Which answer best describes thermal energy?
1 answer:
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Answer:
3. Her angular speed increases because her angular momentum is the same but her moment of inertia decreases
Explanation:
II ωi the intial angular momentum of the skater. Her angular momentum changes to If ωf after pulling her arms in.
It must be noted that If is less than II, then it is because her arms now go round not far from the rotation axis which brings down the mementos of inertia.
Angular momentum does not change since torque is O.
Note: the mathematical representations are better written on the attached diagram.
Answer:
49.79 m/s
Explanation:
Given:
Initial velocity of the roller coaster is,
Vertical drop or the displacement of the roller coaster is,
The displacement is negative as the motion is in downward direction.
Now, as the motion is in vertical direction only, the acceleration of the roller coaster will be due to gravity acting in the downward direction.
So, the acceleration of the roller coaster is,
Now, using the following equation of motion:
Where, 'v' is the velocity of the roller coaster at the bottom.
Plug in all the given values and solve for 'v'. This gives,
Therefore, the speed of the roller coaster at the bottom of the drop is 49.79 m/s.