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MCQ 4. 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 NL; the normal force of the ramp on the second box is NR. Which statement is correct? a. NR = NI ma

MCQ 4. 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 NL; the normal force of the ramp on the second box is NR. Which statement is correct? a. NR = NI ma

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MCQ 4. 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 NL; the normal force of the ramp on the second box is NR. Which statement is correct? a. NR= NL = mg. b. N₁ mg; NR= mg sin 20°. C. NL = mg; NR = mg cos 20°. d. Nr.= mg; NR= -mg cos 20°. e. NR=-NL = -mg.
Transcribed Image Text:MCQ 4. 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 NL; the normal force of the ramp on the second box is NR. Which statement is correct? a. NR= NL = mg. b. N₁ mg; NR= mg sin 20°. C. NL = mg; NR = mg cos 20°. d. Nr.= mg; NR= -mg cos 20°. e. NR=-NL = -mg.
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