FIGURE 11-9
-The L-shaped object shown in Figure 11-9 consists of the masses connected by light rods. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s about an axis perpendicular to the x-y plane and passing through the origin?
A) 207 J
B) 185 J
C) 122 J
D) 104 J
E) 265 J

Question

FIGURE 11-9 
-The L-shaped object shown in Figure 11-9 consists of the masses connected by light rods. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s about an axis perpendicular to the x-y plane and passing through the origin?
A) 207 J 
B) 185 J 
C) 122 J 
D) 104 J 
E) 265 J

Quizplus · Accepted Answer

The work done is calculated using the formula for rotational kinetic energy: $ W = \frac{1}{2} I \omega^2 $, where $ I $ is the moment of inertia and $ \omega $ is the angular speed. Given the correct moment of inertia for the system, the work done to reach 3.25 rad/s is 207 J.

FIGURE 11-9 -The L-Shaped Object Shown in Figure 11-9 Consists of the Consists