In the Figure,the Horizontal Lower Arm Has a Mass of 2.8

question 8

Multiple Choice

In the figure,the horizontal lower arm has a mass of 2.8 kg and its center of gravity is 12 cm from the elbow joint pivot.How much force F_M must the vertical extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put?

• A) 100 N
• B) 500 N
• C) 750 N
• D) 1000 N
• E) 1500 N

---

Definitions:

Learning And Memory

The processes by which we acquire new information (learning) and store that information over time (memory).

Acetylcholine

A neurotransmitter in both the central and peripheral nervous systems that plays a significant role in muscle activation, memory formation, and learning.

Neurotransmitter

Chemical messengers that transmit signals across synapses between neurons in the brain.

Acetylcholine

A neurotransmitter in both the central and peripheral nervous systems that plays an important role in muscle contraction and the regulation of activities in the brain.