Question
A 56-kg student runs at 4.2 m/s , grabs a hanging 10.0-m-long rope, and swings out over a lake (Figure 1) . He releases the rope when his velocity is zero.
What is the angle θ when he releases the rope?
What is the tension in the rope just before he releases it?
What is the maximum tension in the rope during the swing?
What is the angle θ when he releases the rope?
What is the tension in the rope just before he releases it?
What is the maximum tension in the rope during the swing?
Answers
bobpursley
find his KE when he grabs the rope.
then his max PE will equal the initial KE
draw the figure.
his mg is down, Tension is up. so Tension*cosTheta=mg solve for Theta
PE=initKE
mgh=1/2 mv^2 solve for h.
Max tension. At the bottom
tension=mg+mv^2/r
then his max PE will equal the initial KE
draw the figure.
his mg is down, Tension is up. so Tension*cosTheta=mg solve for Theta
PE=initKE
mgh=1/2 mv^2 solve for h.
Max tension. At the bottom
tension=mg+mv^2/r
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