The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes a 20° angle with the ground. The normal force of the level ground on the first box is ; the normal force of the ramp on the second box is . Which statement is correct?



A.

= = mg.

B.
= mg; = mg sin 20°.

C.
= mg; = mg cos 20°.

D.
= mg; = ?mg cos 20°.

E.
= ? = ?mg.


Answer: C

Physics & Space Science

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