The sun is the primary gravitational force in the solar system because
a)it's mass and distance both increase gravitational force
b)it's nuclear energy is more powerful than any other in the solar system
c)it emits the most amount of heat at great distances
d)it's the most massive object in the solar system

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)