Answer :
1. **Refrigerator:** Net force of 3200 N (rightwards), mass 115 kg, acceleration ≈ 27.83 m/s² (rightwards), normal force ≈ 1128 N (upwards).
2. **Lifting beam:** Acceleration 0.1 m/s², mass 130 kg, force exerted by one man ≈ 6.5 N.
3. **Jaune and Corgi statue:** Acceleration -0.3 m/s² (downwards), mass 75 kg, Jaune's force ≈ -22.5 N (opposing acceleration).
1. **Refrigerator:**
- **Net force:** Combine the forces with their directions: 1200 N (pulling) + 2000 N (pushing) = 3200 N (rightwards).
- **Mass:** 115 kg.
- **Acceleration:** Use Newton's second law: F = ma => a = F/m = 3200 N / 115 kg ≈ 27.83 m/s² (rightwards).
- **Normal force:** This force acts perpendicular to the motion and cancels out any vertical forces. Since the motion is horizontal, the normal force equals the weight of the refrigerator: 115 kg * 9.81 m/s² ≈ 1128 N.
2. **Lifting beam:**
- **Acceleration:** 0.1 m/s².
- **Mass:** 130 kg.
- **Total force:** Force = mass * acceleration. Since two men contribute equally, force exerted by one man = total force / 2.
- **Force by one man:** 130 kg * 0.1 m/s² / 2 ≈ 6.5 N.
3. **Jaune and the Corgi statue:**
- **Acceleration:** -0.3 m/s² (negative as it's downwards).
- **Mass:** 75 kg.
- **Force by Jaune:** Force = mass * acceleration.
- **Jaune's force:** 75 kg * (-0.3 m/s²) ≈ -22.5 N (negative as the force opposes the acceleration).
