt in construction work) with a hole in the center is heated until the metal expands by five percent (5%). Will the hole get larger, smaller or remain unchanged?
Answer:
Every dimension of the washer will expand, so the hole will get larger too as the washer is heated.
Today’s Problem:
Is it really dangerous to stand too near the edge of a platform where a subway passes through a subway station in New York City at high speed? Or, is that a myth perpetuated by overly anxious mothers and fathers?