Statics-Chp3-Part1

When a particle is in equilibrium, the sum of forces acting on it equals ------- . (Choose the most appropriate answer)

• A constant

• A positive number

• Zero

• A negative number

For a frictionless pulley and cable, tensions in the cable (T1 and T2) are related as

• T1 > T2

• T1 = T2

• T1 < T2

Assuming you know the geometry of the ropes, in which system above can you NOT determine forces in the cables?

• A

• B

• C

Why?

• The weight is too heavy.

• The cables are too thin.

• There are more unknowns than equations.

• There are too few cables for a 1000 l b weight.

If a dot product of two non-zero vectors is 0, then the two vectors must be ------- to each other.

• Parallel (pointing in the same direction)

• Parallel (pointing in the opposite direction)

• Perpendicular

• Cannot be determined.

If a dot product of two non-zero vectors equals -1, then the vectors must be Fill in the blank to each other.

• Collinear but pointing in the opposite direction

• Perpendicular

• Cannot be determined.

The dot product can be used to find all of the following except

• sum of two vectors

• angle between two vectors

• component of a vector parallel to another line

• component of a vector perpendicular to another line

Find the dot product of the two vectors P and Q.

• -12 m²

• 12 m

• 12 m²

• 10 m²