ACES Bluebook - ESAS 1

For a system to be in equilibrium, the sum of external forces acting on the system must be

• zero

• equal to unity

• a maximum

• indeterminate

The mass moment of inertia of a cylinder about its central axis perpendicular to a circular cross section is

• directly proportional to its length

• directly proportional to its radius

• independent of its radius

• independent of its length

An airtight closed box of weight P is suspended from a spring balance. A bird of weight W is placed on the floor of the box, and the balance reads W + P. If the bird flies around the box at a constant elevation without accelerating, what is the balance reading?

• P + W

• P

• P - W

• P + 2W

The moment of inertia of the plane figure can be expressed in units of length to the

• fourth power

• first power

• third power

• fifth power

The vector which represents the sum of a group of force vectors is called the

• resultant

• force polygon

• magnitude

• sum

Which of the following is not a vector quantity?

• speed

• velocity

• acceleration

• momentum

A rigid body is subjected to three concurrent, coplanar forces. What is the minimum number of independent equations that are necessary to establish the equilibrium condition?

• 2

• 3

• 1

• 0

Where can a couple be moved on a rigid body to have an equivalent effect?

• anywhere on the rigid body

• along the line of action

• in a parallel plane

• along the perpendicular bisector joining the two original forces

How many degrees of freedom does a coin rolling on the ground have?

• 3

• 2

• 5

• 1

Which of the following statement is false?

• the coefficient of restitution can be less than zero

• the frictional force always acts to resist motion

• momentum is conserved during elastic collision

• the period of a simple pendulum is independent of the mass of the pendulum