Q1. A 0.50kg ball that is tied to the end of a 2.0m light cord is revolved in a horizontal plane with the cord making the 30° angle, with the vertical. If the cord can withstand a maximum tension of 9.70 N, what is the highest speed at which ball can move?

Q2. At a construction site, a 62.0 bucket of concrete hangs from a light (but strong) cable that passes over the light friction-free pulley and is linked to an 85.30 box on a horizontal roof .The cable pulls horizontally on the box, and a 50.30 bag of gravel rests on top of the box. The coefficients of friction between the box and roof are shown. The system is not moving. Find out the friction force on the bag of gravel.