Which kind of simple machine is the beater part of a mixer?

Options

A. pulley
B. wheel-and-axle
C. pulley and lever
D. two pulleys

Explanation

To determine what kind of simple machine the beater part of a mixer is, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of the Beater**:
- The beater part of a mixer consists of a vertical axle and a rotating wheel.

2. **Understand the Functionality**:
- The beater rotates around the axle, which helps in mixing ingredients effectively.

3. **Classify the Simple Machine**:
- The combination of a wheel (the rotating part) and an axle (the central rod) is classified as a "wheel and axle" simple machine.

4. **Conclude the Answer**:
- Therefore, the beater part of a mixer is a type of simple machine known as a "wheel and axle".

### Final Answer:
The beater part of a mixer is a **wheel and axle**.

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