A metal bar `70 cm` long and `4.00 kg` in mass is supported on two knife edges placed `10 cm` from each end. A `6.00 kg` weight is suspended at `30 cm` from one end. Find the reactions at the knife edges. Assume the bar to be of uniform cross-section and homogeneous.

Explanation

To solve the problem of finding the reactions at the knife edges supporting a metal bar with a suspended weight, we can follow these steps:

### Step 1: Understand the Setup
- The metal bar is 70 cm long and has a mass of 4.00 kg.
- The knife edges are placed 10 cm from each end of the bar.
- A 6.00 kg weight is suspended at a distance of 30 cm from one end of the bar.

### Step 2: Identify Forces Acting on the System
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