ect a HW6C 2017 ttps://session masteringphy com/myct/itemview? assignment Proble

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ect a HW6C 2017 ttps://session masteringphy com/myct/itemview? assignment ProblemID: 73525940 Ch 6 Dynamic Chrome lative X home"/tab/active Physics HW 6.45 6C 231-02 Google l physics: Problem l secure Mastering inter https//portalmypearson.com/course MasteringPhys X Course Home X Signed in as Kamal Ali Help Close Resources previous l 5 of 5 l return to assignment Problem 6.45 Part A If the coefficient of kinetic friction between the box and the roof is 0.55, with what speed should you push the box to have it come to rest right at the edge of the roof? You and your friend Peter are putting new shingles on a roof pitched at 23 You're sitting on the very top of the roof when Peter who is at the edge of Express your answer to two significant figures and include the appropriate units. the roof directly below you, 5.5 m away, asks you for the box of nails. Rather than carry the 2.1 kg box of nails down te Peter, you decide to give the box a push and have it slide down to him. Value Units Submit My Answers Give Up Incorrect; Try Again; 3 attempts remaining Continue

Explanation / Answer

Let the speed be v, by energy conservation

0.5 mv^2 + mg sin theta x - umg cos theta x =0

v = sqrt(2*0.55*9.8* cos 23 degree - 2*9.8*sin 23 degree)

= 1.5 m/s

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