. A body of mass m and negligible size starts from rest and slides down the surface of a frictionless solid sphere of radius R. (See below.) Prove that the body leaves the sphere when 0 = cos¹ (2/3). R 0

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**Problem 72: Sliding Body on a Sphere**

A body of mass \( m \) and negligible size starts from rest and slides down the surface of a frictionless solid sphere of radius \( R \). Prove that the body leaves the sphere when \( \theta = \cos^{-1}(2/3) \).

**Diagram Explanation:**

- The diagram shows a sphere with radius \( R \).
- A small block is positioned at the top of the sphere and then depicted sliding down its surface.
- The angle \( \theta \) is measured from the vertical centerline to the position of the block along the sphere's surface.
- The point at which the block leaves the sphere is indicated by an arrow moving tangentially away from the sphere.
  
This scenario is analyzed to find the angle \( \theta \) at which the normal force between the block and the sphere becomes zero. At this angle, the body loses contact and leaves the sphere’s surface.
Transcribed Image Text:**Problem 72: Sliding Body on a Sphere** A body of mass \( m \) and negligible size starts from rest and slides down the surface of a frictionless solid sphere of radius \( R \). Prove that the body leaves the sphere when \( \theta = \cos^{-1}(2/3) \). **Diagram Explanation:** - The diagram shows a sphere with radius \( R \). - A small block is positioned at the top of the sphere and then depicted sliding down its surface. - The angle \( \theta \) is measured from the vertical centerline to the position of the block along the sphere's surface. - The point at which the block leaves the sphere is indicated by an arrow moving tangentially away from the sphere. This scenario is analyzed to find the angle \( \theta \) at which the normal force between the block and the sphere becomes zero. At this angle, the body loses contact and leaves the sphere’s surface.
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