What is the potential energy of a 20-kg safe sitting on a shelf 0.5 meters above the ground?
O A. 98 J
B. 10 J
O C. 20 J
D. 196 J
Please help me I’ll give you BRAINLIEST

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)