|Mar1-10, 07:26 PM||#1|
Chris the inventive
An inventive child named Chris wants to reach
an apple in a tree without climbing the tree.
Sitting in a chair connected to a rope that
passes over a frictionless pulley, Chris pulls
on the loose end of the rope with such a force
that the spring scale reads 272.5 N. Chrisís
true weight is 464 N, and the chair weighs
The acceleration of gravity is g = 9.8 m/s2 .
A. Find the magnitude of the acceleration of
Answer in units of m/s2.
Find the magnitude of the force Chris exerts
on the chair.
Answer in units of N.
i got the acelleration and it was marked correct (0.258380414312617702)
but when i look for the force which i used f=ma.... it was marked wrong... i tried first in N than in kg and still nothing...
|Mar1-10, 10:07 PM||#2|
Chair is going up with an acceleration a. Weight of Chris acts in down ward direction. So net reaction on the chair is F = m(a+g)
|Mar1-10, 10:22 PM||#3|
ok would i use the mass of the chair only or include the kids too?
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