4. A parachutist of mass 60 kg leaves a plane and begins her descent towards the earth. (a) What are all the forces acting on her as she falls? (b) At a given instant during her fall, she has a downward acceleration of 2.45 m/s$^2$. At this instant, what is the magnitude of the force of air resistance on her? (c) When she reaches terminal velocity, what is the net force acting on her?
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A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of $55.0 \mathrm{kg},$ and air resistance exerts a total upward force of 620 $\mathrm{N}$ on her and her parachute. (a) What is the weight of the parachutist? (b) Draw a free-body diagram for the parachutist (see Section 4.6 ). Use that diagram to calculate the net force on the parachutist. Is the net force upward or downward? (c) What is the acceleration (magnitude and direction) of the parachutist?
A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 55.0 $\mathrm{kg}$ , and at a particular moment air resistance exerts a total upward force of 620 $\mathrm{N}$ on her and her parachute. (a) What is the weight of the parachutist? $(\mathrm{b})$ Draw a free-body diagram for the parachutist (see Section $4.6 ) .$ Use that diagram to calculate the net force on the parachutist. Is the net force upward or downward? (c) What is the acceleration (magnitude and direction) of the parachutist?
A parachutist of mass 70 kg jumps out of an airplane and eventually reaches a constant terminal speed of 80 m/s. When this happens, what is the magnitude of the upward-pointing drag force on the parachutist? (Hint: First find the acceleration and the net force on the parachutist.) a. 80 N b. 140 N c. 150 N d. 600 N e. 700 N
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