4. A spiral staircase in a building is in the shape of a helix of radius 5 meters. Between two floors of the building, the stairs make one full revolution and climb by 4 meters. A person carries a bag of groceries up two floors. The combined mass of the person and groceries is 70 kg and the gravitational force is 70g downward, where g is the acceleration due to gravity. Calculate the work done by the person against gravity.

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4. A spiral staircase in a building is in the shape of a helix of radius 5 meters. Between
two floors of the building, the stairs make one full revolution and climb by 4 meters.
A person carries a bag of groceries up two floors. The combined mass of the person
and groceries is 70 kg and the gravitational force is 70g downward, where g is the
acceleration due to gravity. Calculate the work done by the person against gravity.
Transcribed Image Text:4. A spiral staircase in a building is in the shape of a helix of radius 5 meters. Between two floors of the building, the stairs make one full revolution and climb by 4 meters. A person carries a bag of groceries up two floors. The combined mass of the person and groceries is 70 kg and the gravitational force is 70g downward, where g is the acceleration due to gravity. Calculate the work done by the person against gravity.
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