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# (II) (a) What is the acceleration of two falling sky ISBN: 9780130606204 3

## Solution for problem 17P Chapter 4

Physics: Principles with Applications | 6th Edition

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Problem 17P

Problem

(II) (a) What is the acceleration of two falling sky divers (total mass = 132 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight? (b) After opening the parachute, the divers descend leisurely to the ground at constant speed. What now is the force of air resistance on the sky divers and their parachute? See Fig. 4-44. Step-by-Step Solution:

Solution 17P: The force (friction) due to air is responsible of lowering the net force due to gravity and with the help of parachute the skydivers can be brought safely on the ground. Step 1 of 3 Concept: Newton’s second law: The force F acts on mass m produces an acceleration a in the object. Mathematically, F=ma. Step 2 of 3 A] When parachute was not opened Figure below shows the free body diagram of the two falling sky divers falling vertically downward under gravity. T Upward air resistance mg Combined weight of two divers and parachute due to gravity Since upward force due to air resistance is equal to one-fourth of their combined weight, mg therefore, T = 4 132×9.8 T = 4 T = 323.4 N Therefore, force due to the upward air resistance is T = 323.4 N.

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Step 4 of 4

##### ISBN: 9780130606204

This full solution covers the following key subjects: parachute, divers, air, resistance, sky. This expansive textbook survival guide covers 35 chapters, and 3914 solutions. The full step-by-step solution to problem: 17P from chapter: 4 was answered by , our top Physics solution expert on 03/03/17, 03:53PM. Since the solution to 17P from 4 chapter was answered, more than 1682 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Physics: Principles with Applications, edition: 6. Physics: Principles with Applications was written by and is associated to the ISBN: 9780130606204. The answer to “(II) (a) What is the acceleration of two falling sky divers (total mass = 132 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight? (b) After opening the parachute, the divers descend leisurely to the ground at constant speed. What now is the force of air resistance on the sky divers and their parachute? See Fig. 4-44.” is broken down into a number of easy to follow steps, and 65 words.

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