Answer:
C. her moment of inertia increases and her angular speed decreases
D. her moment of inertia increases and her angular speed decreases
Explanation:
The moment of inertia of a body is the sum of the products of an increment of mass and the square of its distance from the center of rotation. When a spinning person extends her arms, part of her mass increases its distance from the center of rotation, so increases the moment of inertia.
The kinetic energy of a spinning body is jointly proportional to the moment of inertia and the square of the angular speed. Hence an increase in moment of inertia will result in a decrease in angular speed unless there is a change in the rotational kinetic energy.
This effect is used by figure skaters to increase their spin rate by drawing their arms and legs closer to the axis of rotation. Similarly, they can slow the spin by extending arms and legs.
When the person extends her arms, her moment of inertia increases and her angular speed decreases.
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<em>Note to those looking for a letter answer</em>
Both choices C and D have identical (correct) wording the way the problem is presented here. You will need to check carefully the wording in any problem you may think is similar.
Answer:
7.13559 knots
Explanation:
Maximum power = 10.5 kilowatts
where,
P = Power in kilowatts
s = Desired speed in knots
Here, P = 10.5 kW
The greatest speed of the Olympians was 7.13559 knots
Had to look for the options and here is my answer.
These white lights can be actually found in MID-CHANNEL MARKERS kind of bouys. Buoys are actually necessary because they aid in navigation and these come in different colors and each differ in meaning. Hope this answer helps.
If the forces on an object are greater than zero,the object will definitely in the motion. This concept in accordance with law of inertia.
<h3>What is force?</h3>
Force is defined as the push or pulls applied to the body. Sometimes it is used to change the shape, size, and direction of the body.
Newton's law of inertia states that a body wants to continue its motion until the external force is not acted on it.
Hence, if the force is grater than zero, the body will be in motion.
To learn more about the force, refer to the link;
brainly.com/question/26115859
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