II. A cockroach of mass m, lies on the rim of a uniform disk of mass M = 4.00 m. that can rotate freely about its center like a merry-go-around. Initially the cockroach and disk rotate together with an angular velocity of 0.240 rad/s. The cockroach then walks halfway to the center of the disk and stopped. a) What is the angular velocity of the cockroach-disk system after the cockroach stopped? What is the ratio of the final kinetic energy of the system to its initial kinetic energy? (the rotational inertia of the disk is -Mr'and treat the cockroach as a single particle). c) Where does the energy difference come from?
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.
![to drop a package of supplies to isolated mountain climbers on a rocky ridge 196 meters below, If the helicopter is traveling
of 72 meters per second (a.) how far in advance of the reciplents (horlizontal ditance) must the packege be dropped (figure a) (b.)
e helicopter releases the package a horizontal distance of 360 meters in advance of the mountain climbers. What vertical velocity
ven (up or down) so that it arrives preciesly at the climbers position (figure b).
hrice O2A
II. A cockroach of mass m. lies on the rim of a uniform disk of mass M = 4.00 m. that can rotate freely
about its center like a merry-go-around. Initially the cockroach and disk rotate together with an
angular velocity of 0.240 rad/s. The cockroach then walks halfway to the center of the disk and
stopped. a) What is the angular velocity of the cockroach-disk system after the cockroach stopped?
What is the ratio of the final kinetic energy of the system to its initial kinetic energy? (the rotational
inertia of the disk is
Mr'and treat the cockroach as a single particle). c) Where does the energy
difference come from?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fda1bb534-4c29-4f5a-b750-1e08cb95b058%2F2b05938d-5d41-4df5-9ab2-8956f9428df3%2Ft44wn08_processed.jpeg&w=3840&q=75)
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