Answer to Question #270606 in Physics for Kai

Question

In a charming 19th-century hotel, an old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 1.24m in diameter. The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim of the disk but turns with it. Through how many revolutions has the disk turned when it has raised the elevator 3.3m between floors?

Answer 1

$s=\phi r\to\phi=s/r=3.3/0.62=5.32\ (rad)$

$5.32/(2\pi)=0.85$ revolutions. Answer