problem07_48

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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7.48: (a) m 3 . 9 ) s m 8 . 9 ( 40 sin 40 cos ) s m 8 . 9 )( 20 . 0 ( ) s m 15 ( 2 1 sin cos 2 1 sin cos 2 1 2 2 2 k 2 0 k 2 0 Top f Bottom = = ° ° - = - = = - = + h h h gh h g v h d mgh d θ mg mv PE W KE θ θ μ θ μ (b) Compare maximum static friction force to the weight component down the plane. s 2 2 s s N 176 ) 40 )(sin s m kg)(9.8 28 ( sin N 158 40 cos ) s m kg)(9.8 28 )( 75 . 0 ( cos f mg mg f = ° = = ° = = θ θ μ so the rock will slide down.
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Unformatted text preview: (c) Use same procedure as (a), with m 3 . 9 = h s m 11.8 sin cos 2 2 2 1 sin cos k B 2 B k Bottom f Top =-= =-= + gh gh v mv h mg mgh KE W PE...
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