The crane is lifting a 180 kg crate upward with an acceleration of 1.2 m/s2. The cable from the crate passes over a solid cylindrical pulley at the top of the boom. The pulley has a mass of 130 kg. The cable is then wound onto a hollow cylindrical drum that is mounted on the deck of the crane. The mass of the drum is 150 kg, and its radius is 0.76 m. The engine applies a counterclockwise torque to the drum in order to wind up the cable. What is the magnitude of this torque? Ignore the mass of the cable.
2007-11-16 08:38:19 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Not only do you need the radius of the pulley, you need to know the friction of the pulley and the drum. You can simplify if you are permitted to disregard friction. There are two components of the force on the cable: the static load due to the wt and the force due to acceleration, F=ma. good luck.
2007-11-16 12:14:54 · answer #1 · answered by Gary H 7 · 0⤊ 0⤋