The problem involves a man with a mass of 70 kg sitting on a chair weighing 10 kg, who is attempting to pull himself upwards with an acceleration of 0.2 m/s². The objective is to determine the force required to achieve this acceleration, considering the effects of gravity.
The discussion is ongoing, with participants providing insights and corrections regarding the setup of the problem. There is recognition of the complexity introduced by the pulley system, and some guidance is offered about drawing a free body diagram to better understand the forces at play.
Participants are navigating assumptions about the system, including the role of gravity and the configuration of the pulley system. There is mention of potential issues with significant figures and arithmetic in the calculations presented.
One of these last 2 equations is correct (do you know which?) There might be a problem with the number of significant figures you gave in your answer, or you could have done the arithmetic wrong. Since you didn't say what answer you got, it's hard to tell.thedarkone80 said:Homework Statement
A man with an 70kg mass, sits on chair of 10kg, and pulls himself upwards at a acceleration of 0.2m/s^2. What is the force needed to achieve this acceleration?
Homework Equations
F=ma
The Attempt at a Solution
F=(80)*(9.81+0.2)
F=(80)*(9.81-0.2)
Neither are giving a correct answer, please help!
thedarkone80 said:no, he is pulling himself and the chair upwards, he is on a pully system. sorry for not being clear. appreciate the quick response though!