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islanderman7
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Homework Statement
A skier of mass 67 kg is pulled up a slope by a motor-driven cable.
(a) How much work is required to pull him 40 m up a 30° slope (assumed frictionless) at a constant speed of 1.7 m/s?
m= 67kg
Delta y= 40m
Theta= 30 degrees
v= 1.7m/s
Homework Equations
I know that:
F=ma
W= F cos(Theta) (Delta y)
The Attempt at a Solution
I am solving for the force:
F=ma
F= 67 (1.7)
F= 113.9 N/m
With F solved I use my Work Equation:
W= F cos(Theta)(Delta y)
W= 113.9 (cos30) (40)
W= 3945.61 J
W= 3900 J
My answer differs from the correct answer by 10% to 100%
What am I doing wrong? Am I using the wrong equations?