A 20-Kg Block Slides Down a Fixed, Rough Curved Track

question 28

Multiple Choice

A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?

• A) −14 J
• B) −12 J
• C) −10 J
• D) −16 J
• E) −25 J

---

Definitions:

Basilica

In Roman architecture, a public building for legal and other civic proceedings, rectangular in plan, with an entrance usually on a long side. In Christian architecture, a church somewhat resembling the Roman basilica, usually entered from one end and with an apse at the other.

Domus

A Roman private house.

Severus and Celer

Architects believed to be responsible for the design and construction of Nero's Golden House (Domus Aurea) in Rome, showcasing innovative Roman architecture and engineering.

Great Fire

A large and destructive fire that has occurred in various historical contexts, often resulting in significant loss of life, property, and cultural heritage.