A 30-Kg Mass Is Dropped from the Edge of a 50-M

question 27

Multiple Choice

A 3.0-kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero.The mass strikes the ground with a downward velocity of 25 m/s.Find the change in mechanical energy of the mass caused by air resistance between the point where it is dropped and the point where it strikes the ground?

• A)-0.46 kJ
• B)-0.53 kJ
• C)-0.61 kJ
• D)-0.38 kJ
• E)-0.81 kJ

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Definitions:

Bones

The hard, dense connective tissue forming the structure of the skeleton of vertebrates, providing support and protection.

True Ribs

True ribs are the top seven pairs of ribs that are directly attached to the sternum through costal cartilages, providing protection to the thoracic cavity.

Vertebrae

The individual bones making up the vertebral column (spine) in humans and other vertebrates.

Ribs

The long curved bones which form the rib cage, providing protection to the thoracic organs.