Two technicians are discussing valve body checks. Technician A says a test for a sticky valve is to make sure that the all valves will free fall out of its bore. Technician B says that an aluminum valve can be checked by seeing how much side clearance it has by trying to wiggle it in its bore. Which technician is correct?a. Tech A
b. Tech B
c. Both A and B
d. Neither A nor B

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

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?

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.