Fundamentals of Engineering Statics and Dynamics 3

Question 1

Conservation of linear momentum applies when:

Accepted Answer

No external forces act on the system

Answer

Linear momentum is conserved when the net external force on the system is zero.

Question 2

What is the period of oscillation for a simple pendulum with length L on Earth (g = 9.81 m/s²)?

Accepted Answer

T = 2π√(L/g)

Answer

The period of a simple pendulum is T = 2π√(L/g), independent of mass and amplitude (for small oscillations).

Question 3

What is the moment of inertia of a solid cylinder of mass m and radius r about its central axis?

Accepted Answer

mr²/2

Answer

The moment of inertia of a solid cylinder about its central axis is I = mr²/2.

Question 4

In projectile motion (neglecting air resistance), which component of velocity remains constant?

Accepted Answer

Horizontal velocity

Answer

The horizontal velocity remains constant because there is no horizontal force (neglecting air resistance).

Question 5

What is the unit of angular momentum in the SI system?

Accepted Answer

kg·m²/s

Answer

Angular momentum L = Iω has units of kg·m² × rad/s = kg·m²/s.

Fundamentals of Engineering Practice Test