What is the circumference of a circle with a diameter of 1.2 meters?

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The circumference of a circle with a diameter of 1.2 meters is calculated using the formula circumference = πd, resulting in approximately 3.77 meters. In the context of a cylinder rolling down a slope, the distance mass B is lifted is 10 meters, which is derived from the combined effects of the cylinder's movement and rotation. The discussion clarifies that the rope does not wind around the cylinder, simplifying the calculations. Understanding the relationship between the cylinder's descent and the lifting of mass B is essential for solving this problem.

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Cylinder A in following figure rolls 5m down the slope. What distance is mass B lifted?
( Ans. SB= 10 m )

pulley.jpg


circumference of circle = πd = (3.14)(1.2) = 3.77

Not sure what to do next. I tried Pythagoras theorem, although it's probably not needed.

Please help.
 
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So the rope winds around the cylinder while the cylinder is moving down the hill. Suppose the rope doesn't wind around the cylinder. By how much would B be lifted? By how much does the cylinder rotate after it rolls 5 m downhill? Add the two distances together and you get 10 m.
 
Thanks man. It makes perfect sense to me now.
 

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