- #1
DrunkApple
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Homework Statement
In a stage production of Peter Pan, the 63 kg
actress playing Peter has to fly in vertically,
and to be in time with the music, she must
be lowered, starting from rest, a distance of
2.6 m in 2.2 s. Backstage, a smooth surface
sloped at 58 supports a counterweight of mass
m. What is the mass of the counterweight that
must be used? The pulley is of negligible mass
and is frictionless. The acceleration of gravity
is 9.81 m/s2 .
Homework Equations
y-y0 = Vot + 0.5at^2
m1a = T - m1gsin 58
m2a = m2g - T
The Attempt at a Solution
I already got the answer.
a= 1.07438 m/s^2
m1=58.57211916 kg
My question is, why is y - y0 positive? Should it not be negative since Peter Pan is lowered, making y < y0 which y0 = 2.6?? If I make y - y0 = -2.6, then I do not get correct value of the mass.