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What does a second equal?
Since 1967, a second is defined as the duration of 9,192,631,770 periods of the radiation which corresponds to the transition between levels of the ground state of the Caesium 133 atom. An alternative definition is 1/31,557,600 of a Julian year.
Why it is valid to say that both a function and its inverse describe the same relationship.?
If a function has an inverse then it is a bijection between two sets. Each element in the first set is mapped to one, and only one, element of the second set. Therefore, for each element in the second set there is one, and only one, element in the first set. The function and its inverse, both define the relationship between the same pairs of elements.
How fast would a person have to go to travel five miles in 3 seconds?
In order to go five miles in three seconds, you would have to go 1.667 miles per second. Since there are 5,280 feet in a mile, that speed corresponds to 8,800 feet per second. Since there are 3,600 seconds in an hour, that speed also corresponds to 6,000 miles per hour.
What does proper subset means?
A is a proper subset of S if every element of A is an element of S and there is at least one element of S that is not in A.The second condition can also be stated as A � S
What is the difference between proper and improper subsets?
S is a proper subset of T ifall elements of S are in T andthere is at least one element of T which is not in S.S is an improper subset if the second condition does not apply.
