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1- Jayden selects up a heavy barbell and
1. Lifts it to chest height
2. Holds it steady for 1 minute
3. Puts it gently back on the floor.
Rank the amounts of work Jayden performs during thesethree operations.
Label the quantities as W1, W2, and W3. Justify your ranking order.
Answer:
Ranking of the amounts of work Jayden performs during these three operations:
𝑾𝟑 = 𝑾𝟏 > 𝑾𝟐
1. While lifting the barbell to the chest, the force applied by Jayden is weight of barbell (mg)
upward and displacement is up to chest height (let h) is also upward, so 𝑤𝑜𝑟𝑑 𝑑𝑜𝑛𝑒 =
𝑓𝑜𝑟𝑐𝑒 ∗ 𝑑𝑖𝑠𝑝𝑙𝑎𝑐𝑒𝑚𝑒𝑛𝑡 = 𝒎𝒈𝒉
2. While holding it steady, the force applied by Jayden is weight of barbell (mg), but
displacement = 0, so 𝑤𝑜𝑟𝑑 𝑑𝑜𝑛𝑒 = 𝑓𝑜𝑟𝑐𝑒 ∗ 𝑑𝑖𝑠𝑝𝑙𝑎𝑐𝑒𝑚𝑒𝑛𝑡 = 𝟎
3. While putting it back gently on floor, again the force applied will be again weight of barbell
(mg) upward and displacement is h downward, so 𝑤𝑜𝑟𝑑 𝑑𝑜𝑛𝑒 = 𝑓𝑜𝑟𝑐𝑒 ∗ 𝑑𝑖𝑠𝑝𝑙𝑎𝑐𝑒𝑚𝑒𝑛𝑡 =
𝑚𝑔 ∗ (−ℎ) = −𝒎𝒈𝒉
Here, we have compared the magnitude of work, so order is:
𝑾𝟑 = 𝑾𝟏 > 𝑾𝟐
2-PART A
Estimate the ki...