Problem 2. To prevent a box from sliding down an inclined plane, student A pushes on the box in the direction parallel to the incline, just hard enough to hold the box stationary. In an identical situation, student B pushes on the box horizontally. If the weight of the box w= 220. N, the angle made by the incline with the horizontale=25, and the coefficient of static friction us=0.16, who has the easier job? Show your solution.

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Q: 9.) A springboard diver of weight 582 N stands at one end of a uniform 4.48 m diving board of weight…

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Q: 3. Knowing that a = 60°, determine the resultant couple moment. 120 N 960 N 100 mm 120 N D

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Q: Prob. 4.6-6. As illustrated in Fig. P4.6-6, a composite shaft of length L is made by shrink-fitting…

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Q: Constants A 0.145-kg baseball pitched horizontally at 33.1 m/s strikes a bat and is popped straight…

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A: Given: α=30oγ=20oθ=60oμB=0.22μc=0.11μD=0.05p=72.34 NWA=103.45 Ng=9.81 m/s2β=θ+γβ=60+20=80o

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”