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13 Dec 2019

When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky dicer is 915 newtona and the drag force has a magnitude of 1027 newtons. The mass of the sky diver is 93.4kg. What are the magnitudee and direction of his acceleration?

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16 Dec 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A 75.7kg man steps off a platform 3.09m above the ground. He keepshis legs straight as he falls, but at the moment his feet touch theground his knees begin to bend, and, treated as a particle, hemoves an additional 0.650m before coming to rest.

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A skydiver of mass 80.0 kg (including parachute) jumps off a plane and begins her descent. Throughout this problem use 9.80 m/s2 for the magnitude of the acceleration due to gravity.
 
(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=Kv2
 
where the coefficient K depends on the shape and size of the falling object and on the density of air. For a human body, the numerical value for K is about 0.250 kg/m .
 
Using this value for K, what is the terminal speed vterminal of the skydiver?
 
(C) When the skydiver descends to a certain height above the ground, she deploys her parachute to ensure a safe landing. Usually, the parachute is deployed when the skydiver reaches an altitude of about 900 m (3000 ft). Immediately after deploying the parachute, does the skydiver have a nonzero acceleration?
 
(D) When the parachute is fully open, the effective drag coefficient of the skydiver plus the parachute increases to 60.0 kg/m. What is the drag force Fdrag acting on the skydiver immediately after she has opened the parachute?
 
(E) What is the terminal speed vterminal of the skydiver when the parachute is opened?

A 72.1 man steps off a platform 3.05 above the ground. He keeps hislegs straight as he falls, but at the moment his feet touch theground his knees begin to bend, and, treated as a particle, hemoves an additional 0.640 before coming to rest.

What is his speed at the instant his feet touch the ground?
I have this answer as 7.73 m/s.

Treating him as a particle, what is the magnitude of hisacceleration as he slows down if the acceleration isconstant?
46.7 m/s squared

Treating him as a particle, what is the direction of hisacceleration as he slows down if the acceleration isconstant?
upward

*I am having trouble with the rest of these.

Draw a free-body diagram of this man as he is slowing down.


Use Newton's laws and the results of part B to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce in newtons.


Use Newton's laws and the results of part to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce as a multiple of the man's weight.

What is the magnitude of the reaction force to the force you foundin part E?

What is the direction of the reaction force to the force you foundin part E?
upward or downward

I would really appreciate help with this problem. I don'tunderstand the last parts at all.

Thanks!

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