Asked by Anonymous
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 8 rotations in 20.7 seconds when twirled.
What is the block's tangential (linear) speed?
What is the block's angular speed?
What is the block's tangential (linear) speed?
What is the block's angular speed?
Answers
Answered by
bobpursley
see other post
Answered by
Eddy
You have this equation:
Velocity = 2pi x radius / T
So...
V = 2pi x 0.7 meters / (20.7 sec / 8 rotations)
That should give you the right answer. As a note, T, the time it takes to complete a period, has a unit of sec / rotation in this case, even if it may be more intuitive to calculate for rotations / sec (what I did before I realized that was wrong).
Velocity = 2pi x radius / T
So...
V = 2pi x 0.7 meters / (20.7 sec / 8 rotations)
That should give you the right answer. As a note, T, the time it takes to complete a period, has a unit of sec / rotation in this case, even if it may be more intuitive to calculate for rotations / sec (what I did before I realized that was wrong).
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