Question
Show that nearly $786 \mathrm{~W}$ of power is expended when a $500-\mathrm{N}$ barbell is lifted $2.2 \mathrm{~m}$ above the floor in $1.4 \mathrm{~s}$.
Step 1
Work done (W) = Force (F) × Distance (d) W = 500 N × 2.2 m W = 1100 J (Joules) Show more…
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Show that about 786 $\mathrm{W}$ of power is expended when a 500 -N barbell is lifted 2.2 $\mathrm{m}$ above the floor in 1.4 $\mathrm{s}$ .
Calculate the work done in lifting a $500-\mathrm{N}$ barbell 2.2 $\mathrm{m}$ above the floor. (What is the gain of potential energy of the barbell when it is lifted to this height?)
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