A parachutist whose mass is 70 kg drops from a helicopter hovering 2500 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b₁ = 30 N-sec/m when the chute is closed and b₂ = 90 N-sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 15 m/sec, after how many seconds will the parachutist reach the ground? Assume that the acceleration due to gravity is 9.81 m/sec² The parachutist will reach the ground after (Round to two decimal places as needed.). seconds.

A parachutist whose mass is 70 kg drops from a helicopter hovering 2500 m above the ground and falls toward the ground under the influence of gravity. Assume that the force due to air resistance is proportional to the velocity of the parachutist, with the proportionality constant b₁ = 30 N-sec/m when the chute is closed and b₂ = 90 N-sec/m when the chute is open. If the chute does not open until the velocity of the parachutist reaches 15 m/sec, after how many seconds will the parachutist reach the ground? Assume that the acceleration due to gravity is 9.81 m/sec² The parachutist will reach the ground after (Round to two decimal places as needed.). seconds.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

Question

A parachutist whose mass is 70 kg drops from a helicopter hovering 2500 m above the ground and
falls toward the ground under the influence of gravity. Assume that the force due to air resistance is
proportional to the velocity of the parachutist, with the proportionality constant b₁ = 30 N-sec/m
when the chute is closed and b₂ = 90 N-sec/m when the chute is open. If the chute does not open
until the velocity of the parachutist reaches 15 m/sec, after how many seconds will the parachutist
reach the ground? Assume that the acceleration due to gravity is 9.81 m/sec².
-
The parachutist will reach the ground after
(Round to two decimal places as needed.)
*
seconds.

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Step 2: Finding the time taken by parachutist to reach 15m/s

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Step 3: Finding the distance travelled by him in that time

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Step 4: Finding the time taken by him to travel the remaining distance

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