The First of Two Identical Boxes of Mass M Is

question 81

Multiple Choice

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.

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