Question

A skydiver of mass 80.0 kg (including parachute) jumps off a plane and begins her descent. (A). At some point during her free fall, the skydiver reaches her terminal speed. What is the magnitude of the drag force Fdrag due to air resistance that acts on the skydiver when she has reached terminal speed? (B). For an object falling through air at a high speed v, the drag force acting on it due to air resistance can be expressed as F = Kv^3 (not Kv^2 as in the homework!). For a human body, the numerical value for K is about K1 = 0.02 kg/s/m^2. Using this value for K, what is the terminal speed v1 of the skydiver? (C). When the parachute is fully open, the effective drag coefficient of the skydiver plus parachute increases to K2. If we want the skydiver to land at a speed no higher than 2 m/s, what should K2 be? (D). Using K2 you just found, what is the drag force Fdrag acting on the skydiver immediately after she has opened the parachute?

          A skydiver of mass 80.0 kg (including parachute) jumps off a plane and begins her descent.

(A). At some point during her free fall, the skydiver reaches her terminal speed. What is the magnitude of the drag force Fdrag due to air resistance that acts on the skydiver when she has reached terminal speed?

(B). For an object falling through air at a high speed v, the drag force acting on it due to air resistance can be expressed as F = Kv^3 (not Kv^2 as in the homework!). For a human body, the numerical value for K is about K1 = 0.02 kg/s/m^2. Using this value for K, what is the terminal speed v1 of the skydiver?

(C). When the parachute is fully open, the effective drag coefficient of the skydiver plus parachute increases to K2. If we want the skydiver to land at a speed no higher than 2 m/s, what should K2 be?

(D). Using K2 you just found, what is the drag force Fdrag acting on the skydiver immediately after she has opened the parachute?

Added by Jessica F.

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