A uniform solid sphere of radius R = 0.200 m and mass M = 1.85 kg starts from a height vertical H on an inclined plane and rolls DOWN the incline without slipping. The initial translational speed of the center of mass of the sphere is ZERO. Thus, the solid sphere begins from REST. Assume H= 20.0 m, about 66 feet. Use the rotational inertia I for a solid sphere. (PLEASE FIGURE 10. 21 IN THE E-BOOK OR ICQ16 for the rotational inertia of a sphere) I = (2/5) * MR². Show all work. If you do not consider the rotational part of the kinetic energy, you will get a zero on this problem. (a) 2 What is the final translational speed V₂ of the center of mass of the sphere at the bottom? (b) What is the final angular speed | o₂ | about the center of mass of the sphere at the bottom? IN OTHER WORDS, FIND THE MAGNITUDE OF THE ANGULAR VELOCITY AT THE BOTTOM. (c) problem? Explain. Did you need the mass M or the angle shown to solve this W₁=0 Las W₂ H 30° != ?

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**Title: Dynamics of a Rolling Sphere on an Incline**

**Introduction:**
A uniform solid sphere with radius \( R = 0.200 \, \text{m} \) and mass \( M = 1.85 \, \text{kg} \) starts rolling from rest from a vertical height \( H \) on an inclined plane. The sphere rolls down the incline without slipping. Initially, the translational speed of the sphere's center of mass is zero.

**Problem Statement:**
The sphere, starting from rest at a height of \( H = 20.0 \, \text{m} \) (approximately 66 feet), rolls down an incline. Use the rotational inertia \( I \) for a solid sphere, which is given by \( I = \frac{2}{5}MR^2 \).

**Questions:**
(a) What is the final translational speed \( V_2 \) of the center of mass of the sphere at the bottom of the incline?

(b) What is the final angular speed \( |\omega_2| \) about the center of mass of the sphere at the bottom? In other words, find the magnitude of the angular velocity at the bottom.

(c) Did you need the mass \( M \) or the angle shown in the diagram to solve this problem? Explain.

**Diagram Explanation:**
The diagram illustrates a sphere at the top of a 30-degree inclined plane with an initial angular velocity \( \omega_1 = 0 \). The sphere rolls down, reaching the bottom with a translational speed \( V_2 \) and an angular velocity \( \omega_2 \).

**Note:**
Failure to consider the rotational part of the kinetic energy will result in incorrect calculations.

**Conclusion:**
The exercise requires calculating the final translational and angular speeds using principles of rotational dynamics and conservation of energy. Understand the roles of mass, radius, and height in determining these speeds, considering the contribution of both translational and rotational motion.
Transcribed Image Text:**Title: Dynamics of a Rolling Sphere on an Incline** **Introduction:** A uniform solid sphere with radius \( R = 0.200 \, \text{m} \) and mass \( M = 1.85 \, \text{kg} \) starts rolling from rest from a vertical height \( H \) on an inclined plane. The sphere rolls down the incline without slipping. Initially, the translational speed of the sphere's center of mass is zero. **Problem Statement:** The sphere, starting from rest at a height of \( H = 20.0 \, \text{m} \) (approximately 66 feet), rolls down an incline. Use the rotational inertia \( I \) for a solid sphere, which is given by \( I = \frac{2}{5}MR^2 \). **Questions:** (a) What is the final translational speed \( V_2 \) of the center of mass of the sphere at the bottom of the incline? (b) What is the final angular speed \( |\omega_2| \) about the center of mass of the sphere at the bottom? In other words, find the magnitude of the angular velocity at the bottom. (c) Did you need the mass \( M \) or the angle shown in the diagram to solve this problem? Explain. **Diagram Explanation:** The diagram illustrates a sphere at the top of a 30-degree inclined plane with an initial angular velocity \( \omega_1 = 0 \). The sphere rolls down, reaching the bottom with a translational speed \( V_2 \) and an angular velocity \( \omega_2 \). **Note:** Failure to consider the rotational part of the kinetic energy will result in incorrect calculations. **Conclusion:** The exercise requires calculating the final translational and angular speeds using principles of rotational dynamics and conservation of energy. Understand the roles of mass, radius, and height in determining these speeds, considering the contribution of both translational and rotational motion.
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