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Introductory Physics Homework Help
Crane Lifting 186 kg Crate: Torque Calculation
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[QUOTE="PhyzicsOfHockey, post: 1277689, member: 64296"] [h2]Homework Statement [/h2] The crane shown in the drawing is lifting a 186-kg crate upward with an acceleration of 2.0 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. [h2]Homework Equations[/h2] torque= I*angular acceleration I= mr^2 angular accel= accel/r [h2]The Attempt at a Solution[/h2] I tried everything that i know angular accel= 2/.76 =2.6316 rad/s^2 I=150*.76^2= 86.64 torque= 86.64*2.6316= 228 N*m But this answer is wrong. I tried negitive and that's wrong. What am I doing wrong! lol. [/QUOTE]
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Crane Lifting 186 kg Crate: Torque Calculation
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