Explanation Write down the equation for total energy in lifting the piano. E = Δ K + Δ U (I) Here E is the total energy, Δ K is the change in kinetic energy and Δ U is the change in potential energy. As the speed is constant, Δ K = 0 Write the equation for change in potential energy. Δ U = m g ( y 2 − y 1 ) (II) Here m is the mass, g is the acceleration due to gravity, y 1 is the initial height and y 2 is the final height. Substitute (II) in (I) E = m g ( y 2 − y 1 ) (III) Write down the equation for net power as there are 3 work men. P net = n P η (IV) Here P net is the net power, η is the efficiency of the work men, n is the number of workers and P is the power of individual workers. Write down the equation for power. P net = E t (V) P net is the net power, E is the energy and t is the time Rewrite (V) in terms of t . t = E P net (VI) Conclusion: Substitute 3.5 k ⋅ N for m g and 25 m for y 2 − y 1 in (II) E = 3

Bundle: Principles of Physics: A Calculus-Based Text, 5th + WebAssign Printed Access Card for Serway/Jewett's Principles of Physics: A Calculus-Based Text, 5th Edition, Multi-Term

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ISBN: 9781133422013

Author: Raymond A. Serway; John W. Jewett

Publisher: Cengage Learning

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Time required to lift a piano.

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