A 90 kg mail bag hangs

A classic physics problem!

A 90 kg mail bag hangs from a rope or a hook. We can analyze this situation using the concept of weight and gravity.

Weight: The weight of the mail bag is the force exerted on it by gravity. Since the mail bag is on the surface of the Earth, the weight is equal to the product of its mass and the acceleration due to gravity (g). The acceleration due to gravity is approximately 9.8 m/s² on Earth.

Weight (W) = mass (m) × acceleration due to gravity (g) = 90 kg × 9.8 m/s² = 882 N (Newtons)

Force: The force exerted by the rope or hook on the mail bag is equal to the weight of the mail bag. This is because the rope or hook is providing the necessary support to keep the mail bag from falling.

Force (F) = weight (W) = 882 N

Tension: The tension in the rope or hook is also equal to the weight of the mail bag, since the rope or hook is providing the necessary force to support the weight.

Tension (T) = force (F) = 882 N

So, the 90 kg mail bag hanging from a rope or hook experiences a weight of 882 N, and the rope or hook exerts a force of 882 N to support the weight.