3.

Box A of mass 20-kg sits on a 15° The numeric equation for the normal force (N) of the ramp

ramp

on the box is: (fill in circle of single correct equation)

ON=20

A

GA

15°

ON=20 (9.81)

ON 20 (32.2)

N=20(9.81) (sin 15°)

N-20 (sin 15°)

N=20 (32.2) (sin 15°)

N=20 (9.81) (cos 15°)

N=20 (cos 15°)

ON 20 (32.2) (cos 15°)

ON

20 (9.81)/(cos 15°)

ON

20 (32.2)/(sin 15°)