Part A What is the angular momentum of a figure skater spinning at 3.5 rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.4 m, a radius of 14 cm, and a mass of 48 kg ? Express your answer using three significant figures and include the appropriate units. L= Submit Part B μA Submit Value Request Answer How much torque is required to slow her to a stop in 4.4s, assuming she does not move her arms? Express your answer using three significant figures and include the appropriate units. μA Value Units Request Answer B) ? Units Review | Constants ?
Angular Momentum
The momentum of an object is given by multiplying its mass and velocity. Momentum is a property of any object that moves with mass. The only difference between angular momentum and linear momentum is that angular momentum deals with moving or spinning objects. A moving particle's linear momentum can be thought of as a measure of its linear motion. The force is proportional to the rate of change of linear momentum. Angular momentum is always directly proportional to mass. In rotational motion, the concept of angular momentum is often used. Since it is a conserved quantity—the total angular momentum of a closed system remains constant—it is a significant quantity in physics. To understand the concept of angular momentum first we need to understand a rigid body and its movement, a position vector that is used to specify the position of particles in space. A rigid body possesses motion it may be linear or rotational. Rotational motion plays important role in angular momentum.
Moment of a Force
The idea of moments is an important concept in physics. It arises from the fact that distance often plays an important part in the interaction of, or in determining the impact of forces on bodies. Moments are often described by their order [first, second, or higher order] based on the power to which the distance has to be raised to understand the phenomenon. Of particular note are the second-order moment of mass (Moment of Inertia) and moments of force.
![Part A
What is the angular momentum of a figure skater spinning at 3.5 rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height
of 1.4 m, a radius of 14 cm, and a mass of 48 kg ?
Express your answer using three significant figures and include the appropriate units.
L =
Submit
Part B
μA
Value
Request Answer
μA
How much torque is required to slow her to a stop in 4.4s, assuming she does not move her arms?
Express your answer using three significant figures and include the appropriate units.
|T|= Value
Units
Submit Request Answer
B] ?
Units
Review | Constants
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