A Man Pulls a 100-N Crate Up a Frictionless 30 $\degree$

question 29

Multiple Choice

A man pulls a 100-N crate up a frictionless 30 $\degree$ slope 5 m high as shown. Assuming that the crate moves at constant speed, the work done by the man is:

• A) -500 J
• B) -250 J
• C) 0 J
• D) 250 J
• E) 500 J

---

Definitions:

Central Sulcus

A prominent groove on the surface of the brain, separating the frontal and parietal lobes.

Cerebrum

The largest part of the brain, responsible for voluntary muscular activity, vision, speech, taste, hearing, thought, and memory.

Cerebellar Cortex

The outer layer of the cerebellum, involved in the coordination of voluntary movements and balance.

Folia

Leaf-like folds in the cerebellum that increase its surface area for processing motor information and coordination.