A 40-Kg Mass on the End of a String Rotates in in a Circular

question 21

Multiple Choice

A 4.0-kg mass on the end of a string rotates in a circular motion on a horizontal frictionless table. The mass has a constant speed of 2.0 m/s and the radius of the circle is 0.80 m. What is the magnitude of the resultant force acting on the mass?

• A) 39 N
• B) 20 N
• C) 44 N
• D) 0 N
• E) 30 N

---

Definitions:

Ionic

Pertaining to ions or the chemical bonds formed through the electrical attraction between positively and negatively charged ions.

Amino

Refers to amino acids, the building blocks of proteins, characterized by the presence of both an amino group and a carboxyl group.

Carboxyl

A carboxyl group is a functional group consisting of a carbon atom double-bonded to an oxygen atom and also bonded to a hydroxyl group, symbolized as -COOH.

Sulfhydryl

A functional group consisting of a sulfur atom bonded to a hydrogen atom (-SH), important in the structure and function of proteins.