Name PHYS 1408 Lab Homework- Rotational Dynamics This homework is due when you c
ID: 2038521 • Letter: N
Question
Name PHYS 1408 Lab Homework- Rotational Dynamics This homework is due when you come to lab the week of April 9. Charles, Roscoe, and Buster are investigating rotational dynamics in their Physics Lab. Using the apparatus below, Buster places a disk with a mass of 425 g on the apparatus. Roscoe then hangs a 30 g mass from the pulley and releases it. The 30 g mass drops and then rises back up. They each graph the angular velocity as a function of time for the drop and rise. Their graphs are shown below. Only one is correct. Identify the correct graph and explain why it is correct. (10 pts). For the incorrect graphs, explain why they are not correct. (two explanations at 10 pts each 20 pts for this portion; 30 pts total.)Explanation / Answer
SOL)
The middle graph(2nd picture) is the correct answer.
because, gradually angular velocity increases becomes maximum
and gradullay decresases and becomes zero.
and the direction of angular velocity changes when mass rises back up.
In the first picture initially angular velocity gradually increasing and becomes constant.
it means the pulley is spinning with constant angular velocity.
it means the mass caninuously falls down.
In the third picture initially angular velocity increasing and after some time it decreassing and becoming zero.
It means after some time the mass comes to rest and never rises back up.
so, the correct answer is 2nd picture.
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