what is the mechanical advantage of using the ramp, as opposed to lifting the gurney straight up? (ignore any effects of friction.)

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

In a system, when potential energy decreases, then entropy also decreases. true false

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.