EIT Statics and Dynamics 2

Question 1

What is the moment of inertia of a solid cylinder (mass M, radius R) about its central axis?

Accepted Answer

½MR²

Answer

The moment of inertia of a solid cylinder about its axis of symmetry is I = ½MR².

Question 2

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

Accepted Answer

Horizontal component

Answer

With no air resistance, only gravity acts, and it acts vertically — so the horizontal velocity component remains constant throughout.

Question 3

The coefficient of restitution e = 1 describes:

Accepted Answer

A perfectly elastic collision

Answer

A coefficient of restitution of 1 indicates a perfectly elastic collision where kinetic energy is fully conserved.

Question 4

For a free-body diagram, which of the following should be included?

Accepted Answer

All external forces and moments acting on the body

Answer

A free-body diagram includes all external forces and moments acting on the isolated body, revealing what affects its motion.

Question 5

What is the angular momentum of a 2 kg mass rotating at 5 rad/s with a radius of 0.4 m?

Accepted Answer

1.6 kg·m²/s

Answer

L = Iω = mr²ω = 2 × (0.4)² × 5 = 2 × 0.16 × 5 = 1.6 kg·m²/s.

EIT - Engineering in Training Practice Test