What is the Magnitude of Average Force Due to Air Resistance?

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Homework Help Overview

The discussion revolves around a physics problem involving projectile motion and air resistance. The original poster presents a scenario where a projectile is launched vertically, and the task is to determine the average force due to air resistance based on its maximum height.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss applying Newton's second law and kinematic equations to find acceleration and time. There are attempts to set up equations based on the motion of the projectile, but some participants express confusion regarding the relationship between variables.

Discussion Status

The discussion is ongoing, with some participants providing equations and approaches while others seek clarification on the methods presented. There is no explicit consensus, but guidance has been offered regarding the use of systems of equations to solve for unknowns.

Contextual Notes

Participants note the challenge of finding time when it is not directly given, indicating a potential gap in information or understanding of the problem setup.

IShouldBSurfing
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Hello ! Wow, you guys are awesome, Thanks for all the help ! I've got another one I'm stuck on - ... I got part A.. the answer is 42.9082, but I can't get part B... ? help pleaaseee? thaaanks

A projectile of mass 1.100 kg is shot straight up with an initial speed of 29.0 m/s.
(a) How high would it go if there were no air friction?
m
(b) If the projectile rises to a maximum height of only 35.2 m, determine the magnitude of the average force due to air resistance.
N
 
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Use the second law of Newton: You would have -mg - Fr = ma

similarly, by the kinematic equations, you can find aceleration by using a system of equations: v = v0 + at and x = x0 + v0t + (1/2)at^2

in the first, v is o since at the top the velocity is o, you really have two equations with two uknownsl; t and a.

once you have "a" you can use -mg - Fr = ma or Fr = mg-ma

Hope i was some help here. (tell me if i did something wrong, i make mistakes sometimes)
 
hm.. i didn't really understand what u said at all.. how am i supposed to find a when i don't know t ? ah, confused
 
its a system of equations that gets you t and a. The systems are
-29 = at
35.2 = 29t + (1/2)at^2
these two help you solve for a AND t (not that you need t)
does that help?
 

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