

Understanding Earth's Rotation and Timekeeping
Interactive Video
•
Physics
•
9th - 10th Grade
•
Practice Problem
•
Hard
Jennifer Brown
FREE Resource
5 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How much longer does a day get on average every 100 years due to Earth's slowing rotation?
Ten milliseconds
Five milliseconds
One second
Two milliseconds
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What was the original definition of a second based on?
Atomic clocks
Ephemeris second
1/86,400 of a solar day
Newton's laws of motion
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In which year was the SI second redefined based on atomic clocks?
1820
1975
1967
1960
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why do we not add leap seconds on a precise yearly schedule?
Earth's rotation has irregularities due to factors like earthquakes
Leap seconds are added every decade
Leap seconds are unnecessary
Earth's rotation is perfectly regular
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What causes the current frequency of leap seconds?
The rapid acceleration of Earth's rotation
The alignment of the solar system
A preexisting difference in the size of an SI second and 1/86,400 of a day
The stability of atomic clocks
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