Determine the maximum hauling production given the following conditions. as many scrapers as required can be used, but only one push tractor will be available. the material is a sandy clay (dry earth), 3,200 lb/bcy. the expected haul-road rolling resistance is 80 lb/ton. the average scraper load will be 28.2 lcy. the haul route has three segments: 700 ft at a grade of + 5%; 2,500 ft at + 2% grade; and 500 ft at - 2% grade (moving from the cut to the fill). to account for acceleration and deceleration, use an average speed of 5 mph for 200 ft at each end of the haul and

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Which accurately compares concave and convex lenses?

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g