Question

Experiment 11 79 Questions Does the uncrainty in the theoretical value of a ccount for the discrepancy in the extent mental and theoretical values of lama? Did you find different values of W. for the three setups? If so, do the differences make physi- Dis why is much larger than lane when the two bodies are of about the same mass! and dimensions. Base your discussion on eq. 11-2 4. Is the kinetic energy of the descending mass really negligible compared with that of the rotat- ing objects as claimed above eq. 11-92 The ratio of the two kinetic energies is mu lo This may easily be shown to be: = m D'/41 (11-11) by using eq. 11-7. Use a typical falling mass, m= 100 g, and your values for D and Loing and com- pute the right hand side of eq. 11-11 Dand m must be expressed in the MKS system. Discuss.

question 3 please

Answer 1

Q-3

I_ring and I_disk , both objects have same mass M and size say of radius R

I_ring = MR² ; I_disk = MR²/2

In case of a ring the mass is all concentrated at the edge. every particle is positioned at the same distance from the center of rotation.

By definition moment of Inertia is

I = $\Sigma$ m_ir_i

In the case of a disk the mass is distributed over a lager area, some particles are closer to the center of rotation and some are farther from the center. The mass is continuously distributed.

the product m_ir_i is less for some and large for some, continuously varying from 0 to some max. value.

hence the MI is larger in the case of ring compared to a disk