(a) A unit of time sometimes used in microscopic physics is the shake. One shake equals 108 s. Are there more shakes in a second than there are seconds in a year? (b) Humans have existed for about 106 years, whereas the universe is about 1010 years old. If the age of the universe is defined as 1 “universe day,” where a universe day consists of “universe seconds” as a normal day consists of normal seconds, how many universe seconds have humans existed?

Question

(a) A unit of time sometimes used in microscopic physics is
the shake. One shake equals 108 s. Are there more shakes in a
second than there are seconds in a year? (b) Humans have existed
for about 106 years, whereas the universe is about 1010 years
old. If the age of the universe is defined as 1 “universe day,”
where a universe day consists of “universe seconds” as a normal
day consists of normal seconds, how many universe seconds have
humans existed?

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