Consider the following four objects: a hoop, a flat disk, a solid sphere, and a hollow sphere. each of the objects has mass m and radius r. the axis of rotation passes through the center of each object, and is perpendicular to the plane of the hoop and the plane of the flat disk. which of these objects requires the largest torque to give it the same angular acceleration?

The hoop

Explanation:

We need to define the moment of inertia of the different objects, that is,

DISK:

HOOP:

SOLID SPHERE:

HOLLOW SPHERE

If we have the same acceleration for a Torque applied, then

The greatest momement of inertia is for the hoop, therefore will require the largest torque to give the same acceleration

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2