e c LON-CAPA Lifting BricksChegg Study Guided Salutio x secure https: capa8.phy
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e c LON-CAPA Lifting BricksChegg Study Guided Salutio x secure https: capa8.phy ohi.edu/esfsu/openstax-CollegePhysics 07 wor EnergyPower 36 Power problem?symb-uploaded %2tohiou%2f91391804150295a49oucapa2962fdefa. Megan Michalak(Student- section: 101) Physics 2001/Spring 2018 l Messages Courses Help Logout Main Menu Contents Grades Course Contents» * Assignment 8 Lifting Bricks Timer Notes . Evaluate-Feedback-Mint Oil Lifting Bricks Due in 12 hours, 8 minut What is the average useful power output of a person who does 6.60x106 J of useful work in 9.20 h? Submit Answr Tries 0/10 Working at this rate, how long will it take this person to lift 1700 kg of bricks 1.40 m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.) Submit Answer Tries 0/10 This discussion is closed Send FeedbackExplanation / Answer
here,
a)
work done , W = 6.6 * 10^6 J
time taken , t = 9.2 h = 9.2 * 3600 s
the power output , P = W/t
P = 199.3 W
b)
the time taken , t = change in potential energy /power
t = 1700 * 9.81 * 1.4 /199.3 s
t = 117.1 s
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