Circle the right answers.

I. A wheel rolls without slipping along a horizontal surface. The center of the wheel has a translation velocity of +v. The lowest point on the wheel has a velocity of

A. +v

B. -v

C. 0

D. -2v

E. +2v             Ans. C

II. A ladder of weight W resting on a frictionless wall as shown in the diagram. Which arrow best represent the direction of the reaction from the floor?

A. A

B. B

C. C

D. D

E. E                   Ans. D
 
 
 

III. In the figure below, five forces act on a massless rod free to pivot at point P. Which force is producing a zero torque about point P?

A. A

B. B

C. C

D. D

E. E                    Ans. A

IV. One kilogram of Lead (density ~11.3 gm/cm³), one kilogram of Iron (density~7.8 gm/cm³), and one kilogram of Aluminum (density~2.7 gm/cm³) are dropped into a pool, which has the largest buoyant force on it?

A. Lead

B. Iron

C. Aluminum

D. All are the same

E. Depends on the shape of the objects                    Ans. C