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The image contains two main problems. Let's break down the visible mathematical content step-by-step:

### Problem 1:
This involves determining the reaction force at point \( C \) for the given structure, and you are provided with multiple-choice options.

### Problem 2:
This is a problem regarding the maximum shear stress calculation in a shaft. The parameters include a given diameter and load conditions.

To solve these problems:

1. **Problem 1 (Beam and Reaction Forces):**
   - Use principles of statics. For example, apply equilibrium equations such as:
     \[
     \sum F_y = 0 \quad \text{and} \quad \sum M = 0
     \]
   - Identify all forces acting on the beam (including reaction forces and applied loads).
   - Sum moments about point \( A \) or \( B \) to solve for the reaction at \( C \).

2. **Problem 2 (Shear Stress in a Shaft):**
   - Use the formula for shear stress in circular shafts:
     \[
     \tau_{\text{max}} = \frac{T r}{J}
     \]
     where \( T \) is the torque, \( r \) is the radius, and \( J \) is the polar moment of inertia.
   - Polar moment of inertia for a circular section is given by:
     \[
     J = \frac{\pi d^4}{32}
     \]
     where \( d \) is the diameter of the shaft.

Would you like me to solve each problem step-by-step or explain any specific parts in detail?

Determine the reaction force at point C and calculate the maximum shear stress in a shaft given a diameter and load.

Solve a statics problem involving reaction forces at point C and calculate the maximum shear stress in a circular shaft with a given diameter. Learn key concepts from structural analysis and material mechanics.

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