Using the knowledge that you gained from Chapter 7, “Mechanical Comprehension,” choose one answer.
|81.||A man is using 60 lbs. of effort to lift a 240 lb. crate. What is the mechanical advantage in this situation?
|82.||How much work does a 5 hp engine do per minute?
|83.||What force must you exert (vertically) on the handles of a wheelbarrow 4 feet from the axle of the wheel in order to lift a weight of 250 lbs. that is concentrated at a point 2 feet from the axle?
|84.||What is the pressure, in psi, of a tank of water that measures 8 feet square by 14 feet ...|