Oil Separates a 20-Mm-Diameter Rotating Shaft from Its 20

question 21

Multiple Choice

Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing
Surface is nearest:

• A) 6840 m/s/m
• B) 7260 m/s/m s
• C) 8040 m/s/m
• D) 9406 m/s/m

---

Definitions:

Resilience

The ability to recover quickly from difficulties or adapt to change effectively.

Obstacles

Refers to challenges or barriers that hinder progress towards a goal.

Grit

A personality trait characterized by perseverance and passion for long-term goals, often associated with resilience in overcoming obstacles.

Global Entrepreneurship Monitor

An international research initiative that assesses the state of entrepreneurship ecosystems in various countries around the world.