Print Calculator Periodic Table Question of 14 Sapling Learning A a kg barbell f

Question

Print Calculator Periodic Table Question of 14 Sapling Learning A a kg barbell from his chest to a height equal the length of his arms 0850 m. How much work does he do? Number What is the potential energy of the barbell relative to the weightiner's chest after he lifts the barbell? Number the useithe does thislin 35 times? Assumethe weightiner does no Work in l ng the barbell drop back to his chest. Cal Previous 8 G up s view soktion Check Answer ONext Exit a a Due Date: Points Possible: Grade Category: Description: Policies: You can check you You can view salut You have five atte There is no penalt O eTextbook OHelp with This O Web Help & Vid O Technical supp

Explanation / Answer

a)

W=F*d*cos

W=mg*h*cos

W=180*9.8*0.850*cos180

W= -1499.4 J

b)

PE = -W

PE = -(-1499.6)

PE = 1499.6 J

c)

Wnet = 35*W = 35*1499.6 J = 52486 J

1 calorie = 4.184 J

52486 J = 52486/4.184 = 12544 calories

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