The diagram shows a 1-newton metal disk resting on an index card that is balanced on top of a glass.
1 answer:
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Answer:
Explanation:
The energy lost due to air friction is equal to the mechanical energy lost by the parachutist during the fall.
The initial mechanical energy of the parachutist (at the top) is equal to his gravitational potential energy:
where
m = 20.1 kg is his mass
is the acceleration due to gravity
h = 662 m is the initial heigth
The final mechanical energy (at the bottom) is equal to his kinetic energy:
where
v = 7.12 m/s is the final speed of the parachutist
Therefore, the energy lost due to air friction is: