1. For each statement fill in the blank with "positive", "negative", or "zero". a. The change in gravitational potential energy when a box slides a distance /x on a horizontal table is positive b. The change in potential energy of a spring when it is being compressed is Xnegative. c. The change in potential energy of a spring when it is being extended is positive - 3 d. The change in gravitational potential energy of a box being lifted is Xnegative. e. The net work on an object moving with constant velocity is Zero f. When a mass is launched by the release of a compressed spring the work done on the mass is Zero 2. A uniform disk, a uniform hoop, and a uniform solid sphere are released at the same time at the top of an inclined ramp. They all roll without slipping and they all have the same worn total mass. 80 a. Rank their gravitational potential energies at the top of the ramp. If any are the op = mrZ same state that explicitly. mg y f = PE9 232 = 215 mr all be the same, all variables in equation are In what order do they reach the bottom of the ramp? If any arrive together state the Same K = 1/ 2 mr 2 that explicitly. sphere , disk , hoop c. Rank their total kinetic energies at the bottom of the ramp. If any are the same, state that explicitly. total Ke = 1/ZIwz + 1/2 my 2 hoop disc ? - 1 Sphere d. Rank their translational kinetic energies at the bottom of the ramp. If any are the same, state that explicitly. KT = / 2my 2 hoop, disc, sphere e. Rank their rotational kinetic energies at the bottom of the ramp. If any are the same, state that explicitly. Ker = V2Iwz sphere, disk, hetop