Two masses, ma = 34.0 kg and mb = 40.0 kg , are connected by a rope that hangs over a pulley (as in the figure (figure the center of the pulley is hollowed out so that you may assume all the mass of the pulley is in the rim. the radius of the pulley is 0.381 m and the mass of the pulley is 3.10 kg . initially ma is on the ground and mb rests 2.50 m above the ground. g = 9.81 m/s2 .if the system is released, use conservation of energy to determine the speed of mb just before it strikes the ground. assume the pulley bearing is frictionless.

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work