A Solid Wood Door, 90

question 7

Multiple Choice

A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is ajar and at rest. A ball with a mass of 500 g is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. The ball rebounds with a speed of 16.0 m/s along the same line. What is the angular speed of the door after the collision?

• A) 0.127 rad/s
• B) 0.925 rad/s
• C) 1.14 rad/s
• D) 2.28 rad/s
• E) 4.57 rad/s

---

Definitions:

Brain

The complex organ located in the skull, responsible for controlling most functions of the body and mind, including thought, memory, emotion, and motor skills.

Transitional Sleep

A phase of sleep that serves as a bridge between wakefulness and deeper stages of sleep, often characterized by light sleep.

Newborns

Infants in the very first weeks of life, characterized by rapid physical growth and development.

Half-awake State

A mental state between fully awake and fully asleep, often associated with drowsiness or the onset of sleep.