1. Cathy, a 460 N actress playing Peter Pan, is hoisted above stage in order to “fly” by a stagehand pulling with a force of 60 N on a rope wrapped around a pulley system. What is the Mechanical Advantage of the pulley system?
2. A windmill uses sails blown by the wind to turn an axle that allows a grindstone to grind corn into
meal with a force of 90 N. The windmill has sailsof radius 6.0 m blown by a wind that exerts a force
of 15 N on the sails, and the acle of the grindstone has a radius of 0.50 m.
a)What is the Ideal Mechanical Advantage of the wheel?
b)What is the actual Mechanical Advantage of the wheel?
c)What is the efficiency of the wheel?
3. Mr. Macintoch, a computer technician, uses a screwdriver with a handle of radius 1.2 cm to remove a screw in the back of a computer. The screw moves out 0.20 cm to each complete turn. What is the Ideal Mechanical Advantage of the screwdriver?
4. A nutcracker 16 cm long is used to crack open a Brazil nut that is placed 12 cm from where your hand is squeezing the nutcraker. What is the Ideal Mechanical Advantage of the nutcracker?